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

2. The term ‘Isoneph' indicates the lines of equal –

(1) cloudiness
(2) salinity
(3) rainfall
(4) pressure

3. Fibre optics work on the principle of –

(1) Scattering of light
(2) Total internal absorption
(3) Total internal reflection
(4) Optical rotation

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

5. The type of mirrors used in the headlamp of cars is –

(1) Parabolic concave
(2) Plane
(3) Spherical convex
(4) Cylindrical concave

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

7. The rate of transfer of charges through a circuit is called?

(1) Potential Difference
(2) Resistance
(3) Current
(4) Energy

8. The filament of electric bulb is made up of :

(1) Copper
(2) Nichrome
(3) Lead
(4) Tungsten

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

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