ECAT MCQ Quiz Hub

1. Work done will be maximum if the angle between the force F and displacement d is
45?
90?
180?
0?

2. A field in which the work done in a moving a body along closed path is zero is called
electric field
conservative field
electromagnetic field
gravitational field

3. When a force is parallel to the direction of motion of the body then work done on the body is
zero
minimum
infinity
maximum

4. Which of the following types of force can do no work on the particle on which it acts?
frictional force
gravitational force
elastic force
centripetal force

5. If a body a mass of 2 kg is raised vertically through 2m then the work done will be
38.2 J
392.1 J
39.2 J
3.92 J

6. 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
3.5 x 103 J
3.5 x 104 J
3.5 x 106 J
3.5 x 109 J

7. The average power and instantaneous power become equal if work is done at
any rate
at variable rate
at uniform rate
at high rate

8. The relation between horse power and watt is
1 hp = 546 watts
1 hp = 746 watts
1 hp = 1000 watts
1 hp = 946 watts

9. Proton electron neutron and a particles have same momentum. Which of them have highest K.E?
Proton
electron
neutron
a-particle

10. Slope of work time graph is equal to
displacement
acceleration
power
energy

11. Work done by variable force is determine by dividing
force into small interval
displacement into small interval
both force and displacement into small intervals
force into small and displacement into large intervals

12. Work done on the body equals to the
change in its K.E always
change in its P.E always
change in its K.E and change in its P.E
neither change in K.E and nor change in its P.E

13. The escape velocity of a body in gravitational field of earth is independent of
cits mass
the angle at which it is thrown
both its mass and the angle at which it is thrown
gravitational field of earth

14. The tides raise the mater in the see roughly in a day
once
twice
four time
eight time

15. The source of geothermal energy is
decay of radioactive element in the earth
compression of material in the earth
residual lost of the earth
all as said in a - b and c

16. The highest value of escape velocity in solar system is planet
Earth
Neptune
Jupiter
Moon

17. Work done by the force of friction is
always positive
always negative
positive only for small frictional force
positive only for large frictional force

18. Gravitational P.E of a body has
no formula
a formula mgh only
a formula
no general formula

19. If velocity is doubled then
momentum increases 4 times and K.E increases 2 times
momentum and K.E. remain same
momentum increases 2 times and K.E increases constant
momentum increases 2 times and K.E increases 4 time

20. One mega watt hour is equal to
36 x 106 J
36 x 1012 J
36 x 109 J
36 x 108 J

21. Which of the following is not conservative force
friction
electric
gravitational
magnetic

22. Work has the dimension as that of same as that of
torque
angular momentum
linear momentum
power

23. The consumption of energy by a 60 watt bulb in 2 sec is
120 J
60 J
30 J
0.02 J

24. The relation between the escape velocity V esc and orbital speed Vo is given by
V esc = 1/2Vo
V esc = ?2 Vo
V esc = Vo
V esc = 2Vo

25. The escape velocity form the earth surface in km S-1 is
4.2 km S-1
7.5 km S-1
9.5 km S-1
1.1 km S-1

26. If moon radius is 1600 km and g on its surface is 1.6 ms-2 then the escape velocity on the moon is
1600 ms-1
50.6 ms-1
71.6 ms-1
2263ms-1

27. When two protons are brought together
Kinetic energy increases
P.E. between them increases
P.E. between them decreases
P.E. between tem does not change

28. When arrow is released form its bow its energy is transformed from
heat energy to K.E
elastic P.E to K.E
elemical energy to elastic P.E
K.E to elastic P.E.

29. 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?
man does more work than child
child does more work than man
both do the same amount of work
it is a foolish question

30. The work done by friction is
positive
negative
zero
none of these

31. The area under the force displacement graph represents
area
work done
power
none of these

32. The dimension of power is
[ML2T-3]
[ML2T-2]
[ML2T3]
none of these

33. Propulsion force of a rocket is
non-conservative force
conservative force
both (a) and (b)
none of these

34. The dot product of force and velocity is
power
work
impulse
torque

35. Geothermal energy is a ____________________ source of energy.
non-renewable
stable
renewable
none of the above

36. he source of tidal energy is
sun
earth
both (a) and (b)
moon

37. ________________ cells converts solar energy into electrical energy
rotory
photovoltaic
galvanic
none of these

38. On a clear day at noon the solar energy reaching the earth is
1.44kw/m2
1.4kw/m2
1 kw/m2
none

39. Biomass can be converted into fuels by
direct combustion
fermentation
both (a) and (b)
none of these