**S.B. Roll No………..**

**APPLIED PHYSICS**

**1**

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

^{1/2}Hrs. Max. Marks: 75
1. Weight
of force is called

a. Torque

b. Weight

c. Moment of
inertia

d. Angular
momentum

2. Moment
of inertia is independent of

a. Mass of
body

b. Shape of
body

c. Location
of axis of rotation

d. Torque
on the body

3. 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

4. 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

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

a. Longitudinal

b. Volumetric

c. Shearing

d. None

6. 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

7. 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. 1.33x10

^{11}Nm^{-2}
b. 7.5x10

^{-3}Nm^{-2}
c. 1.33x10

^{12}Nm^{-2}
d. 3x10

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

a. Decreased

b. Increased

c. Irregular

d. Equal to
viscosity

9. 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

10.
The CGS
unit of coefficient of viscosity is

a. Poise

b. Newton

c. Kg-m

^{-1}s^{-1}
11.
The clouds float in atmosphere because of

a. Their
low temperature

b. Their
low viscosity

c. Their
low density

d. Creation
of low pressure

12.
The menisas of mercury in a capillary tube is

a. Convex

b. Concave

c. Plane

d. Uncertain

13.
Hooke’s law essentially defines

a. Stress

b. Strain

c. Field
point

d. Elastic
limit

14.
Unit of
modulus of elasticity is

a. Dyne/cm

b. Dyne/cm

^{2}
c. Dyne-cm

d. Dynes

15.
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

16.
Water is flowing through a tube of non-uniform
cross-section. If the ratio of the radius of the tube at the entrance and exit
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

17.
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

18.
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

19.
The temperature of a patient is 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
20.
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

21.
Mercury
thermometers can be used to measure a temperature upto

a. 100

^{O}C
b. 212

^{O}C
c. 500

^{O}C
d. 360

^{O}C
22.
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

23.
The process by which sun’s rays reach the earth
is

a. Radiation

b. Conduction

c. Convection

d. Diffusion

24.
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

25.
By increasing the temperature of a liquid is

a. Volume
and density decrease

b. Volume
and density increase

c. Volume
increases and density decreases

d. Volume
decreases and density increases

26.
In
Searle’s method for finding conductivity of metals, the temperature gradient
along the bar

a. Is
greater near the hot end

b. Is great
near the cold end

c. Is same
at all points along the bar

d. Increases
as we go from hot end to cold end

27.
The thermometer suitable to measure 2000

^{O}C is
a. Gas
thermometer

b. Mercury
thermometer

c. Vapour-pressure
thermometer

d. Total
radiation pyrometer

28.
A piece of ice at 0

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

b. Slightly
melt

c. Not melt

d. Vanish
in no time

29.
Two bodies are said to be in thermal
equilibrium if they have the same

a. Temperature

b. Amounts
of heat

c. Specific
that

d. Thermal
capacities

30.
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

31.
A body measures 8N in air and 5N in water. The
buoyant force is

a. 3N

b. 13N

c. 8N

d. 5N

32.
The
transmission by conduction is most prominent in

a. Liquids

b. Solids

c. Gases

d. Liquids
and gases

33.
A body floats in a liquid contained in a
beaker. 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

34.
The minimum resultant of two forces 4N and 3N
is

a. 7N

b. 4N

c. 3N

d. 1N

35.
If F=8i-2j and r=6i^+8k^ then F.R will be

a. 6 units

b. 8 units

c. 32 units

d. 48 units

36.
Dimensions of impulse are

a. [ML

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

^{-2}]
c. [MLT

^{-1}]
d. [ML

^{-1}T^{-3}]
37.
Which of the following has the smallest value?

a.
Fermi

b.
millimeter

c.
angstrom

d.
micron

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

a.
523.33cm

^{3}
b.
5.0x 10

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

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

^{2}cm

^{3}

39. 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.
0.6%

c.0.9%

d.4/3(0.3)

^{3}
40. 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 1%, 3% and 2% respectively. The percentage error in x can be

a. 13%

b.4%

c.7%

d.1%

41. If f=x

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

b. (∆x)

^{2}/x
c. (∆x)

^{2}^{ }d. 2∆x/x

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

a. 1%

b. 9%

c. 5%

d. 7%

43. The significant figures in 0.009 is

a. 1

b.3

c.2

d.4

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

The dimensions 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}]
45. 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

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

a. equality of inertial fames of reference

b. the
types of
system of units

c. principle
of homogeneity of dimensions

d. none
of these

47. [M

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

b. pressure

c. work

d. Planck’s constant

48. Which of the following quantities is a
scalar?

a. mass

b. velocity

c. momentum

d. displacement

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

a. 2

b. 3

c. 4

d. more than 4

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

a.

^{O}
b. B = 0

c.

^{O}
d. A = 0

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

a. 20

b. 23

c. 26

d. 5

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

a. A. B = 1

b. A x B= 0

c. A.B.= 0

d. A x B= 1

53. Give 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

54. 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

55. 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.

56. 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

57. 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

58. 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 directions

d. are not equal

59. 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

60. A machine gun 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

61. 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

62. 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

63. 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

64. 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

65. The energy stored in a watch spring is

a. Kinetic energy

b. potential energy

c. heat energy

d. chemical energy

66. 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. 1.5KW

c. 15KW

d. 150W

67. Nms

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

b. power

c. energy

d. work

68. 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

69. If the momentum of a body is doubled, the
Kinetic energy is

a. halved

b. unchanged

c. doubled

d. increased four time

70. 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

71. A uniform force of 4N acts on a body of
mass 8Kg for a distance of 2.0m.

a. 8J

b. 64J

c. 4J

d. 16J

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

a. Fv

b. Fr

c. F.2

d. 0

73. Watt day is the unit of

a. power

b. energy

c. force

d. none

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

a. hollow sphere

b. solid sphere

c. both together

d. none of the above

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

a. moment of inertia

b. angular momentum

c. torque

d. weight

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