1. In a hydropower plant ?

Water is converted into steam to produce electricity.

Electricity is extracted from water

Potential energy possessed by stored water is converted into electricity

Kinetic energy possessed by stored water is converted into potential energy

Answer: Potential energy possessed by stored water is converted into electricity

Explanation:

The stored water behind the dam has a potential energy which charges into the kinetic energy of falling water. This kinetic energy is utilized to rotate the turbine to produce electricity.


2. The material used for interconnection the solar cells in the solar panel is ?

copper

aluminium

silver

silicon

Answer: silver

Explanation:

Silver is the best conductor of electricity.


3. Select the important factor for the site selection of a thermal power plant. ?

Cost of plant

Availability’ of water

Availability of fuel

Distance from the populated area

Answer: Availability’ of water

Explanation:

Water is required to produce steam. Thermal power plants are setup near the coal field and transmission of electricity is easy than transporting fuel.


4. Dead organisms are transformed into petroleum and natural gas in ?

presence of sunlight

presence of air

absence of air

none of the above

Answer: absence of air

Explanation:


5. Energy can neither be created nor destroyed but still everybody discuss about the energy crisis because ?

Usable form of energy is dissipated to the surroundings in less usable forms.

Energy is consumed and cannot be used again.

Energy transform into different form continuously.

All of these

Answer: All of these

Explanation:

Energy can neither be created nor be destroyed but usable form is dissipated to surrounding in less usable farm which can’t be used again.


6. Wind is caused due to ?

local conditions

rotation of earth

uneven heating of earth’s surface

All of these

Answer: All of these

Explanation:

All are the factors that responsible for the blowing of wind.


7. Wave energy is caused due to ?

kinetic energy possessed by huge waves near the sea shore

strong winds blowing across the sea

both (a) and (b)

potential energy possessed by the stored water

Answer: both (a) and (b)

Explanation:

The waves are generated by a strong wind due to solar energy across the sea.


8. A good fuel should possess ?

high calorific value

moderate ignition temperature

both high calorific value and moderate ignition temperature

high ignition temperature

Answer: both high calorific value and moderate ignition temperature

Explanation:


9. Which element is used in solar cells ?

Sulphur

Phosphorous

Silicon

Carbon

Answer: Silicon

Explanation:


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

a cloudy day

a windy day

a hot day

a sunny day

Answer: a cloudy day

Explanation: