Physics 9702 Sample Paper for practice 2013

7/28/2019 Physics 9702 Sample Paper for practice 2013

1/12

Sample paper for Physics paper I 9702, 2013 Compiled by Faiz ul Hasnain, A Team Academic Centre, # 13, MainSumbal Road F-10/2 Islamabad. 0321 530 7475 Please distribute free of cost to all students of Physics 9702 AS level.

1

1. When a voltage Vof 12.2 V is applied to a DC motor, the currentIin the motor is 0.20 A.

Which one of the following is the output powerVIof the motor given to the correct appropriate

number of significant digits?

A. 2 W

B. 2.4 W

C. 2.40 W

D. 2.44 W

2. The diagram below shows a boat that is about to cross a river in a direction perpendicular to the

bank at a speed of 0.8 m s1. The current flows at 0.6 m s1 in the direction shown.

0.8 ms

Boat

Bank

Bank

1

10.6 ms

The magnitude of the displacement of the boat 5 seconds after leaving the bank is

A. 3 m.

B. 4 m.

C. 5 m.

D. 7 m.

3. The graph shows the variation with time tof the velocity v of an object.v

tWhich one of the following graphs best represents the variation with time tof the acceleration a

of the object?

0 0

0 0

0 0

0 0

a a

a a

t t

t t

A. B.

C. D.


2/12


2

4. A ball, initially at rest, takes time tto fall through a vertical distance h. If air resistance is

ignored, the time taken for the ball to fall from rest through a vertical distance 9h is

A. 3t.

B. 5t.

C. 9t.

D. 10t.

5. When a gas in a cylinder is compressed at constant temperature by a piston, the pressure of thegas increases. Consider the following three statements.

I. The rate at which the molecules collide with the piston increases.

II. The average speed of the molecules increases.

III. The molecules collide with each other more often.

Which statement(s) correctly explain the increase in pressure?

A. I only

B. II only

C. I and II only

D. I and III only

6. Water waves at the surface of a pond pass a floating log of lengthL. The log is at rest relative to

the bank. The diagram shows wave crests at one instant.

L

The number of crests passing the log per unit time isN. The speed of the water waves relative to

the log at rest is

A.7

L(N 1).

B.6

L(N 1).

C.7

L(N).

D.6

L(N).

7. Two identical triangular pulses of amplitudeXtravel toward each other along a string. At the

instant shown on the diagram below, point M is midway between the two pulses.

X

X

M

The amplitude of the disturbance in the string as the pulses move through M is

A. 2X.

B. X.

C. .2

X

D. 0.(1)


3/12


3

8. A pulse is sent down a string fixed at one end.

Which one of the following diagrams best represents the reflected pulse?A.

C.

B.

D.

9. Which one of the field patterns below could be produced by two point charges?A.

C.

B.

D.

(1)

10. An electric motor is used to raise a weight of 2.0 N. When connected to a 4.0 V supply, the

current in the motor is 1.5 A. Assuming no energy losses, the best estimate for the maximum

steady speed at which the weight can be raised is

A. 0.3 m s1.

B. 3.0 m s1.

C. 9.0 m s1.

D. 12.0 m s1.(1)

11. A sample of radioactive carbon-14 decays into a stable isotope of nitrogen. As the carbon-14

decays, the rate at which the amount of nitrogen is produced

A. decreases linearly with time.

B. increases linearly with time.

C. decreases exponentially with time.

D. increases exponentially with time.

12. The unified mass unit is defined as

A. the mass of one neutral atom of 126 C.

B.12

1of the mass of one neutral atom of 126 C.

C.

6

1of the mass of one neutral atom of 126 C.

D. the mass of the nucleus of 126 C.


4/12


4

13. Natalie measures the mass and speed of a glider. The percentage uncertainty in her

measurement of the mass is 3% and in the measurement of the speed is 10%. Her calculated

value of the kinetic energy of the glider will have an uncertainty of

A. 30%.

B. 23%.

C. 13%.

D. 10%.

14. A sailing boat is moving with constant velocity v to the right parallel to the dock.

Sailor Hulot, up on the mast, drops his telescope at the moment he is opposite Lucie who is

standing on the dock. Which one of the following best shows the path of the falling telescope as

seen by Lucie?A. B.

C. D.

(1)

15. A positively charged sphere falls vertically in a vacuum between two long parallel plates

carrying opposite charges. Which one of the following diagrams best shows the path followed

by the sphere?

+

+

+

+

+

+

+

+

+

+

+

+

A. B.

C. D.


5/12


5

16. The diagram shows the electric field lines produced by an electrostatic focusing device.

Which one of the following diagrams best shows the corresponding equipotential lines? The

electric field lines are shown as broken lines on each of the diagrams.A. B.

C. D.

(1)

17. The ratioatomanofdiameter

nucleusaofdiameteris approximately equal to

A. 1015.

B. 108.

C. 105.

D. 10

2

.18. Which of the following quantities are conserved in an inelastic collision between two bodies?

Total linear momentum of the bodies Total kinetic energy of the bodies

A. yes yes

B. yes no

C. no yes

D. no no

19. An engine takes in an amountEof thermal energy and, as a result, does an amount Wof useful

work. An amountHof thermal energy is ejected. The law of conservation of energy and the

efficiency of the engine are given by which of the following?

Law of conservation of energy Efficiency

A. E = W + H W

B. E = W + H

E

W

C. E + H = W

H

W

D. E + H = W

HE

W


6/12


6

20. Two particles X and Y are situated a distance 2

1apart on a stationary wave of wavelength.

The variation with time tof the displacement dxof X is shown below.

0

d

t0

X

Which one of the following correctly shows the variation with time tof the displacement dYof

particle Y?

0

0

0

0

d

d

d

d

t

t

t

t

0

0

0

0

A.

C.

B.

D.

Y

Y

Y

Y

21. Which two values of temperature are equivalent to the nearest degree when measured on the

Kelvin and on the Celsius scales of temperature?

Kelvin scale Celsius scale

A. 40 313

B. 273 100

C. 313 40

D. 373 0

22. A substance changes from solid to liquid at its normal melting temperature. What change, if

any, occurs in the average kinetic energy and the average potential energy of its molecules?

Average kinetic energy Average potential energy

A. constant constant

B. increases constant

C. increases decreases

D. constant increases


7/12


7

23. Which diagram best shows diffraction of plane wave fronts at a single

slit?

A.

C.

B.

D.

24. The time periodTof oscillation of a mass m suspended from a vertical spring is given by the

expression

T= 2k

mwhere kis a constant.

Which one of the following plots will give rise to a straight-line graph?

A. T2 against m

B. T against m

C. Tagainst m

D. T against m

25. A machine lifts an object of weight 1.5 10

3

N to a height of 10 m. The machine has an overallefficiency of 20%. The work done by the machine in raising the object is

A. 3.0 103 J.

B. 1.2 104 J.

C. 1.8 104 J.

D. 7.5 104 J.

26. A fixed mass of an ideal gas is heated at constant volume. Which one of the following graphs

best shows the variation with Celsius temperature twith pressurep of the gas?

0

0

0

0

p

p

p

p

0

0

0

0

t/C

t/C

t/C

t/C

A.

C.

B.

D.


8/12


8

27. When a wave crosses the boundary between two media, which one of the following properties

of the wave does not change?

A. Amplitude

B. Wavelength

C. Frequency

D. Speed

28. Two positive point charges P and Q are held a certain distance apart.X P Y Q Z

+ +

At which point(s) could the electric field strength, due to the charges, be zero?

A. X only

B. Y only

C. Z only

D. X and Z only

29. Which one of the following shows a correct circuit, using ideal voltmeters and ammeters, formeasuring theI-Vcharacteristic of a filament lamp?

A

A

A

A

A.

C.

B.

D.

V

V

V

V

30. In a laboratory when aluminium nuclei are bombarded with -particles, the following reaction

may take place.

nPAlHe 103015

2713

42 ++

This reaction is an example of

A. nuclear fission.

B. nuclear fusion.

C. natural radioactive decay.

D. artificial transmutation.

31. Which one of the following is a scalar quantity?

A. Pressure

B. Impulse

C. Magnetic field strengthD. Weight


9/12


9

32. An electric train develops a power of 1.0 MW when travelling at a constant speed of 50 ms1.

The net resistive force acting on the train is

A. 50 MN.

B. 200 kN.

C. 20 kN.

D. 200 N.

33. The temperature of an ideal gas is reduced. Which one of the following statements is true?

A. The molecules collide with the walls of the container less frequently.

B. The molecules collide with each other more frequently.

C. The time of contact between the molecules and the wall is reduced.

D. The time of contact between molecules is increased.

34. A battery is connected in series with a resistorR. The battery transfers 2 000 C of charge

completely round the circuit. During this process, 2 500 J of energy is dissipated in the resistor

R and 1 500 J is expended in the battery.

The emf of the battery is

A. 2.00 V.

B. 1.25 V.C. 0.75 V.

D. 0.50 V.

35. The diagram below represents energy transfers in an engine.

engineinput energy useful output energy

wasted energy

E E

E

IN

W

OUT

The efficiency of the engine is given by the expression

A.IN

W

E

E.

B.

OUT

W

E

E.

C.IN

OUT

E

E

.

D.

W

OUT

E

E.

36. A temperature scale is to be constructed using the property X of a substance. Which of the

following must be a characteristic of the property X?

A. The value of the property must be zero at zero kelvin.

B. The property must increase with increase of temperature.

C. The property must have a different value at each temperature to be measured.

D. The value of the property must vary linearly with kelvin temperature.

37. Which of the following is not an assumption on which the kinetic model of an ideal gas is

based?

A. All molecules behave as if they are perfectly elastic spheres.


10/12


10

B. The mean-square speed of the molecules is proportional to the kelvin temperature.

C. Unless in contact, the forces between molecules are negligible.

D. The molecules are in continuous random motion.

38. In the circuit below, n charge carriers pass the point P in a time t. Each charge carrier has charge

q.

P

The current in the circuit is given by the expression

A.t

q.

B.t

nq.

C.n

qt.

D. nqt.

39. A weight is suspended from a spring. The variation with weight of the length of the spring is

shown below.16

14

12

100 2 4 6 8

weight / N

length / cm

What is the value of the spring constant (force constant) of the spring?

A. 0.4 N cm1

B. 0.5 N cm1

C. 2.0 N cm1

D. 2.5 N cm1

40. Which one of the following objects is in equilibrium?

A. A stone trapped in the tread of a rotating tyre

B An air molecule as a sound wave passes through the air

C. A steel ball falling at constant speed through oil

D. An electron moving through a metal under the action of a potential difference


11/12


11

These are extra questions for practice as paper has 40 questions. Take five minutes more

than one hour

41. A mass is suspended from the roof of a lift (elevator) by means of a spring balance, as

illustrated below.

lift (elevator)

mass

The lift (elevator) is moving upwards and the readings of the spring balance are noted as

follows.

Accelerating: Ra

Constant speed: Rc

Slowing down: Rs

Which one of the following is a correct relationship between the readings?

A. Ra >Rc

B. Ra =Rs

C. Rc =Rs

D. Rc


12/12


12

43. The diagram shows the pressure/volume (p/V) diagram for one cycle PQRS of an engine.

p

V

Q R

S

P

In which sections of the cycle is work done on the engine?

A. SP only

B. PQ onlyC. SP and PQ only

D. RS and SP only

44. A string is stretched between two fixed points. The string is plucked at its centre and is seen to

vibrate with frequencyfas shown below.

Which one of the following expressions gives the frequencies of other possible modes of

vibration that have an anti node at the centre? The numbern in each expression is an integer.

A. nf

B. (2n 1)f

C. (n 1)f

D. (n + 1)f

45. A substance is heated at a constant rate. The sketch graph shows the variation with time tof the

temperature of the substance.

W

X Y

Z

t=

0 In which region or regions of the graph must there be more than one phase of the substance

present?

A. WX and YZ

B. WX only

C. WX, XY and YZ

D. XY only(1)

Date post:	03-Apr-2018
Category:	Documents
Upload:	dadajee420
View:	229 times
Download:	0 times

Physics 9702 Sample Paper for practice 2013

Documents