Magnetic induction is a
|
(a) Scalar quantity |
(b) Vector quantity |
(c) Both (a) and (b) |
(d) None of the above |
Magnetic induction is a
|
(a) Scalar quantity |
(b) Vector quantity |
(c) Both (a) and (b) |
(d) None of the above |
(b) Vector quantity
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The frequency of the incident light falling on a photosensitive metal plate is doubled, the kinetic energy of the emitted photoelectrons is
|
(a) Double the earlier value |
(b) Unchanged |
|
(c) More than doubled |
(d) Less than doubled |
The number of turns in the coil of an ac generator is 5000 and the area of the coil is
. The coil is rotated at the rate of 100 cycles/sec in a magnetic field of 0.2
. The peak value of the emf generated is nearly
|
(a) 786 kV |
(b) 440 kV |
(c) 220 kV |
(d) 157.1 kV |
When a thin transparent plate of thickness t and refractive index m is placed in the path of one of the two interfering waves of light, then the path difference changes by
|
(a) (m + 1)t |
(b) (m – 1)t |
(c) |
(d) |
When connected across the terminals of a cell, a voltmeter measures 5V and a connected ammeter measures 10 A of current. A resistance of 2 ohms is connected across the terminals of the cell. The current flowing through this resistance will be
|
(a) 2.5 A |
(b) 2.0 A |
(c) 5.0 A |
(d) 7.5 A |
The radius of a soap bubble whose potential is 16V is doubled. The new potential of the bubble will be
|
(a) 2V |
(b) 4V |
(c) 8V |
(d) 16V |
In the Wheatstone's bridge shown, P = 2 Ω, Q = 3Ω, R = 6Ω and S = 8Ω. In order to obtain balance, shunt resistance across 'S' must be
|
(a) 2 Ω |
(b) 3 Ω |
(c) 6 Ω |
(d) 8 Ω |