- AProduct of the individual capacitors in parallel.
- BSum of all the individual capacitors in parallel.
- CSum of their reciprocals.
- DProduct of their reciprocals.
Explanation:
The equivalent capacitance of the capacitors connected in parallel is given by sum of their individual capacitances, that is if there are n capacitors in parallel the total capacitance is given by, C = C1 + C2 + C3 + C4 + ….. + Cn.
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A plano-convex lens of refractive index 1.5 and radius of curvature 30 cm is silvered at the curved surface. Now this lens has been used to form the image of an object. At what distance from this lens an object be placed in order to have a real image of the size of the object
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(a) 20 cm |
(b) 30 cm |
(c) 60 cm |
(d) 80 cm |
An X-ray tube is operating at 50 kV and 20 mA. The target material of the tube has a mass of 1.0 kg and specific heat 495 J kg-1
. One percent of the supplied electric power is converted into X-rays and the entire remaining energy goes into heating the target. Then
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(a) A suitable target material must have a high melting temperature |
|
(b) The average rate of rise of temperature of target would be 2 °C/s |
|
(c) The minimum wavelength of the X-rays emitted is about 0.25 |
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(d) a, b, c |
Identify the wrong statement in the following. Coulomb's law correctly describes the electric force that
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(a) Binds the electrons of an atom to its nucleus |
|
(b) Binds the protons and neutrons in the nucleus of an atom |
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(c) Binds atoms together to form molecules |
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(d) Binds atoms and molecules together to form solids |
When a certain circuit consisting of a constant e.m.f. E an inductance L and a resistance R is closed, the current in, it increases with time according to curve 1. After one parameter (E, L or R) is changed, the increase in current follows curve 2 when the circuit is closed second time. Which parameter was changed and in what direction

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(a) L is increased |
(b) L is decreased |
(c) R is increased |
(d) R is decreased |