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- 1. Multiple Choice
1. The handles of our cooking utensils at home are usually made of rubber or hard plastics that do not allow heat to pass through them. These materials
have high resistance
are conductors
both a and b
Neither a or b
- 2. Multiple Choice
Which of the following materials does not belong to the group?
rubber slippers
ceramic plate
aluminum frying pan
electrical tape
- 3. Multiple Choice
Which of the following materials are likely to exhibit more conductive properties than insulating properties?
rubber
aluminum
silver
plastic
wet skin
- 4. Multiple Choice
Electricians usually wear rubber gloves for protection. The purpose of the rubber gloves is to
keep the electrician dry
create an electrical circuit
produce electricity
insulate the electrician
- 5. Multiple Choice
Many electrical wires are wrapped with a plastic coating because plastic is
less expensive than steel
denser than copper
able to keep its shape
a good insulator
- 6. Multiple Choice
The inside of a solar cooker and the pipes of a solar water heater are painted black because black surface is a
Good reflector of heat
Good absorber of heat
Poor absorber of heat
Good radiator of heat
- 7. Multiple Choice
A cement floor would feel cold as compared to a wooden one on a cold morning because the cemented floor
is a better conductor of heat than the wooden floor.
is polished while wooden floor is not polished.
reflects more heat than wooden floor.
is a poor conductor of heat than the wooden floor.
- 8. Multiple Choice
We usually see street dwellers lying on flattened carton boxes and wrapping themselves with a few layers of newspaper on a cold night. This helped them to keep themselves warm because
Friction between the layers of newspaper produces heat.
Air trapped between the layers of newspaper is a bad conductor of heat.
Newspaper is a conductor of heat.
Newspaper is at a higher temperature than the temperature of the surrounding.
- 9. Multiple Choice
Which of these objects is opaque?
a brick wall
eyeglasses lenses
liquid water
stained glass windows
- 10. Multiple Choice
Which part of an automobile is transparent?
door handle
side mirror
hubcap
windshield
- 11. Multiple Choice
When do greenhouse gases cause global warming?
When their concentration is enhanced
When their concentration is decreased
When there are no greenhouse gases
When greenhouse gas released in balance way
- 12. Multiple Choice
Which is the most abundantly found greenhouse gas?
carbon dioxide
water vapor
methane
nitrous oxide
- 13. Multiple Choice
Taking the example of a car parked in the sun for a few hours, which of the following action takes place?
Sunlight once entered the car through windows is partially converted into heat
Sunlight once entered the car through windows is partially converted into electricity
Sunlight once entered the car through windows is completely absorbed by the car
Sunlight once entered the car through windows is partially converted into wind energy
- 14. Multiple Choice
In superconductivity, the electrical resistance of material becomes
zero
infinite
finite
100%
- 15. Multiple Choice
The most commonly used semiconductor material
Silicon.
Germanium.
Mixture of silicon and germanium.
Carbon.
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