mcq on topic 4. Current Electricity and Magnetism

  1. ) If the cell has a potential difference of 3V, then the total potential difference of 2 cells will be 3V.

A ) True

B ) False

Ans B ) False

  1. ) Positive terminal of the dry cell

A ) Graphite rod

B ) Zinc layer

Ans A ) Graphite rod

  1. ) Positive terminal of the Lead-Acid cell.

A ) Lead dioxide electrode

B ) Lead electrod

Ans A ) Lead dioxide electrode

  1. ) Say True or False by observing the diagram of electric door bell.

An iron strip along with the striker is fitted near to the electromagnet.

A ) True

B ) False

Ans A ) True

  1. ) Electrons in the wire flow due to the potential difference between the two ends of a cell.

A ) True

B ) False

Ans A ) True

  1. ) Lithium ion cells are used in smart phones.

A ) True

B ) False

Ans A ) True

  1. ) Connection of cells in series.

A ) Cells

B ) Battery

C ) Plug key

Ans B ) Battery

  1. ) A large current flows when lightning takes place from a cloud to the ground.

A ) True

B ) False

Ans A ) True

  1. ) Say True or False by observing the diagram of electric door bell.

A copper wire is wound around on a copper piece in an electric door bell.

A ) False

B ) True

Ans A ) False

  1. ) Any one use of dry cell.

A ) Cars

B ) Wall clocks

C ) Solar cells

Ans B ) Wall clocks

  1. ) Electrical charge flowing through a wire in 1 second can be called …………….

A ) Coulomb

B ) Unit current

C ) Ampere

Ans B ) Unit current

  1. ) The paste that is filled outside the graphite rod in dry cell.

A ) Magnesium oxide

B ) Manganese dioxide

Ans B ) Manganese dioxide

  1. ) Magnetic field is created when an electric current flows in a wire.

A ) False

B ) True

Ans B ) True

  1. ) Find the odd one out

A ) Door-bell

B ) Bulb C ) Lamp D ) Torch

Ans A ) Door-bell

  1. ) cells are used in radio sets, wall clocks and torches.

A ) Lithium ion

B ) Dry

C ) Ni-Cd

Ans B ) Dry

  1. ) Negative terminal of the dry cell.

A ) Graphite rod

B ) Zinc layer

Ans B ) Zinc layer

  1. ) The potential difference produced by the Lead-Acid cell.

A ) 2V

B ) 1.2V

Ans A ) 2V

  1. ) Electric bulb glows when the circuit is closed.

A ) False

B ) True

Ans B ) True

  1. ) Electric current is a quantity.

A ) Scalar

B ) Vector

Ans A ) Scalar

  1. ) The chemical reaction in the dry cell proceeds ……………

A ) Slowly

B ) Very slowly

C ) Faster

Ans B ) Very slowly

  1. ) Electromagnets are used to produce weak magnetic field useful in scientific research.

A ) True

B ) False

Ans B ) False

  1. ) Say True or False by observing the diagram of electric door bell.

Electric bell is based on magnetic effect of electric current.

A ) False

B ) True

Ans B ) True

  1. ) In series connection, the positive terminal of one cell is connected to positive terminal of another cell.

A ) False

B ) True

Ans A ) False

  1. ) Moving charges get transferred from one object to the other.

A ) True

B ) False

Ans A ) True

  1. ) An atom has same number of positively charged protons and negatively charged electrons.

A ) True

B ) False

Ans A ) True

  1. ) Lithium ion cells cannot store more electrical energy than Ni-Cd cells.

A ) True

B ) False

Ans B ) False

  1. ) Any one use of Lead-Acid cell.

A ) Cars

B ) Wall clocks

C ) Solar cells

Ans A ) Cars

  1. ) Electric cells are connected in series to obtain smaller current.

A ) False

B ) True

Ans A ) False

  1. ) The difference of potential of two points.

A ) Electrostatic potential

B ) Potential difference

Ans B ) Potential difference

  1. ) Say True or False by observing the diagram of electric door bell.

The current is restored again when the iron strips comes in contact with the contact screw.

A ) True

B ) False

Ans A ) True

  1. ) is a source required to produce a uniform flow of charges in a circuit.

A ) Electric wire B ) Electric cell C ) Electric bulb

Ans B ) Electric cell

  1. ) An object does not show any charge though its atom contain charged particles.

A ) False

B ) True

Ans B ) True

  1. ) Ni-Cd cell delivers a potential difference of volts.

A ) 2

B ) 1.5

C ) 1.2

D ) 3

Ans C ) 1.2

  1. ) The shelf life of dry cell is than other electric cells using liquid.

A ) Shorter

B ) Longer

Ans B ) Longer

  1. ) The main function of electric cells is to maintain a potential difference between its two terminals.

A ) Variable B ) Constant C ) Stable

Ans B ) Constant

  1. ) We get current electricity when the protons in an electrical conductor are made to flow.

A ) False

B ) True

Ans A ) False

  1. ) The electrical level deciding the direction of flow of electrical charges.

A ) Electrostatic potential

B ) Potential difference

Ans A ) Electrostatic potential

  1. ) Electrolyte in the dry cell.

A ) Zinc chloride and Ammonium chloride

B ) Zinc ammonium chloride

Ans A ) Zinc chloride and Ammonium chloride

  1. ) Electricity was first observed by Hans Orested.

A ) True

B ) False

Ans B ) False

  1. ) Say True or False by observing the diagram of electric door bell.

When the striker hits the gong, the current continues to flow in the circuit.

A ) False

B ) True

Ans A ) False

  1. ) A magnetic needle is a …………… .

A ) Magnet

B ) Cell

C ) Key

D ) Battery

Ans A ) Magnet

  1. ) Lead-Acid cells are rechargeable.

A ) False

B ) True

Ans B ) True

  1. ) Say True or False by observing the diagram of electric door bell.

The current flows in the circuit when screw is in contact with the iron strip.

A ) False

B ) True

Ans B ) True

  1. ) Magnetic field is created around a wire when flows throught it.

A ) Electrolyte

B ) Electrostatic potential

C ) Electrical energy

D ) Electric current

Ans D ) Electric current

  1. ) Ni-Cd cells deliver 1.4V potential difference.

A ) False

B ) True

Ans A ) False

  1. ) The unit of potential difference is Voltage.

A ) False

B ) True

Ans A ) False

  1. ) Conventional current flows from negative terminal to the positive terminal of the cell.

A ) True

B ) False

Ans B ) False

  1. ) Say True or False by observing the diagram of electric door bell.

When the striker hits the gong, sound is produced.

A ) True

B ) False

Ans A ) True

  1. ) The connection in which many cells are connected in series is known as …………… .

A ) Battery

B ) Ni-Cd cells

C ) Dry cells

D ) Lead-acid cells

Ans A ) Battery

  1. ) Electrolyte in the Lead-Acid cell.

A ) Dilute Hydrochloric acid

B ) Dilute Sulphuric acid

Ans B ) Dilute Sulphuric acid

  1. ) Magnetic needle changes its direction when a bar magnet is brought close to it.

A ) True

B ) False

Ans A ) True

  1. ) Co-related terms

Torch : Light energy :: Door bell : ……………

A ) Sound energy

B ) Heat energy

Ans A ) Sound energy

  1. ) The system of coil and the screw is called an electromagnet.

A ) False

B ) True

Ans B ) True

  1. ) Electromagnets are permanent magnets.

A ) False

B ) True

Ans A ) False

  1. ) Find the odd one out

A ) Microphone

B ) Speakers

C ) Motor

D ) Dry cell

Ans D ) Dry cell

  1. ) Co-related terms

Wall clock : Dry cell :: Loudspeaker: ……………

A ) Electromagnets

B ) Chemical energy

Ans A ) Electromagnets

  1. ) Heat always flows from a body at a lower temperature to a body at a higher temperature.

A ) False

B ) True

Ans A ) False

  1. ) If each cell has a potential difference of 2 V, then the total potential difference when four cells are connected in series is …………… .

A ) 2 V

B ) 8 V C ) 0.5 V D ) 0 V

Ans B ) 8 V

  1. ) In absence of any cell, there is no current in the circuit.

A ) False

B ) True

Ans B ) True

  1. ) The SI unit of electric current is ……………

A ) Coulomb

B ) Ampere

C ) Volt

Ans B ) Ampere

  1. ) Negative terminal of the Lead-Acid cell.

A ) Lead dioxide electrode

B ) Lead electrode

Ans B ) Lead electrode

 

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