Define impulse. Write down its S.I. unit.

What is electric charge? Write down its S.I. unit.

Define unit of force. Write down its units in CGS system and SI and find the relationship between them.

Define intensity of a gravitational field. Write down its CGS and SI units.

What is heat? Write down its units.

Define the Activity of a radioactive sample. Write its S.I. unit. A radioactive sample has activity of 10000 disintegrations per second (dps) after 20 hours. After next 10 hours its Activity reduces to 5000 dps. Find out its half-life and initial activity.

What is temperature? Write down its units.

Define gravitational potential .Write down its CGS and SI units.

Define the activity of a given radioactive substance. Write its SI unit.

Define heat resitance. Write the SI.. unit of heat resistance.

Define cofficient of surface expansion. Write its SI unit.