In a potentiometer experiment, the galvanometer shows no deflection when a cell is connected across 60 cm of the potentiometer wire. If the cell is shunted by a resistance of 6Ω, the balance is obtained across 50 cm of the wire. The internal resistance of the cell is
|
(a) 0.5 Ω |
(b) 0.6 Ω |
(c) 1.2 Ω |
(d) 1.5 Ω |
(c) 1.2 Ω
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In a potentiometer experiment the balancing with a cell is at length 240 cm. On shunting the cell with a resistance of 2 W, the balancing length becomes 120 cm. The internal resistance of the cell is
|
(a) 4 W |
(b) 2 W |
(c) 1 W |
(d) 0.5 W |
The magnitude and direction of the current in the circuit shown will be
|
(a) |
(b) |
|
(c) 1 A from b to a through e |
(d) 1 A from a to b through e |
While tuning in a certain broadcast station with a receiver, we are actually
|
(a) Varying the local oscillator frequency |
|
(b) Varying the frequency of the radio signal to be picked up |
|
(c) Tuning the antenna |
|
(d) None of these |
Comparing real and virtual images, we may say that:
If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material denoted by 
respectively then
|
(a) |
(b) |
|
(c) |
(d) |
The inductance of a coil is 60μH. A current in this coil increases from 1.0 A to 1.5 A in 0.1 second. The magnitude of the induced e.m.f. is
|
(a) 60 |
(b) 300 |
(c) 30 |
(d) 3 |
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 |
