Electron

Q. Electrons were discovered by _______.

1. Albert Einstein

2. Sir Joseph John Thomson

3. Sir Edmund Hillary

4. William Tronisery

Q. An electron has a

1. Relative charge of -1
2. Charge is opposite and equal to a proton
3. All of these
4. Negligible mass

Q.

What are the cathode rays composed of?

1. Only mass
2. Only charge
3. Neither mass nor charge
4. Both mass and charge

Q.

J. J. Thomson performed cathode ray tube experiment in which electricity was passed through a coil in the cathode ray tube and scintillations were observed on the screen. Cathode rays which strike on the screen were nothing but:

1. Electrons

2. Protons

3. Neutrons

4. Can be any of the above

Q.

Energy is ________ when an electron jumps from higher energy level to lower energy level.

1. absorbed

2. released

3. neither absorbed nor released

4. neither absorbed nor released

Q.

A charged entity radiating energy is not considered to be stable.

1. True

2. False

Q.

Who among the following discovered electrons?

1. J.J Thomson

2. Rutherford

3. Charles Darwin

4. Chadwick

Q.

Select the correct statements regarding the electrical charge of electrons and protons.

1. negatively, positively

2. positively, negatively

3. negatively, negatively

4. positively, positively

Q.

The charge on an electron is _______ coulombs.

1. $+1.602\times {10}^{19}$
2. $+1.602\times {10}^{-19}$
3. $-1.602\times {10}^{19}$
4. $-1.602\times {10}^{-19}$

Q.

Mass of the electron is approximately 1837 times that of the proton.

1. True

2. False