- AA tangent galvanometer
- BA moving-coil galvanometer
- CBoth
- DNone of these
Explnation:
In MCG, deflection is proportional to torque on the coil and torque is proportional to current.
Hence, when current is doubled, deflection is doubled.
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The angle of minimum deviation for a prism is 40° and the angle of the prism is 60°. The angle of incidence in this position will be
|
(a) 30° |
(b) 60° |
(c) 50° |
(d) 100° |
The graph which represents the relation between the total resistance R of a multi range moving coil voltmeter and its full scale deflection V is
|
(a) (i) |
(b) (ii) |
(c) (iii) |
(d) (iv) |
Electrons with energy 80 keV are incident on the tungsten target of an X-ray tube. K shell electrons of tungsten have ionization energy 72.5 keV. X-rays emitted by the tube contain only
|
(a) A continuous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of ~ 0.155Å |
|
(b) A continuous X-ray spectrum (Bremsstrahlung] with all wavelengths |
|
(c) The characteristic X-rays spectrum of tungsten |
|
(d) A continuous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of ~ 0.155Å and the characteristic X-ray spectrum of tungsten |
The brightness of a bulb will be reduced, if a resistance is connected in
|
(a) Series with it |
(b) Parallel with it |
|
(c) Series or parallel with it |
(d) Brightness of the bulb cannot be reduced |
Which of the following theories is the most satisfactory about the origin of the universe
|
(a) Big Bang theory |
(b) Pulsating theory |
(c) Steady state theory |
(d) None of these |
Assertion : A spark occur between the poles of a switch when the switch is opened.
Reason : Current flowing in the conductor produces magnetic field.
|
(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. |