Applied Physics 1, MCQ Question Paper of BE 1 and 2 Semester,Download Previous Years Question Paper 3

S.B. Roll No………..

APPLIED PHYSICS

1^st Exam/Common/5403/0351/Dec’11

Duration: 2^1/2 Hrs.                                                                 Max. Marks: 75

1.       Dimensions of impulse are

(a)[ML^-1T^-2]                                      

(b)[MT^-2]

(c)[MLT^-1]                                        

(d)[ML^-1T^-3]

2.       Which of the following has the smallest value?

(a) Fermi

(b) Millimeter

(c)angstrom

(d)micron

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

a. 523.33 cm³

b. 5.0x10²cm³

c. 5.23 x 10²cm³

d. 5 x 10²cm³

4.       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(0.3)³

5.       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 1%, 2% respectively. The percentage error in x can be

a.

b. 4%

c.7%

d.

6.       If f=x², then the relative error in f is

a.

b.(

c.(

d. 2

7.       The density of the material of a cube is measured by measuring its mass and lengths of its slides, 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%

8.       The significant figures in 0.009 is

a. 1

b.3

c.2

d.4

9.       The velocity ‘v’ of a particle is given in terms of time ‘t’ as

The dimensions of a,b,c are

a.[L²][T][LT^-2]

b.[LT^-2][L][T]

c. [LT^-2][LT][L]

d. [L][LT][T²]

10.     The dimensions of quantities in one of 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

               

11.     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

12.     [M¹L²T^-2] represents

a. force

b. pressure

c. work

d. Planck’s constant

13.     Which of the following quantities is a scalar?

a. mass

b. velocity

c. momentum

d. displacement

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

a.2

b.3

c.4

d. more than 4

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

a.  120^o

b. 90^o

c. B=0

d. A=0

16.     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

17.     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

18.     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

19.     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

20.     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

a.

b.

21.     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

22.     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.

23.     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

24.     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.

25.     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

26.     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

27.     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

28.     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

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

a. 0.1

b.0.8

c.0.98

d. cannot be determined

30.     The energy stored in a watch spring is

a. Kinetic energy

b. potential energy

c. heat energy

d. chemical energy

31.     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

32.     Nms^-8 is the unit of

a. impulse

b. power

c. energy

d. work

33.     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

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

a. halved

b. unchanged

c. doubled

d. increased four time

35.     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 these

36.     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

37.     A force F acting 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.2r

d. 0

38.     Watt day is the unit of

a. power

b. energy

c. force

d. none

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

a. hollow sphere

b. solid sphere

c. both together

d. none of these

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

a. moment of inertia

b. angular momentum

c. torque

d. weight

41.     Weight of force is called

a. torque

b. weight

c. moment of inertia

d. angular momentum

42.     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

43.     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

44.     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

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

a. longitudinal

b. volumetric

c. shearing

d. none

46.     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

47.     In steel the Young’s modulus and strain at the breaking point are 2x10¹¹Nm^-2 and 0.15 respectively. The stress at the breaking point for steels is therefore

a. 1.33x 10¹¹NM^-2

b. 7.5x 10^-3Nm^-2

c. 1.33x 10¹²Nm^-2

d. 3x 10^-4Nm^-2

48.     If the temperature of a liquid is raised, then its surface tension is

a. decreased

b. increased

c. irregular

d. equal to viscosity

49.     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

50.     The CGS unit of coefficient of viscosity is

a. poise

b. newton

c. Kg-m^-1S^-1

d. gs/cm^-1

51.     The clouds float in atmosphere because of

a. their low temperature

b. their low viscosity

c. their low density

d. creation of low pressure

52.     Unit of modulus of elasticity is

a. dyne/cm

b. dyne/cm²

c. dyne-cm

d. dynes

53.     The menisas of mercury in a capillary tube is

a. convex

b. concave

c. plane

d. certain

54.     Hooke’s law essentially defines

a. stress

b. strain

c. field point

d. elastic limit

55.     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

56.     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 ration of velocity of liquid entering and leaving the tube is

a. 8:27

b. 4:9

c. 1:1

d. 9:4

57.     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

58.     The temperature of a gas is a measure of

a. the average potential energy of gaseous modulus

b. the average distance between the molecules of the gas

c. the average Kinetic energy of gaseous molecules

d. the size of the molecules of the gas

59.     The temperature of a patient is 40^OC, his temperature of Fahrenheit scale will be

a. 104^OF

b. 72^OF

c. 96^OF

d. 100^OF

60.     When water is heated from 0^OC to 100^OC its volume

a. increases

b. decreases

c. remains unchanged

d. first decreases and then increases

61.     Mercury thermometers can be used to measure temperature upto

a. 100^OC

b 212^OC

c. 500^OC

d. 360^OC

62.     If a bimetallic strip is heated it will

a. twist itself into a helix

b. bend towards the metal with lover thermal expansion coefficient

c. bend towards the metal with lower thermal expansion coefficient

63.     The process by which sun’s rays read the earth is

a. radiation

b. conduction

c. convection

d. diffusion

64.     The velocity of heat radiation is vaccum 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

65.     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

66.     In Scarle’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

67.     The thermometer suitable to measure 2000^OC is

a. gas thermometer

b. mercury thermometer

c. vapour-pressure thermometer

d. total radiation pyrometer

68.     A piece of ice at 0^OC is put into a vessel containing water at 0^OC. The ice will

a. melt

b. slightly melt

c. not melt

d. vanish in to time

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

a. temperature

b. amounts of heat

c. specific heat

d. thermal capacities

70.     The transmission by conduction is most prominent in

a. liquids

b. solids

c. gases

d. liquids and gases

71.     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

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

a. 3N

b. 13N

c. 8N

d. 5N

73.     A body floats in a liquid contained in a beaker. The whole system is falling under gravity, the upthrust on by 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

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

a. 7N

b. 4N

c. 3N

d. 1N

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

a. 6 units

b. 8 units

c. 32 units

d. 48 units