In order to increase the sensitivity of a moving coil galvanometer, one should decrease
|
(a) The strength of its magnet |
(b) The torsional constant of its suspension |
|
(c) The number of turns in its coil |
(d) The area of its coil |
(b) The torsional constant of its suspension
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Three right angled prisms of refractive indices 
and 
are fixed together using an optical glue as shown in figure. If a ray passes through the prisms without suffering any deviation, then
|
(a) |
(b) |
|
(c) |
(d) 1 + |
For a thermocouple, the neutral temperature is 270℃ and the temperature of its cold junction is 20℃. If there is no deflection in the galvanometer, the temperature of the hot junction should be
|
(a) 210 ℃ |
(b) 540 ℃ |
(c) 520 ℃ |
(d) 209 ℃ |
Orbital acceleration of electron is
|
(a) |
(b) |
(c) |
(d) |
Which of the energy band diagrams shown in the figure corresponds to that of a semiconductor
|
(a)
|
(b)
|
(c)
|
(d)
|
The energy of hydrogen atom in its ground state is – 13.6 eV. The energy of the level corresponding to the quantum number n is equal 5 is
|
(a) – 5.40 eV |
(b) – 2.72 eV |
(c) – 0.85 eV |
(d) – 0.54 eV |
Assertion : Only microwaves are used in radar.
Reason : Because microwaves have very small wavelength.
|
(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 indices of violet and red light are 1.54 and 1.52 respectively. If the angle of prism is 10°, then the angular dispersion is
|
(a) 0.02 |
(b) 0.2 |
(c) 3.06 |
(d) 30.6 |
A moving coil galvanometer has N number of turns in a coil of effective area A, it carries a current I. The magnetic field B is radial. The torque acting on the coil is
|
(a) |
(b) |
(c) |
(d) NABI |
