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Class 8

Explore popular questions from Chemical Effects of Electric Current for Class 8. This collection covers Chemical Effects of Electric Current previous year Class 8 questions hand picked by experienced teachers.

Chemical Effects of Electric Current

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Q 1. The process by which a chemical change takes place in a substance when electric current is passed through it is called :

electrolysis

B

electroplating

C

electrodes

D

thermionic conduction

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Q 2. Electroplating is a method of :

A

making plates using electricity

B

plating a metal with another metal

C

coating any object with an electrically conducting plate

coating a metal with another metal by passing an electric current

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Q 3. Cathode is :

A

positively charged electrode

negatively charged electrode

C

a positively charged ion formed in the electrolyte

D

a negatively charged ion formed in the electrolyte

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Q 4. Electric bell works on the principle of :

A

chemical effect of current

magnetic effect of current

C

heating effect of current

D

all of the above

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Q 5. Which of the following is an example of non electrolyte?

A

NaOH

B

HCI

C

{tex}CuSO_{4}{/tex}

{tex}CCl_{4}{/tex}

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Q 6. The anode during copper plating is :

Copper metal

B

article to be copper plated

C

iron metal

D

none of these

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Q 7. The process of depositing a thin layer of a superior metal over an inferior metal with the help of electric current is called :

electroplating

B

electrorefining

C

electrotyping

D

None of these

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Q 8. The process of electrolysis is used in :

A

extraction of metals

B

electroplating

C

refining of metals

all of these

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Q 9. A weak current can be detected by replacing an electric bulb in an electric tester with

A

LED

B

Magnetic compass

both (A) and (B)

D

none of these

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Q 10. A solution of a chemical compound which conducts electric current and at the same time undergoes a chemical change is known as :

A

Conductor

B

Insulator

Electrolyte

D

None of these

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Q 11. The process due to which a solution of a chemical compound conducts electric current and at the same time undergoes chemical change is called :

A

Electrolyte

Electrolysis

C

Electrode

D

None of these

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Q 12. The negatively charged ion formed when a chemical compound dissolves in water, is known as :

A

Cation

Anion

C

Cathode

D

Anode

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Q 13. The positively charged ion formed when chemical compound is dissolved in water is called :

A

Anion

Cation

C

Cathode

D

Anode

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Q 14. A vessel consisting of electrodes and the electrolysis is called :

A

Electrolyte

B

Voltmeter

Voltameter

D

None of these

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Q 15. The magnetic field around a current carrying coil lasts

A

for three hours

as longer current flows through it

C

till its half life period

D

field is permanent

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Q 16. Insulators have

A

low resistance

high resistance

C

high conductance

D

all of the above

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Q 17. Splitting a compound using electricity is called

electrolysis

B

electrolyte

C

electrokinesis

D

none of these

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Q 18. Which of the following combination of electrodes and electrolyte belong to a secondary cell?

A

zinc, carbon and ammonium chloride

B

zinc, silver oxide and potassium hydroxide

lead, lead oxide and sulphuric acid

D

copper, zinc and copper sulphate

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Q 19. Charge flows between two ends of a conductor when

A

same electric potential is present at the two ends

B

equal and same type of charges are present at the two ends

different electric potentials exists at the two ends of a conductor

D

the potential difference between the ends is zero

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Q 20. The soft-iron ore of an electromagnet loses its magnetism once the current passing through the electromagnetic coil stops because

domains lose their alignment when the current is stopped

B

iron cannot hold alignment for longer time even when the current is passing through the coil

C

magnetic properties of iron are weak

D

domains inside the iron get aligned in north to south direction

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Q 21. In how many parts (equal) a wire of 100{tex}\Omega{/tex} be cut so that a resistance of 1{tex}\Omega{/tex} is obtained by connecting them in parallel?

10

B

5

C

100

D

50

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Q 22. Fuse is made up of a wire whose

A

melting point is greater than those of the metals used in the circuit

melting point is less than those of two metals used in the circuit

C

resistance is less than the effective resistance of the circuit

D

none of these

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Q 23. The protons inside the nucleus are held together by

A

Electrostatic force

Nuclear force

C

Gravitational force

D

None of these

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Q 24. A body acquires a positive charge by

A

Gaining protons

B

Gaining electrons

Loosing electrons

D

Loosing protons

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Q 25. A body acquires negative charge by

A

Gaining proton

Gaining electrons

C

Loosing electrons

D

Loosing protons