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