Physics - 02- B- NTPC SSC-NCERT level
1. Decibel is the unit used for –
(1) Speed of light
(2) Intensity of heat
(3) Intensity of sound
(4) Radio wave frequency
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2. The term ‘Isoneph' indicates the lines of equal –
(1) cloudiness
(2) salinity
(3) rainfall
(4) pressure
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3. Fibre optics work on the principle of –
(1) Scattering of light
(2) Total internal absorption
(3) Total internal reflection
(4) Optical rotation
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4. Q.14) A decibel is –
(1) A musical instrument
(2) The wavelength of noise
(3) A musical note
(4) A measure of sound level
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5. The type of mirrors used in the headlamp of cars is –
(1) Parabolic concave
(2) Plane
(3) Spherical convex
(4) Cylindrical concave
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6. If lift is going up with acceleration, the apparent weight of a body is -
(1) may be more or less than true weight
(2) equal to the true weight
(3) less than the true weight
(4) more than the true weight
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7. The rate of transfer of charges through a circuit is called?
(1) Potential Difference
(2) Resistance
(3) Current
(4) Energy
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8. The filament of electric bulb is made up of :
(1) Copper
(2) Nichrome
(3) Lead
(4) Tungsten
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9. When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to –
(1) reflection
(2) refraction
(3) forced vibrations
(4) damped vibrations
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10. Mud houses are cooler in summers and wanner in winters as compared to brick houses because
(1) mud is a good conductor
(2) mud is a bad conductor
(3) mud is a poor insulator
(4) evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
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