In a Young's double slit experiment, the fringe width will remain same, if (D = distance between screen and plane of slits, d = separation between two slits and λ = wavelength of light used)
|
(a) Both λ and D are doubled |
(b) Both d and D are doubled |
|
(c) D is doubled but d is halved |
(d) λ is doubled but d is halved |
(b) Both d and D are doubled
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At the magnetic north pole of the earth, the value of horizontal component of earth's magnetic field and angle of dip are, respectively
| (a) Zero, maximum | (b) Maximum, minimum |
| (c) Maximum, maximum | (d) Minimum, minimum |
When a plane polarised light is passed through an analyser and analyser is rotated through 90°, the intensity of the emerging light
|
(a) Varies between a maximum and minimum |
|
(b) Becomes zero |
|
(c) Does not vary |
|
(d) Varies between a maximum and zero |
Audio signal cannot be transmitted because
|
(a) The signal has more noise |
|
(b) The signal cannot be amplified for distance communication |
|
(c) The transmitting antenna length is very small to design |
|
(d) The transmitting antenna length is very large and impracticable |
A current I is passed for a time t through a number of voltameters. If m is the mass of a substance deposited on an electrode and z is its electrochemical equivalent, then
|
(a) |
(b) |
|
(c) |
(d) |
