**S.B. Roll No………..**

**APPLIED PHYSICS**

**1**

^{st}Exam/Common/5403/0351/Dec’11**Duration: 2**

^{1/2}Hrs. Max. Marks: 75
1. Newton’s
second law of motion connects

a. Momentum
and acceleration

b. Change
of momentum and velocity

c. Rate of
change of momentum and external force

d. Rate of
change of force and momentum

2. A
particle is moving with a constant speed along a straight line path. A force is
not required to

a. Increase
its speed

b. Decrease
its momentum

c. Change
its direction

d. Keep it
moving with the same speed

3. Action
and reaction forces do not balance each other because they

a. Act on
the same body

b. Do not
act on the same body

c. Are in
opposite direction

d. Are not
equal

4. An
athlete runs some distance before taking a long jump so that he may

a. Acquire
large inertia of motion

b. Overcome
inertia of rest

c. Get
inertia of direction

d. Acquired
Kinetic energy

5. A
machine guns fires a bullet of mass 40gm with velocity 1200ms

^{-1. }The person holding^{ }it can apply a maximum force of 144 Newton on the gun. The maximum number of bullets that can be fired per second in
a. 3

b.4

c.5

d. 7

6. A
force of 5N acts on a body of weight 9.8N. What is the acceleration produced in
M/s

^{2}.
a. 49.0

b. 1.96

c.5.0

d.0.51

7.
The limiting friction between two bodies in contact independent of

a.
nature of surfaces in contact

b.
the area of surfaces in contact

c.
normal reaction between the surfaces

d.
all of the above

8.
The Kinetic friction is always

a.
less than rolling friction

b.
equal to rolling friction

c.
greater than rolling friction

d.
may be less than greater or equal to rolling friction

9.
A force of 98N is required to pull a body of mass 100Kg over ice. The
coefficient of friction is

a.
0.1

b.
0.8

c.
0.98

d.
cannot be determined

10.
The energy stored in a watch spring is

a.
Kinetic energy

b.
potential energy

c.
heat energy

d.
chemical energy

11.
A motor boat is travelling with a speed of 30ms

^{-1}. If the force on it due to water flow is 500N, the power of the boat is
a.
150KW

B.
1.5K

C.
15K

D.
150W

12.
Nms

^{-1}is the unit of
a.
impulse

b.
power

c.
energy

d.
work

13.
When the force retards the motion of a body the work done is

a.
zero

b.
negative

c.
positive

d.
+ve or –ve depending upon situation

14.
If the momentum of a body is doubled the Kinetic energy is

a.
halved

b.
unchanged

c.
doubled

d.
increased four time

15.
A body falling from a height of 10m rebounds from the floor. If it loses 2% of
energy in the impact, how high will it rebound?

a.
10m

b.
8m

c.
12m

d.
none of the above

16.
A uniform force of 4N acts on a body of mass 8kg for a distance of 2.0m. The
K.E. required by the body is

a.
8J

b.
64J

c.
4j

d.
16J

17.A
force F along on a body moving in a circle of radius r is always perpendicular
to the instantaneous velocity u. The work done by the force on the body in one
complete revolution is

a.
Fv

b.
Fr

c.
F.2

d.
0

18.
Watt day is the unit of

a.
power

b.
energy

c.
force

d.
none

19.
A hollow sphere and a solid sphere of same mass and radius are allowed to roll
down an inclined plane from same height simultan-eously. Which will read the
bottom first

a.
hollow sphere

b.
solid sphere

c.
both together

d.
none of the above

20.
Mass in linear motion has its analog in rotational motion

a.
moment of inertia

b.
angular momentum

c.
torque

d.
weight

21.
Weight of force is called

a.
torque

b.
weight

c.
moment of inertia

d.
angular momentum

22.
Moment of inertia is independent of

a.
Mass of the body

b.
shape of the body

c.
location of axis of rotation

d.
torque on the body

23.
If earth shrinks suddenly to half of its present radius without change in mass,
the duration of the day will be

a.
24 hours

b.
6 hours

c.
96 hours

d.
12 hours

24.
A boy suddenly comes and sits on a circular rotating table. What will remain
conserved?

a.
linear momentum

b.
Kinetic energy

c.
angular momentum

d.
none of these

25.
When the spring is loaded, the strain produced is

a.
longitudinal

b.
volumetric

c.
shearing

d.
none

26.The
property of metals which allows them to be drawn into thin wires beyond their
elastic limit without rupture is called

a.
ductibility

b.
elasticity

c.
malleability

d.
hardness

27.
In steel the Young’s modulus and the strain at the breaking point are 2x10

^{11 }Nm^{-2 }and 0.15 respectively. The stress at the breaking point for steels is therefore
a.
1.33x 10

^{11}Nm^{-2}
b.
7.5 x 10

^{-3}Nm^{-2}
c.
1.33x 10

^{12}Nm^{-2}
d.
3x 10

^{10}Nm^{-2}
28.
If the temperature of a liquid is raised, then its surface tension is

a.
decreased

b.
increased

c.
irregular

d.
equal to viscosity

29.
Due to capillary action a liquid will fall in a tube, if the angles of contact
is

a.
acute

b.
obtuse

c.
90

^{O}
d.
zero

30.
The CGS unit of coefficient of viscosity is

a.
poise

b.
newton

c.
Kg-m

^{-1}s^{-1}
d.
gs/cm

^{-1}
31.
The clouds float in atmosphere because of

a.
their low temperature

b.
their low viscosity

c.
their low density

d.
creation of low pressure

32.
Unit of modulus of elasticity is

a.
dyne/cm

b.
dyne/cm

^{2}
c.
dyne-cm

d.
dynes

33.
The menisas of mercury in a capillary tube is

a.
convex

b.
concave

c.
plane

d.
uncertain

34.
Hooke’s law essentially defines

a.
stress

b.
strain

c.
field point

d.
elastic limit

35.
Which one of the following quantities does not have the unit of force per unit
area

a.
stress

b.
strain

c.
Young’s modulus of elasticity

d.
pressure

36.
Water is flowing through a tube of non-uniform cross-section. If the ration of
the radius of the tube at the entrance and exist is 3:2 then the ratio of velocity
of liquid entering and leaving the tube is

a.
8:27

b.
4:9

c.
1:1

d.
9:4

37.
Soap helps in better cleaning of clothes because

a.
it reduces the surface tension of solution

b.
it gives strength of solution

c.
it absorbs the dirt

d.
chemical of soaps change

38.
The temperature of a gas is a measure of

a.
the average Kinetic energy of gaseous molecules

b.
the average potential energy of gaseous modulus

c.
the average distance between the molecules of the gas

d.
the size of the molecules of the gas

39.The
temperature of a patient of 40

^{O}C, his temperature of Fahrenheit scale will be
a.
104

^{O}F
b.
72

^{O}F
c.
96

^{O}F
d.
100

^{O}F
40.
When water is heated from 0

^{O}C^{ }to 100^{O}C its volume
a.
increases

b.
decreases

c.
remains unchanged

d.
first decreases and then increases

41.
Mercury thermometers can be used to measure temperature upto

a.
100

^{O}C
b.
212

^{O}C
c.
500

^{O}C
d.
360

^{O}C
42.
If a bimetallic strip is heated it will

a.
twist itself into a helix

b.
not bend at all

c.
bend towards the metal with lower thermal expansion coefficient

d.
bend towards the metal with higher thermal expansion coefficient

43.
The process by which sun’s rays reach the earth is

a.
radiation

b.
conduction

c.
convection

d.
diffusion

44.The
velocity of heat radiation in vacuum is

a.
equal to that of light

b.
less than that of light

c.
greater than that of light

d.
equal to that of sound

45.
By increasing the temperature of liquid is

a.
volume and density decrease

b.
volume and density increase

c.
volume increases and density decreases

d.
volume decreases and density increases

46.
In Searle’s method for finding conductivity of metals, the temperature gradient
along the bar

a.
is greater near the hot end

b.
is greater near the cold end

c.
is same at all points along the bar

d.
volume decreases and density increases

47.
The thermometer suitable to measure 2000

^{O}C is
a.
gas thermometer

b.
mercury thermometer

c.
vapour-pressure thermometer

d.
total radiation pyrometer

48.
A piece of ice at 0

^{O}C is put into a vessel containing water at 0^{O}C. The ice will
a.
melt

b.
slightly melt

c.
not melt

d.
vanish in no time

49.
Two bodies are said to be in thermal equilibrium if they have the same

a.
temperature

b.
amount of heat

c.
specific heat

d.
thermal capacities

50.
The transmission by conduction is most prominent in

a.
liquids

b.
solids

c.
gases

d.
liquids and gases

51.
A person of mass 60Kg climbs up 20m long staircase to the top of a building 10m
high. If g=10ms

^{-2}what is the work done by him?
a.
3KJ

b.
6KJ

c.
12KJ

d.
24KJ

52.
A body measures 8N in air and 5N in water. The buoyant force is

a.
3N

b.
13N

c.
8N

d.
5N

53.
A body floats in a liquid contained in a breaker. The whole system is falling
under gravity, the upthrust on the body due to liquid is

a.
zero

b.
equal to weight of body in air

c.
equal to weight of liquid displaced

d.
equal to weight of impressed part of the body

54.
The minimum resultant of two forces 4N and 3N is

a.
7N

b.
4N

c.
3N

d.
1N

55.
If F=8i-2j and 4=6^+8k^ then F.r will be

a.
6 units

b.
8 units

c.
32 units

d.
48 units

56.
Dimensions of impulse are

a.
[ML

^{-1}T^{-2}]
b.
[MT

^{-2}]
c.
[MLT

^{-1}]
d.
[ML

^{-1}T^{-3}]
57.
Which of the following has the smallest value?

a.
Fermi

b.
millimeter

c.
angstrom

d.
micron

58.
The radius of a sphere is 5cm. Its volume will be given by

a.
523.33cm

^{3}
b.
5.0 x10

^{2}cm^{3}
c.
5.23x10

^{2}cm^{3}
d.
5x10

^{2}cm^{3}
59.
The error in the measurement of radius of sphere is 0.3%. What is percentage
error in measurement of its volume?

a.
0.3%

b.
0.9%

c.0.6%

d.4/3

^{3}
60.An
experiment measures quantities a,b,c and X is calculated from the formula X=ab

^{2}/c^{3}. The percentage errors in a,b,c are respectively. The percentage error in x can be
a.
13%

b.4%

c.7%

d.
.1%

61.
If f=x

^{2}, then the relative error in f is
a.

b.(

^{2}/x
c.
.(

^{2}
d.

62.The
density of the material of a cube is measured by measuring its mass and length
of its sides, if the maximum errors in the measurement of mass and the length
are 3% and 2% respectively, the maximum error in the measurement of density is

a.1%

b.9%

c.5%

d.7%

63.
The significant figures in 0.009 is

a.
1

b.3

c.2

d.4

64.
The velocity ‘v’ of a particle is given in terms of time ‘t’ as v=at+

The
demsions of a,b,c are

a.[L

^{2}][T][LT^{-2}]
B.[LT

^{-2}][L][T]
C.[LT

^{-2}][LT][L]
D.[L][LT][T

^{2}]
65.
The dimensions of quantities in one or more pairs of the following are same.
Identify the pair

a.
torque and force

b.
angular momentum and work

c.
energy and Young’s modulus

d.
light year and wave length

66.
Checking the correctness of equation using the method of dimensions is based on

a.
equality of inertial frames of reference

b.
the types of system of units

c.
principle of homogeneity of dimensions

d.
none of these

67.
[M

^{1}L^{2}T^{-2}] represents
a.
force

b.
pressure

c.
work

d.
Planck’s constant

68.
Which of the following quantities is a scalar?

a.
mass

b.
velocity

c.
momentum

d.
displacement

69.
The minimum number of vectors of unequal magnitude required to produce zero
resultant is

a.
2

b.3

c.4

d.
more than 4

70.
Two vectors A and B obey the relation A+B=A-B and is angle between them, then

a.=120

^{O}
b.
B=0

c.
90

^{O}
d.
A=0

71.
Two vectors A and B are A=2i^+5k^ and B=3j^+4k^ their scalar product is

a.
20

b.5

c.
23

d.26

72.
The condition of vectors A and B to be perpendicular is

a.
A.B=1

b.
AxB=0

c.
A.B=0

d.
AxB=1

73.
Given A=5i^+7j^-3k^ and B=2i^+2j^-mk^. If A and B are perpendicular vectors,
then value of m is

a.
-2

b.
-7

c.
8

d.-8

74.
A vehicle is moving with a uniform speed ‘v’ on a curved road of width ‘b’ and
radius of curvature ‘R’. For providing the centripetal force to the vehicle,
the angle of elevation required between the outer and inner edges of the road
is

a.
tan

b.
tan

c.
tan

d.
tan

75.Two
cars of masses M

_{1}and M_{2}are revolving with same speed on circular paths of radii r_{1}and r_{2}respectively. The ratio of their centripetal accelerations will be
a.

b.

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