Work And Energy

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Work And Energy



21.  One mega watt hour is equal to
A. 36 x 106 JB. 36 x 1012 J
C. 36 x 109 JD. 36 x 108 J
22.  Which of the following is not conservative force
A. frictionB. electric
C. gravitationalD. magnetic

23.  Work has the dimension as that of same as that of
A. torqueB. angular momentum
C. linear momentumD. power

24.  The consumption of energy by a 60 watt bulb in 2 sec is
A. 120 JB. 60 J
C. 30 JD. 0.02 J

25.  The relation between the escape velocity V esc and orbital speed Vo is given by
A. V esc = 1/2VoB. V esc = ?2 Vo
C. V esc = VoD. V esc = 2Vo
26.  The escape velocity form the earth surface in km S-1 is
A. 4.2 km S-1B. 7.5 km S-1
C. 9.5 km S-1D. 1.1 km S-1

27.  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-1B. 50.6 ms-1
C. 71.6 ms-1D. 2263ms-1
28.  When two protons are brought together
A. Kinetic energy increasesB. P.E. between them increases
C. P.E. between them decreasesD. P.E. between tem does not change
29.  When arrow is released form its bow, its energy is transformed from
A. heat energy to K.EB. elastic P.E to K.E
C. elemical energy to elastic P.ED. K.E to elastic P.E.
30.  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 childB. child does more work than man
C. both do the same amount of workD. it is a foolish question
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