Millikan's Oil Drop Experiment

Q.

What is the charge on an electron?

Q. 36.Calculate formal charge on ClO4- and SO42-

Q.

An oil drop has 7.99 $\times$ ${10}^{-19}$ C charge. How many electrons does this oil drop has?

1. 4

2. 3

3. 5

4. 2

Q. 1. Calculate the e/m ratio between electron and proton

Q.

What did Millikans experiment prove?

Q.

What is the importance of Millikans oil drop experiment?

Q. In a Millikan's oil drop experiment, the charge on an oil drop is calculated to be $-6.4\times {10}^{-19}\text{C}$. The number of excess electrons on the drop is:

1. $3.9$
2. $4$
3. $5$
4. $6$

Q. As a result of Millikan's oil drop experiment, value of electronic charge was found to be approximately equal to:

1. $1.6\times {10}^{-19}\text{C}$
2. $-1.6\times {10}^{-19}\text{C}$
3. $3.2\times {10}^{-19}\text{C}$
4. $-3.2\times {10}^{-19}\text{C}$

Q. What is charge? Can single electron loose its charge and gain some charge in nature

Q.

The charge on the electron was found out by

1. R.A Millikan

2. J.J. Thomson

3. Rutherford

4. Chadwik

Q. In Millikan’s oil drop experiment the forces acting on the oil drop when oil drop is moving are gravitaional force, electrostatic force and viscous drag.
Which force will stop acting on the oil drop if it's speed is reduced to zero

1. Gravitational Force
2. Electrostatic Force
3. Viscous Drag
4. All of the above

Q. The nature of anode rays depends upon:

1. Nature of electrode
2. Nature of residual gas
3. Nature of discharge tube
4. All of the above

Q. A certain particle carries $2.5\times {10}^{-16}C$ of static electric charge. Calculate the number of electrons present in it.

Q.

Describe Milikans oil drop experiment in brief.

Q. Millikan’s oil drop experiment was conducted to measure the value of the:

1. e/m ratio
2. Charge ‘e’ on an electron
3. Mass of a proton
4. Mass of an electron

Q. Charge on a proton is $1.6\times {10}^{-19}\text{C}$ and its mass is calculated to be equal to $1.67\times {10}^{-27}\text{kg}$. Then $e/m$ for proton is:
($e:\text{Charge};m:\text{Mass}$)

1. Less than $e/m$ value for electron
2. Equal to $e/m$ value for electron
3. Greater than $e/m$ value for electron
4. Equal to $e/m$ value for neutron

Q. The increasing order of the values of e/m (charge/ mass) is :

1. e, p, n, α
2. n, p, e, α
3. n, p, α, e
4. n, α, p, e

Q.

The charge on the electron is-

1. -9.1 $\times$ ${10}^{-31}$C.

2. -1.6 $\times$ ${10}^{-19}$C.

3. -1.7 $\times$ ${10}^{-19}$C.

4. None of these

Q. In the oil drop experimant, charge on electron came out to be $-1.6\times {10}^{-19}\text{C}$. From Thomson's experiment, $e/m$ value for electron calculated was $1.758820\times {10}^{11}\text{C/kg}$. Find the mass of the electron.
(Given: $e$ is the magnitude of charge on electron)

1. $1.67\times {10}^{-27}\text{kg}$
2. $9.1\times {10}^{-31}\text{kg}$
3. $9.1\times {10}^{-28}\text{kg}$
4. $1.67\times {10}^{-31}\text{kg}$

Q.

The charge on the electron was found out by

1. R.A Millikan

2. J.J. Thomson

3. Rutherford

4. Chadwik

Q. In Milikan's oil drop experiment, which of the following charges can exist on an oil drop?
Charge on electron e = $-1.6\times {10}^{-19}\text{C}$

1. $2.8\times {10}^{-19}\text{C}$
2. $3.2\times {10}^{-19}\text{C}$
3. $8.0\times {10}^{-19}\text{C}$
4. $11.2\times {10}^{-19}\text{C}$

Q. In Milikan's oil drop experiment, which of the following charges can exist on an oil drop?
Charge on electron e = $-1.6\times {10}^{-19}\text{C}$

1. $2.8\times {10}^{-19}\text{C}$
2. $3.2\times {10}^{-19}\text{C}$
3. $8.0\times {10}^{-19}\text{C}$
4. $11.2\times {10}^{-19}\text{C}$

Q. In Millikan’s oil drop experiment, the forces acting on a moving drop of oil are:

1. Gravitational force and viscous drag
2. Gravitational force, electrostatic force and viscous drag
3. Electrostatic force and acceleration force
4. None of the above

Q.

The charge on the electron is-

1. - 1.6 × 10^-19C

2. - 1.7 × 10^-11C

3. None of these

4. - 9.1 × 10^-31C

Q.

Assume that Millikan performed the oil drop experiment. In the oil drop experiment, the following charges(in arbitrary units) were found on a series of oil droplets.

The data obtained is as follows:

2 $\times$ ${10}^{-19}$ C
4 $\times$ ${10}^{-19}$ C
6 $\times$ ${10}^{-19}$ C

Calculate the magnitude of the charge on the electron.

1. 1.6 $\times$ ${10}^{-19}$ C

2. 4 $\times$ ${10}^{-15}$ C

3. 2 $\times$ ${10}^{-19}$ C

4. 2 $\times$ ${10}^{-15}$ C