Which temperature on the Fahrenheit scale is numerically the same as that on the Celsius scale?
1.
2.
3.
4.
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 . The rise in temperature of the body in the Fahrenheit scale is
1.
2.
3.
4.
The temperature on Celsius scale is , then corresponding temperature on the Fahrenheit scale is
1.
2.
3.
4.
A metal rod is placed freely on a smooth horizontal surface at a temperature of \(25^\circ ~\text{C}.\) The temperature of the surroundings is then increased to \(100^\circ ~\text{C}.\) During the heating of the rod:
| 1. | The rod will remain at the same length |
| 2. | Mechanical stress develops in the rod |
| 3. | Length of the rod increases due to thermal expansion |
| 4. | All of the above |
Given below are two statements:
| Statement I: | On a cold winter day an iron railing feels much colder to the touch than a wooden ceiling, though both are at the same temperature. |
| Statement II: | Wood removes thermal energy from our fingers much slower than iron does. |
| 1. | Statement I is false but Statement II is true. |
| 2. | Both Statement I and Statement II are true. |
| 3. | Both Statement I and Statement II are false. |
| 4. | Statement I is true but Statement II is false. |
Given below are two statements:
| Statement I: |
Heat transfer from the Earth's surface to the atmosphere occurs mainly through convection. |
| Statement II: |
The Sun emits mainly long-wavelength infrared radiation, whereas the Earth emits mainly short-wavelength infrared radiation. |
| 1. | Statement I is false but Statement II is true. |
| 2. | Both Statement I and Statement II are true. |
| 3. | Both Statement I and Statement II are false. |
| 4. | Statement I is true but Statement II is false. |
A faulty thermometer reads freezing point and boiling point of water as respectively, the correct value of temperature as it reads is
(1)
(2)
(3)
(4)
A rod of length 40 cm is stretched between two rigid supports at zero tension. If the temperature is increased by 10°C, the stress produced in it is:
(Young's modulus, Y = 1.2x, coefficient of linear expansion of rod = 2 x /°C)
(1) 2.4 x
(2) 1.2 x
(3) 3.6 ×
(4) 4.8 x
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