PHYSICS EXAM
1.
Which of the following is correct if ‘m’ is the magnitude and ‘u’ is
the unit
A.
mu = constant
B.
m1u1 = m2u2
C.
m α u
D.
All the above.
2.
If the pitch of a screw is 1 mm and its circular scale
is divided into 100 equal parts, its least count is
A. 1000
micrometer
B. 100
micrometer
C.
10 micrometer
D. 0.1
micrometer
3.
The mass of a body is (50±0.5) gram. The percentage
error in measurement of mass is
A. 0.5%
B. 1%
C.
2%
D. 4%
4.
Four balls are projected with the same initial speed at upward angles
200, 300, 400 and 600 to the
horizontal. The ball which strikes the ground first is
A.
4th ball
B.
3rd ball
C.
2nd ball
D.
1st ball
5.
The length of a right cylinder increases due to
heating by 1%. Then its base area will increase by
A. 1%
B. 2%
C.
3%
D. 4%
6.
The number of significant figures in 0.0092 is
A. 4
B. 3
C.
2
D. 1
7.
The quantity that remains constant in projectile motion is
A.
KE
B.
PE
C.
Momentum
D.
acceleration
8.
A stone is projected with a velocity 100m/s at an angle 300
to the horizontal. The time to reach the highest point is
A.
10s
B.
20s
C.
5s
D.
2.5s
9.
A projectile is projected at an angle A. If the maximum height
reaches is ¼th the horizontal range, then tan A
A.
1
B.
2
C.
3
D.
4
10.
If the maximum horizontal range is 100m, the maximum height reached
during the throw is
A.
100m
B.
50m
C.
25m
D.
12.5m
11.
When the angle of projection is A, the range is R. when the
angle of projection is doubled the range is
A.
2R
B.
2RcosA
C.
2RsinA
D.
2Rcos2A
12.
After time t the height y of a projectile is y = 4t – 5t2
and horizontal distance x = 3t. if g = 10m/s2, the velocity of
projectile at the starting point is
A.
7m/s
B.
1m/s
C.
12m/s
D.
5m/s
13.
A projectile is projected at an angle of projection tan-1 (4/3).
The ratio of its horizontal range to the greatest height reached is
A.
2:1
B.
3:1
C.
4:1
D.
5:1
14.
A body is projected at an angle such that KE at the highest point is
reduced to half the KE at the point of projection. The angle of projection is
E.
300
F.
450
G.
600
H.
750
15. An aircraft
has a takeoff velocity `80 km/hr. the length of runway needed if the aircraft’s
average acceleration along the ground is 2.5 m/s2 will be
A.
100m
B.
150m
C.
320m
D.
500m
16.
An aircraft has a takeoff velocity `80 km/hr. the length of runway
needed if the aircraft’s average acceleration along the ground is 2.5 m/s2
will be
E.
100m
F.
150m
G.
320m
H.
500m
17.
A sprinter has a maximum speed of 10 m/s and reaches that speed by an
acceleration of 2.5 m/s2. The time he takes to run 100m is
A.
12s
B.
14s
C.
16s
D.
10s
18.
A body of mass 1kg at rest is acted on by a force and the distance
moved by the body is given by the equation S =6t2. The work done by
the force in 3 seconds is
A.
188 J
B.
576 J
C.
144 J
D.
648 J
19.
A 120m long train is moving west at a speed of 10 m/s. a small bird
flying east at a speed of 5 m/s crosses the train. The time taken by the bird
to cross the train will be
E.
4s
F.
8s
G.
12s
H.
24s
20.
The position of a particle at time t is given by x = 2 + 3t + 4t2 .
then the particle is moving with
I.
uniform acceleration
J.
uniform velocity
K.
variable acceleration
L.
Variable velocity.
21.
A body starting from rest slides down an inclined plane of length L and
reaches the foot of the plane with a speed of 10m/s. if the length of the plane
is doubled the velocity on reaching the ground is
A.
10m/s
B.
14.1m/s
C.
17.3m/s
D.
20m/s
22.
From a balloon ascending vertically with a velocity 29.4 m/s a stone is
dropped when it is at height of 78.4m. the time taken by it to reach the ground
is
A.
2s
B.
4s
C.
6s
D.
8s
23.
If the resultant of two forces F and F is equal to √2F, the angle between them is
E.
0
F.
45
G.
90
H.
180
24.
Of the following forces the set which will not definitely keep a body
in equilibrium is the set
A.
5, 10, 12
B.
5, 6, 12
C.
8, 7, 12
D.
4, 5, 6
25.
If A = 4i + 4j + 4k and B = 3i + j -4k, then the angle between vectors
A and B is
A.
0
B.
45
C.
90
D.
180
26.
If A = 2i – 2j +k and B = 3i + 5j + µk are perpendicular to each other
then µ is given by
A.
0
B.
12
C.
14
D.
4
27.
If a particle moves in a circle, describing equal angles in equal
intervals of time, its linear velocity vector
A.
Remains constant
B.
Changes in magnitude
C.
Changes in direction
D.
Changes both in magnitude and direction
28.
The earth makes one revolution about its axis in 24 hours. The
centripetal acceleration of a point on its equator is nearly
A.
340 cm/s2
B.
3.4 cm/s2
C.
34 cm/s2
D.
0.34 cm/s2
29.
A wheel with radius 5 cm rotates so that the relationship between the
angle of the rotation of the wheel, radius and time is described by the
equation Θ = A + Bt + Ct2 +Dt3, where D = 1 rad/s3 .
the change in tangential acceleration during each second of the motion for the
point on the rim is
A.
0.3 m/s2
B.
3 m/s2
C.
0.03 m/s2
D.
0.08 m/s2
30.
When a bullet of mass 5kg is fired, the impulse on it is 200 Ns. If the
mass of the gun is 10kg, then the recoil velocity of the gun is
A.
20 m/s
B.
2 m/s
C.
0.2 m/s
D.
0.02 m/s
31.
A particle is moving with a constant speed along straight line path. A
force is not required to
A.
Increase the speed
B.
Decrease the momentum
C.
Change the direction
D.
Keeps it moving with uniform velocity.
32.
Two blocks of mass 4 kg and 6 kg are placed along a smooth horizontal
surface. If we apply a push of 5N on the heavier mass, the force on the lighter
mass will be
A.
5N
B.
4N
C.
3N
D.
2N
33.
A fireman wants to slide down a rope. The breaking force for the rope
is ¾ of the weight of the man. The minimum acceleration with which the fireman
should slide down is
A.
¼ g
B.
½ g
C.
¾ g
D.
Zero
34.
A rain drop of mass 0.1g is falling with uniform speed of 10m/s. the
net force acting on the drop is
A.
Zero
B.
2 X 10-3 N
C.
10-3 N
D.
10-2
35.
A body at rest may have
A.
Energy
B.
Momentum
C.
Speed
D.
Velocity
36.
A light and heavy body has equal KE. Which one has a greater momentum
A.
The light body
B.
The heavy body
C.
Both do have the same
D.
The data given is incomplete
37.
Two masses of 1g and 4g are moving with equal KEs. The ratio of the
magnitudes of their linear momentum is
A.
4:1
B.
√2:1
C.
1:2
D.
1:16
38.
A pump motor is used to deliver water at a certain rate from a given
pipe. To obtain twice as much water from the same pipe in the same time power
of the motor have to be increased to
A.
2 times
B.
4 times
C.
8 times
D.
75 times
39.
A bullet fired at a target 80m/s and penetrates 50cm into it. If the bullet
were fired into a target 25cm thick with equal velocity with what velocity
would it emerge, suppose the resistance to be uniform and the same in both the
cases
A.
√30m m/s
B.
10/√2 m/s
C.
40 m/s
D.
40√2 m/s
40.
A boy pulls a chain of mass M and length L hanging vertically downwards
from a roof top. The workdone by him is
A.
½MgL
B.
MgL
C.
½ MgL2
D.
MgL2
41.
A bag of sand of mass M is suspended by a string. A bullet of mass m is
fired at it with velocity v and gets embedded into it. The loss of KE in this
process is
A.
½ mv2 x 1/(M + m)
B.
½ mv2
C.
½ mv2 x M/(M + m)
D.
½ mv2 x M/m
42.
If the KE of a body is increased by 300%, its momentum will increase by
A.
100%
B.
150%
C.
√300%
D.
175%
43.
If a shell fired from a cannon explodes in midair, its total
A.
Momentum increases
B.
Momentum decreases
C.
KE increases
D.
KE remains unchanged
44.
Which of the following is different from others
A.
Watt sec
B.
Coulomb Volt
C.
Newton meter
D.
Coulomb Farad
45.
Power is given by product of
A.
Force and Velocity
B.
Work and time
C.
Force and displacement
D.
Work and displacement
46.
MKS unit of gravitational constant is
A.
Nm2/kg2
B.
N/kgm2
C.
Nm/kg
D.
N2m/kg2
47.
A satellite is orbiting around the earth in a circular orbit. It moves
with
A.
Constant speed
B.
Constant acceleration
C.
Constant angular acceleration
D.
None of the above
48.
A body is projected into space from the earth’s surface with escape velocity.
At the time of projection its total energy will be
A.
PE
B.
KE
C.
Partially PE and partially KE
D.
Half KE and half PE
49.
Unit masses 1kg each are placed at 1m, 2m, 4m, 8m, ……. From a point 0.
The gravitational field due to this distribution of masses at 0 is. ( G is
universal gravitational constant)
A.
4/3 G
B.
¾ G
C.
2G
D.
Infinite
50.
A solid sphere rolls on a horizontal table. Then the ratio of its
rotational KE to its total energy
A.
1:2
B.
1:1
C.
2:5
D.
2:7
51.
A stone of mass 4kg is whirled in a horizontal circle of radius 1m and
makes 2rev/sec. the angular momentum of the stone about the axis of rotation is
A.
320J
B.
640J
C.
160J
D.
80J
52.
The unit of torque will be
A.
Kgm2/sec2
B.
Kg m
C.
Kg m/sec2
D.
Kg / m2sec2
53.
Two discs have same mass and thickness. Their materials are of
densities d1 and d2. The ratio of their moment of inertia
about central axis will be
A.
d1 : d2
B.
d1d2 : 1
C.
1 : d1 d2
D.
d2 : d1
54.
fly wheel is an important part of steam engine because
A.
it accelerates the speed of engine
B.
if gives strength to the engine
C.
it decreases the moment of inertia
D.
it helps the engine in keeping the speed uniform
55.
If a gymnast sitting on a rotating stool, with his arms outstretched
suddenly lowers his arms then
A.
The angular velocity decreases.
B.
The moment of inertia decreases.
C.
The angular velocity remains constant
D.
The angular momentum increases.
56.
The angular velocity of second’s hand of a clock is
A.
60 rad/s
B.
2π rad/s
C.
π/60 rad/s
D.
π/30 rad/s
57.
if the earth suddenly contracts to half of its radius without change in
its mass, the length of the day will become
A.
6 hours
B.
96 hours
C.
48 hours
D.
24 hours
58.
The separation between carbon and oxygen molecules in CO is 1.2A. what is the distance of centre of mass from
carbon atom
A.
0.51A
B.
0.69A
C.
0.91A
D.
0.43A
59.
Match the following
|
1Chadwick
|
AEM theory
|
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2Maxwell
|
BNeutron
|
|
3Hess
|
CWeak EMI interaction.
|
|
4Abdusalam
|
DCosmic Rays
|
A.
1A,2B,3C,4D
B.
1B,2C,3D,4A
C.
1B,2A,3D,4c
D.
1B,2C,3A,4D
60.
Match the following
|
1Cyclotron
|
ALawrence
|
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2Transistor
|
BBardeen
|
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3Natural radioactivity
|
CBequerel
|
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4Electron
|
DThomson
|
A.
1c,2a,3b,4d
B.
1a,2b,3c,4d
C.
1b,2a,3c,4d
D.
1d,2c,3a,4b
Answers
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1
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31
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2
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32
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3
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33
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34
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5
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35
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36
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37
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8
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38
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9
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39
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10
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40
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11
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41
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12
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42
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13
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43
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14
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44
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45
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46
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47
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18
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48
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19
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49
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20
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50
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21
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51
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22
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52
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23
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53
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24
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54
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25
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55
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26
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56
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27
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57
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58
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59
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30
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60
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Correct Key
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1
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31
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2
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32
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3
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33
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4
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34
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5
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35
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6
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36
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7
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37
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8
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38
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9
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39
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10
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40
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11
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41
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12
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42
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13
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43
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14
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44
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15
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45
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16
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46
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17
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47
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18
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48
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19
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49
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20
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50
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21
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51
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52
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23
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53
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24
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54
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25
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55
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26
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56
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27
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57
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28
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58
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29
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59
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30
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60
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