Tangent galvanometer is used to measure
| (a) Steady currents | (b) Current impulses |
| (c) Magnetic moments of bar magnets | (d) Earth's magnetic field |
Tangent galvanometer is used to measure
| (a) Steady currents | (b) Current impulses |
| (c) Magnetic moments of bar magnets | (d) Earth's magnetic field |
(a) Steady currents
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The current in a coil of inductance 5 H decreases at the rate of 2 A/s. The induced e.m.f. is
|
(a) 2 V |
(b) 5 V |
(c) 10 V |
(d) – 10 V |
Assertion : Ultraviolet radiation are of higher frequency waves are dangerous to human being.
Reason : Ultraviolet radiation are absorbed by the atmosphere
|
(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. |
The refractive index of a material of a prism of angles 45°– 45° – 90° is 1.5. The path of the ray of light incident normally on the hypotenuse side is shown in
|
(a) |
(b) |
(b) |
(d) |
An electron beam in an X-ray tube is accelerated through a potential difference of 50000 volts. These are then made to fall on a tungsten target. The shortest wavelength of the X-ray emitted by the tube is
| (a) 2.5 Å | (b) 0.25 nm | (c) 0.25 cm | (d) 0.025 nm |
A hollow sphere of charge does not produce an electric field at any
|
(a) Point beyond 2 metres |
(b) Point beyond 10 metres |
|
(c) Interior point |
(d) Outer point |