anderson junior college

88 Pages·2014·3.92 MB·English

1 PDG

Candidate Name ( )

ANDERSON JUNIOR COLLEGE

2014 JC2 Preliminary Examination

PHYSICS 9646/01
Higher 2
Paper 1 Multiple Choice Tuesday 2 September 2014

1 hour 15 minutes

Additional Materials: Multiple Choice Answer Sheet

READ THESE INSTRUCTIONS FIRST

Write in soft pencil.
Do not use staples, paper clips, highlighters, glue or correction fluid.
Write your name, PDG and NRIC/FIN and shade the 7 digits of your NRIC/FIN in soft pencil on the Multiple
Choice Answer Sheet.

There are forty questions in this section.

Answer all questions.

For each question there are four possible answers A, B, C and D.

Choose the one you consider correct and record your choice in soft pencil on the separate Multiple

Choice Answer Sheet.

\
Read the instructions on the Answer Sheet very carefully.

Each correct answer will score one mark. A mark will not be deducted for a wrong answer.
Any rough working should be done in this question paper.
The use of an approved scientific calculator is expected, where appropriate.
This document consists of 19 printed pages and 1 blank page
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Data

speed of light in free space, c = 3.00 x 108 m s-1

permeability of free space,  = 4 x 10-7 H m-1
0

permittivity of free space,  = 8.85 x 10-12 F m-1
0

(1/(36)) x 10-9 F m-1

elementary charge, e = 1.60 x 10-19 C

the Planck constant, h = 6.63 x 10-34Js

unified atomic mass constant, u = 1.66 x 10-27 kg

rest mass of electron, m = 9.11 x 10-31 kg
e

rest mass of proton, m = 1.67 x 10-27 kg
p

molar gas constant, R = 8.31 J K-1 mol-1

the Avogadro constant, N = 6.02 x 1023 mol-1
A

the Boltzmann constant, k = 1.38 x 10-23 J K-1

gravitational constant, G = 6.67 x 10-11 N m2 kg-2

acceleration of free fall, g = 9.81 m s-2

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Formulae
uniformly accelerated motion, s = ut + ½ at2

v2 = u2 + 2as

work done on/by a gas, W = pV

hydrostatic pressure, p = gh

gravitational potential, -Gm


r

displacement of particle in s.h.m., x = x sin t
0

velocity of particle in s.h.m., v = v cos t
0

 x 2 x2
0

mean kinetic energy of a molecule of an ideal gas 3
E = KT
2

resistors in series, R = R + R + …
1 2

resistors in parallel, 1/R = 1/R + 1/R + …
1 2

electric potential, Q
V =
4 r
0

alternating current/voltage, x = x sin t
0

transmission coefficient, T  exp(-2kd)

82mUE
where k =
h2

radioactive decay, x = x exp(- t)
0

decay constant, 0.693
=
t
1
2

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1 Which of the following pairs of physical quantities are both vector quantities?

A work done, electric current
B work done, electric field strength
C force, electric current
D force, electric field strength

2 The diameter D of a sphere is measured to be 5.0 cm with a fractional uncertainty of 0.02.
What is the absolute uncertainty and fractional uncertainty of the radius R of the sphere?

absolute fractional uncertainty

uncertainty of R of R
A 0.05 cm 0.01
B 0.1 cm 0.01
C 0.05 cm 0.02
D 0.1 cm 0.02

3 The precision and accuracy of a measurement is affected by:

precision accuracy
A Systematic error Random error
B Random error Random error
C Systematic error Systematic error
D Random error Systematic error

4 A golf ball travels with an initial speed v and it went only one-third of the way to the hole.
o
Assuming the force of resistance due to the grass remains the same, what new initial speed
should the ball travel for the ball to go into the hole?

A vo B vo C vo D 3vo

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5 The graph is a displacement-time (s-t) graph for a tennis ball during part of a game.
Which part of the graph shows the highest speed?
s
A C
D
B
t

6 The diagram shows a trolley moving on a frictionless horizontal table at a speed of
0.5 m s─1. 500 g of sand is then released onto the trolley.
500 g of sand
0.5 m s─1

What is the change in the momentum of the trolley?

A zero B 0.15 N s C 0.20 N s D 1.80 N s

7 A pole of weight W is attached to a wall. It is held horizontal by a wire attached at point X of
the pole where T is the force of the wire. The pole experiences a reaction force R from the
wall.

wire

pole
wall

X

Which triangle of forces could correctly represent the three forces acting on the pole?

A B C D

R
R W R

R
W
W T
W
T
T T

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8 A ball bearing was released from rest in a viscous liquid. Which of the following graphs
would represent the variation of the forces acting on the ball bearing with time?
A B
force weight force weight

viscous viscous
force force
upthrust
upthrust

0 0
0 time 0 time

C D
force weight force weight

viscous
viscous

force
force

upthrust upthrust

0 0
0 time 0 time

9 A man lifts a 10 kg sack of rice from a ground to above his head using his both hands. The
sack of rice does not experience a change in kinetic energy between the two positions.
Which of the following statement is correct?
A The work done on rice sack by gravity is less than the work done on rice sack by man.
B The work done on rice sack by gravity is more than the work done on rice sack by man
C The work done on rice sack by gravity is equal to the work done on rice sack by man.
D There is no work done on the rice sack.

10 A motor driving a pump raises 0.10 m3 of water through a vertical height of 5.0 m in a time of
10 minutes.
If the efficiency of the pump is 60%, what is the power generated by the motor? (Take the
density of water to be 1000 kg m─3)
A 4.9 W B 8.2 W C 14 W D 82 W

11 A body of mass m moves in a horizontal circle of radius r at constant speed v for one
complete revolution.
Which of the following statements is incorrect?
A The angular velocity of body is directed perpendicular to the plane of circular motion.
B The work done by the centripetal force is 2mv2.
C The change in linear momentum of the body is zero.
D The total energy of the body is constant.
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12 A straight length of tape unwinds from a roll rotating about a fixed axis with constant angular
velocity, the radius of the roll decreasing at a steady rate.

v
radius

Which of the following graphs correctly shows how the variation of speed v at which the tape
moves away from the roll with time t?

A B C D
v v v v

t t t t

13 The gravitational potential at point X due to the Earth is 7.2 kJ kg1. At point Y, the
gravitational potential is 3.4 kJ kg1.

Earth

X Y

7.2 kJ kg1 3.4 kJ kg1

The change in gravitational potential energy of a 4.0 kg mass when it is moved from X to Y
is

A 42.4 kJ B 10.6 kJ C +3.8 kJ D +15.2 kJ

14 Two satellites, A and B, orbiting around Earth have the same kinetic energy. Satellite A has
a larger mass than satellite B. Which of the following statements is correct?

A Satellite A has the same total energy as satellite B.

B Satellite A has a smaller orbital radius than satellite B.

C Satellite A has a smaller period than satellite B.

D Satellite A has a larger angular velocity than satellite B.

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15 A body moves with simple harmonic motion about a point P. The graph shows the variation
with time of its displacement from P.

displacement / m
1.0
0.5
0
0 0.2 0.4 0.6 0.8 time / ms
─0.5
─1.0

What is its angular frequency?

A 1.6 × 10-3rad s─1 B 4.0 × 10-3rad s─1 C 4.0 × 103rad s─1 D 2.5 × 104rad s─1

16 Two horizontal springs are attached to a trolley. The trolley is then displaced along the axis
of the springs and then released. The trolley undergoes simple harmonic motion. The
variation of the kinetic energy E of the trolley with horizontal displacement x from its
K
equilibrium position is shown in the figure below.

80

70

60

50

40

30

20

10

─ 3 ─ 2 ─ 1 0 1 2 3
x/cm

The trolley loses energy so that its maximum kinetic energy is reduced by 50 mJ. What is
the amplitude of the oscillations?

A 2.4 cm B 1.9 cm C 1.4 cm D 0.95 cm

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17 Two bulbs X and Y containing air at different pressures are connected by a tube P which
contains two mercury threads.

h h h and h are
1 2 1 2
not to scale

The density of mercury is 13 600 kg m─3.
Which pair of values of h and h is possible?
1 2
h / cm h / cm
1 2
A 2.0 8.0
B 4.0 2.0
C 6.0 6.0
D 8.0 2.0

18 The intensity of a progressive wave, besides being dependent on the amplitude of the wave,
is also proportional to the square of the frequency.
The diagram shows two waves X and Y.
displacement
2a wave X
a
wave Y time

The intensity of wave X is I .
0
What is the intensity of wave Y?
A 0.028 I B 0.11 I C 0.44 I D 2.25 I
0 0 0 0

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19 The diagram shows an ice cube floating in water.

Both the ice cube and the water are at 0 °C.
Which statement correctly compares the molecular properties of the ice and those of the
water?
A The mean kinetic energies are the same for both the ice molecules and the water
molecules.

B The mean inter-molecular separations are the same for both the ice and the water.

C The mean inter-molecular potential energies are the same for both the ice molecules
and the water molecules.

D The mean total energies are the same for both the ice molecules and the water
molecules.

20 Polaroids P, Q and R are aligned such that the axes of polarisation of P and Q are aligned
to each other and the axis of polarisation R is perpendicular to that of P and Q as shown.
θ
light
Observer
P Q R

Polaroid Q is then rotated about its centre through an angle θ until its axis of polarisation is
aligned with that of R.
Which of the following describes the change in light intensity seen by the observer?
A Light intensity remains zero all the time.
B Light intensity was maximum initially and decreases to zero.
C Light intensity decreases to zero and then increases back to maximum.
D Light intensity increases to maximum and then decreases back to zero.

9646/01/AJC2014/Prelim