F5 MID-TERM EXAM PHYSICS PAPER 2 (SMKRPK 2007)

SMKRPK/2007/F5/PPT_PHYSICS

Section A [60 marks] 1.

Diagram 1.1 shows an electric circuit.

Diagram 1.1 (a) (i) Name instrument Q. ………………………………………………………………………… …… (1 mark) (ii)

What is the function of R in the circuit? …………………………………………………………………………

…… (1 mark) (b) Diagram 1.2 shows two types of ammeter, X and Y, that can be used in the circuit in Diagram 1.1

Diagram 1.2 (i)

Which ammeter is more sensitive? ………………………………………………………………………………….

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(1 mark) (ii)

Give one reason for your answer in 1(b)(i). …………………………………………………………………………………. (1 mark)

2.

Diagram 2 shows a mercury thermometer which has not been calibrated.

Diagram 2 (a) (i)

(ii)

State the physical change in the mercury when the temperature increase. ……………………………………………………………………… (1 mark) Why mercury used in the thermometer? ……………………………………………………………………… (1 mark)

(b) The length of the mercury column in the thermometer is 2.6 cm at 0 OC and 22.6 cm at 100 OC (i)

What is the difference in the length of the mercury columns at 0 OC and 100 OC. ……………………………………………………………………… (1mark)

(ii)

When the thermometer is placed in hot water, the length of the mercury column is 16.9 cm Calculate the temperature of the hot water.

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( 2 marks) 3. Diagram 3 shows two loudspeakers connected to an audio frequency generator Students are standing at positions where loud sounds can be heard.

Diagram 3 (a)

What type of wave is the sound wave? ………………………………………………………………………….

(b)

(1mark) Why are loud sounds heard by the students at this position? ………………………………………………………………………… (1 mark)

(c)

The distance between the two loudspeakers is 1.5 m. At 10.0 m from the loudspeakers, the distance between two adjacent rows of students is 4.0 m, calculate the wave length of this sound wave.

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( 2 marks) (d)

The frequency of the sound wave is increased. (i) What will happen to the distance between two adjacent rows where loud sounds are heard? ………………………………………………………………………………… …………………………………………………………………………………. (1 marks) (iii)

Give a reason for your answer in 3 (d) (i)

……………………………………………………………………………… ……………………………………………………………………………… (1 mark)

Diagram 4 (c) Diagram 4 shows a micrometer screw gauge is being used to measure the thickness of a metal plate X. (a) Name the parts labelled Q ……………………………………………………………………… (1mark) (b)

What is the function of X? …………………………………………………………………………. ( 1mark)

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(c)

When P is turned a full circle, its horizontal displacement is 0.5 mm. The vernier scale has 50 divisions. What is the width of each scale? ……………………………………………………………………… (1mark)

(d)

What is the sensitivity of the instrument?

(e)

……………………………………………………………………… (1mark) If the zero error of this instrument is -0.05 mm, determine (i)

the reading as shown in Diagram 4 ……………………………………………………………… (1mark)

(ii)

the thickness of plate X ……………………………………………………………… ……………………………………………………………… (2marks)

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(d) Diagram 5.1 shows a submarine equipped with an optical instrument P. Diagram 5.2 shows the structure of the optical instrument P.

(a) Name the optical instrument P. …………………………………………………………………………………………. (1mark) (b) In Diagram 5.2, two glass prisms must be placed so that the object can be seen by the observer. The position of one of the glass prism is shows.

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(i) In box A in Diagram 5.2, draw and shade the second prism.

(1mark)

(ii) Explain why the prisms in optical instrument are placed as in 5(b)(i). ……………………………………………………………………………………… ……………………………………………………………………………………… (1mark) (c) (i) In Diagram 5.2, complete the path of the light ray from the object to the observer’s eye. (1mark) (ii) State one characteristics of the image observed.

(d)

……………………………………………………………………………………… (1mark) The refractive index of the glass prism is 1.52. Calculate the critical angle of the glass prism.

(2marks)

Diagram 6.1

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Diagram 6.2 (e) Diagram 6.1 shows the situation of a sheet of paper before and when air is blown. Diagram 6.2 shows situation of the canopy before the lorry moves and when the lorry at high speed. (a) What is meat by “speed”? ……………………………………………………………………………………… (1mark) (b) Based on Diagram 6.1 and Diagram 6.2: (i)

State two similarities for situations in Diagram 6.1 and Diagram 6.2 1. ……………………………………………………………………… ………………………………………………………………………… …………………………………………………………………………. 2……………………………………………………………………… ………………………………………………………………………… ………………………………………………………………………… (2marks)

(ii)

Compare the air pressure above and below the paper when air is blown ………………………………………………………………………….

(iii)

(1mark) Relate the speed of the air to the pressure of the air. ………………………………………………………………………….

(1mark) (c) Name the principle involved in 6(b)(iii). ……………………………………………………………………………………… (1mark)

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Diagram 6.3 (d) Diagram 6.3 shows an instrument used to measure the speed of air. In Diagram 6.3, the levels of coloured water in U-tube are the same before air flows. (i)

Compare the speeds of air at P and Q. ..................................................................................................... (1mark)

(ii)

Mark the water levels in U-tube in Diagram 6.3 while air flows (1mark)

(f) Diagram 7.1 and Diagram 7.2 show a student throwing iron ball in shot put event using different throwing techniques. The angle of projection and the force used by the student in both techniques are the same. D (a)

Observe the above diagrams. (i)

(ii)

(iii)

Compare the distance of the hand movement to throw the iron ball. ……………………………………………………………………… (1mark) Based on the answer in 7(a)(i), compare the work done by the student between the two throw techniques. ……………………………………………………………………… (1mark) If the force which acts on the iron ball is 30 N and the distance of the hand movement is 0.5 m, calculate the work done by the student.

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(2mark) (b) (i) Based on the answer in 7(a)(i), state the relationship between the energy gained by the iron ball and the distance of projection. ……………………………………………………………………………………… (1mark) (ii) State the principle involved. ……………………………………………………………………………………… (1mark) (c)

(i) Using Diagram 7.1, what happens to the falling time if an iron ball of bigger mass is used? ………………………………………………………………………………… (1mark) (iii)

Give one reason for your answer in 7(c)(i) ………………………………………………………………………… ………………………………………………………………………… (1mark)

(g) Diagram 8 shows part of a roller coaster track. A car of mass 600 kg moves on track ABCDE with negligible friction.

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Diagram 8 At point A, the car moves with speed 15 ms-1. (a) What is the total energy of the car at point A?

(4marks)

(b) What is the speed of the car at point D?

(4marks)

(c) What is the kinetic energy at point E?

(4marks)

Section B [ 20 marks] Answer any one question

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Diagram 9(c) 9.

Diagram 9(a) and Diagram 9(b) show the condition of the drivers in two separate cars that stopped suddenly (a)

What is the meaning of “impulse”?

(b)

What will happen if two cars were to collide head-on with big impulse? ([3marks]

(c)

By referring to Diagram 9(a), explain why the driver is able to avoid serious injuries? [2marks]

(d)

Explain the advantages for a driver to wear a safety belt which is broad and is capable to lengthen slightly when he is been thrown forward. ([4marks]

(e)

Diagram 9(c) shows an antique car. Using appropriate physics concepts, explain the possible alterations that can be made to transform the car into safer and more comfortable car. [10marks]

10.

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[1mark]


Diagram 10(a)

Diagram 10(b)

Diagram 10(a) shows a karateto using his bare hands to break some wooden boards whereas Diagram 10(b) shows a pestle used to smash up some chilies. (a)

What is meant by “momentum”?

[1mark]

(b)

Compare the motions of the hand of the karateto and the pestle, and also the time of reaction with the respective surfaces. Relate the changes in the wooden board and the chilies to deduce a relevant physics concept. Name the concept. [5marks]

(c)

State the Newton’s third law of motion.

[1mark]

(d) When a bullet is fired from a gun, it is noticed that the gun will recoil and move in opposite direction to the bullet. Explain the phenomenon. [3marks] (d)

A space shuttle is returning to the Earth. It falls through the Earth’s atmosphere and reaches a very high temperature. This is due to Earth’s gravitational force and air resistance. By using appropriate physics concepts, suggest and explain suitable designs or ways to protect the space shuttle, its equipments and the astronauts (i)

from extreme heat

(ii)

from breaking upon landing

Section C [20marks] Answer any one question

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[10marks]


11. (a) What is meant by “specific latent heat of vapourization”?

[1mark]

(b) Explain why someone who is sweating feels cool when he is under a rotating fan. [4marks] (c) A solid substance, of mass 0.05 kg is heated using an immersion heater of 240 V, 0.1 kW. Diagram 11 shows the heating curve of the solid.

Calculate (i)

the specific latent heat of fusion of the substance

(ii)

the specific heat capacity of the substance in liquid state. [5marks]

(d) You are asked to investigate the features of cooling material and the design of a car engine radiator as in Diagram 12. Explain the suitability of each feature in Diagram 12 and then determine he most suitable car engine radiator to be used. 14


Give a reason for your choice.

[10 marks]

Diagram 12

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12.

You are asked to investigate the characteristics of fie types of wire of the same length. Table below shows the characteristics of the wire you have investigated. Wire P Q R S T

Melting Point (OC) 250 425 800 1250 300

Diameter (m) 2.0 x 10-3 3.2 x 10-3 1.5 x 10-3 1.0 x 10-3 1.4 x 10-3

(a) State Ohm’s law and define the term resistance.

Resistance (Ω) 4.3 0.5 1.2 5.8 7.2 [4marks]

(b) Based on the table, explain the suitable characteristics of a wire which Can be used as a heating element [6 marks] (c) Explain the factors affecting the resistance of a piece of wire [8 marks] (e) A current of 0.2 A flows through a lamp of 22.5 Ω. What is the voltage needed to drive the current?

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[2 marks]


Graph paper for Question1(d)

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F5 MID-TERM EXAM PHYSICS PAPER 2 (SMKRPK 2007)

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