Recently, the phenomenon of super conductivity has been observed at 73 K. This temperature is nearly equal to

1. $-288°\mathrm{F}$

2. $-146°\mathrm{F}$

3. $-328°\mathrm{F}$

4. $+178°\mathrm{F}$

If a graph is plotted between the temperature of a body in degrees Celsius (along the \(\mathrm{y}\)-axis) and Fahrenheit (along the \(\mathrm{x}\)-axis) at different temperatures, then the slope of the graph will be:
1. \(\frac{5}{9}\)

2. \(\frac{9}{5}\)

3. \(\frac{3}{5}\)

4. \(\frac{5}{3}\)

Which of the following is true in modern thermometry?

1. Triple point of water is fixed

2. Boiling point of water is fixed

3. Melting point of ice is fixed

4. Dew point is fixed

A metal wire of length l and area of cross-section A is fixed at its ends by rigid supports at negligible tension. If this wire is cooled, then the tension in it will be

1. Proportional to l

2. Inversely proportional to l

3. Independent of l

4. Independent of A

Which temperature on the Fahrenheit scale is numerically the same as that on the Celsius scale?

1. $-40°\mathrm{F}$

2. $-42°\mathrm{F}$

3. $-70°\mathrm{F}$

4. $-72°\mathrm{F}$

The absolute zero temperature on the Fahrenheit scale is (approximately):
1. \(-273^{\circ}\text{F}\)
2. \(-32^{\circ}\text{F}\)
3. \(-460^{\circ}\text{F}\)
4. \(-132^{\circ}\text{F}\)

Which of the following statements is correct?

1. Natural convection can occur in space having gravity as well as in gravity-free space

2. Forced convection occurs in space having gravity only

3. Forced convection can occur in gravity-free space

4. Natural convection occurs only in gravity-free space

The temperature of a body is raised from $20°\mathrm{C} \mathrm{to} 45°\mathrm{C}$. The rise in temperature of the body in the Fahrenheit scale is

1. $25°\mathrm{F}$

2. $77°\mathrm{F}$

3. $45°\mathrm{F}$

4. $207°\mathrm{F}$

The temperature on Celsius scale is $45°\mathrm{C}$, then corresponding temperature on the Fahrenheit scale is

1. $113°\mathrm{F}$ 

2. $77°\mathrm{F}$

3. $100°\mathrm{F}$

4. $131°\mathrm{F}$

A metal rod is placed on a smooth horizontal surface at temperature \(25^\circ ~\text{C}.\) Now temperature of the surroundings is increased up to \(100^\circ ~\text{C}\)$$, then during heating of the rod,