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.Management Sciences
Category: Work And Energy
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
The tides raise the mater in the see roughly in a day___________________?
A. once
B. twice
C. four time
D. eight time
The area under the force displacement graph represents__________________?
A. area
B. work done
C. power
D. none of these
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
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
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
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.
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
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
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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