A source emits light of wavelength 4700Å, 5400 Å and 6500 Å. The light passes through red glass before being tested by a spectrometer. Which wavelength is seen in the spectrum
|
(a) 6500 Å |
(b) 5400 Å |
(c) 4700 Å |
(d) All the above |
(a) 6500 Å
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The acceleration of an electron in an electric field of magnitude 50 V/cm, if e/m value of the electron is 1.76 
is
|
(a) 8.8 |
(b) 6.2 |
(c) 5.4 |
(d) Zero |
A certain piece of silver of given mass is to be made like a wire. Which of the following combination of length (L) and the area of cross-sectional (A) will lead to the smallest resistance
|
(a) L and A |
|
(b) 2L and A/2 |
|
(c) L/2 and 2 A |
|
(d) Any of the above, because volume of silver remains same |
The momentum in mechanics is expressed as m × v. The analogous expression in electricity is
|
(a) I × Q |
(b) I × V |
(c) L × I |
(d) L × Q |
Two circular coils can be arranged in any of the three situations shown in the figure. Their mutual inductance will be
|
(a) Maximum in situation (A) |
(b) Maximum in situation (B) |
|
(c) Maximum in situation (C) |
(d) The same in all situations |
