Armature current in dc motor will be maximum when
|
(a) Motor has acquired maximum speed |
(b) Motor has acquired intermediate speed |
|
(c) Motor has just started moving |
(d) Motor is switched off |
(c) Motor has just started moving
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In the circuit shown P ≠ R, the reading of the galvanometer is same with switch S open or closed. Then
|
(a) |
(b) |
(c) |
(d) |
In a triode valve
|
(a) If the grid voltage is zero then plate current will be zero |
|
(b) If the temperature of filament is doubled, then the thermionic current will also be doubled |
|
(c) If the temperature of filament is doubled, then the thermionic current will nearly be four times |
|
(d) At a definite grid voltage the plate current varies with plate voltage according to Ohm’s law |
If the length of potentiometer wire is increased, then the length of the previously obtained balance point will
|
(a) Increase |
(b) Decrease |
(c) Remain unchanged |
(d) Become two times |
Assertion : A pulsor is a source of radio waves which change in terms of intensity at regular interval of time
Reason : A pulsor is a rotating neutron star
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Two slits, 4 mm apart, are illuminated by light of wavelength 6000 Å. What will be the fringe width on a screen placed 2m from the slits
|
(a) 0.12 mm |
(b) 0.3 mm |
(c) 3.0 mm |
(d) 4.0 mm |
A negatively charged plate has charge density of 2 
. The initial distance of an electron which is moving toward plate, cannot strike the plate, if it is having energy of 200 eV
|
(a) 1.77 mm |
(b) 3.51 mm |
(c) 1.77 cm |
(d) 3.51 cm |
