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