Calorie is the unit of

(a)

heat

(b)

work

(c)

temperature

(d)

food

The specific heat capacity of water is

(a)

4200 Jkg^-1K^-1

(b)

420 Jg^-1K^-1

(c)

0.42 Jg^-1K^-1

(d)

4.2 Jkg^-1K^-1

Two cylindrical rods of same length have the area of cross section in the ratio 2:1. If both the rods are made up of same material, which of them conduct heat faster?

(a)

Both rods

(b)

Rod-2

(c)

Rod-1

(d)

None of them

Two cylinders of equal height and radius are made of copper and aluminium. Which of them conducts heat faster?

(a)

Copper rod

(b)

Aluminium rod

(c)

Both of them

(d)

None of them

A device in which the loss of heat due to conduction, convection and radiation is minimized in

(a)

Solar cell

(b)

Solar cooker

(c)

Thermometer

(d)

Thermos flask