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PHYSICS MCQs

Total Questions : 3767 | Page 33 of 377 pages
Question 321. The velocity of sound in air
  1.    Decreases with increase of temperature
  2.    Increases with decrease of temperature
  3.    Does not depend on temperature
  4.    Decreases with decrease of temperature
 Discuss Question
Answer: Option D. -> Decreases with decrease of temperature
Question 322. Infrasonic sound has a frequency lower than
  1.    5 Hz
  2.    15 Hz
  3.    20 Hz
  4.    32 Hz
 Discuss Question
Answer: Option C. -> 20 Hz
Question 323. When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to :
  1.    Reflection
  2.    Refraction
  3.    Forced vibrations
  4.    Damped vibrations
 Discuss Question
Answer: Option C. -> Forced vibrations
Question 324. Quality of a musical note depends on
  1.    Fundamental frequency
  2.    Amplitude of the wave
  3.    Harmonics present
  4.    Velocity of sound in the medium
 Discuss Question
Answer: Option C. -> Harmonics present
Question 325. If a band is played on the moon the sound will
  1.    Reverberate
  2.    Be heard by us faintly
  3.    Be heard upto 10km from it
  4.    Not be heard at any distance at all from it
 Discuss Question
Answer: Option D. -> Not be heard at any distance at all from it
Question 326. The shape of our milky way galaxy is
  1.    Circular
  2.    Elliptical
  3.    Spiral
  4.    None of the above
 Discuss Question
Answer: Option C. -> Spiral
Question 327. The colours of stars depend on their
  1.    Temperature
  2.    Distance
  3.    Radius
  4.    Atmospheric pressure
 Discuss Question
Answer: Option A. -> Temperature
Question 328. The substance which conducts current in the solid state is
  1.    Diamond
  2.    Graphite
  3.    Iodine
  4.    Sodium chloride
 Discuss Question
Answer: Option B. -> Graphite
Question 329. Electric current is measured by which instrument?
  1.    Voltmeter
  2.    Ammeter
  3.    Barometer
  4.    Sinometer
 Discuss Question
Answer: Option B. -> Ammeter
Question 330. For which of the following substances, the resistance decreases with increase in temperature?
  1.    Pure silicon
  2.    Copper
  3.    Nichrome
  4.    Platinum
 Discuss Question
Answer: Option C. -> Nichrome

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