Tag: electricity

Quizzes (16) Questions (87)

Questions Related to electricity

Multiple choice types of cells electricity physics

Electro chemical equivalent of substance is 0.0006735 ; its eq. wt. is :

  1. 65

  2. 67.35

  3. 130

  4. cannot be calculated
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The electrochemical equivalent (Z) is related to equivalent weight (E) by the formula Z = E / F, where F is Faraday's constant (approximately 96500 C/mol). E = Z * F = 0.0006735 * 96500 = 64.99, which rounds to 65.

Multiple choice types of cells electricity physics

In a cell, electrons move from

  1. positive electrode to negative electrode.

  2. negative electrode to positive electrode.

  3. both A and B

  4. electrons do not move and only negative charge moves from one place to another place.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

We know that the current flows from positive electrode to negative electrode in a cell. The direction of electrons is always opposite to the direction of the current. Thus, the electrons move from negative electrode to positive electrode.  

Multiple choice types of cells electricity physics

Which one of the following statement is not true for Daniel cell ?

  1. The e.m.f. of this cell changes rapidly

  2. Some crystals of copper sulphate are added in it to make the solution saturated

  3. This cell was made first of all in 1850 by the scientist Daniel

  4. The hollow cylinder or the vessel of copper acts as the positive plate
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The e.m.f of a Daniel cell always remains constant and is equal to $1.08$ volts.

And  all the other statements given are true.

Multiple choice types of cells electricity physics

Direction of electric current inside the cell is from

  1. positive electrode to negative electrode.

  2. negative electrode to positive electrode.

  3. positive electrode to positive electrode.

  4. negative electrode to negative electrode.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When an external circuit is connected across the cell, electrons flow from negative electrode to positive electrode(current flows opposite to this) in the external circuit. Inside the cell, negatively charged ions are attracted to negative electrode because it is depleted of electrons. Similarly, inside the cell, positively charged ions are attracted to positive electrode. 

Hence inside the cell, current flows from negative electrode to positive electrode.

Multiple choice types of cells electricity physics

The common dry cell produces a voltage of

  1. $1.5 V$
  2. $4 V$
  3. $2 V$
  4. $3 V$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A common dry cell is zinc-carbon cell with a normal voltage of 1.5 V , same as the alkaline cell.

Multiple choice types of cells electricity physics

A battery converts chemical energy into

  1. mechanical energy

  2. solar energy

  3. electrical energy

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A battery converts chemical energy into electrical energy.


Answer-(C)

Multiple choice types of cells electricity physics

Which of the following is not the storage cell?

  1. Acid cell

  2. NIFE cell

  3. Edison cell

  4. Dry cell
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Dry cell being primary cell, cannot be recharged.
Acids cell are used as car batteries.
The nickel-iron battery (Ni-Fe battery)( also called Edison Cell)  is a rechargable battery having nickel(III) oxide-hydroxide positive plates and iron negative plates, with an electrolyte of potassium hydroxide. It is a very robust battery which is tolerant of abuse, (overcharge, overdischarge, and short-circuiting) and can have very long life even if so treated.

Multiple choice types of cells electricity physics

First electro chemical cell was designed by?

  1. Laclanche

  2. Faraday

  3. Galvanic

  4. Some one other than those mentioned above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The battery made by Volta is credited as the first electrochemical cell. It consists of two electrodes: one made of zinc, the other of copper. The electrolyte is either sulfuric acid mixed with water or a form of saltwater brine.

Multiple choice types of cells electricity physics

In which of the following cells polarisation is the major defect?

  1. Voltaic cell

  2. Daniel cell

  3. Leclanche cell

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

The chemical action that occurs in the cell while the current is flowing causes hydrogen bubbles to form on the surface of the anode. This action is called POLARIZATION. Some hydrogen bubbles rise to the surface of the electrolyte and escape into the air, some remain on the surface of the anode. If enough bubbles remain around the anode, the bubbles form a barrier that increases internal resistance. When the internal resistance of the cell increases, the output current is decreased and the voltage of the cell also decreases.

Voltaic cell has a lot of polarization due to ongoing reactions.Daniell cell is an improvement on the voltaic cell using two electrolytes and solves the problem of polarisation.

Multiple choice types of cells electricity physics

Which of the following effect of electric current is used in charging a battery of motor car?

  1. Magnetic

  2. Heating

  3. Chemical

  4. Induction
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The charging of all secondary batteries are based on conversion of electric energy to chemical potential energy with the user of battery charger. The negative terminal of the cell has to be connected to the negative terminal of the voltage source and the positive terminal of the voltage source with the positive terminal of the battery. Further, the voltage output of the source must be higher than that of the battery, but not much higher: the greater the difference between the power source and the battery's voltage capacity, the faster the charging process, but also the greater the risk of overcharging and damaging the battery.