1. Which one of the following is a non-renewable energy source ?

Water energy

Tidal energy

Fossil fuels

Solar energy

Answer: Fossil fuels

Explanation:


2. Hydro power plants generate electricity from ?

by hot liquid

by potential energy of water

a liquid

by steam

Answer: by potential energy of water

Explanation:


3. the major problem in harnessing nuclear energy is how to ?

convert nuclear energy into electrical energy.

sustain the reaction.

split nuclei.

dispose off spent fuel safely.

Answer: dispose off spent fuel safely.

Explanation:


4. Which of the following is the ultimate source of energy ?

Uranium

Fossil fuels

Sun

Water

Answer: Sun

Explanation:


5. Which is the ultimate source of energy ?

Fossil fuels

Uranium

Sun

Water

Answer: Sun

Explanation:


6. Tidal energy is a farm of energy obtained from the ?

motion of the wave in sea

tides occurs in the river water

ocean in the form of tidal waves

motion of surface water in ponds

Answer: ocean in the form of tidal waves

Explanation:

The energy produced by the surge of ocean water during high and low tides due to difference in sea level is called tidal energy.


7. Hydropower plant are located in the ?

plane area

hilly terrains

none of above

desert area

Answer: hilly terrains

Explanation:

Hydroelectric power plant are generally located in high hilly areas where dam can easily be buit and large reservoir for storage of water can be obtained.


8. Solar cells are made of ?

aluminium

silver

silicon

germanium

Answer: silicon

Explanation:

special grade silicon is used for making solar cells.


9. Tidal energy is harnessed by constructing a dam across ?

the river in plane areas

the river in hilly trains

narrow opening to the sea

wide opening to the sea

Answer: narrow opening to the sea

Explanation:

Tidal energy is harnessed by constructing a dam near the shores across narrow opening it.


10. Unit of calorific value of a substance is ?

J kg

J/kg

Joules

Kcal

Answer: J/kg

Explanation: