Science MCQ Questions with answers

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Here Important Science MCQ questions are added which are frequently asked in almost all the examinations. You can check the correct answer of any question on clicking the show answer button. The Correct answer will be displayed below. You can share any question with your friends on whatsapp by tapping Share button.

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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
📝 Notes
✅ Correct Answer: (B) Zero

Published by Vikash Gupta ⭐ 33.56K Points at 01-Aug-2020 05:49 am in Science

Q. The magnetic moment has dimension of :

  • (A) [L²A]
  • (B) [LA]
  • (C) [L²T-1A]
  • (D) [LT-1A]
📝 Notes
✅ Correct Answer: (A) [L²A]

Published by Vikash Gupta ⭐ 33.56K Points at 01-Aug-2020 05:50 am in Science

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
📝 Notes
✅ Correct Answer: (B) Null points in the magnetic field of a bar magnet

Published by Vikash Gupta ⭐ 33.56K Points at 01-Aug-2020 05:51 am in Science

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
📝 Notes
✅ Correct Answer: (B) Electrons

Published by Vikash Gupta ⭐ 33.56K Points at 01-Aug-2020 05:52 am in Science

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
📝 Notes
✅ Correct Answer: (C) Electric generator – laws of electromagnetic induction

Published by Vikash Gupta ⭐ 33.56K Points at 01-Aug-2020 05:54 am in Science

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
📝 Notes
✅ Correct Answer: (B) 0.77 Am²
Explanation: the right answer is 2.77Am^2 .

Published by Vikash Gupta ⭐ 33.56K Points at 01-Aug-2020 05:55 am in Science

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
📝 Notes
✅ Correct Answer: (C) 0.327 T

Published by Vikash Gupta ⭐ 33.56K Points at 01-Aug-2020 05:56 am in Science

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
📝 Notes
✅ Correct Answer: (A) The total change in magnetic flux

Published by Vikash Gupta ⭐ 33.56K Points at 01-Aug-2020 05:57 am in Science

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
📝 Notes
✅ Correct Answer: (A) Collision of minority charge carrier

Published by Praveen Singh ⭐ 36.81K Points at 01-Aug-2020 05:59 am in Science

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
📝 Notes
✅ Correct Answer: (D) Always bright

Published by Praveen Singh ⭐ 36.81K Points at 01-Aug-2020 06:00 am in Science

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