- AElectromagnetic
- BCurrent electricity
- CElectrochemical
- DElectrostatic
Explanation:
Lightning is a sudden electrostatic discharge during an electrical storm between electrically charged regions of a cloud, between that cloud and another cloud, or between a cloud and the ground.
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The true statement is, on increasing the distance between the plates of a parallel plate condenser
|
(a) The electric intensity between the plates will decrease |
|
(b) The electric intensity between the plates will increase |
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(c) The electric intensity between the plates will remain unchanged |
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(d) The P.D. between the plates will decrease |

A double convex lens of glass of m = 1.5 has radius of curvature of each of its surface is 0.2 m. The power of the lens is
|
(a) + 10 dioptres |
(b) – 10 dioptres |
(c) – 5 dioptres |
(d) +5 dioptres |
Two similar spheres having +q and -q charge are kept at a certain distance. F force acts between the two. If in the middle of two spheres, another similar sphere having +q charge is kept, then it experience a force in magnitude and direction as
|
(a) Zero having no direction |
(b) 8F towards +q charge |
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(c) 8F towards -q charge |
(d) 4F towards +q charge |
In Bohr’s model of hydrogen atom, which of the following pairs of quantities are quantized
| (a) Energy and linear momentum | (b) Linear and angular momentum |
| (c) Energy and angular momentum | (d) None of the above |
A variable condenser is permanently connected to a 100 V battery. If the capacity is changed from 2μF to 10 μF, then change in energy is equal to
|
(a) 2 |
(b) 2.5 |
(c) 3.5 |
(d) 4 |
A potentiometer wire of length 1 m and resistance 10 W is connected in series with a cell of emf 2V with internal resistance 1 W and a resistance box including a resistance R. If potential difference between the ends of the wire is 1 mV, the value of R is
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(a) 20000 W |
(b) 19989 W |
(c) 10000 W |
(d) 9989 W |
An ammeter of 100 W resistance gives full deflection for the current of 10–5 amp. Now the shunt resistance required to convert it into ammeter of 1 amp. range, will be
|
(a) |
(b) |
(c) |
(d) |