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Tuesday, December 1, 2015

S.B. Roll No………..

1st Exam/Common/5403/0351/Dec’11

Duration: 21/2 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
d. 7
6.       A force of 5N acts on a body of weight 9.8N. What is the acceleration produced in M/s2.
     a. 49.0
b. 1.96
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-1is 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 2x1011 Nm-2 and 0.15 respectively. The stress at the breaking point for steels is therefore
a. 1.33x 1011Nm-2
b. 7.5 x 10-3Nm-2
c. 1.33x 1012Nm-2
d. 3x 1010Nm-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. 90O
d. zero
30. The CGS unit of coefficient of viscosity is
a. poise
b. newton
c. Kg-m-1s-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/cm2
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 40OC, his temperature of Fahrenheit scale will be
a. 104OF
b. 72OF
c. 96OF
d. 100OF
40. When water is heated from 0OC to 100OC 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. 100OC
b. 212OC
c. 500OC
d. 360OC
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 2000OC is
a. gas thermometer
b. mercury thermometer
c. vapour-pressure thermometer
d. total radiation pyrometer
48. A piece of ice at 0OC is put into a vessel containing water at 0OC. 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-1T-2]
b. [MT-2]
c. [MLT-1]
d. [ML-1T-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. 523.33cm3
b. 5.0 x102cm3
c. 5.23x102cm3
d. 5x102cm3
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%
60.An experiment measures quantities a,b,c and X is calculated from the formula X=ab2/c3. The percentage errors in a,b,c are respectively. The percentage error in x can be
a. 13%
d. .1%
61. If f=x2, then the relative error in f is
c. .(2
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
63. The significant figures in 0.009 is
a. 1
64. The velocity ‘v’ of a particle is given in terms of time ‘t’ as v=at+
The demsions of a,b,c are
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. [M1L2T-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
d. more than 4
70. Two vectors A and B obey the relation A+B=A-B and  is angle between them, then
b. B=0
c. 90O
d. A=0
71. Two vectors A and B are A=2i^+5k^ and B=3j^+4k^ their scalar product is
a. 20
c. 23
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
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 M1 and M2 are revolving with same speed on circular paths of radii r1 and r2 respectively. The ratio of their centripetal accelerations will be




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