In diode, when there is saturation current, the plate resistance (
is
|
(a) Zero |
(b) Infinite |
|
(c) Some finite quantity |
(d) Data is insufficient |
(b) Infinite
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$\frac{1}{2}\overrightarrow{\text{a}}$
$\overrightarrow{\text{a}}$
$2\overrightarrow{\text{a}}$
The graph between intensity of light falling on a metallic plate (I) with the current (i) generated is
|
(a)
|
(b)
|
(c)
|
(d)
|
Photoelectric emission is observed from a metallic surface for frequencies 
and 
of the incident light rays (
. If the maximum values of kinetic energy of the photoelectrons emitted in the two cases are in the ratio of 1 : k, then the threshold frequency of the metallic surface is
|
(a) |
(b) |
(c) |
(d) |
The de-Broglie wavelength of a particle moving with a velocity 2.25 × 108 m/s is equal to the wavelength of photon. The ratio of kinetic energy of the particle to the energy of the photon is (velocity of light is 3 × 108 m/s)
|
(a) 1/8 |
(b) 3/8 |
(c) 5/8 |
(d) 7/8 |
A uniform wire of 16 Ω is made into the form of a square. Two opposite corners of the square are connected by a wire of resistance 16 Ω. The effective resistance between the other two opposite corners is
|
(a) 32 Ω |
(b) 20 Ω |
(c) 8 Ω |
(d) 4 Ω |
The amplification factor of a triode is 50. If the grid potential is decreased by 0.20 V, what increase in plate potential will keep the plate current unchanged
|
(a) 5 V |
(b) 10 V |
(c) 0.2 V |
(d) 50 V |
In 
nucleus, there are
|
(a) 138 protons and 88 neutrons |
(b) 138 neutrons and 88 protons |
|
(c) 226 protons and 88 electrons |
(d) 226 neutrons and 138 electrons |
