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PHYSICS MCQs

Total Questions : 3767 | Page 3 of 377 pages
Question 21. Sound waves in air are
  1.    transverse
  2.    longitudinal
  3.    electromagnetic
  4.    polarised
 Discuss Question
Answer: Option B. -> longitudinal
Question 22. Magnetism at the centre of a bar magnet is
  1.    minimum
  2.    maximum
  3.    zero
  4.    minimum or maximum
 Discuss Question
Answer: Option C. -> zero
Question 23. It is more difficult to walk on a sandy road than on a concrete road because
  1.    sand is soft and concreter is hard.
  2.    the friction between sand and feet is less than that between concrete and feet.
  3.    the friction between sand and feet is more than that between concrete and feet.
  4.    the sand is grainy but concrete is smooth.
 Discuss Question
Answer: Option B. -> the friction between sand and feet is less than that between concrete and feet.
Question 24. Of the following properties of a wave, the one that is independent of the other is its
  1.    amplitude
  2.    velocity
  3.    wavelength
  4.    frequency
 Discuss Question
Answer: Option A. -> amplitude
Question 25. Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2
  1.    0.14 m/s
  2.    140 m/s
  3.    1.4 km/s
  4.    14 m/s
 Discuss Question
Answer: Option D. -> 14 m/s
Question 26. Lux is the SI unit of
  1.    intensity of illumination
  2.    luminous efficiency
  3.    luminous flux
  4.    luminous intensity
 Discuss Question
Answer: Option A. -> intensity of illumination
Question 27. On a rainy day, small oil films on water show brilliant colours. This is due to
  1.    dispersion
  2.    interference
  3.    diffraction
  4.    polarization
 Discuss Question
Answer: Option B. -> interference
Question 28. Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
  1.    Move towards A
  2.    Move towards B
  3.    Move at right angles to the line joining A and B
  4.    Remain at rest
 Discuss Question
Answer: Option B. -> Move towards B
Question 29. Materials for rain-proof coats and tents owe their water-proof properties to
  1.    surface tension
  2.    viscosity
  3.    specific gravity
  4.    elasticity
 Discuss Question
Answer: Option A. -> surface tension
Question 30. RADAR is used for:
  1.    locating submerged submarines.
  2.    receiving a signals in a radio receiver.
  3.    locating geostationary satellites.
  4.    detecting and locating the position of objects such as Aeroplanes.
 Discuss Question
Answer: Option D. -> detecting and locating the position of objects such as Aeroplanes.

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