Physics
The increase in length of a metal rod depends on:
- the initial length of the rod only
- the rise in temperature only
- the material of the rod only
- all the above three factors
Related Questions
Two rods A and B of the same metal, same length, but one solid and other hollow, are heated to the same rise in temperature. Then:
- the solid rod A expands more than the hollow rod B
- the hollow rod B expands more than the solid rod A
- the hollow rod B contracts, but the solid rod A expands
- both the rods A and B expand the same
A given volume of alcohol and the same volume of water are heated from the room temperature to the same temperature then:
- alcohol contracts, but water expands
- water contracts, but alcohol expands
- water expands more than alcohol
- alcohol expands more than water
The correct statement is:
- Iron rims are cooled before they are placed on the cart wheels.
- A glass stopper gets tightened on warming the neck of the bottle.
- Telephone wires sag in winter, but become tight in summer.
- A little space is left between two rails on a railway track.
Assertion (A) : A humid environment slows the rate of evaporation.
Reason (R) : In humid environment, vapour molecules do not find the space to escape.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- Assertion is true but reason is false
- Assertion is false but reason is true