The current in a triode at anode potential 100 V and grid potential – 1.2 V is 7.5 mA. If grid potential is changed to – 2.2 V, the current becomes 5.5 mA. the value of trans conductance (gm) will be
|
(a) 2 mili mho |
(b) 3 mili mho |
(c) 4 mili mho |
(d) 0.2 mili mho |
(a) 2 mili mho
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The log-log graph between the energy E of an electron and its de-Broglie wavelength λ will be
|
(a)
|
(a)
|
(c)
|
(d)
|
Wave is associated with matter
|
(a) When it is stationary |
|
(b) When it is in motion with the velocity of light only |
|
(c) When it is in motion with any velocity |
|
(d) None of the above |
A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens was 4 D, the power of a cut lens will be
|
(a) 2 D |
(b) 3 D |
(c) 4 D |
(d) 5 D |
In frequency modulation
|
(a) The amplitude of modulated wave varies as frequency of carrier wave |
|
(b) The frequency of modulated wave varies as amplitude of modulating wave |
|
(c) The amplitude of modulated wave varies as amplitude of carrier wave |
|
(d) The frequency of modulated wave varies as frequency of modulating wave |
When light wave suffers reflection at the interface from air to glass, the change in phase of the reflected wave is equal to
| (a) 0 |
(b) 
|
(c) 
|
(d) 2
|
When original mass of star is greater than 5 M (M = mass of the sun). The death of this star will give rise to
|
(a) White dwarf |
(b) Black hole |
(c) Quasars |
(d) Nebula |
