1. Which method is used to produce electricity in hydroelectric power plant. ?

By running dynamo by kinetic energy

By ionizing water

By boiling the water to produce steam

Any of the above

Answer: By running dynamo by kinetic energy

Explanation:


2. Radiations which are harmful to the living organisms are ?

ultraviolet radiations

micro waves

Visible radiation.

Infrared radiation.

Answer: ultraviolet radiations

Explanation:


3. A solar water heater cannot be used to get hot water on ?

a windy day

a hot day

a cloudy day

a sunny day

Answer: a cloudy day

Explanation:


4. The major constituent of biogas is methane. ?

A is false but R is true.

A is true but R is false.

Both A and R are true but R is not the correct explanation of (a)

Both A and R are true and R is the correct explanation of (a)

Answer: A is true but R is false.

Explanation:


5. Biogas is formed in the ?

absence of air only

presence of water and absence of air

presence of water only

presence of air only

Answer: presence of water and absence of air

Explanation:


6. U-235 will undergo fission by ?

low energy protons only

medium energy neutrons

high energy neutrons only

low energy neutrons only

Answer: low energy protons only

Explanation:

Heavy nucleus such as uranuim-235, when bombarded with low energy neutrons split into lighter nuclear with the liberation of large amount of energy.


7. Acid rain happens because ?

earth atmosphere contains acids

electrical charges are produced due to friction amongst clouds

burning of fossil fuels releases oxides of carbon, nitrogen and sulphur in the atmosphere

Sun heats up the upper layer of the atmosphere

Answer: burning of fossil fuels releases oxides of carbon, nitrogen and sulphur in the atmosphere

Explanation:


8. The major constituent of biogas is methane. ?

Both A and R are true but R is not the correct explanation of (a)

Both A and R are true and R is the correct explanation of (a)

A is false but R is true.

A is true but R is false.

Answer: A is true but R is false.

Explanation:


9. Which of following is more environment friendly ?

burning of charcoal

Burning of diesel

burning of fire wood

Burning of coal

Answer: burning of charcoal

Explanation:


10. Which energy source is the largest source used in India ?

Bio Gas

Coal

LPG

CNG

Answer: LPG

Explanation: