Electric Charge

Q. The factor(s) affecting the resistance of a conductor is/are:

1. Length of the conductor
2. Area of cross-section of the conductor
3. Material of the conductor
4. Color of the conductor

Q. Resistivity of a material depends upon ________ of the conductor.

1. density
2. temperature
3. length
4. cross-sectional area

Q. Two identical metal sphers having equal and similar charges repel each other with a force of 1800N when they are placed 10cms apart in a medium of dielectric constants. Determine the charge on each sphere.

Q. In a circular circuit, the current flows in the clockwise direction. What is the direction of the flow of positive charges?

1. Clockwise
2. Anticlockwise
3. Depends on the radius of circular circuit
4. Depends on the potential difference applied

Q.

A body is having a charge of 10 C. When it comes in contact with an uncharged body then it looses 1.6 C of charge. Find the number of electrons lost.

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

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

3. ${10}^{19}$

4. -${10}^{-19}$

Q.

Electric circuit is a closed path in which the current flows

1. True
2. False

Q.

The condition for an electric charge to flow from one point to other is that the two points must have electric:

1. Circuit

2. Charge

3. Potential difference

4. Cell

Q.

As a cat rubs its back along a carpet, it acquires a charge of $+8.2\times {10}^{-7}C$. How many electrons did it lose to the carpet?

1. $5.12\times {10}^{19}$

2. $5.12\times {10}^{12}$

3. $51.2\times {10}^{12}$

4. cannot be determined

Q.

Ring 'B' hovers on a positively charged ring 'A', as shown in the figure. The charge on ring B is

1. Positive
2. Negative
3. Neutral

Q. The velocity attained by electrons is known as:

1. Drift velocity
2. Electric charge
3. Electric field
4. Electric current

Q. Match the symbols to the corresponding components.

1. Resistor
2. Switch
3. Voltmeter

Q.

How does the resistance of a conductor depend on

1. Length of the conductor?
2. Area of cross-section of the conductor?
3. Temperature of the conductor?

Q.

What is the charge developed, if a body gains $50\times {10}^{18}$electrons by rubbing it with another body ?

1. $2C$

2. $16C$

3. $8C$

4. $-8C$

Q. The device which measures the electric potential difference between two points is called as .

1. ammeter
2. voltmeter
3. manometer
4. barometer

Q.

What will happen to the current passing through a conductor if the potential difference is doubled and the resistance is halved?

1. Remains unchanged

2. Becomes doubled

3. Becomes halved

4. Becomes four times

Q.

Define ohms law. How are potential differences, current, and resistance related to each other?

Q. In how much time (in seconds) should a charge of $10C$ flow between the two terminals so as to maintain a constant current of $100A$?

1. $\frac{1}{10}seconds$
2. $10seconds$
3. $110seconds$
4. $\frac{1}{110}seconds$

Q.

Which of the following is the correct set-up of a circuit?

1. ​

2. ​

3. 

4. 

Q. Ram wants to find out if a metal sphere is charged.

He took a new metal sphere, charged it positive and brought close to the first one. He noticed that they attract when close. He concluded that the first sphere must be negatively charged.
Did Ram get it right?

1. Yes

2. No