If in the winter season, the surface temperature of the lake is $1°\mathrm{C}$, the temperature at the bottom of the lake will be:

The readings of a bath on Celsius and Fahrenheit thermometers are in the ratio of 2: 5. The temperature of the bath is:

A hole is drilled in a copper sheet. The diameter of the hole is 4.24 cm at $27.0°\mathrm{C}$. The diameter of the hole, when it is heated to 35.0 °C, is:

On heating, a uniform metallic cylinder length increases by 3%. The area of cross-section of its base will increase by:

A uniform copper rod of length 50 cm and diameter 3.0 mm is kept on a frictionless horizontal surface at 20 °C. The coefficient of linear expansion of copper is $2.0\times {10}^{-5} {\mathrm{K}}^{-1}$ and Young's modulus is $1.2\times {10}^{11} \mathrm{N}/{\mathrm{m}}^2$. The copper is heated to 100°C, then the tension developed in the copper rod is:

The coefficient of volume expansion of glycerin is $49\times {10}^{-5} {\mathrm{K}}^{-1}$. The fractional change in the density on a 30 °C rise in temperature is:

A steel tape is calibrated at 20°C. On a cold day when the temperature is -15°C, the percentage error in the tape will be: $\left[{\mathrm{\alpha }}_{\mathrm{steel}}=1.2\times {10}^{-5}°{\mathrm{C}}^{-1}\right]$

The water equivalent of 20 g of aluminium (specific heat 0.2 cal g^-1°C^-1) is:

100 g of ice (latent heat 80 cal g^-1) at 0 °C is mixed with 100 g of water (specific heat 1 cal g^-1 °C^-1) at 80 °C. The final temperature of the mixture will be:

200 g of ice at -20°C is mixed with 500 g of water at 20°C in an insulating vessel. Final mass of water in vessel is: (Specific heat of ice$=0.5 \mathrm{cal} {\mathrm{g}}^{-1}°{\mathrm{C}}^{-1}$)

Which of the following material is most suitable for cooking utensils?

Which of the following material is used to make a calorimeter?

The thermal capacity of 100 g of aluminium: (specific heat$=0.2 \mathrm{cal}/\mathrm{g}°\mathrm{C}$)

The density of water is maximum at:

A block of ice at -12 °C is slowly heated and converted into steam at 100 °C. Which of the following curves best represents the event?

1.

2.

3.

4.

In engines, water is used as a coolant, because:

Select correct statement related to heat.

Which of the following factors affect the thermal conductivity of a rod?

What is the dimensional formula for thermal resistance?

Four rods of the same material with different radii r and length l are used to connect two reservoirs of heat at different temperatures. Which one will conduct maximum heat?

Why it is hotter for the same distance over the top of a candle than it is inside of its flame?

In gravity-free space, heat transfer is not possible by:

Which factor does not affect convection?

A polished plate with a rough black spot is heated to a high temperature and then taken to a dark room, then,

"A good absorber is a good emitter" is explained by:

The rate of radiation of energy from a hot object is maximum if its surface is:

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?

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

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

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