1) Diffraction fringes are____________________? a. equally spaced b. distance between them increases c. distance between then decreases d. they are adjacent with no space in between
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2) A thing that emits its own light is___________________? a. luminous b. non-luminous c. incandescent d. bright
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3) Gives the definition of metre in terms of wavelength of red cadmium light ___________________? a. Newton b. Einstein c. Michelson d. Galileo
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4) Which experiment shows that wavelength of light is smaller than that of sound___________________? a. Diffraction b. Polarization c. Interference d. Reflection
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5) When a force is parallel to the direction of motion of the body, then work done on the body is_____________________? a. zero b. minimum c. infinity d. maximum
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6) If a body a mass of 2 kg is raised vertically through 2m, then the work done will be _________________? a. 38.2 J b. 392.1 J c. 39.2 J d. 3.92 J
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7) The average power and instantaneous power become equal if work is done at __________________? a. any rate b. at variable rate c. at uniform rate d. at high rate
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8) Proton electron neutron and a particles have same momentum. Which of them have highest K.E ? a. Proton b. electron c. neutron d. a-particle
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9) Work done by variable force is determine by dividing____________________? a. force into small interval b. displacement into small interval c. both force and displacement into small intervals d. force into small and displacement into large intervals
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10) The escape velocity of a body in gravitational field of earth is independent of__________________? a. its mass b. the angle at which it is thrown c. both its mass and the angle at which it is thrown d. gravitational field of earth
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11) The source of geothermal energy is___________________? a. decay of radioactive element in the earth b. compression of material in the earth c. residual lost of the earth d. all as said in A – B and C
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12) Work done by the force of friction is____________________? a. always positive b. always negative c. positive only for small frictional force d. positive only for large frictional force
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13) If velocity is doubled then__________________? a. momentum increases 4 times and K.E increases 2 times b. momentum and K.E. remain same c. momentum increases 2 times and K.E increases constant d. momentum increases 2 times and K.E increases 4 time
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14) Which of the following is not conservative force_________________? a. friction b. electric c. gravitational d. magnetic
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15) The consumption of energy by a 60 watt bulb in 2 sec is_________________? a. 120 J b. 60 J c. 30 J d. 0.02 J
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16) The escape velocity form the earth surface in km S-1 is____________________? a. 4.2 km S-1 b. 7.5 km S-1 c. 9.5 km S-1 d. 1.1 km S-1
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17) If moon radius is 1600 km and g on its surface is 1.6 ms-2 then the escape velocity on the moon is ___________________? a. 1600 ms-1 b. 50.6 ms-1 c. 71.6 ms-1 d. 2263ms-1
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18) When arrow is released form its bow, its energy is transformed from _____________________? a. heat energy to K.E b. elastic P.E to K.E c. elemical energy to elastic P.E d. K.E to elastic P.E.
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19) The work done by friction is__________________? a. positive b. negative c. zero d. none of these
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20) The dimension of power is_______________? a. [ML2T-3] b. [ML2T-2] c. [ML2T3] d. none of these
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21) The dot product of force and velocity is__________________? a. power b. work c. impulse d. torque
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22) The source of tidal energy is____________________? a. sun b. earth c. both A and B d. moon
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23) On a clear day at noon the solar energy reaching the earth is ____________________? a. 1.44kw/m² b. 1.4kw/m² c. 1 kw/m² d. none
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24) Work done will be maximum if the angle between the force F and displacement d is______________________? a. 45° b. 90° c. 180° d. 0°
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25) A field in which the work done in a moving a body along closed path is zero is called________________? a. electric field b. conservative field c. electromagnetic field d. gravitational field
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26) Which of the following types of force can do no work on the particle on which it acts ? a. frictional force b. gravitational force c. elastic force d. centripetal force
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27) An elevator weighing 3.5 x 10-6 N is raised to a height of 1000 m in the absence of friction, the work done is_________________? a. 3.5 x 103 J b. 3.5 x 104 J c. 3.5 x 106 J d. 3.5 x 109 J
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28) The relation between horse power and watt is_________________? a. 1 hp = 546 watts b. 1 hp = 746 watts c. 1 hp = 1000 watts d. 1 hp = 946 watts
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29) Slope of work time graph is equal to____________________? a. displacement b. acceleration c. power d. energy
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30) Work done on the body equals to the _____________________? a. change in its K.E always b. change in its P.E always c. change in its K.E and change in its P.E d. neither change in K.E and nor change in its P.E
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31) The tides raise the mater in the see roughly in a day___________________? a. once b. twice c. four time d. eight time
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32) The highest value of escape velocity in solar system is planet____________________? a. Earth b. Neptune c. Jupiter d. Moon
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33) Gravitational P.E of a body has____________________? a. no formula b. a formula mgh only c. a formula d. no general formula
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34) When the speed of a moving body is doubled then___________________? a. its K.E is doubled b. its acceleration is doubled c. its P.E is doubled d. its momentum is doubled
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35) One mega watt hour is equal to_________________? a. 36 x 106 J b. 36 x 1012 J c. 36 x 109 J d. 36 x 108 J
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36) Work has the dimension as that of same as that of__________________? a. torque b. angular momentum c. linear momentum d. power
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37) The relation between the escape velocity V esc and orbital speed Vo is given by________________? a. V esc = 1/2Vo b. V esc = -2 Vo c. V esc = Vo d. V esc = 2Vo
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38) When two protons are brought together_____________________? a. Kinetic energy increases b. P.E. between them increases c. P.E. between them decreases d. P.E. between tem does not change
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39) A man lifts vertically a weight of 40kg through 1m in 10s; while a chile lifts vertically a weight of 10kg through a distance of 1m in 1s. What will be correct inference ? a. man does more work than child b. child does more work than man c. both do the same amount of work d. it is a foolish question
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40) The area under the force displacement graph represents__________________? a. area b. work done c. power d. none of these
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