White light is passed through a prism whose angle is 5°. If the refractive indices for rays of red and blue colour are respectively 1.64 and 1.66, the angle of deviation between the two colours will be
|
(a) 0.1 degree |
(b) 0.2 degree |
(c) 0.3 degree |
(d) 0.4 degree |
(a) 0.1 degree
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The amplification factor of a triode is 20. If the grid potential is reduced by 0.2 volt then to keep the plate current constant its plate voltage is to be increased by
|
(a) 10 volt |
(b) 4 volt |
(c) 40 volt |
(d) 100 volt |
Mutual inductance of two coils can be increased by
|
(a) Decreasing the number of turns in the coils |
|
(b) Increasing the number of turns in the coils |
|
(c) Winding the coils on wooden core |
|
(d) None of the above |
A current of 2.0 ampere passes through a cell of e.m.f. 1.5 volts having internal resistance of 0.15 ohm. The potential difference measured, in volts, across both the ends of the cell will be
|
(a) 1.35 |
(b) 1.50 |
(c) 1.00 |
(d) 1.20 |
A particle of mass m and charge q enters a magnetic field B perpendicularly with a velocity v, The radius of the circular path described by it will be
|
(a) Bq/mv |
(b) mq/Bv |
(c) mB/qv |
(d) mv/Bq |