The maximum intensity in Young's double slit experiment is I0. Distance between the slits is d = 5 l, where l is the wavelength of monochromatic light used in the experiment. What will be the intensity of light in front of one of the slits on a screen at a distance D = 10d
|
(a) |
(b) |
(c) |
(d) |
(a) 
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A current carrying circular loop is freely suspended by a long thread. The plane of the loop will point in the direction
|
(a) Wherever left free |
(b) North-south |
|
(c) East-west |
(d) At 45° with the east-west direction |
The line on the earth's surface joining the points where the field is horizontal is
| (a) Magnetic meridian | (b) Magnetic axis | (c) Magnetic line | (d) Magnetic equator |
If Fresnel’s biprism experiment as held in water inspite of air, then what will be the effect on fringe width
|
(a) Decrease |
(b) Increase |
(c) No effect |
(d) None of these |
In a photoelectric experiment for 4000 Å incident radiation, the potential difference to stop the ejection is 2 V. If the incident light is changed to 3000 Å, then the potential required to stop the ejection of electrons will be
|
(a) 2 V |
(b) Less than 2 V |
(c) Zero |
(d) Greater than 2 V |
The ratio of areas within the electron orbits for the first excited state to the ground state for hydrogen atom is
| (a) 16 : 1 | (b) 18 : 1 | (c) 4 : 1 | (d) 2 : 1 |
A wire in the form of a circular loop of one turn carrying a current produces a magnetic field B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is
|
(a) 5B |
(b) 3B |
(c) 2B |
(d) 4B |
The most commonly used material for making transistor is
|
(a) Copper |
(b) Silicon |
(c) Ebonite |
(d) Silver |
