Two bodies at different temperatures are mixed in a calorimeter. Which of the following quantities remains conserved ?

1.  sum of the temperatures of the two bodies

2.  total heat of the two bodies

3.  total internal energy of the two bodies

4.  internal energy of each body.

The mechanical equivalent of heat

1.  has the same dimension as heat

2.  has the same dimension as work

3.  has the same dimension as energy

4.  is dimensionless.

The heat capacity of a body depends on:

Choose the correct option:

The ratio of specific heat capacity to molar heat capacity of a body

(a) is a universal constant

(b) depends on the mass of the body

(c) depends on the molecular weight of the body

(d) is dimensionless

Choose the correct option 

1.  (a) , (b) 

2. (b) , (c) 

3. (c) only 

4. (a) , (d) 

If heat is supplied to a solid, its temperature

(a) must increase

(b) may increase

(c) may remain constant

(d) may decrease

Choose the correct option 

1.  (a) , (b) 

2. (b) , (c) 

3. (c) , (d) 

4. (a) , (d) 

The temperature of a solid object is observed to be constant during a period. In this period

(a) heat may have been supplied to the body

(b) heat may have been extracted from the body

(c) no heat is supplied to the body

(d) no heat is extracted from the body

Choose the correct option 

1.  (a) , (b) 

2. (b) , (c) 

3. (c) , (d) 

4. (a) , (d) 

The temperature of an object is observed to rise in a period. In this period

(a) heat is certainly supplied to it

(b) heat is certainly not supplied to it

(c) heat may have been supplied to it

(d) work may have been done on it

Choose the correct option 

1.  (a) , (b) 

2. (b) , (c) 

3. (c) , (d) 

4. (a) , (d) 

Heat and work are equivalent. This means,

(a) when we supply heat to a body we do work on it

(b) when we do work on a body we supply heat to it

(c) the temperature of a body can be increased by doing work on it

(d) a body kept at rest may be set into motion along a line by supplying heat to it

Choose the correct option 

1.  (a) , (b) 

2. (b) , (c) 

3. (c) only

4. (a) , (d) 

The thermal conductivity of a rod depends on

1.  length

2.  mass

3.  area of cross section

4.  material of the rod.

In a room containing air, heat can go from one place to another: