Potential difference between the points P and Q in the electric circuit shown is
|
(a) 4.5 V |
(b) 1.2 V |
(c) 2.4 V |
(d) 2.88 V |
Potential difference between the points P and Q in the electric circuit shown is
|
(a) 4.5 V |
(b) 1.2 V |
(c) 2.4 V |
(d) 2.88 V |
(d) 2.88 V
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Coating of strontium oxide on Tungsten cathode in a valve is good for thermionic emission because
|
(a) Work function decreases |
|
(b) Work function increases |
|
(c) Conductivity of cathode increases |
|
(d) Cathode can be heated to high temperature |
The phenomenon of light passing through the object is called:
A ring of radius R, made of an insulating material carries a charge Q uniformly distributed on it. If the ring rotates about the axis passing through its centre and normal to plane of the ring with constant angular speed ω, then the magnitude of the magnetic moment of the ring is
|
(a) Qω |
(b) |
(c) Q |
(d) |
A long magnet is cut in two parts in such a way that the ratio of their lengths is 2 : 1. The ratio of pole strengths of both the section is
|
(a) Equal |
(b) In the ratio of 2 : 1 |
|
(c) In the ratio of 1 : 2 |
(d) In the ratio of 4 : 1 |
The cathode of a photoelectric cell is changed such that the work function changes from W1 to W2 (W2>W1). If the current before and after change are I1 and I2, all other conditions remaining unchanged, then (assuming hn > W2)
|
(a) |
(b) |
(c) |
(d) |
The particles which can be added to the nucleus of an atom without changing its chemical properties are called
|
(a) Electrons |
(b) Protons |
(c) Neutrons |
(d) None of the above |
A group of bright and faint stars is called
|
(a) Galaxy |
(b) Comet |
(c) Black hole |
(d) Constellation |