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Critical angle of light passing from glass to air is minimum for
|
(a) Red |
(b) Green |
(c) Yellow |
(d) Violet |
Three bulbs of 40W, 60W and 100W are arranged in series with 220V. Which bulb has minimum resistance
|
(a) 40W |
(b) 60W |
(c) 100W |
(d) Equal in all bulbs |
Magnetic dipole moment is a
|
(a) Scalar quantity |
(b) Vector quantity |
(c) Constant quantity |
(d) None of these |
The sodium nucleus 
contains
|
(a) 11 electrons |
(b) 12 protons |
(c) 23 protons |
(d) 12 neutrons |
The observed wavelength of light coming from a distant galaxy is found to be increased by 0.5% as compared with that coming from a terrestrial source. The galaxy is
|
(a) Stationary with respect to the earth |
|
(b) Approaching the earth with velocity of light |
|
(c) Receding from the earth with the velocity of light |
|
(d) Receding from the earth with a velocity equal to 1.5 |
