679 questions across 1 question group — pick any mix to generate a Physics paper with step-by-step answer keys.
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
N identical spherical drops charged to the same potential V are combined to form a big drop. The potential of the new drop will be
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(a) V |
(b) V/N |
(c) V × N |
(d) V × |
The electric field due to an electric dipole at a distance r from its centre in axial position is E. If the dipole is rotated through an angle of 90° about its perpendicular axis, the electric field at the same point will be
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(a) E |
(b) E/4 |
(c) E/2 |
(d) 2E |
Two capacitors 
and 
in series, are connected in parallel to a third capacitor
. This arrangement is then connected to a battery of e.m.f. = 2V, as shown in the figure. How much energy is lost by the battery in charging the capacitors
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(a) 22 |
(b) 11 |
(c) |
(d) |
Assertion : Mass of ion is slightly differed from its element.
Reason : Ion is formed, when some electrons are removed or added so mass changes.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A 10 micro-farad capacitor is charged to 500 V and then its plates are joined together through a resistance of 10 ohm. The heat produced in the resistance is
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(a) 500 J |
(b) 250 J |
(c) 125 J |
(d) 1.25 J |
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