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Don’t write in this margin c fzks Renganaden Seeneevassen SSS Internal October 2017 FORM 4 PHYSICS PAPER 2 2 hours This document consists of 13 pages. 100 MARKS ANSWER ALL QUESTIONS NAME & CLASS 1. A stone is released from an aircraft. The speed-time graph of its motion is shown in figure 1.1. Figure 1.1: Graph of stone falling towards earth (a) State and explain the value of the acceleration at point P. ................................................................................................. ................................................................................................. ................................................................................................. [2] (b) Why does the speed become constant after R? ................................................................................................. ................................................................................................. ................................................................................................. [2] (c) Draw a line of the graph which would have been obtained had there been no air resistance. [1] c fzks R4S Internal 2017 FORM 4

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Page 1: Renganaden Seeneevassen SSS Internal October …...Don’t write in this margin c fzks Renganaden Seeneevassen SSS Internal October 2017 FORM 4 PHYSICS PAPER 2 2 hours This document

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c©fzks

Renganaden Seeneevassen SSSInternal October 2017 FORM 4

PHYSICS PAPER 22 hours This document consists of 13 pages. 100 MARKS

ANSWER ALL QUESTIONS

NAME & CLASS

1. A stone is released from an aircraft. The speed-time graph of its motion is shown in figure 1.1.

Figure 1.1: Graph of stone falling towards earth

(a) State and explain the value of the acceleration at point P.

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(b) Why does the speed become constant after R?

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(c) Draw a line of the graph which would have been obtained had there been no air resistance. [1]

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(d) Estimate the distance fallen by the stone in the first 100 seconds.

distance = ...................................[3]

(e) Write down the conversion of energy occurring at S.

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(f) Add a line on the graph for a stone released on the moon. [2]

[Q1. Total: 12 marks]

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2. Two breakdown vehicles A and B are trying to tow a lorry out of a ditch as shown in figure 2.1.

Figure 2.1: Pulling a lorry out of a ditch

Vehicle A exerts a force of 3000 N while B exerts a force of 4000 N at an angle of 45◦to reach other.

(a) Why is the resultant force that the breakdown vehicles exert on the lorry not 7000 N?

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(b) In the space below, determine the resultant force on the lorry using a scale drawing. [1000 N isrepresented by 1 cm]

resultant force = ................................... at an angle of ............... to vehicle A.[6]

[Q2. Total: 8 marks]

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3. Figure 3.1 shows a car travelling on a level road.

Figure 3.1: Car on level road

(a) Given that the acceleration of the car is 3 ms−2, calculate the mass of the car.

mass of car= ...................................[2]

(b) Indicate using an arrow on figure 3.1 the weight of the car. [1]

(c) The car now climbs an upward slope. Why is the acceleration likely to decrease?

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(d) The car now goes round a bend at constant speed.(i) Explain why the car must be accelerating while going round the bend.

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(ii) Write down the name of the force that provides the centripetal force in this situation.

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[Q3. Total: 9 marks]

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4. Define work done.

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An electrician in the figure below climbs the stairs of a tower to repair a spotlight.

Figure 4.1

(a) Given that the mass of the electrician is 60 kg and that the tower is 8 m high, calculate his workdone on climbing the ladder to reach the top.

work done= ...................................[2](b) While repairing the spotlight, the electrician loses grip on his screwdriver and the latter falls to the

ground. The screwdriver loses potential enegy and gains kinetic energy.Calculate the speed with which the screwdriver hits the ground.

speed with which screwdriver hits the ground = ...................................[2]

[Q4. Total: 6 marks]

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5. Write down the principle of moments.

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Two boys are on a see-saw. The mass of the boy at A is 25 kg while that for the one at B is 32 kg. Thelength of AP and BP are equal to 80 cm.

Figure 5.1: Two boys on see-saw

(a) Why is it that when both boys are at the end of the see-saw, end B moves down?

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(b) The boy at A remains at A. Calculate the distance from end B that the heavier boy must move inorder for the see-saw to be horizontal.

distance= ...................................[3][Q5. Total: 7 marks]

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6. The manometer in figure 6.1 shows the gas pressure being measured. The atmospheric pressure is760 mm of mercury

Figure 6.1: Manometer measuring gas pressure

(a) Mark on the manometer a point where the pressure is equal to the atmospheric pressure. [1](b) How does the figure show that the gas pressure is greater than the atmospheric pressure?

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gas pressure = ...................................[2](d) Suggest how the levels of mercury will change if a tube of half the diameter were used.

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[Q6. Total: 7 marks]

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7. In what way is the heat capacity different from the specific heat capacity? [no definitions required-Giveyour answer in terms of general explanation/units/formulae ]

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The graph of figure 7.1 shows 50 g of ice being heated by a 500 W heater.

Figure 7.1: Ice being heated

(a) Indicate a point on the graph with the labelling F where water is boiling. [1]

(b) The specific heat capacity of water is 4200 Jkg−1K−1.Calculate the time taken to heat the water from 0 ◦C to 100 ◦C.

time taken = ...................................[2]

(c) On the basis of your previous answer, estimate the time taken for the ice to melt.

time taken for ice to melt = ...................................[2]

(d) Explain why the molecules are gaining potential energy along DE but not kinetic energy.

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[Q7. Total: 9 marks]

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8. Water is being heated as shown in figure 8.1

Figure 8.1: Water being heated

(a) Explain the process of convection by which water is heated.

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(b) Indicate on figure 8.1 the convection currents. [1]

(c) Draw arrows to show radiation from the filament. [1]

(d) Explain why conduction does not play a major part in the transfer of heat through the water.

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(e) Evaporation also plays a role in heat loss. Explain how evaporation produces cooling.

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[Q8. Total: 8 marks]

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9. Define temperature.

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Figure 9.1: Thermometer

(a) Indicate on the liquid-in-glass thermometer of figure 9.1 the bulb, capillary tube, stem and scale. [2]

(b) Work out the sensitivity of the thermometer.

sensitivity = ...................................[2]

(c) Give one situation where a thermocouple is used instead of a liquid-in-glass thermometer.

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[Q9. Total: 6 marks]

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10. Light can be reflected.Write down the relationship between the angle of reflection and incidence.

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The figure below shows a lady of height 160 cm looking at herself in the mirror.

Figure 10.1: Lady looking at her image in a mirror

(a) Draw rays to show how the lady sees her head. [2]

(b) Draw rays to show the lowest part of herself that the lady can see in the mirror. [2]

(c) Explain using diagrams why the minimum length of the mirror for the person to see a full imageof herself is 80 cm.

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[Q10. Total: 8 marks]

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11. What is refraction and why does it occur?

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A student draws the path of light through a prism as shown in the figure 11.1

Figure 11.1: Light through prism

(a) Determine the angle of refraction at A.

refraction at A = ...................................[1]

(b) Calculate the refractive index of glass.

refractive index of glass = ...................................[2]

(c) Hence calculate the critical angle of the glass.

critical angle = ...................................[2]

(d) Use your answer to explain what happens at B.

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(e) Draw the path of a ray of light that enters the prism along the normal at A. [1]

[Q11. Total: 11 marks]

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12. Define the focal length of a lens.

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An object of height 1 cm is placed 3 cm from a lens of focal length 2 cm.

(a) Draw the image. [4]

(b) Work out the magnification of the image.

magnification= ...................................[1]

(c) Write down two characteristics of the image.

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[Q12. Total: 9 marks]

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