Tag: electric current through conductors

Quizzes (8) Questions (47)

Questions Related to electric current through conductors

Multiple choice physics electric current through conductors study about cells electric cell types of cells

What is the $-$ve terminal of dry cell made up of?

  1. Carbon rod

  2. Zinc plate

  3. Magnesium plate

  4. Cadmium rod
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The dry cell consists of a zinc can, electrolyte paste, and a carbon rod in the center. A chemical reaction takes place between the zinc can and the paste. Electrons flow from the negative (zinc) terminal to the positive (carbon) terminal. Electrons are then pumped back to the negative terminal.
Multiple choice physics electric current through conductors study about cells electric cell types of cells

In secondary cells:

  1. Chemical changes can be reversed by heating electrodes

  2. Chemical changes can be reversed by passing electric current

  3. Current is produced by photo chemical reactions

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Answer is B.

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. 

Multiple choice physics electric current through conductors study about cells electric cell types of cells

Three types of electric cells which provide current are:

  1. Button cell, solar cell & secondary cell

  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 physics electric current through conductors study about cells electric cell types of cells

What is the direction of flow of current inside a dry cell?

  1. from $+$ve to $-$ve terminal
  2. from $-$ve to $+$ve terminal
  3. from $+$ve to $+$ve terminal
  4. from $-$ve to $-$ve terminal
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The dry cell consists of a zinc can, electrolyte paste, and a carbon rod in the center. A chemical reaction takes place between the zinc can and the paste. Electrons flow from the negative (zinc) terminal to the positive (carbon) terminal. Electrons are then pumped back to the negative terminal.
Multiple choice physics electric current through conductors study about cells electric cell types of cells

The longer lead of a LED is always connected to the negative terminal of the battery and the shorter lead is connected to the posltlve terminal of the battery

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Answer is B.
The LED bulb has two leads. The lead connected to the positive terminal of battery is called anode and the lead connected to the negative terminal is cathode. The slightly longer lead than the other is always connected to the positive terminal and the shorter lead is connected to the negative terminal.
Hence, the given statement is false.

Multiple choice physics electric current through conductors combination of resistors combination of cells combinations of components

Two non ideal batteries are connected in series. Consider the following statements
(A) The equivalent emf is larger than either of the two emfs.
(B) The equivalent internal resistance is smaller than either of the two internal resistances.

  1. Both A and B are correct

  2. A is correct but B is wrong

  3. B is correct but A is wrong

  4. Both A and B wrong
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If we add two non ideal batteries in series then
so in case (a) the equivalent e.m.f.  may be larger than either of two e.m.f., but in case (b) the equivalent e.m.f. may be smaller than either of two e.m.f.
In series total resistance is always greater than individual resistance, whether batteries are connected in any way 

[i.e. either according to case (a) or case (b)].

Multiple choice physics electric current through conductors combination of resistors combination of cells combinations of components

When cells are connected in series greater emf is obtained in the circuit.

  1. True

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

When two or more cells are connected in series in a circuit, the total potential difference is the sum of their potential differences. Hence, the cells are connected in series in order to produce a larger total emf.