Explanation:
Electric field due to Q & q, inside the spherical shell is zero.
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The half life of a radioactive element which has only 
of its original mass left after a lapse of 60 days is
|
(a) 12 days |
(b) 32 days |
(c) 60 days |
(d) 64 days |
Thomson coefficient of a conductor is 10μV/K. The two ends of it are kept at 50℃ and 60℃ respectively. Amount of heat absorbed by the conductor when a charge of 10C flows through it is
|
(a) 1000 J |
(b) 100 J |
(c) 100 mJ |
(d) 1 mJ |
Which of the following has a larger chromatic aberration?
On increasing the plate separation of a charged condenser, the energy
|
(a) Increases |
(b) Decreases |
(c) Remains unchanged |
(d) Becomes zero |
Assertion : The air bubble shines in water.
Reason : Air bubble in water shines due to refraction of light
|
(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. |
A person sees his virtual image by holding a mirror very close to the face. When he moves the mirror away from his face, the image becomes inverted. What type of mirror he is using
|
(a) Plane mirror |
(b) Convex mirror |
(c) Concave mirror |
(d) None of these |