Welcome to your work , Energy & power - 4
1.
Friction is called a non-conservative force because
2.
The work done by friction on a body moving with constant speed is
3.
When a block slides down a rough incline, which quantity remains conserved?
4.
The principle behind hydrogen bomb is
5.
A block slides on a rough surface and finally stops. The mechanical energy lost is converted mainly into
6.
An electric heater works on conversion of electrical energy mainly into
7.
The calorific value of a fuel represents
8.
A mass of 1 kg corresponds to energy nearly equal to
9.
A 100 W bulb converts electrical energy mainly into
10.
Nuclear reactions release huge energy because
11.
Which reaction absorbs energy from surroundings?
12.
The source of energy in fossil fuels is originally
13.
4200 J of heat raises temperature of 1 kg water by
14.
When palms are rubbed together, the rise in temperature is due to
15.
According to Einstein, mass and energy are related by
16.
In nuclear fusion, energy is released because
17.
Matter can neither be created nor destroyed was modified after
18.
LPG is widely used because it
19.
Increase in temperature due to friction indicates increase in
20.
A body moves in a closed path under a force. Net work done is zero if force is
21.
Most destructive weapons use
22.
200 J of energy consumed per second equals
23.
Which of the following is a conservative force?
24.
Chemical energy arises due to
25.
Sun produces energy by
26.
Energy equivalent of 1 g mass is approximately
27.
The reason electric bulbs glow is
28.
Fusion is difficult on Earth because it requires
29.
Which process involves direct conversion of mechanical energy to heat?
30.
Nuclear fission reaction is best sustained when neutrons used are
31.
Speed of light in vacuum used in E = mc² is approximately
32.
Nuclear energy differs from chemical energy because
33.
The binding energy per nucleon is maximum for nuclei around mass number
34.
If electrical energy is supplied at 500 J/s, the power of the device is
35.
Petrol engine converts chemical energy mainly into
36.
Energy released in nuclear fission comes from
37.
Which law governs attraction and repulsion of charges?
38.
The large energy output of nuclear reactions is due to
39.
Average electrical energy consumption of an urban Indian household per second is about
40.
Chemical energy is ultimately converted into muscular energy during
41.
According to Einstein, mass-energy equivalence implies
42.
The energy obtained from food is stored as
43.
Which of the following is NOT a nuclear fuel?
44.
An exothermic reaction is one in which
45.
Burning 1 kg of coal releases energy mainly because
