Question Set – 03

21. In work-
    RRB Group -D, 27-11-2018 (Shift-I)
    (a) There is no direction, only have magnitude
    (b) There are no direction & magnitude
    (c) Both magnitude and direction is present
    (d) Only direction, no magnitude
    Ans: a
22. Which of the following work done does not depend on-
    RRB Group -D, 09-10-2018 (Shift-I)
    RRB Group -D, 03-10-2018 (Shift-II)
    RRB Group -D, 09-10-2018 (Shift-II)
    (a) Applied force
    (b) Mass of object
    (c) Displacement
    (d) The angle between force and displacement
    Ans: b

23.lf an object not moving after applying a force, then we can say that
RRR Group-D. 16-11-2018 (Shift-I)
(a) Maximum power has used
(b) Work has done
(c) Minimum power has used
(d) Any work has not done
Ans: d
24. A boy of 50 kg mass climbs 40 stairs in 9 seconds. If the height of each stair is 15cmn, then find his power (g=10ms5)
RRR Group-D 23-10-2018(Shift-II)
(a) 333.33W
(b) 333.34J
(c) 333.34ms
(d) 387.5W
Ans: a

25. The commercial unit of energy is ?
    RRB Group-D 18-09-2018(Shift-ID)
    (a) Kilowatt -hour
    (b) Kilowatt
    (c) Joule
    (d) Watt -hour
    Ans: a
26. Which of the following is not an example of potential energy?
    RRB ALP. & Tec. 30-08-2018(Shift-I)
    (a) A compressed spring
    (b) Flowing water
    (c) A raised hammer
    (d) Water stored in a dam
    Ans: b

27.Calculate the potential energy obtained by a 20kg hammer, when it is raised to a height of 10m?
RRR Groun-D 05-10-2018(Shift-ID
(a) 3000Pa
(b) 2000J
(c) 300OW
(d) 300ON
Ans: b

28.. A compressed spring has compared to a normal spring.
RRB Group-D 12-11-2018(Shift-II)
(a) Less
(b) Zero
(c) Equal
(d) greater
Ans: d

29. When the hammer of 15kg is raised to a height of 10m, find the potential energy obtained by it?
RRB Group-D 05-10-2018(Shift-I)
(a) 1500J
(b) -150J
(C)-1500J
(d) 150J
Ans: a
30.Work present if there is –
RRB Group -D, 26-09-2018 (Shift-)
(a) Force
(b) Energy
(c) Friction
(d) Power
Ans: a