Welcome to your Work ,Energy and Power
1.
Resistance of a wire becomes four times if…
2.
A block of mass m moves with speed v on a rough surface. Work done by friction is:
3.
Current through a resistor is halved when…
4.
Value of g at depth R/2 is:
6.
Potential energy of mass at height 2h:
7.
A particle moves in a circle at constant speed. Work done by centripetal force is:
8.
Superconductors have resistivity…
9.
A force F produces power P at speed v. F equals:
10.
Two springs k and 2k stretched equally. Ratio of energies:
12.
A spring compressed x does work:
13.
A block slides down a smooth incline of height h. What is its speed at the bottom?
14.
If cross-section area of wire is doubled, drift velocity…
15.
In parallel combination, voltage across each resistor is…
17.
Orbital speed in circular orbit is:
18.
A force does zero work if angle with displacement is:
19.
Work done by gravity on satellite:
20.
Current through a conductor depends on…
21.
A force F acts at angle θ with displacement s. Work done is:
22.
A block is lifted at constant speed. Net work is:
23.
A spring of constant k is compressed by x. Stored energy is:
24.
Electric current is defined as…
25.
Power dissipation is maximum when…
26.
Minimum energy to escape earth:
27.
A man does work W in time t. His power is:
28.
Drift velocity increases when…
29.
Area under F–x graph represents:
30.
Resistivity depends on…
31.
When temperature increases, resistance of metals…
32.
A spring is stretched to 2x. Energy becomes:
33.
Internal resistance of an ideal battery is…
34.
A body of mass m moves with velocity 3v. Its KE becomes:
35.
Power delivered by a force F on velocity v is:
36.
Work done by conservative force around closed loop is:
37.
A body moves under force F = kx. Work done from 0 to x is:
38.
Work done by variable force F = ax²:
39.
A block falls freely from height h. Its speed at half the height is:
40.
A body of mass m is thrown vertically upward with speed v. Maximum height reached is:
41.
Work-energy theorem states:
42.
Heating effect depends on…
43.
If current doubles, drift velocity…
44.
A ball hits wall elastically. Work done by wall is:
45.
A car of mass m is stopped by brakes over distance d. Work done by brakes:
