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Physics

CAIE2024

0.01 0.02 0.03 0.04 t / s Fig. 6.3 The maximum energy stored in the capacitor is 0.041 J. (i) Show that the capacitance of C is 570μF. [2] (ii) Determine the resistance of R. resistance = ..................................................... Ω [3] [Total: 11] © UCLES 2024 (cid:300) (cid:300) (cid:207) (cid:224) (cid:266) (cid:189) (cid:190) (cid:250) (cid:288) (cid:219) (cid:180) (cid:288) (cid:237) (cid:272) (cid:200) (cid:258) (cid:245) (cid:226) (cid:207) (cid:256) (cid:298) (cid:263) (cid:197) (cid:177) (cid:266) (cid:241) (cid:222) (cid:194) (cid:252) (cid:264) (cid:182) (cid:273) (cid:258) (cid:296) (cid:215) (cid:258) 9702/43/O/N/24 [Turn over (cid:293)(cid:245)(cid:197)(cid:277)(cid:245)(cid:277)(cid:229)(cid:213)(cid:245)(cid:213)(cid:261)(cid:197)(cid:261)(cid:277)(cid:293)(cid:245)(cid:293)(cid:213) NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD PMT * 0000800000016 *

Question

Physics

Edexcel2024

A student is investigating circuits that include a filament bulb. The filament bulb is labelled ‘1.5 V, 0.50 W’. (a) Show that the resistance of the filament bulb when operating normally is about 5 Ω. (2) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. * (b) The student wishes to control the brightness of the filament bulb using a potentiometer. The student connects the circuit shown. The total resistance of the potentiometer is very much larger than the resistance of the filament bulb.

Question

Physics

Edexcel2024

A teacher demonstrates the electric field produced between two parallel metal plates. The plates are connected to a variable power supply, as shown. The power supply has a very large internal resistance and includes a voltmeter that indicates its output. parallel plates V (a) (i) Add to the diagram to show the electric field between the two plates. (3) (ii) Explain why the reading on the voltmeter indicates the e.m.f. of the power supply. (2) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. *P74468A01224* 

Question

Physics

Edexcel2024

Turn over PMT (c) The student connects the filament bulb in the circuit shown below. The capacitor is initially uncharged and has a capacitance of 1.2 F. The resistance of the filament bulb is 5 Ω.

Question

Physics

CAIE2024

0.01 0.02 0.03 0.04 t / s Fig. 6.3 The maximum energy stored in the capacitor is 0.041 J. (i) Show that the capacitance of C is 570μF. [2] (ii) Determine the resistance of R. resistance = ..................................................... Ω [3] [Total: 11] © UCLES 2024 (cid:300) (cid:300) (cid:207) (cid:223) (cid:266) (cid:288) (cid:190) (cid:250) (cid:288) (cid:211) (cid:180) (cid:286) (cid:237) (cid:291) (cid:200) (cid:296) (cid:245) (cid:228) (cid:207) (cid:237) (cid:298) (cid:267) (cid:197) (cid:232) (cid:266) (cid:227) (cid:222) (cid:292) (cid:249) (cid:285) (cid:182) (cid:242) (cid:258) (cid:300) (cid:215) (cid:258) 9702/41/O/N/24 [Turn over (cid:293)(cid:277)(cid:261)(cid:277)(cid:181)(cid:181)(cid:261)(cid:277)(cid:277)(cid:181)(cid:213)(cid:261)(cid:197)(cid:213)(cid:197)(cid:277)(cid:229)(cid:213) NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD PMT * 0000800000016 *

Question

Physics

Edexcel2024

P74468A 3 *P69442A02732* Turn over  Turn over PMT Electric circuits Waves and particle nature of light Potential difference Wave speed W v = f λ V = Q Speed of a transverse wave on a string Resistance T V v = R = μ I Intensity of radiation Electrical power and energy P P = VI I = A P = I 2R Power of a lens V 2 P = 1 R P = f W = VIt P = P + P + P + …

Question

Physics

CAIE2024

(a) State what is meant by the frequency of an alternating current. ................................................................................................................................................... ............................................................................................................................................. [1] (b) An alternating current I in a resistor of resistance 680 Ω varies with time t according to I = 3.5 sin (40πt) where I is in A and t is in s. (i) Show that the period of the alternating current is 50 ms. [1] (ii) On Fig. 8.1, sketch the variation of I with t between t = 0 and t = 100 ms.

Question

Physics

CAIE2023

A battery of e.m.f. 12 V and internal resistance 0.5 Ω is connected to an external resistor of 4.5 Ω. (a) Calculate the current in the circuit. (b) Calculate the terminal potential difference of the battery. (c) Calculate the power dissipated in the external resistor. (d) State and explain what happens to the terminal p.d. as the external resistance is decreased.

[7 marks]

Physics

Edexcel2023

(cid:177) =!< >!< > (cid:55)he resisti(cid:89)it(cid:92) of graphite is (cid:22) × 10<= (cid:159) (cid:80). (cid:56)se the graph to dra(cid:90) a concl(cid:88)sion a(cid:69)o(cid:88)t 2*/!/55/62!75!(00.4&!6-(1!27!&'()*.2/; (cid:47)ength of pencil lead (cid:32) 15.0 c(cid:80). !"# ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

Question

Physics

CAIE2023

The rectified output of a sinusoidal signal generator is connected across a resistor R of resistance 1.5kΩ as shown in Fig. 4.1. rectified

Question

Physics

CAIE2023

5kΩ 800Ω -9V 0V 0V Fig. 8.2 The operational amplifier (op-amp) is ideal. Some values for the resistance of the thermistor at different temperatures are given in Fig. 8.3. temperature / °C resistance / Ω

Question

Physics

Edexcel2023

-(#,/*0!5&'(!'*73*)#':)*; !"# ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ((cid:69)(cid:12) (cid:55)he heater s(cid:90)itches on (cid:90)hen the te(cid:80)perat(cid:88)re falls (cid:69)elo(cid:90) 20(cid:131)C. Calc(cid:88)late the resistance of the fi(cid:91)ed resistor (cid:53). !# ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 8*0&0'#,-*!

Question

Physics

Edexcel2023

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Question

Biology

CAIE2023

When neurone X and neurone Y are stimulated at the same time, an action potential will not occur in the postsynaptic neurone. Explain whether or not you agree with these statements. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ............................................................................................................................................. [3] © UCLES 2023 9700/42/O/N/23 PMT

Question

Physics

Edexcel2023

)' !"#

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Question

Physics

Edexcel2023

The circuit shown provides an input to a transistor. A transistor is a type of electronic switch and in this circuit it can be assumed to have infinite resistance.

Question

Physics

Edexcel2023

0 V to transistor 333 Ω The resistance of the LDR varies with light level as shown below. 100 000

Question

Physics

Edexcel2023

000 Resistance / Ω 1000 100

Question

Physics

Edexcel2023

*P71915A01128*  Turn over DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA AERA SIHT NI ETIRW TON OD AERA SIHT NI ETIRW TON OD AERA SIHT NI ETIRW TON OD PMT (a) Deduce whether this circuit responds as required. (6) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. (b) Explain how the resistance of the LDR changes as the light level increases. (2) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. (Total for Question 13 = 8 marks) *P71915A01228* DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA AERA SIHT NI ETIRW TON OD AERA SIHT NI ETIRW TON OD AERA SIHT NI ETIRW TON OD PMT

Question

Physics

Edexcel2023

m s–1 from rest in 4.0 s. mass of car = 1950 kg (3) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. Work done by resistive forces = .............................................................. (c) A website suggests that ‘fast‑charging’ the battery in an electric vehicle can increase the internal resistance of the battery. Explain why an increase in internal resistance of a battery is a disadvantage. (3) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. (Total for Question 16 = 12 marks) *P71915A01828* DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA AERA SIHT NI ETIRW TON OD AERA SIHT NI ETIRW TON OD AERA SIHT NI ETIRW TON OD PMT

Question

Biology

CAIE2023

/arbitrary units (au)

Question

Physics

Edexcel2023

P = t v2 = u2 + 2as W P = t Forces useful energy output efficiency = ∑F = ma total energy input F g = useful power output m efficiency = total power input W = mg moment of force = Fx Momentum p = mv Turn over *P71915A02428* DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA AERA SIHT NI ETIRW TON OD AERA SIHT NI ETIRW TON OD AERA SIHT NI ETIRW TON OD PMT Electric circuits Waves and particle nature of light Potential difference Wave speed W v = f λ V = Q Speed of a transverse wave on a string Resistance T V v = R = μ I Intensity of radiation Electrical power and energy P P = VI I = A P = I 2R Power of a lens V 2 P = 1 R P = f W = VIt P = P + P + P + …

Question

Biology

CAIE2023

The fruit fly, Drosophila melanogaster, has autosomal genes for body colour and wing shape. Gene B/b is involved in the production of body colour: • B = dominant allele for brown body colour • b = recessive allele for black body colour. Gene D/d is involved in wing shape: • D = dominant allele for straight wing • d = recessive allele for curved wing. A dihybrid test cross was carried out between flies heterozygous for body colour and for wing shape and flies homozygous recessive for body colour and for wing shape. (a) Table 5.1 shows the number of offspring of each phenotype obtained in the test cross. Table 5.1 observed expected phenotype number number brown body colour, straight wings 2843 brown body colour, curved wings 855 black body colour, straight wings 842 black body colour, curved wings 2768 Use Table 5.1 to calculate the expected number of each phenotype if the two genes are on different autosomes. Write your answers in the table. [1] (b) A chi-squared (χ2) test was carried out to compare the observed results with the results that would be expected from a dihybrid cross involving genes on different autosomes. The value of χ2 = 2097.836. Table 5.2 shows the critical values for the χ2 distribution. Table 5.2 p value degrees of freedom

Question

Biology

CAIE2023

hours You must answer on the question paper. No additional materials are needed. INSTRUCTIONS ● Answer all questions. ● Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs. ● Write your name, centre number and candidate number in the boxes at the top of the page. ● Write your answer to each question in the space provided. ● Do not use an erasable pen or correction fluid. ● Do not write on any bar codes. ● You may use a calculator. ● You should show all your working and use appropriate units. INFORMATION ● The total mark for this paper is 100. ● The number of marks for each question or part question is shown in brackets [ ]. This document has 24 pages. Any blank pages are indicated. [Turn over *5046300420* PMT DC (ST/JG) 323130/3 © UCLES 2023 PMT

Question

Biology

CAIE2023

Question

Biology

CAIE2023

(b) Explain how processes such as ethanol fermentation and lactate fermentation allow cells to continue to function in the absence of oxygen. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ............................................................................................................................................. [3] (c) The cereal crop rice, Oryza sativa, grows in fields that are flooded with water. The roots of the rice plants are submerged in water that contains very little oxygen. Describe and explain how rice plants are adapted to grow in flooded fields. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ............................................................................................................................................. [3] [Total: 9] © UCLES 2023 9700/42/O/N/23 [Turn over PMT

Question

Biology

CAIE2023

Question

Biology

CAIE2023

Yeasts are unicellular organisms from the kingdom Fungi. Saccharomyces cerevisiae is one species of yeast that can carry out either asexual reproduction by mitosis or sexual reproduction by meiosis. Budding in S. cerevisiae is a process where a small daughter cell forms as a bud on the parent cell. The bud contains a copy of the parent cell nucleus and it eventually separates from the parent cell to form a new cell. S. cerevisiae can exist in two forms: haploid cells or diploid cells. • Haploid cells can be one of two different mating types: a and α. • Haploid cells can only mate with other haploid cells of the opposite mating type. Fig. 2.1 shows the life cycle of S. cerevisiae with its asexual and sexual reproductive stages. Key: a mating type a a α α a budding budding α mating type α α a

Question

Biology

CAIE2023

aα aα lack of nutrients aα an ascus - a sac containing 4 four spores

Question

Biology

CAIE2023

5 a α a α germination when conditions have improved Fig. 2.1 © UCLES 2023 9700/42/O/N/23 PMT

Question

Biology

CAIE2023

(a) With reference to Fig. 2.1, state the numbers of the stages 1–5 that: involve mitosis .................... involve meiosis .................... produces new genetic variation .................... shows only haploid cells .................... shows only diploid cells .................... [5] (b) When there is a lack of nutrients, cells made in stage 3 will carry out stage 4 to make spores, which germinate only when conditions improve. Suggest and explain how the type of reproduction that makes spores during stage 4 is advantageous for S. cerevisiae in a changing environment. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ............................................................................................................................................. [4] (c) Haploid and diploid cells of S. cerevisiae can carry out asexual reproduction. Suggest why a new harmful recessive mutation may not have a damaging effect on: • an asexually reproducing population of haploid cells of S. cerevisiae • an asexually reproducing population of diploid cells of S. cerevisiae. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ............................................................................................................................................. [3] © UCLES 2023 9700/42/O/N/23 [Turn over PMT

Question

Biology

CAIE2023

Research suggests that selective breeding began about 10 000 years ago. Selective breeding has been important in satisfying the global demand for food. (a) The introduction of disease resistance to varieties of wheat is an example of selective breeding. Outline the steps involved in the introduction of disease resistance to varieties of wheat. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ............................................................................................................................................. [5] (b) Suggest two possible disadvantages of selective breeding. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ............................................................................................................................................. [2] [Total: 7] © UCLES 2023 9700/42/O/N/23 [Turn over PMT

Question

Biology

CAIE2023

(a) A marker gene can be used when a gene of interest is introduced into a plant by genetic engineering. Describe and explain how the use of a marker gene coding for a fluorescent product can show that the introduced gene of interest is being expressed in plants. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ............................................................................................................................................. [4] (b) Give two advantages of genetically engineering herbicide resistance in crop plants such as soybean. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ............................................................................................................................................. [2] © UCLES 2023 9700/42/O/N/23 PMT

Question

Biology

CAIE2023

5.991 9.210 13.816

Question

Biology

CAIE2023

7.815 11.345 16.266

Question

Biology

CAIE2023

When only neurone Y is stimulated, an action potential will occur in the postsynaptic neurone.

Question

Physics

Edexcel2022

A student drives a go‑kart up a slope. (a) The slope is at an angle of 5.7° to the horizontal. The go‑kart moves with a constant velocity of 2.8 m s−1. Calculate the power of the go‑kart. mass of go‑kart and driver = 60 kg resistive force on the go‑kart = 18 N (4) ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... Power = ....................................................... (b) The go‑kart is powered by a battery connected to a motor. The rate of thermal energy transfer by the wiring in the motor is 55 W. Calculate the resistance of the wiring in the motor. current in motor = 24 A (2) ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... Resistance of the wiring in the motor = ....................................................... (Total for Question 11 = 6 marks) 

Question

Physics

Edexcel2022

10 20 30 Time / ms Determine a value for the capacitance of the capacitor. resistance of R = 2.2 kΩ (3) ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... Capacitance = ....................................................... (Total for Question 14 = 8 marks) 

Question

Physics

Edexcel2022

A potential divider circuit may contain a component known as a potentiometer. One type of potentiometer consists of a track with terminals X and Y at either end. There is a sliding contact that can move along the track connected to a terminal Z as shown. track end view of track 115 mm X Y t sliding contact 5.0 mm Z 5.0 mm The length of the track is 115 mm and the width is 5.0 mm. (a) The resistance of the track between terminal X and terminal Y is 12.0 kΩ. Calculate the thickness t of the track. resistivity of track material = 0.49 Ω m (3) ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... t = ....................................................... 

Question

Physics

Edexcel2022

*P69306A02228* PMT (iii) When the circuit is assembled, using the correctly calculated resistance value and a battery of e.m.f. 12 V, it is found that the maximum output from the potentiometer is slightly less than 5.0 V. Explain why the maximum output is slightly less than predicted. (3) ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... (iv) The tool on the machine should not travel with a speed any larger than 0.8 m s−1 . The graph shows how the displacement varies with time for the downward stroke of the moving tool.

Question

Physics

Edexcel2022

*P69306A02128* Turn over PMT (b) The potentiometer is used to monitor the displacement of a moving tool on a machine in a production line. The tool is attached to the sliding contact. The potentiometer is connected to a resistor of resistance R and a potential difference is applied as shown. The tool moves through a maximum displacement of 60 mm from end X, producing a maximum potential difference of 5.0 V between Z and X. R

Question

Physics

Edexcel2022

*P69306A02528* Turn over PMT Electric circuits Waves and particle nature of light Potential difference Wave speed W v = f λ V = Q Speed of a transverse wave on a string Resistance T V v = R = μ I Intensity of radiation Electrical power and energy P P = VI I = A P = I 2R Power of a lens V 2 P = 1 R P = f W = VIt P = P + P + P + …

Question

Physics

Edexcel2022

A ball is thrown with an initial horizontal component of velocity u and an initial vertical component of velocity v. The effects of air resistance are negligible. Which of the following statements about the motion of the ball is not correct? A The magnitude of the acceleration in the vertical plane is g. B The horizontal component of velocity is constant. v C The time taken for the ball to reach its maximum height is equal to . g D The maximum height of the ball depends on the values of u and v. (Total for Question 3 = 1 mark) 

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Physics

Edexcel2021

Which of the following is the total resistance of the resistors in parallel? A 20 Ω B 40 Ω C 90 Ω D 180 Ω (Total for Question 5 = 1 mark)

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Physics

Edexcel2021

The world solar challenge is set every two years, in Australia. The challenge is to complete a three thousand kilometre route with a vehicle powered only by the Sun. Vehicles have their surfaces fitted with solar panels, as shown in the photograph. (Source: © LAURENT DOUEK/LOOK AT SCIENCES/SCIENCE PHOTO LIBRARY) (a) One of the solar panels has an e.m.f. of 8.2 V when in sunlight. The terminal potential difference is 5.5 V when a current of 0.45 A is drawn from the solar panel. Calculate the internal resistance of the solar panel in these conditions. (3) ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... Internal resistance = ....................................................... (b) A bank of 380 of these solar panels is used to charge the battery in a vehicle. The panels are connected in parallel and the current provided by each panel is 0.45 A. When fully charged, the energy stored in the battery is 12 kW h. Calculate the time, in hours, to fully charge this battery if the solar panels are in sunlight. Assume the efficiency of charging this battery is 100%. (3) ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... Time = hours .......................................................

Question

Physics

Edexcel2021

A light dependent resistor (LDR) and a resistor are connected to a battery, as shown. The intensity of light incident on the LDR increases. Which row of the table describes the change in the resistance of the LDR and the change in the potential difference across the resistor? Potential Resistance difference across of LDR the resistor A decreases decreases B decreases increases C increases decreases D increases increases (Total for Question 7 = 1 mark)

Question

Physics

Edexcel2021

5 m Deduce whether, if air resistance is ignored, the ball could land on the green after a flight time of 3.5 s. (5) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. (Total for Question 12 = 9 marks)

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Physics

Edexcel2021

*P67096A02632* PMT (b) An ammeter of this type has a resistance of 625 Ω and will measure a maximum current of 1.6 mA. The ammeter can be adapted to measure potential difference by adding a resistor in series with the ammeter. This resistor is known as a multiplier. The ammeter is adapted so that it can measure potential differences up to 5.0 V as shown. 625 Ω multiplier

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Physics

Edexcel2021

*P67096A02932* PMT Electric circuits Waves and particle nature of light Potential difference Wave speed W v = f λ V = Q Speed of a transverse wave on a string Resistance T V v = R = μ I Intensity of radiation Electrical power and energy P P = VI I = A P = I 2R Power of a lens V 2 P = 1 R P = f W = VIt P = P + P + P + …

Question

Physics

Edexcel2020

Calculate the power dissipated by the resistance R when the potential at Y is 2.0 V.

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