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PHYSICS MCQs

Total Questions : 3767 | Page 13 of 377 pages
Question 121. The wavelength at which the peak of intensity of blackbody radiation occurs
  1.    Increases with increase in temperature
  2.    Decreases with increase in temperature
  3.    Is the same at all temperatures
  4.    Does not follow any pattern as temperature changes
 Discuss Question
Answer: Option B. -> Decreases with increase in temperature
Question 122. Which of the following principle is used to produce ''low-temperatures' ?
  1.    Super conductivity
  2.    Joule-Kelvin effect
  3.    Thermo-electric effect
  4.    Adiabatic demagnetisation
 Discuss Question
Answer: Option D. -> Adiabatic demagnetisation
Question 123. The first law of thermodynamics is simply the case of
  1.    Charle's law
  2.    Newton's law of cooling
  3.    The law of heat exchange
  4.    The law of conservation of energy
 Discuss Question
Answer: Option D. -> The law of conservation of energy
Question 124. The commonly used coolant in refrigerators is
  1.    Ammonia
  2.    Nitrogen
  3.    Freon
  4.    Oxygen
 Discuss Question
Answer: Option C. -> Freon
Question 125. Energy in reflected light :
  1.    Does not depends on the angle of incidence
  2.    Increases with the increase in angle
  3.    Decreases with the increase in angle of incidence
  4.    Becomes maximum for angle of incidence equal to 45°
 Discuss Question
Answer: Option B. -> Increases with the increase in angle
Question 126. Conservation of energy refers to the fact that
  1.    If you conserve energy you will not be as tired
  2.    Energy cannot be created or destroyed but can be converted from one form to another
  3.    No chemical reaction is 100 percent efficient
  4.    The entropy of the universe is always increasing
 Discuss Question
Answer: Option B. -> Energy cannot be created or destroyed but can be converted from one form to another
Question 127. Which of the following causes adiabatic temperature changes in atmosphere?
  1.    Deflection and advection
  2.    Latent heat of condensation
  3.    Expansion and compression of the air
  4.    Partial absorption of solar radiation by the atmosphere
 Discuss Question
Answer: Option C. -> Expansion and compression of the air
Question 128. Which of the following options correctly explains the term heat budget?
  1.    It is a mode of transfer of heat through matter by molecular activity.
  2.    It is the balance between incoming and outgoing radiation
  3.    It is the radiation from the earth in the form of long waves.
  4.    It is the amount of heat which the surface of earth receives from the sun.
 Discuss Question
Answer: Option B. -> It is the balance between incoming and outgoing radiation
Question 129. Which one of the following is not a feature of Indifference Curve?
  1.    They do not intersect each other
  2.    They slope downwards to the right
  3.    They are parallel to each other
  4.    They are concave to each other
 Discuss Question
Answer: Option D. -> They are concave to each other
Question 130. Instruments for measuring Solar Radiation?
  1.    Ammeter
  2.    Pyranometer
  3.    Dynamometer
  4.    Anemometer
 Discuss Question
Answer: Option B. -> Pyranometer

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