Red light is generally used to observe diffraction pattern from single slit. If blue light is used instead of red light, then diffraction pattern
|
(a) Will be more clear |
(b) Will contract |
|
(c) Will expanded |
(d) Will not be visualized |
(b) Will contract
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Three light bulbs of 40 W, 60 W and 100 W are connected in series with 220 V source. Which one of the bulbs will glow brightest
|
(a) 40 W |
(b) 60 W |
|
(c) 100 W |
(d) All with the same brightness |
The magnetic susceptibility does not depend upon the temperature in
|
(a) Ferrite substances |
(b) Ferromagnetic substances |
|
(c) Diamagnetic substances |
(d) Paramagnetic substances |
A rectangular loop carrying a current i is situated near a long straight wire such that the wire is parallel to the one of the sides of the loop and is in the plane of the loop. If a steady current I is established in wire as shown in figure, the loop will
| (a) Rotate about an axis parallel to the wire |
| (b) Move away from the wire or towards right |
| (c) Move towards the wire |
| (d) Remain stationary |
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 |