The true statement is, on increasing the distance between the plates of a parallel plate condenser
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(a) The electric intensity between the plates will decrease |
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(b) The electric intensity between the plates will increase |
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(c) The electric intensity between the plates will remain unchanged |
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(d) The P.D. between the plates will decrease |
(c) The electric intensity between the plates will remain unchanged
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If the half life of a radioactive sample is 10 hours, its mean life is
|
(a) 14.4 hours |
(b) 7.2 hours |
(c) 20 hours |
(d) 6.93 hours |
Which of the following plots may represent the thermal energy produced in a resistor in a given time as a function of the electric current
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(a) a |
(b) b |
(c) c |
(d) d |
Assertion : If a charged particle is moving on a circular path in a perpendicular magnetic field, the momentum of the particle is not changing,.
Reason : Velocity of the particle in not changing in the magnetic field.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
Moment of inertia of a magnetic needle is 40 gm-cm2 has time period 3 seconds in earth's horizontal field = 3.6 
weber/m2. Its magnetic moment will be
(a) 0.5 
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(b) 5
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(c) 0.250
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(d) 5 
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There is a uniform electric field of strength 
along y-axis. A body of mass 1g and charge 
is projected into the field from origin along the positive x-axis with a velocity 10m/s. Its speed in m/s after 10s is (Neglect gravitation)
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(a) 10 |
(b) 5 |
(c) 10 |
(d) 20 |
The V-i graphs A and B drawn for two voltameters. Identify each graph
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(a) A for water voltameter and B for Cu voltameter |
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(b) A for Cu voltameter and B for water voltameter |
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(c) Both A and B represents Cu voltameter |
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(d) None of these |
The time required to pass the light through a glass slab of 2 mm thick is (
)
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(a) |
(b) |
(c) |
(d) |
