1.
A superconductor has a conductivity that is-
2.
A gas-filled balloon bursts more easily with a needle than with a nail because-
3.
Which type of lens is used in movie projectors?
4.
The unidirectional property of a p-n junction is useful for its application as a-
5.
A geostationary satellite should be launched in such a way that it moves from-
6.
Parsec is the unit of-
7.
When a person stands on feet, the pressure on the surface is 'p'. What will be the pressure when the person stands on just one foot?
8.
A stationary wave is formed by-
9.
Ampere is the unit of-
10.
The value of which of the following quantity remains the same in all systems of units?
11.
Clouds float in the atmosphere due to their low-
12.
If the intensity ratio of two waves is 25:9, the ratio of their amplitudes is-
13.
When cathode rays enter an electric field perpendicular to the lines of force, their path becomes-
14.
A real gas can be liquefied by applying pressure when its temperature is-
15.
A transformer operates with-
16.
The cooling system (radiator) in a motor car works on the principle of-
17.
A semiconductor device is connected in series with a battery and a resistor. Current flows through the circuit, but when the battery's polarity is reversed, the current drops to zero. What could the device be?
18.
How many images will a man see if he stands between two plane mirrors inclined at an angle of 60°?
19.
Planet A has double the radius of Planet B, and its mass is four times greater than Planet B. Which of the following statements about the weight of an object on these planets is correct?
20.
Fat can be separated from milk in a cream separator due to-
21.
Why does a person experience a strong shock when accidentally touching a live wire carrying 220V?
22.
A liquid drop tends to assume a spherical shape because of-
23.
Particles that can be added to the nucleus of an atom without altering its chemical properties are-
24.
A lens becomes invisible when immersed in a liquid if-
25.
A girl is swinging on a swing while sitting. How will the time period of the swing change if she stands up?
