QUESTION ON PHYSICS

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1. Radiocarbon is produced in the atmosphere as a result of -

Collision between fast neutrons and nitrogen nuclei present in the atmosphere

Action of ultraviolet light from the sun on atmospheric oxygen

Action of solar radiations particularly cosmic rays on atmospehric carbon dioxide

Lightning discharge in atmosphere

2. It is easier to roll a stone up a sloping road than to lift it vertical upwards because -

Work done in rolling is more than in lifting

Work done in lifting the stone is equal to rolling it

Work done in both is same but the rate of doing work is less in rolling

Work done in rolling a stone is less than in lifting it

3. The absorption of ink by blotting paper involves -

Viscosity of ink

Capillary action phenomenon

Diffusion of ink through the blotting

Siphon action

4. Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to -

The heating effect of current alone

Hysteresis loss alone

Both the heating effect of current and hysteresis loss

Intense sunlight at noon

5. Mirage is due to -

Unequal heating of different parts of the atmosphere

Magnetic disturbances in the atmosphere

Depletion of ozone layer in the atmosphere

Equal heating of different parts of the atmosphere

6. On a rainy day, small oil films on water show brilliant colors. This is due to -

Dispersion

Interference

Diffraction

Polarization

7. Radar is used for -

Locating submerged submarines

Receiving a signals in a radio receiver

Locating geostationary satellites

Detecting and locating the position of objects such as airplanes

8. Sound of frequency below 20 Hz is called -

Audio sounds

Infrasonic

Ultrasonic

Supersonic s

9. How many meters is one mile ?

1000

100

1609.344

1705.212

10. Which of these is not a metal ?

Gold

Diamond

Silver

Copper

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