Tag: electricity

Quizzes (16) Questions (87)

Questions Related to electricity

Multiple choice physics electricity electric cells and batteries

When the two terminals of a battery are connected directly with a wire then:

  1. More electrical energy is stored in the cell

  2. The chemicals get used up very fast

  3. No current flows in the wire

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
When the two terminals of a battery are connected directly with a wire there will be a low resistance path for the current to flow. The wire will get heated a little bit (depends on the diameter of the wire less the diameter more heat) and the battery will be quickly discharged. During depletion, it may become very hot, emit gasses, and possibly explode. The shorting wires will draw heavy current that may melt the wire or even cause them to soften and break.
Multiple choice physics electricity electric cells and batteries

Many devices such as.............. use batteries-

  1. Torches

  2. Transistors, toys

  3. T.V. remote controls

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

Many devices such as----------------use battery 

Torches 
Transistors, toys 
T.V remote controls
All of these use batteries.

Multiple choice types of cells electricity physics

Three types of electric cells which provide current are:

  1. Button cell, solar cell & secondary ceil

  2. Solar cell, electrolytic cell, electro chemical cell

  3. (A) and (B) both are correct

  4. Neither (A) nor (B) is correct
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Answer is C.

When a primary cell is used, chemical reactions in the battery use up the chemicals that generate the power; when they are gone, the battery stops producing electricity and is useless. In contrast, in a secondary cell, the reaction can be reversed by running a current into the cell with a battery charger to recharge it, regenerating the chemical reactants. 
The types of cells mentioned in option A and option are correct.
Hence, option C is correct.

Multiple choice types of cells electricity physics

Which one of the following solutions can be electrolysed ?

  1. Mercury

  2. Distilled water

  3. Solution of common salt

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

When dissolved in fluid, salts tend to break apart into their component ions, creating an electrically-conductive solution. Common salt is one such salt. common salt is  $ NaCl$ which gives $Na^+$ and $Cl^-$.

Multiple choice types of cells electricity physics

State whether true or false : 
There is no electrolyte in a dry cell.

  1. True

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

Ammonium chloride, as a paste, is the electrolyte in a dry cell. Hence the above statement is false.

Multiple choice types of cells electricity physics

Which one of the following primary cells has e.m.f. $1.08  V$ and which remains fairly constant ?

  1. Daniel cell

  2. Simple voltaic cell

  3. Leclanche cell

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

the Daniel cell is a type of electrochemical cell invented in 1836. it is consisted of a copper pot filled with a copper sulfate solution , in which was immersed an unglazed earthenware container filled with sulfuric acid and a zinc electrode. Daniel cell is also called Zn-Cu cell and has constant e.m.f of 1.08 volts.

Multiple choice types of cells electricity physics

To remove the polarisation defect in Daniel cell ?

  1. Zinc rod is coated with a thin layer of mercury

  2. Potassium bi-chromate is used

  3. The cell should be kept in open air

  4. Copper-sulphate is used
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A depolarizer in electrochemistry is a synonym of electroactive substance, i.e., a substance which changes its oxidation state, or partakes in a formation or breaking of chemical bonds, in a charge-transfer step of an electrochemical reaction. In the cells, the term "depolarizer" has been used to denote a substance used in a primary cell to prevent buildup of hydrogen gas bubbles.

The hydrogen ions displace metal from the salt so that metal, instead of hydrogen, is deposited on the positive plate. For example, copper-sulphate in Daniel cell.

Multiple choice types of cells electricity physics

In a cell, by convention, electron is taken to be flowing from

  1. positive electrode to negative electrode.

  2. negative electrode to positive electrode.

  3. both A and B

  4. none of the above.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

By convention, current is assumed to travel from positive to negative direction. The electrons travel from negative to positive. The direction of current is not the same as direction of flow of electrons; they are opposite.

Multiple choice types of cells electricity physics

Which among the following is a standard cell ?

  1. Daniel cell

  2. Cadmium cell

  3. Leclanche cell

  4. Lead accumulator
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ideal qualities of standard cells as follows:
(1) The cells must be constructed from high purity materials and be reproducible.
(2) Except when current is flowing there should be no chemical reaction taking place in the cell.
(3) When the cell is thermally cycled it must give the same emf at a given temperature regardless of its thermal history.
(4) When a current is passed through the cell, its emf may change, but it must recover rapdidly and completely on cessation of the current.

(1) to (4) above represent an ideal qualities which only the Weston Standard cell approaches. The Weston Standard cell is constructed with the basic materials- mercury, cadmium, sulfuric acid, and water- are all purified by distillation, starting with the purest materials available. Hence out of given cells cadmium cell is the standard cell.

Multiple choice types of cells electricity physics

In daily life, dry cell is used in 

  1. Fan

  2. Alarm clock

  3. Tubelight

  4. All out(Mosquito repellant)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Alarm clock uses Dry Cell. Rest of the components work on power supply.