Light wave enters from medium 1 to medium 2. Its velocity in 2nd medium is double from 1st. For total internal reflection the angle of incidence must be greater than
|
(a) 30o |
(b) 60 o |
(c) 45 o |
(d) 90 o |
(a) 30o
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If cathode rays are projected at right angles to a magnetic field, their trajectory is
|
(a) Ellipse |
(b) Circle |
(c) Parabola |
(d) None of these |
The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the
|
(a) Variation of scattering mechanism with temperature |
|
(b) Crystal structure |
|
(c) Variation of the number of charge carriers with temperature |
|
(d) Type of bon |
A wire of length 5 m and radius 1 mm has a resistance of 1 ohm. What length of the wire of the same material at the same temperature and of radius 2 mm will also have a resistance of 1 ohm
|
(a) 1.25 m |
(b) 2.5 m |
(c) 10 m |
(d) 20 m |
A condenser of 2mF capacitance is charged steadily from 0 to 5 Coulomb. Which of the following graphs correctly represents the variation of potential difference across its plates with respect to the charge on the condenser
|
(a)
|
(a)
|
(c)
|
(d)
|
Heat radiations propagate with the speed of
|
(a) a-rays |
(b) b-rays |
(c) Light waves |
(d) Sound waves |
