If a body is positively charged, then it has
A)
Excess of electrons
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B)
Excess of protons
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C)
Deficiency of electrons
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D)
Deficiency of neutrons
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Among identical spheres A and B having charges as \[-\,5C\] and \[-\,16C\]
A)
\[-\,5C\] is at higher potential
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B)
\[-\,16C\] is at higher potential
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C)
Both are at equal potential
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D)
It cannot be said
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Which of the following is best insulator?
A)
Carbon
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B)
Paper
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C)
Graphite
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D)
Ebonite
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If body is charged by rubbing it, its weight
A)
remains precisely constant
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B)
Increases slightly
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C)
Decreases slightly
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D)
May increase slightly or may decrease slightly
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A comb run through one's dry hair attracts small bits of paper. This is due to
A)
Comb is a good conductor
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B)
Paper is a good conductor
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C)
The atoms in the paper get polarised by the charged comb
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D)
The comb possesses magnetic properties
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The charge given to any conductor resides on its outer surface, because
A)
The free charge tends to be in its minimum potential energy state
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B)
The free charge tends to be in its minimum kinetic energy state
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C)
The free charge tends to be in its maximum potential energy state
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D)
The free charge tends to be in its maximum kinetic energy state
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Capacitors are used in electrical circuits where appliances need more
A)
Current
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B)
Voltage
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C)
Watt
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D)
Resistance
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When a lamp is connected in series with capacitor, then
A)
Lamp will not glow
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B)
Lamp will burst out
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C)
Lamp will glow normally
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D)
None of these
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The net charge on capacitor is
A)
2q
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B)
q/2
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C)
0
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D)
\[\infty \]
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Two identical conductors of copper and aluminium are placed in an identical electric fields. The magnitude of induced charge in the aluminium will be
A)
Zero
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B)
Greater than in copper
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C)
Equal to that in copper
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D)
Less than in copper
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One metallic sphere A is given positive charge whereas another identical metallic sphere B of exactly same mass as of A is given equal amount of negative charge. Then
A)
Mass of A and mass of B still remain equal
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B)
Mass of A increases
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C)
Mass of B decreases
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D)
Mass of B increases
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There are two metallic spheres of same radii but one is solid and the other is hollow, then
A)
Solid sphere can be given more charge
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B)
Hollow sphere can be given more charge
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C)
They can be charged equally (Maximum)
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D)
None of the above
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A soap bubble is given a negative charges then its radius
A)
Decreases
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B)
Increases
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C)
Remains unchanged
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D)
Nothing can be predicted as information is insufficient
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Four metal conductors having difference shapes 1. A sphere 2. Cylindrical 3. Pear 4. Lighting conductor are mounted on insulating sands and charged. The one which is best suited to retain the charges for a longer time is
A)
1
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B)
2
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C)
3
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D)
4
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When a body is earth connected, electrons from the earth flow into the body. This means the body is
A)
Unchanged
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B)
Charged positively
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C)
Charged negatively
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D)
an insulator
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Electric potential of earth is taken to be zero because earth is a good
A)
Insulator
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B)
conductor
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C)
Semiconductor
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D)
Dielectric
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An uncharged capacitor is connected to a battery. On charging the capacitor
A)
All the energy supplied is stored in the capacitor
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B)
Half the energy supplied is stored in the capacitor
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C)
The energy stored depends upon the capacity of the capacitor only
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D)
The energy stroed depends upon the time for which the capacitor is charged.
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When we touch the terminals of a high voltage capacitor, even after a high voltage has been cut off, then the capacitor has a tendency to
A)
Restore energy
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B)
Discharge energy
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C)
Affect dangerously
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D)
both [b] and [c]
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In nature, the electric charge of any system is always equal to
A)
Half integral multiple of the least amount of charge
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B)
Zero
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C)
Square of the least amount of charge
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D)
Integral multiple of the least amount of charge
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Consider two point charges of equal magnitude and opposite sign separated by a certain distance. The neutral point between them
A)
Does not exist
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B)
Will be in midway between them
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C)
Lies on the perpendicular bisector of the line joining the two
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D)
Will be closer to the negative charge.
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