Electric Current and Electric Cell

Q.

A cup contains $250g$ of water. Find the total positive charge present in the cup of water.

Q. Why do electrons flow from negative to positive and electric charge flows from positive to negative ??????????

Q.

In an external electric circuit, the current flows from________terminal to the________ terminal of the cell.

1. Positive, Negative
2. Negative, Positive
3. Neutral, Positive
4. None of the above

Q.

Which of the following can be source of electric current in a circuit?

1. Cell

2. Battery

3. Resistor

4. Switch

Q. If ${10}^9$ electron move out of a body to another body every second, how much time is required to get a total charge of 1 C on the other body?

Q.

A current through a horizontal power line flows in north to south direction. What is the direction of magnetic field (i) at a point directly below it and (ii) at a point directly above it?

Q.

In a torch, we use ___ as a source of electricity.

1. cell

2. switch

3. generator

4. mains

Q.

Which of the following is not a type of energy source?

1. Generator

2. Solar Cell

3. Rheostat

4. Battery

Q.

"Electric cell is a source of electricity".

1. True

2. False

Q. When the chemical energy inside the cell is used up, the cell stops producing electricity.

1. It stops working

2. It works more efficiently

Q.

When the chemicals in the electric cell are used up, the electric cell stops producing electricity. The electric cell is then replaced with a new one. In the case of rechargeable batteries (such – as the type used in mobile phones, cameras, and inverters), they are used again and again. How?

Q. The unit of electric current is which has been named after the scientist .

1. volts
2. ampere
3. Andre-Marie Ampere
4. Alessandro Volta

Q.

Electric current is said to be the flow of _____.

1. protons

2. neutrons

3. electrons

4. All of the above.

Q. In any electrical circuit, the direction of flow of current is:

1. Same as that of the flow of electrons.
2. Opposite to the flow of electrons.
3. Parallel to the flow of electrons.
4. Stationary.

Q. What is electricity?
how does it flow?

Q.

Write the conventions about the direction of flow of current.

Q.

___ is a collection of two or more cells.

Q.

In some situations even though the liquid is conducting, the bulb in the tester may not glow. Why? How do we test the conductivity in such cases? [3 MARKS]

Q.

The charge on $500cc$ of water due to proton will be

1. $2.67\times {10}^{7}C$
2. $1.67\times {10}^{23}C$
3. $6\times {10}^{23}C$
4. $6.1\times {10}^{27}C$

Q. What is called a electricity?

Q.

A proton moves along a horizontal line towards the observer. What will be the direction of concentric circular field lines of the magnetic field produced due to its motion?

Q.

Which of the following can use an electric cell for working?

1. All of these

2. Operating a remote control

3. Operating a walkie-talkie

4. Lighting a torch

Q.

Identify the energy conversion in an electrical cell.

1. Chemical to electrical energy

2. Electrical to mechanical energy

3. Electrical to chemical energy

4. Mechanical to electrical energy

Q. Which of the following is a part of the electrical circuit?

1. Battery only
2. Conducting wire only
3. Switch only
4. Battery, switch and conducting wire

Q.

An electric current is constituted by the flow of

1. neutrons.

2. electrons.

3. protons.

4. any one of them.

Q.

Metal cap of an electric cell is__________.

1. Neutral terminal of the cell

2. Positive terminal of the cell

3. All of these

4. Negative terminal of the cell

Q. Find electrovalency of AlCl3 and CaF2

Q.

Which of the following will conduct electricity?

1. Distilled water

2. Portable water

3. Well water

4. None of the above

Q.

An object moving at a constant speed in a circular path experiences a force that is

1. in the direction of motion

2. outwards and at $45°$ to the direction of motion

3. inwards and at right angles to the direction of motion

4. opposite to the direction of motion.

Q.

Which of the following uses an electric cell for working?

1. Lighting a torch

2. All of these

3. Operating a remote control

4. Operating a walkie-talkie