1. Which part of the solar cooker is responsible for greenhouse effect ?

Outer cover of the solar cooker

Glass sheet

Mirror

Coating with black colour inside the box

Answer: Glass sheet

Explanation:


2. India exploded her first underground nuclear device at ?

Jaipur

Pokhran

Kota

Ranchi

Answer: Pokhran

Explanation:


3. Fuel used in thermal power plants is ?

fossil fuels

uranium

water

biomass

Answer: fossil fuels

Explanation:


4. In a hydroelectric power plant more electrical power can be generated if water falls from a greater height because ?

more water molecules dissociate into ions

the electricity content of water increases with height

larger amount of potential energy is converted into kinetic energy

its temperature increases

Answer: larger amount of potential energy is converted into kinetic energy

Explanation:


5. The main constituent of CNG is ?

propane

ethane

methane

butane

Answer: methane

Explanation:


6. Spent slurry (Bio-waste after obtaining biogas) is used as ?

used again for generating biogas

food for livestock

manure

fuel

Answer: manure

Explanation:


7. Solar energy can be directly converted to electrical energy by which of the following devices ?

solar heater

solar cell

solar cooker

solar geyser

Answer: solar cell

Explanation:


8. Which one of the following forms of energy leads to least environmental pollution in the process of its harnessing and utilisation ?

Geothermal energy

Solar energy

Nuclear energy

Thermal energy

Answer: Solar energy

Explanation:

Solar energy leads to least environmental pollution in the process of its harnessing and utilisation.


9. The use of reflector in the solar cooker is to ?

increase efficiency

Decrease efficiency

none of these

create green house effect

Answer: increase efficiency

Explanation:

Reflectors (mirror) are used to focus the sun rays along with heat radiation inside the box to achieve high temperature.


10. Biogas is a better fuel than animal dung cake because ?

biogas is used as a fuel for cooking only where as dung cake can be used for cooking, illuminant the lanterns.

biogas bums smoke and leaves no residue

animal dung cake has high calorific value

biogas has lower calorific value.

Answer: biogas bums smoke and leaves no residue

Explanation:

Biogas has high calorific value and leave no residue, no smoke after burning and can be used for domestic purpose, running engines and in gas lanterns for illumination.