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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
electroplating
electrodes
thermionic conduction
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Q 2. Electroplating is a method of :
making plates using electricity
plating a metal with another metal
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 :
positively charged electrode
negatively charged electrode
a positively charged ion formed in the electrolyte
a negatively charged ion formed in the electrolyte
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Q 4. Electric bell works on the principle of :
chemical effect of current
magnetic effect of current
heating effect of current
all of the above
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Q 5. Which of the following is an example of non electrolyte?
NaOH
HCI
{tex}CuSO_{4}{/tex}
{tex}CCl_{4}{/tex}
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Q 6. The anode during copper plating is :
Copper metal
article to be copper plated
iron metal
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
electrorefining
electrotyping
None of these
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Q 8. The process of electrolysis is used in :
extraction of metals
electroplating
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
LED
Magnetic compass
both (A) and (B)
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 :
Conductor
Insulator
Electrolyte
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 :
Electrolyte
Electrolysis
Electrode
None of these
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Q 12. The negatively charged ion formed when a chemical compound dissolves in water, is known as :
Cation
Anion
Cathode
Anode
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Q 13. The positively charged ion formed when chemical compound is dissolved in water is called :
Anion
Cation
Cathode
Anode
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Q 14. A vessel consisting of electrodes and the electrolysis is called :
Electrolyte
Voltmeter
Voltameter
None of these
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Q 15. The magnetic field around a current carrying coil lasts
for three hours
as longer current flows through it
till its half life period
field is permanent
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Q 16. Insulators have
low resistance
high resistance
high conductance
all of the above
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Q 17. Splitting a compound using electricity is called
electrolysis
electrolyte
electrokinesis
none of these
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Q 18. Which of the following combination of electrodes and electrolyte belong to a secondary cell?
zinc, carbon and ammonium chloride
zinc, silver oxide and potassium hydroxide
lead, lead oxide and sulphuric acid
copper, zinc and copper sulphate
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Q 19. Charge flows between two ends of a conductor when
same electric potential is present at the two ends
equal and same type of charges are present at the two ends
different electric potentials exists at the two ends of a conductor
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
iron cannot hold alignment for longer time even when the current is passing through the coil
magnetic properties of iron are weak
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
5
100
50
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Q 22. Fuse is made up of a wire whose
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
resistance is less than the effective resistance of the circuit
none of these
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Q 23. The protons inside the nucleus are held together by
Electrostatic force
Nuclear force
Gravitational force
None of these
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Q 24. A body acquires a positive charge by
Gaining protons
Gaining electrons
Loosing electrons
Loosing protons
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Q 25. A body acquires negative charge by
Gaining proton
Gaining electrons
Loosing electrons
Loosing protons