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Science MCQ Questions with answers

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 or on option itself. The Correct answer will be displayed below. You can share any question with your friends on whatsapp by tapping whatsapp 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
Correct Answer - Option (B)

No Explanation found. Add Explanation and get +2 points.

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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
Correct Answer - Option (B)

No Explanation found. Add Explanation and get +2 points.

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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
Correct Answer - Option (B)

No Explanation found. Add Explanation and get +2 points.

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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
Correct Answer - Option (C)

No Explanation found. Add Explanation and get +2 points.

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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
Correct Answer - Option (B)

No Explanation found. Add Explanation and get +2 points.

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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
Correct Answer - Option (C)

No Explanation found. Add Explanation and get +2 points.

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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
Correct Answer - Option (A)

No Explanation found. Add Explanation and get +2 points.

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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
Correct Answer - Option (A)

No Explanation found. Add Explanation and get +2 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
Correct Answer - Option (D)

No Explanation found. Add Explanation and get +2 points.

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