1. Lenz’s law is conservation of following:
A. Impulse
B. Momentum
C. Mass
D. Energy
[su_spoiler title=”Show Answer” style=”fancy”]Answer: Energy[/su_spoiler]
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
[su_spoiler title=”Show Answer” style=”fancy”]Answer: Brightness of bright fringes reduced[/su_spoiler]
3. The unit of magnetic field is:
A. Newton
B. Newtonmeter
C. Newtonmeter
D. Newton/ampmeter/
[su_spoiler title=”Show Answer” style=”fancy”]Answer: Newton/ampmeter[/su_spoiler]
4. If the current in an bulb drops by 1% the power decreased by:
A. 1%
B. 2%
C. 4%
D. 0.5%
[su_spoiler title=”Show Answer” style=”fancy”]Answer: 2%[/su_spoiler]
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
[su_spoiler title=”Show Answer” style=”fancy”]Answer: Are always closed[/su_spoiler]
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
[su_spoiler title=”Show Answer” style=”fancy”]Answer: Square of amplitudes[/su_spoiler]
7. The image formed by concave mirror may not be find on screen while
object:
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
[su_spoiler title=”Show Answer” style=”fancy”]Answer: Placed between pole and focus[/su_spoiler]
8. The resistances of a material increases with temperature. It is:
A. Metal
B. Insulator
C. Semiconductor
D. Semi metal
[su_spoiler title=”Show Answer” style=”fancy”]Answer: Metal[/su_spoiler]
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
[su_spoiler title=”Show Answer” style=”fancy”]Answer: 15000[/su_spoiler]
10. Powerful permanent magnet will be made by:
A. Cobalt
B. Tin coal
C. Cobalt steel
D. Aluminium
[su_spoiler title=”Show Answer” style=”fancy”]Answer: Tin coal[/su_spoiler
