On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Physics
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Plastics have a lower density than metals

Metals have higher thermal capacity than plastics

Metals are good conductors of heat

Plastics have a higher thermal conductivity than metals

Plastics have a lower density than metals

Metals have higher thermal capacity than plastics

Metals are good conductors of heat

Plastics have a higher thermal conductivity than metals

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Physics
A transformer

Converts AC voltage to D.C. voltage

Converts DC to AC

Converts electrical energy into mechanical energy

Is used to decrease or increase AC voltage

Converts AC voltage to D.C. voltage

Converts DC to AC

Converts electrical energy into mechanical energy

Is used to decrease or increase AC voltage

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Physics
The bats can fly in the dark because

They can see the objects in darkness

They generate ultrasonic sound waves

They generate flashes of light

They have weak legs and are likely to be attacked by predators

They can see the objects in darkness

They generate ultrasonic sound waves

They generate flashes of light

They have weak legs and are likely to be attacked by predators

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Physics
Which of the following options correctly explains the term heat budget?

It is a mode of transfer of heat through matter by molecular activity.

It is the balance between incoming and outgoing radiation

It is the amount of heat which the surface of earth receives from the sun.

It is the radiation from the earth in the form of long waves.

It is a mode of transfer of heat through matter by molecular activity.

It is the balance between incoming and outgoing radiation

It is the amount of heat which the surface of earth receives from the sun.

It is the radiation from the earth in the form of long waves.

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Physics
Inside an aeroplane, flying at a high altitude,

normal humidity and partial vacuum are maintained.

the pressure is the same as that outside.

the pressure inside is less than the pressure outside.

normal atmospheric pressure is maintained by the use of air pumps.

normal humidity and partial vacuum are maintained.

the pressure is the same as that outside.

the pressure inside is less than the pressure outside.

normal atmospheric pressure is maintained by the use of air pumps.

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Physics
A black body can absorb radiations of :

Higher wavelengths only

Intermediate wavelengths only

All wavelengths

Lower wavelengths only

Higher wavelengths only

Intermediate wavelengths only

All wavelengths

Lower wavelengths only

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Physics

Physics On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Physics A transformer

Physics The bats can fly in the dark because

Physics Which of the following options correctly explains the term heat budget?

Physics Inside an aeroplane, flying at a high altitude,

Physics A black body can absorb radiations of :

Physics
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Physics
A transformer

Physics
The bats can fly in the dark because

Physics
Which of the following options correctly explains the term heat budget?

Physics
Inside an aeroplane, flying at a high altitude,

Physics
A black body can absorb radiations of :