CSEE Physics Paper 1 1992 — Past Paper & Online Quiz

1. 5 marks

(a) Define “Uniform acceleration” 1 mk

(b) Starting from rest and after 5 minutes, a train reached a velocity of 500 m/s. If the acceleration had been constant, how far did the train travel in the 5 minutes? 4 mk

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2. 5 marks

(a) A glass stopper weighs 37.5 g in air, 22.5g in water and 24.0g in lubricating oil. Find the (i) relative density of the lubricating oil (ii) relative density of the glass 3 mk

(b) State the principle you applied in your calculations in 2(a) above. 2 mk

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3. 6 marks

(a) Draw a ray diagram to show the direction of path of the reflected rays when a parallel beam of light falls close and parallel to the principal axis of a concave mirror. 2 mk

(b) A concave mirror has a curvature of radius 20cm. Find the position, magnification and nature of the image of a small pin placed on the axis at right angles to it at 15cm from the pole. 4 mk

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4. 6 marks

The figure below shows a snap shot of a wavelength in a string. The numbers on the diagram show scales in centimetres. The speed of travel of the wave is 8 m/s. With reference to this wave motion what is the

(a) wavelength? 2 mk

(b) amplitude? 2 mk

(c) frequency? 2 mk

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5. 5 marks

(a) With application of the same force on the same material, a sharp knife cuts more easily than a blunt knife. Explain why. 2 mk

(b) Find the liquid pressure at a point 50m below sea-water whose relative density is 1.024 3 mk

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6. 4 marks

The above diagram shows a vertical uniform tube containing a mercury thread CB and a volume of air AB. (a) If the atmospheric pressure is 75mmHg, what is the pressure of the air trapped in the tube? (b) If the tube is now turned through 90°, what will be the length of the air column AB?

(a) If the atmospheric pressure is 75mmHg, what is the pressure of the air trapped in the tube? 2 mk

(b) If the tube is now turned through 90°, what will be the length of the air column AB? 2 mk

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7. 5 marks

With the aid of a diagram, show why a pool of water appears shallower than it really is. A swimming pool is seen to have a depth of 9m when viewed from above. What is its actual depth? (Refractive index of air-water is 4/3)

(a) With the aid of a diagram, show why a pool of water appears shallower than it really is. 2 mk

(b) A swimming pool is seen to have a depth of 9m when viewed from above. What is its actual depth? (Refractive index of air-water is 4/3) 3 mk

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8. 5 marks

Prove that when three resistors; $R_1$, $R_2$ and $R_3$ are arranged in series, the effective resistance, $R_e$ is the sum of the separate resistors. Two 2Ω resistors connected in parallel are connected in series to a 3Ω resistor and then connected to a cell of emf 2v and internal resistance 1Ω. Calculate the current in the circuit.

(a) Prove that when three resistors; $R_1$, $R_2$ and $R_3$ are arranged in series, the effective resistance, $R_e$ is the sum of the separate resistors. 2 mk

(b) Two 2Ω resistors connected in parallel are connected in series to a 3Ω resistor and then connected to a cell of emf 2v and internal resistance 1Ω. Calculate the current in the circuit. 3 mk

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9. 5 marks

Distinguish between a primary colour and a secondary colour. Jessie is wearing a blue with red spots neck-tie. What is the appearance of the neck-tie in (i) blue light? (ii) red light? (iii) yellow light?

(a) Distinguish between a primary colour and a secondary colour. 2 mk

(b) Jessie is wearing a blue with red spots neck-tie. What is the appearance of the neck-tie in (i) blue light? (ii) red light? (iii) yellow light? 3 mk

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10. 5 marks

Differentiate between mass and weight. Explain clearly why a given object weighs more on the earth than on the moon.

(a) Differentiate between mass and weight. 2 mk

(b) Explain clearly why a given object weighs more on the earth than on the moon. 3 mk

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14. 7 marks

The above graph shows a decay curve for a radioactive substance. Use it to determine the half-life of the substance.

((a)(i) The above graph shows a decay curve for a radioactive substance. Use it to determine the half-life of the substance. 5 mk Diagram for part (a)(i

((b)(i) What is A in equation 14(b)(i) above? 1 mk

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11. 10 marks

The diagram above illustrates how pressure at a person’s ear varies with time for two different sounds A and B from two different sources. (a) Calculate the frequency of sound A. (b) Comment on the difference in the sounds heard by referring to their pitch and their loudness.

(a) Calculate the frequency of sound A. 4 mk

(b) Comment on the difference in the sounds heard by referring to their pitch and their loudness. 6 mk

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12. 10 marks

(a) (i) Distinguish between heat and temperature. (ii) What causes heat to flow from one point to another? (b) Summarize the results of Leslies’ Cube experiment.

((a)(i) What causes heat to flow from one point to another? 2 mk

(b) Summarize the results of Leslies’ Cube experiment. 6 mk

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13. 3 marks

Mention the factors on which the strength of the induced electromotive force depend.

(a) Mention the factors on which the strength of the induced electromotive force depend. 3 mk

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15. 5 marks

A transformer has 800 turns in the primary winding and 40 turns in the secondary winding. The alternating e.m.f. connected to the primary winding is 240v and the current flowing is 0.2A. Find the

(i) secondary e.m.f. 0 mk

((a)(i) What determines the magnitude of the e.m.f. induced in a length of conductor moving in a magnetic field? 0 mk

(ii) current flowing in the secondary winding if there are no power losses. 0 mk

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16. 10 marks

500g of water at 100° are added to a thick copper calorimeter at 15°C. The mass of the calorimeter is 1000g. (Specific heat capacity of copper = 0.4J/gK Specific heat capacity of water = 0.42J/gK)

(a) Distinguish between “the specific heat capacity” and “heat capacity”. 2 mk

((b)(i) What are the heat capacities of the water and the calorimeter? 3 mk

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17. 7 marks

A car of mass 3000kg is driven from rest with uniform acceleration and reaches a speed of 10m/s in 30 seconds. Find the

(a) Define “work”, “Energy” and “Power”. 3 mk

((b)(i) power, in kilowatts, developed at that speed (10m/s) 4 mk

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18. 8 marks

(a) With the aid of a diagram, define a “diode”. 4 mk

((b)(i) What do you understand by the terms: demodulation? 0 mk

(c) State the uses of a diode. 4 mk

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0. 5 marks

Figure M shows the same ⋂-core of iron with the four turn coil joined to a lamp instead of a galvanometer. A second ⋂-core of iron is now attached to the first and also has a four-turn coil which is joined to a 2-volt ac. supply.

(i) What would you see in the lamp? 2 mk

(ii) Briefly explain your observations in c(i) above. 3 mk

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Physics · Paper 1 · 1992

Physics · Paper 1 · 1992

Section A

Section B

Section C

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