Surface Tension — JEE physics STD 12 Science — Question

Assertion : A coin is placed on phonogram turn table. The motor is started, coin moves along the moving table.
Reason : The rotating table is providing necessary centripetal force to the coin.

Assertion : A hollow metallic closed container maintained at a uniform temperature can act as a source of black body radiation.
Reason : All metals acts as a black body

Assertion : NAND or NOR gates are called digital building blocks.
Reason : The repeated use of NAND (or NOR) gates can produce all the basic or complicated gates.

Assertion : Temperatures near the sea coast are moderate.
Reason : Water has a high thermal conductivity.

Assertion : If an electric fan be switched on in a closed room, the air of the room will be cooled.
Reason : Fan air decrease the temperature of the room.

Assertion : Owls can move freely during night.
Reason : They have large number of rods on their retina.

Assertion : Friction is a self adjusting force.
Reason : Friction does not depend upon mass of the body.

Assertion : An empty test tube dipped into water in a beaker appears silver, when viewed from a suitable direction.
Reason : Due to refraction of light, the substance in water appears silvery.

Assertion : As the frictional force increases, the safe velocity limit for taking a turn on an unbanked road also increases.
Reason : Banking of roads will increase the value of limiting velocity.