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A 500 Hz modulating voltage fed into an FM generator produces a frequency deviation of 2.25 kHz. If amplitude of the voltage is kept constant but frequency is raised to 6 kHz then the new deviation will be
|
(a) 4.5 kHz |
(b) 54 kHz |
(c) 27 kHz |
(d) 15 kHz |
In determining the temperature of a distant star, one makes use of
|
(a) Kirchhoff's law |
(b) Stefan's law |
|
(c) Wien's displacement law |
(d) None of these |
In the circuit shown below, The reading of the voltmeter V is
|
(a) 12 V |
(b) 8 V |
(c) 20 V |
(d) 16 V |
The figure below shows the north and south poles of a permanent magnet in which n turn coil of area of cross-section A is resting, such that for a current i passed through the coil, the plane of the coil makes an angle θ with respect to the direction of magnetic field B. If the plane of the magnetic field and the coil are horizontal and vertical respectively, the torque on the coil will be
|
(a) τ = niAB cosθ |
|
(b) τ = niAB sinθ |
|
(c) τ = niAB |
|
(d) None of the above, since the magnetic field is radial |
In electrolysis, if the duration of the passage of current is doubled, the mass liberated i
|
(a) Doubled |
(b) Halved |
(c) Increased four times |
(d) Remains the same |
An electron (charge = 1.6 
coulomb) is accelerated through a potential of 1,00,000 volts. The energy required by the electron is
|
(a) 1.6 |
(b) 1.6 |
(c) 0.53 |
(d) 1.6 |
