In the context of Doppler effect in light, the term ‘red shift’ signifies
|
(a) Decrease in frequency |
(b) Increase in frequency |
|
(c) Decrease in intensity |
(d) Increase in intensity |
(a) Decrease in frequency
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The resistance of a conductor increases with
|
(a) Increase in length |
(b) Increase in temperature |
|
(c) Decrease in cross–sectional area |
(d) All of these |
When 
undergoes fission, 0.1% of its original mass is changed into energy. How much energy is released if 1kg of 
undergoes fission
|
(a) 9 |
(b) 9 |
(c) 9 |
(d) 9 |
A thin lens made of glass of refractive index m = 1.5 has a focal length equal to 12 cm in air. It is now immersed in water 
Its new focal length is
|
(a) 48 cm |
(b) 36 cm |
(c) 24 cm |
(d) 12 cm |
By a monochromatic wave, we mean
|
(a) A single ray |
(b) A single ray of a single colour |
|
(c) Wave having a single wavelength |
(d) Many rays of a single colour |
