Physics Questions and Answers Section 2

1. Lenz’s law is conservation of following:
A. Impulse
B. Momentum
C. Mass
D. Energy

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Answer: Energy

2. In Young’s experiment if the light is not perfectly monochromatic then:
B. Brightness of bright fringes reduced
C. Dark fringe is not more dark
D. None of these

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Answer: Brightness of bright fringes reduced

3. The unit of magnetic field is:
A. Newton
B. Newton­meter
C. Newton­meter
D. Newton/amp­meter/

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Answer: Newton/amp­meter

4. If the current in an bulb drops by 1% the power decreased by:
A. 1%
B. 2%
C. 4%
D. 0.5%

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Answer: 2%

5. Magnetic lines of force:
A. Always intersect
B. Are always closed
C. Tends to crowd far away from the poles of magnet
D. Do not pass through vacuum

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Answer: Are always closed

6. In simple harmonic motion total energy of a particle is proportional to:
A. Frequency of oscillation
B. Maximum velocity speed
C. Amplitude
D. Square of amplitudes

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Answer: Square of amplitudes

7. The image formed by concave mirror may not be find on screen while
A. Placed between pole and focus
B. Placed between focus and radius of curvature
C. Placed between centre and infinite
D. Placed on radius of curvature

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Answer: Placed between pole and focus

8. The resistances of a material increases with temperature. It is:
A. Metal
B. Insulator
C. Semiconductor
D. Semi metal

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Answer: Metal

9. Approximately how many calories of heat will be genertaed in a 210 W
electric bulb in 5 minutes:
A. 15000
B. 1050
C. 63000
D. 80000

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Answer: 15000

10. Powerful permanent magnet will be made by:
A. Cobalt
B. Tin coal
C. Cobalt steel
D. Aluminium

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Answer: Tin coal
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