Tag: electricity

Quizzes (16) Questions (87)

Questions Related to electricity

Multiple choice types of cells electricity physics

When the ends of metal wire are not connected to a battery

  1. electrons move from positive electrode to negative electrode.

  2. electrons move from negative electrode to positive electrode.

  3. electrons move in random directions.

  4. protons move in random direction in such a way that their net movement in a unit volume is zero.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When the ends of the metal wire are not connected to a battery, no electric field is produced inside the wire. Thus no force acts on the electrons in the wire. So the electrons collide with each other and move in random directions.

Multiple choice types of cells electricity physics

Nickel Cadmium cells are used in

  1. very long-life applications

  2. devices with high limitation on spaces.

  3. portable machines that run on electricity.

  4. all of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nickel cadmium cells are used in portable machines that run on electricity. It is rechargeable.

Multiple choice types of cells electricity physics

Button cell is also called as

  1. lithium cell.

  2. nickel-cadmium cell

  3. dry cell

  4. leclanche cell
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Lithium cell has a negative plate of lithium iron phosphate and a positive plate of carbon. It is also called as button cell.

Multiple choice types of cells electricity physics

When an electron moves from negative electrode to positive electrode

  1. negative charge moves from negative electrode to positive electrode.

  2. positive charge moves from positive electrode to negative electrode.

  3. no charge flows from either electrode to other electrode.

  4. both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Electrons are termed as negative charged particles. Thus when electrons move from negative electrode to positive electrode, we say that negative particles move from negative electrode to positive electrode. On the other hand, the positive charges get attracted towards the negative electrode, thus they move from positive electrode to negative electrode.

Multiple choice types of cells electricity physics

Which one works with the help of dry cell?

  1. Torches

  2. Transistors, toys

  3. T.V.remotes

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Dry cells (Leclanche cells) are portable power sources commonly used in low-drain devices like torches, toys, and remote controls.

Multiple choice types of cells electricity physics

State whether true or false:
The used up chemicals in a dry cell can be re-obtained by charging it.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Dry cell are not rechargeable.

Multiple choice types of cells electricity physics

Out of the following the one which is a source of e.m.f is:

  1. voltaic cell

  2. dynamo

  3. thermocouple

  4. lous speaker
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A voltaic cell is an electrochemical cell that produces electrical energy. In voltaic cell there is an anode where oxidation occurs and a cathode where reduction occurs. So, it produces current and thus emf is produced in voltaic cells.

Multiple choice types of cells electricity physics

For a cell reaction involing a two-electron change, the standard e.m.f of the cell is fonud to be$0.295V$ at $25^{o}C$. The equilibrium constant of the reaction at $25^{o}C$ will be:

  1. $10$
  2. $1\ \times 10^{10}$
  3. $1\ \times 10^{-10}$
  4. $29.5\ \times 10^{-2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The relationship between the standard cell potential and the equilibrium constant is given by the Nernst equation at 298K as log(K) = (n * E_cell) / 0.0591. Substituting n = 2 and E_cell = 0.295V yields log(K) = 10, which means K equals 10 to the power of 10. Thus, option B is the correct mathematical outcome.

Multiple choice types of cells electricity physics

The electric cell is a device to obtain ?

  1. electric charge

  2. electric force

  3. electrons

  4. electric energy from chemical energy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

It is a common misconception that battery or cell delivers charge but this is not true at all.The battery as a whole is electrically neutral and its only job is to provide electrical energy.This is usually done using conversion of chemical energy to electric energy.

Multiple choice types of cells electricity physics

An electrochemical cell stops working after some time because

  1. Electrode potential of both the electrodes become zero.

  2. Electrode potential of both the electrodes become equal.

  3. One of the electrode is eaten away.

  4. The reaction starts proceeding in opposite direction.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An electrochemical cell functions by utilizing a potential difference between its two half-cells to drive electrons through a circuit. When the cell reaches chemical equilibrium, the potential difference drops to zero because the electrode potentials of both half-cells become equal, stopping current flow.