- Ais higher at the closer end.
- Bis non-uniform.
- CIs higher at inclined plate.
- DIs uniform.
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X-rays and gamma rays are both electromagnetic waves. Which of the following statements is true
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(a) In general X-rays have larger wavelength than of gamma rays |
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(b) X-rays have smaller wavelength than that of gamma rays |
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(c) Gamma rays have smaller frequency than that of X-rays |
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(d) Wavelength and frequency of X-rays are both larger than that of gamma rays |
Resistance of 100 cm long potentiometer wire is 10 W, it is connected to a battery (2 volt) and a resistance R in series. A source of 10 mV gives null point at 40 cm length, then external resistance R is
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(a) 490 W |
(b) 790 W |
(c) 590 W |
(d) 990 W |
If refractive index of red, violet and yellow lights are 1.42, 1.62 and 1.50 respectively for a medium. Its dispersive power will be
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(a) 0.4 |
(b) 0.3 |
(c) 0.2 |
(d) 0.1 |
Current provided by a battery is maximum when
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(a) Internal resistance equal to external resistance |
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(b) Internal resistance is greater than external resistance |
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(c) Internal resistance is less than external resistance |
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(d) None of these |
A short-circuited coil is placed in a time-varying magnetic field. Electrical power is dissipated due to the current induced in the coil. If the number of turns were to be quadrupled and the wire radius halved, the electrical power dissipated would be
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(a) Halved |
(b) The same |
(c) Doubled |
(d) Quadrupled |
As shown in the figure a metal rod makes contact and complete the circuit. The circuit is perpendicular to the magnetic field with B = 0.15 tesla. If the resistance is 3Ω, force needed to move the rod as indicated with a constant speed of 2m/sec is

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(a) 3.75 |
(b) 3.75 |
(c) 3.75 |
(d) 3.75 |