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Heat

📆 December 6, 2024

Total Questions: 49

21. Which of the following is used as a substitute of Mercury in thermometers? [S.S.C. Online Graduation Level (T-I) 5.03.2020 (Shift-III)]

Correct Answer: (c) Galinstan
Solution:Galinstan is used as a substitute for mercury in thermometers. Galinstan is a generic name for any member of the liquid metal family. It includes the metals Gallium, Indium, and Tin.

22. Infrared optical_________ can be used to measure and monitor the temperature and hot spots of jet engine rotor blades. [S.S.C. Online CHSL (T-I) 19.04.2021 (Shift-I)]

Correct Answer: (b) Pyrometer
Solution:A pyrometer is a type of remote-sensing thermometer that can take in radiation energy and measure the temperature of distant objects. It can be used to measure and monitor the temperature and hot spots of jet engine rotor blades.

23. Which instrument is used to measure a very high temperature? [S.S.C. Online MTS (T-I) 12.10.2021 (Shift-II)]

Correct Answer: (c) Pyrometer
Solution:A pyrometer is a type of remote-sensing thermometer that can take in radiation energy and measure the temperature of distant objects. It can be used to measure and monitor the temperature and hot spots of jet engine rotor blades.

24. Which instruments are best suited for measuring the temperature inside metal furnaces? [S.S.C. Online Graduation Level (T-I) 8.08.2017 (Shift-I)]

Correct Answer: (a) Pyrometer
Solution:A pyrometer is a type of remote-sensing thermometer that can take in radiation energy and measure the temperature of distant objects. It can be used to measure and monitor the temperature and hot spots of jet engine rotor blades.

25. Which instrument is used for photographing the Sun? [S.S.C. Online Graduation Level (T-I) 4.09.2016 (Shift-III)]

Correct Answer: (d) Spectroheliograph
Solution:A spectroheliograph is an instrument specifically designed to photograph the Sun in a single wavelength of light, usually corresponding to a particular element (like hydrogen or calcium) in the Sun's atmosphere.
It captures monochromatic images of the Sun — meaning images in one specific color/wavelength, revealing fine details.
Used to study solar phenomena like:
  • Sunspots
  • Solar flares
  • Chromosphere structures
  • Prominences

26. The commonly used coolant in refrigerators is- [S.S.C. Online Graduation Level (T-I) 1.09.2016 (Shift-I)]

Correct Answer: (c) Freon
Solution:Freon gas is commonly used as a coolant in refrigerators.

27. The cooling of the Desert Cooler is based on- [C.P.O. S.I. 6.06.2016 (Shift-I)]

Correct Answer: (c) Evaporative cooling
Solution:Evaporative cooling is a device that cools the air by using water evaporation. It is also called 'Desert Cooler'. The mechanism of this coolant differs from that of commonly used air conditioning equipment, which is based on the use of vapor-compression and adsorption refrigeration cycles. Air washers and wet- cooling towers are also based on this principle.

28. Temperature of distant luminous bodies can be determined by- [S.S.C. Online Graduation Level (T-I) 31.08.2016 (Shift-I)]

Correct Answer: (c) Pyrometers
Solution:Extremely high temperatures are measured with the help of a pyrometer or total radiation pyrometer. This thermometer is based on Stephen's law. According to this, the amount of radiation emitted by an object at a high temperature is directly proportional to the fourth power of its absolute temperature. With its help, the temperature of distant objects (such as the Sun) is measured.

29. Heat is transmitted from higher temperature to lower temperature through the actual motion of the molecules in- [S.S.C. Online Graduation Level (T-I) 31.08.2016 (Shift-I)]

Correct Answer: (b) Convection
Solution:Heat is transferred from a higher temperature to a lower temperature by the actual movement of molecules by the process that the higher temperature molecules have higher energy and move about to reach molecules with lower temperature and transfer the energy to them. This process is known as convection. This is only possible when the molecules are free to move about and are not bound by high intermolecular forces of attraction.

30. Which of the following is a mode of heat transfer? [C.P.O. S.I. 6.06.2016 (Shift-I)]

Correct Answer: (a) Convection
Solution:Heat is transferred from a higher temperature to a lower temperature by the actual movement of molecules by the process that the higher temperature molecules have higher energy and move about to reach molecules with lower temperature and transfer the energy to them. This process is known as convection. This is only possible when the molecules are free to move about and are not bound by high intermolecular forces of attraction.
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