A light beam is being reflected by using two mirrors, as in a periscope used in submarines. If one of the mirrors rotates by an angle q, the reflected light will deviate from its original path by the angle
|
(a) 2θ |
(b) 0° |
(c) θ |
(d) 4θ |
(a) 2θ
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A thermo couple develops 200μV between 0℃ and 100℃. If it develops 64μV and 76μV respectively between (0℃ - 32℃) and (32℃ - 70℃) then what will be the thermo emf it develops between 70℃ and 100℃
|
(a) 65 μV |
(b) 60 μV |
(c) 55 μV |
(d) 50 μV |
Angle of dip is 90o at
|
(a) Poles |
(b) Equator |
(c) Both (a) and (b) |
(d) None of these |
When a ray of light passes from a denser to a rarer medium, some part of it gets ....... into the denser medium:
A particle of mass M and charge Q moving with velocity 
describes a circular path of radius R when subjected to a uniform transverse magnetic field of induction B. The work done by the field when the particle completes one full circle is
|
(a) BQv2πR |
(b) |
(c) Zero |
(d) BQ |
In NPN transistor the collector current is 10 mA. If 90% of electrons emitted reach the collector, then
|
(a) Emitter current will be 9 mA |
(b) Emitter current will be 11.1 mA |
|
(c) Base current will be 0.1 mA |
(d) Base current will be 0.01 mA |
Assertion : Isobars are the element having same mass number but different atomic number.
Reason : Neutrons and protons are present inside nucleus.
|
(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. |
In the given figure, when galvanometer shows no deflection, the current (in ampere) flowing through 5Ω resistance will be
|
(a) 0.5 |
(b) 0.6 |
(c) 0.9 |
(d) 1.5 |
