**APPLIED PHYSICS**

**1**

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

^{1/2}Hrs. Max. Marks: 75
1. 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
2. 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

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

a. radiation

b. conduction

c. convection

d. diffusion

4. 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

5. 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

6. 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. increases as we go from
hot end to cold end

7. The thermometer suitable
to measure 2000

^{o}C is
a. gas thermometer

b. mercury thermometer

c. vapour-pressure
thermometer

d. total radiation pyrometer

8. 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

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

a. temperature

b. amounts of heat

c. specific heat

d. thermal capacities

10. The transmission by
conduction is most prominent in

a. liquids

b. solids

c. gases

d. liquids and gases

11.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

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

a.3N

b. 13N

c. 8N

d. 5N

13. 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

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

a. 7N

b. 4N

c. 3N

d. 1N

15. 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

16. Dimensions of impulse are

a. [ML

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

^{-2}]
c. [MLT

^{-1}]
d. [ML

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

a. Fermi

b. millimeter

c. angstrom

d. micron

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

a. 523.33cm

^{3}
b. 5.0x10

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

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

^{2}cm^{3}
19. 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. 4/3Ï€(0.3)

^{3}
20. 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.

b. 4%

c.7%

d.1%

21. 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 are
3% and 2% respectively, the maximum error in the measurement of density is

a. 1%

b. 9%

c. 5%

d. 7%

22. 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

23. The significant
figures in 0.009 is

a. 1

b. 3

c. 2

d. 4

24. 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. [LT0

^{2}][L][T]
c. [LT

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

^{2}]
25. 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
modules

d. light year and wave
length

26.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

27. [ML

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

b. pressure

c. work

d. Planck’s constant

28. Which of the
following quantities is a scalar?

a. mass

b. velocity

c. momentum

d. displacement

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

a. 2

b. 3

c. 4

d. more than 4

30. 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

31. 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

32. 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

33. 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

34. 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

35. 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.

36. 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

37. 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

38. 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

39. 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

40. 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

41. 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

42. 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

43. 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

44. 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

45. The energy stored in a watch spring is

a. Kinetic energy

b. potential energy

c. heat energy

d. chemical energy

46. 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

47. Nms

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

b. power

c. energy

d. work

48. 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

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

a. halved

b. unchanged

c. doubled

d. increased four time

50. 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

51. 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

52. 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

53. Watt day is the unit of

a. power

b. energy

c. force

d. none

54. 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

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

a. moment of inertia

b. angular momentum

c. torque

d. weight

56. Weight
of force is called

a. Torque

b. Weight

c. Moment
of inertia

d. Angular
momentum

57. 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

58. 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

59. 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

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

a. Longitudinal

b. Volumetric

c. Shearing

d. None

61. 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

62 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}
63. If
the temperature of a liquid is raised, then its surface tensionis

a. Decreased

b. Increased

c. Irregular

d. Equal to viscosity

64. 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

65. The CGS unit of coefficient of viscosity is

a. Poise

b. Newton

c. Kg-m

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

a. Their low temperature

b. Their low viscosity

c. Their low density

d. Creation of low pressure

67. The
menisas of mercury in a capillary tube is

a. Convex

b. Concave

c. Plane

d. Uncertain

68. Hooke’s
law essentially defines

a. Stress

b. Strain

c. Field
point

d. Elastic
limit

69. Unit of modulus of elasticity is

a. Dyne/cm

b. Dyne/cm

^{2}
c. Dyne-cm

d. Dynes

70.The menisas of mercury in a capillary tube
is

a. convex

b. concave

c. plane

d. uncertain

71. Hooke’s law essentially defines

a. stress

b. strain

c. field point

d. elastic limit

72. 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

73.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

74. 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

75. 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 increase

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