1.
Heavy water is used as a moderator a nuclear reactor. The function of the moderator is-
2.
If the pressure in a closed vessel is reduced by drawing out some gas, the mean free path of the gas molecules will-
3.
Light year is the unit of-
4.
Centigrade and Fahrenheit temperatures are the same at-
5.
Permanent magnet can be made from-
6.
In optical instruments, the lenses are used to form image by the phenomenon of-
7.
When two semiconductors of p- and n-type are brought in contact, they form p-n junction which acts like a/an-
8.
Creation of something from nothing is against the law of-
9.
The photoelectric effect is described as the ejection of electrons from the surface of a metal when-
10.
Water drops do not stick to the oily surface due to-
11.
When water is heated from 0°C to 10°C its volume-
12.
Which one among the following colours has the highest wavelength?
13.
If potential difference and current flowing through a wire is increased twice each then electric power-
14.
Perspiration cools the body because-
15.
Which of the following electromagnetic waves has the longest wavelenght?
16.
The method of communication in which transmission can take place in both directions, but happens only in one direction at a time, is called-
17.
A fuse wire is characterised by-
18.
The phenomenon which cause mirage is-
19.
When the same note is played on a sitar and a flute, the sound produced can be distinguished from each other because of the difference in-
20.
When the milk is churned vigorously the cream from it, is separated out due to-
21.
Decibel is the unit of-
22.
The velocity of sound in moist air is more than in dry air because the moist air has-
23.
A defect of vision in which the point in one plane of an object appear in focus while those in another plane are out of focus is called-
24.
Different objects at different distances are seen by the eye. The parameter that remains constant is-
25.
A passenger in a moving train tosses a coin upward which falls behind him. It implies that the motion of the train is-
