One metallic sphere A is given a positive charge whereas another identical metallic sphere B of the exact same mass as of A is given an equal amount of negative charge. Then:

(1) mass of A and mass of B are the same.

(2) mass of A is more.

(3) mass of B is less.

(4) mass of B is more.

When \(10^{19}\) electrons are removed from a neutral metal plate, the electric charge on it is? 

The charge on 500 cc of water due to protons will be:

1. 6.0 × 10²⁷ C
2. 2.67 × 10⁷ C
3. 6 × 10²³ C
4. 1.67 × 10²³ C

A neutral bubble made of soap solution has radius R. If some negative charge is given which gets distributed uniformly on the surface of the bubble, the radius of the bubble becomes R' then

1.  R' > R

2.  R' = R

3.  R' < R

4.  R' = 0.5 R

A particle of mass m has a charge $q_0$ when it is at rest. When the particle moves with speed v, the charge on the particle will become (c is the velocity of light in vacuum)

1.  $\frac{q_{0}v}{c}$

2.  $\frac{q_{0}c}{v}$

3.  $\frac{q_0}{\sqrt{1-\frac{v^2}{c^2}}}$

4.  $q_0$

Which of the following is not the property of charge?

1.  Like point charges repel each other

2.  For an isolated system, the net charge is conserved

3.  Specific charge is invariant

4.  Charge is quantized

Order of q/m ratio of the proton, $\alpha$-particle and electron is

1.  e > p > $\alpha$

2.  p > $\alpha$ > e

3.  e > $\alpha$ > p

4.  p > e > $\alpha$

A body can be negatively charged by

1.  Giving excess of electrons to it

2.  Removing some electrons from it

3.  Giving some protons to it

4.  Removing some neutrons from it

Given below are two statements: 

A polythene piece rubbed with wool is found to have a negative charge of $3\times {10}^{-7} C$. Transfer of mass from wool to polythene is:
1. 0.7 × 10 ^{- 18}   kg
2. 1.7 × 10 ^{- 17}   kg
3. 0.7 × 10 ^{- 17}   kg
4. 1.7 × 10 ^{- 18}   kg