A light ray is incident upon a prism in minimum deviation position and suffers a deviation of 34°. If the shaded half of the prism is knocked off, the ray will
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(a) Suffer a deviation of 34° |
(b) Suffer a deviation of 68° |
|
(c) Suffer a deviation of 17° |
(d) Not come out of the prism |
(c) Suffer a deviation of 17°
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Which of the following phenomena suggests the presence of electron energy levels in atoms
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(a) Radio active decay |
(b) Isotopes |
|
(c) Spectral lines |
(d) a -particles scattering |
A proton, a deutron and an a-particle having the same momentum, enters a region of uniform electric field between the parallel plates of a capacitor. The electric field is perpendicular to the initial path of the particles. Then the ratio of deflections suffered by them is
|
(a) 1 : 2 : 8 |
(b) 1 : 2 : 4 |
(c) 1 : 1 : 2 |
(d) None of these |
Self induction of a solenoid is
|
(a) Directly proportional to current flowing through the coil |
|
(b) Directly proportional to its length |
|
(c) Directly proportional to area of cross-section |
|
(d) Inversely proportional to area of cross-section |
A triangular loop of side l carries a current I. It is placed in a magnetic field B such that the plane of the loop is in the direction of B. The torque on the loop is
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(a) Zero |
(b) IBl |
(c) |
(d) |
Meteors are
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(a) Small stars |
|
(b) Burnt pieces of comets that fall on earth |
|
(c) Comets without tails |
|
(d) None of these |
