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,

Given below are two statements: 
 

Given below are two statements: 
 

A faulty thermometer reads freezing point and boiling point of water as $10°C and 90°C$ respectively, the correct value of temperature as it reads $50°C$ is

(1)  $20°C$

(2) $30°C$

(3) $40°C$

(4) $50°C$