St. Joseph’s Anglo-Chinese School
F5 Physics Enhancement Class Exercise 2009 – 2010
1.
2.
The diagram above shows the variation of the net force acting on an object
which is initially at rest. Which of the following velocity-time graphs correctly
The above graph shows how the square of velocity of an object undergoing
describes the motion of the object ?
uniform acceleration varies with displacement. The object is initially at rest and
travels along a straight line.
A.
B.
C.
D.
The acceleration of the object is
A.
0.5 ms-2
B.
1.0 ms
-2
C.
2.0 ms-2
D.
4.0 ms-2
E.
8.0 ms-2
E.
1
3.
Figure (a) shows a man near the edge of a cliff projecting a stone vertically
upwards. The stone reaches the sea after 18 seconds. Figure (b) shows the
velocity-time graph for the motion of the stone. Find the height of the cliff.
A.
180 m
A force F is applied to a block of mass 1 kg as shown above. The GREATEST
B.
540 m
value of F for the block to remain at rest is 11 N. What would be the motion of
C.
720 m
the block if F is not applied ?
D.
900 m
E.
1620 m
A.
remaining at rest
5.
B.
sliding down with constant velocity
C.
sliding down with an acceleration of 1 ms-2
D.
sliding down with an acceleration of 5 ms-2
E.
sliding down with an acceleration of 6 ms-2
The figure above shows the variation of the force acting on an object. What
4.
physical quantity does the area of the shaded portion represent ?
Figure (a)
Figure (b)
2
A.
Velocity
B.
Acceleration
C.
Momentum
D.
Work
E.
Power
6.
7.
A stone is projected vertically upwards. Neglecting air resistance, which of the
following graphs shows the variation of the kinetic energy of the stone with the
distance travelled during its upward motion ?
A.
B.
C.
D.
The above diagram shows the variation of the acceleration of an object which is
initially at rest. Which of the following velocity-time graphs correctly describes
the motion of the object ?
A.
C.
B.
D.
E.
E.
(B)
(C)
3
8.
An object starts from rest and moves with uniform acceleration along a straight
9.
line. Which of the following graphs concerning the motion of the object is/are
correct ?
(s = displacement, v = velocity, t = time)
(1)
(2)
The above diagram shows the variation of the velocity of an object with time.
(3)
What is the distance travelled by the object in the first 3 seconds ?
A.
(1) only
B.
(3) only
C.
(1) and (2) only
D.
(2) and (3) only
E.
(1), (2) and (3)
(C)
(E)
4
A.
5m
B.
15 m
C.
25 m
D.
30 m
E.
45 m
10.
An object moves with uniform acceleration along a straight line. Which of the
11.
following graphs correctly describe(s) the motion of the object ?
(1)
(2)
Two solid substances X and Y of equal mass are separately heated by two
(3)
identical heaters. The above graph shows the variation of the temperatures of the
substances with time. Which of the following statements is/are correct ?
(1)
The melting point of X is higher than that of Y.
(2)
The specific heat capacity of X is smaller than that of Y.
(3)
The specific latent heat effusion of X is smaller than that of Y.
A.
(1)only
A.
(1) only
B.
(2) only
B.
(3) only
C.
(1) and (3) only
C.
(1) and (2) only
D.
(2) and (3) only
D.
(2) and (3) only
E.
(1), (2) and (3)
E.
(1), (2) and (3)
(D)
(D)
5
12.
Which of the following expressions represents a physical quantity which is
15.
different from the others ?
A.
A particle is released from rest and falls vertically under gravity. If the distance
travelled by the particle in the 1st second is x and that travelled in the 2nd
second is y, find the ratio x :y.
Work
Time
B.
C.
2
A.
1:1
Resistance
B.
1:2
C.
1:3
(Voltage)
Force x velocity
2
D.
(Current) x resistance
D.
1:4
E.
Mass x specific latent heat of fusion
E.
1:5
(C)
(E)
13.
Which of the following physical quantities is not a vector ?
16.
Acceleration
B.
Momentum
C.
Velocity
A. J
D.
Weight
B. N m
E.
Work
C. W s
E. kg m s-2
(E)
14.
Which of the following units does not represent energy ?
A.
(E)
A particle of mass m is thrown vertically upwards with initial speed v When the
particle returns to its starting point, what are the changes in momentum and
kinetic energy of the particle?
Change in momentum
Change in kinetic energy
A.
0
0
B.
0
mv2
C.
mv
½mv2
D.
2mv
0
E.
2mv
mv2
6
17.
18.
At time t = 0, a table–tennis ball is released from a point above the
ground and bounces several times on the ground. The above graph
shows the variation of the velocity v of the ball with time t. (Note:
Velocity pointing upwards is taken to be positive.) At which of the
following points on the graph does the ball reach its maximum
The above graph shows the variation of the temperature of a liquid
height above the ground after the first rebound?
with time when the liquid is heated by a 400 W heater. The mass of
the liquid is 2 kg. Find the specific heat capacity of the liquid.
A. Point P
Assume all the energy given out by the heater is absorbed by the
B. Point Q
liquid.
C. Point R
D. Point S
A. 83 J kg-1 K-1
E. Point T
B. 480 J kg-1 K-1
C. 1 200 J kg-1 K-1
(D)
D. 2 400 J kg-1 K-1
E. 12 000 J kg-1 K-1
(C)
7
19.
20.
(C)
(D)
8
21.
22
(C)
(C)
9
23
(C)
10
24
11
25.
12
Answers
1B
6C
11 D
16 E
21 C
2B
7B
12 E
17 D
22 C
3A
8E
13 E
18 C
23 C
4B
9C
14 D
19 D
5D
10 D
15 C
20 C
24.
13
14
25.
15