X-rays which can penetrate through longer distances in substance are called
|
(a) Soft X-rays |
(b) Continuous X-rays |
(c) Hard X-rays |
(d) None of the above |
(c) Hard X-rays
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The velocity of light emitted by a source S observed by an observer O, who is at rest with respect to S is c. If the observer moves towards S with velocity v, the velocity of light as observed will be
|
(a) c + v |
(b) c - v |
(c) c |
(d) |
The magnetic field at a point x on the axis of a small bar magnet is equal to the field at a point y on the equator of the same magnet. The ratio of the distances of x and y from the centre of the magnet is
|
(a) |
(b) |
(c) |
(d) |
Which rays are not the portion of electromagnetic spectrum
|
(a) X-rays |
(b) Microwaves |
(c) a-rays |
(d) Radio waves |
Cyclotron is used to accelerate
|
(a) Electrons |
(b) Neutrons |
(c) Positive ions |
(d) Negative ions |
Three infinitely long charge sheets are placed as shown in figure. The electric field at point P is
|
(a) |
(b) |
(c) |
(d) |
Three capacitors of capacitance 3 μF , 10 μF and 15 μF are connected in series to a voltage source of 100V. The charge on 15 μF is
|
(a) 50 μC |
(b) 100 μC |
(c) 200 μC |
(d) 280 μC |
Two resistors are connected (a) in series (b) in parallel. The equivalent resistance in the two cases are 9 ohm and 2 ohm respectively. Then the resistances of the component resistors are
|
(a) 2 ohm and 7 ohm |
(b) 3 ohm and 6 ohm |
(c) 3 ohm and 9 ohm |
(d) 5 ohm and 4 ohm |
