General Science MCQs with answers Page - 3

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Admin • 802.91K Points
Coach

Q. A convex lens and concave lens each having the same focal length of 25 cm, are put in contact to form a combination of lenses. The power (in dioptres) of the combination is :

  • (A) 25
  • (B) Zero
  • (C) Infinite
  • (D) 50

A

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Coach

Q. The magnetic moment has dimension of :

  • (A) [L²A]
  • (B) [LA]
  • (C) [L²T-1A]
  • (D) [LT-1A]

A

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Q. Which of the following shows that the Earth behaves as a magnet ?

  • (A) Repulsion between like poles
  • (B) Null points in the magnetic field of a bar magnet
  • (C) Attraction between unlike poles
  • (D) No existence of isolated magnetic poles

A

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Q. In the Davisson – Germer experiment if the incident beam consists of electrons, then the diffracted beam consists of :

  • (A) Protons
  • (B) Electrons
  • (C) α -particle
  • (D) Neutrons

A

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Q. Which of the following does not depict the correct link between technology and physics ?

  • (A) Nuclear reactor – nuclear fusion
  • (B) Electron microscope – wave nature of induction
  • (C) Electric generator – laws of electromagnetic induction
  • (D) Optical fibers – total ternal reflection of light

A

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Q. A small magnet of dipole moment M is kept on the arm of a deflection magnetometer sat in tan A position at a distance of 0.2 m. If the deflection is 60°, the value of M is (BH = 0.4 × 10-4 T)

  • (A) Zero
  • (B) 0.77 Am²
  • (C) 10.82 Am²
  • (D) None

A

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Q. A cyclotron is used to obtain a 2 meV beam of protons. The alternating potential difference applied between the dees has a peak value of 20 kV and its frequency is 5 MHz. The intensity of magnetic field to be applied for resonance will be:

  • (A) 0.0327 T
  • (B) 3.27 T
  • (C) 0.327 T
  • (D) None

A

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Q. What determines the charge that flows through a circuit due to the inducted emf?

  • (A) The total change in magnetic flux
  • (B) The final magnetic flux
  • (C) The initial magnetic flux
  • (D) The rate of change of magnetic flux

A

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Q. Avalanche breakdown is due to :

  • (A) Collision of minority charge carrier
  • (B) DL thickness decrease
  • (C) Deflection layer thickness increase
  • (D) None of the above

A

Admin • 802.91K Points
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Q. In Fraunhofer diffraction the centre of diffraction image is :

  • (A) Always dark
  • (B) Bright for large wavelength and dark low for low wavelength
  • (C) Sometime bright and sometime dark
  • (D) Always bright

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