The amount of heat required to change the state of 1 kg of substance at constant temperatue is called:

1. Kilocal

2. Calorie

3. Specific heat

4. Latent heat

Refer to the plot of temperature versus time showing the changes in the state of ice on heating (not to scale).

Which of the following is correct?

1. The region AB represents water and steam in thermal equilibrium.

2. At B water starts boiling.

3. At C all the water gets converted into steam.

4. C to D represents water and steam in equilibrium at boiling point.

Gas thermometers are more sensitive than liquid thermometers because:

1. gases expand much more than liquids.

2. gases are easily obtained.

3. gases are much lighter.

4. gases do not easily change their states.

While finding specific heat capacity using a calorimeter, error might occur due to:

1. absence of insulating lid

2. absence of water equivalent

3. both 1 and 2

4. neither 1 nor 2

A bimetallic strip is made of aluminium and steel $\left({\mathrm{\alpha }}_{\mathrm{Al}}>{\mathrm{\alpha }}_{\mathrm{steel}}\right)$. On heating, the strip will

1. remain straight

2. get twisted

3. will bend with aluminium on the concave side

4. will bend with steel on the concave side

A uniform metallic rod rotates about its perpendicular bisector with the constant angular speed. If it is heated uniformly to raise its temperature slightly,

1. its speed of rotation increases

2. its speed of rotation decreases

3. its speed of rotation remains the same

4. its speed increases because its moment of inertia increases

The graph between two temperature scales A and B is shown in the figure. Between upper fixed and lower fixed points, there are 150 equal divisions on scale A and 100 on scale B. The relationship for conversion between the two scales is given by 

1. $\frac{t_A-180}{100}=\frac{t_B}{150}$

2. $\frac{t_A-30}{150}=\frac{t_B}{100}$

3. $\frac{t_B-180}{150}=\frac{t_A}{100}$

4. $\frac{t_B-40}{100}=\frac{t_A}{180}$

An aluminium sphere is dipped into the water. Which of the following is true?

1. Buoyancy will be less in water at 0°C than that in water at 4°C

2. Buoyancy will be more in water at 0°C than that in water at 4°C

3. Buoyancy in water at 0°C will be the same as that in water at 4°C

4. Buoyancy may be more or less in water at 4°C depending on the radius of the sphere

Heat is associated with:

1. kinetic energy of random motion of molecules

2. kinetic energy of orderly motion of molecules

3. total kinetic energy of random and orderly motion of molecules

4. kinetic energy of random motion in some cases and kinetic energy of orderly motion in other