General Science MCQs with answers Page - 4

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Q. Assuming the earth to be a sphere of uniform mass density, how much would body weight half way down to the centre of earth if it weighed 250 N on the surface ?

  • (A) 175 N
  • (B) 125 N
  • (C) 150 N
  • (D) 200 N

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Q. Electric Potential is :

  • (A) Vector and dimensionless quantity
  • (B) Scalar and dimensional quantity
  • (C) Vector and dimensional quantity
  • (D) Scalar and dimensionless quantity

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Q. Calculate the number of atoms in 39.4 g gold. Molar mass of gold is 197g/mol:

  • (A) 1.20×10²³ atoms
  • (B) 1.5×10²³ atoms
  • (C) 1.25×10²³ atoms
  • (D) None of the above

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Q. Which type of waves used by radar for detecting the presence of aircraft?

  • (A) Radio wave
  • (B) Sound wave
  • (C) Electric wave
  • (D) Ultrasonic wave

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Q. Find the linear momentum of a photon of energy 6 × 10^-20 J.

  • (A) 2.5 × 10^-28 kg ms-1
  • (B) 2 × 10^28 kg ms-1
  • (C) 5 × 10^-28 kg ms-1
  • (D) None of the above

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Q. A gold leaf electroscope is charged and the leaves are observed to diverge by a certain amount. The beam of X-rays is allowed to fall upon the electroscope for a short period. The effect is as follows :

  • (A) The golf leaves will melt
  • (B) The leaves will diverge further
  • (C) There will be no change in the divergence
  • (D) The leaves will collapse

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Q. If the magnetic flux linked with a coil varies at the rate of 1 Wb/min, the induced e.m.f. Is :

  • (A) 1 v
  • (B) 60 v
  • (C) 1/60 v
  • (D) None of the above

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Q. The time period of a satellite revolving in a circular path of radius R is T. the time period of the satellite of radius 9 R will be :

  • (A) T
  • (B) 9T
  • (C) 27T
  • (D) T/9

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Q. Conduction, is the process of heat transfer in which :

  • (A) Heated molecules move from hotter to colder region
  • (B) A heated fluid flows from heated to colder region
  • (C) Wave travels from heated to colder region
  • (D) Heat passes from one particle to other as a result of increased vibration.

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Q. Four beats per second are heard in a gas when two waves of wavelength 1.0 m and 1.01 m are passed in it. The speed of sound in the gas will be :

  • (A) 440 m/s
  • (B) 360 m/s
  • (C) 404 m/s
  • (D) 980 m/s

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