1-Centrifugal force lead to separation of the cream from the churned milk.
2-If the radius of the Earth is made 1/4th, the duration of an year will become 1/8 times.
3-Soft iron form the core of transformer.
4-A geostationary satellite’s height above the earth’s surface is about the six times the radius of the earth.
5-Mari Curie received Nobel prize twice for the same subject.
6-Adhesion enables us to write on the black board with chalk.
7-In general the range of frequency of the “Message Signal is Radio frequency.
8-Nearly 30% of the solar radiations return back to the space without contributing anything to the earth’ s surface temperature. This amount of radiation is known as earth’s albedo.
9-C02 laser is used in cancer treatment.
10- It is easier to swim in sea water as Density of sea water is higher than the ordinary water.
11-The impurity atom with which pure silicon should be doped to make a p-type semiconductor are those of Boron.
12-Infrared rays and X-rays are electromagnetic in nature.
13-Violet wavelengths will suffer maximum deviation while passing through a prism
14-In an satellite a space traveller tries to fill ink in a pen by dipping it in ink. The amount of the ink filled in the pen as compared to the quantity of ink filled on the earth’s surface will be less.
15-Hair of a shaving brush cling together when the brush is removed from water due to Surface tension
16-In the winter, we get warmer by using two blankets instead of one because two blanket enclose air which does not allow the cold to penetrate.
17-When a ball drops onto the floor it bounces. Why does it bounce ?
Ans-The floor exerts a force on the ball during the impact
18-Transformer devices works on the basis of the principle of mutual induction.
19-If the spinning speed of the earth is increased then the weight of body at the equator decreases.
20-Radio-carbon dating is used to determine the age of human fossils.
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