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- 1. Multiple Choice
Which of the following metals is used in electroplating to make objects appear shining?
Iron
Copper
Chromium
Aluminium
- 2. Multiple Choice
Boojho’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory
in the nearby river.
in the nearby pond.
in the nearby cornfield.
according to the disposal guidelines of the local authority.
- 3. Multiple ChoiceWhich of the following statements is incorrect about the conductivity of water?Rain water is a good conductor of electricity.On addition of table salt, water conducts electricity.On addition of lemon juice, water conducts electricity.Water becomes a good conductor of electricity when heated.
- 4. Multiple ChoiceWhen current is passed through a mixture of water and lemon juice, bubbles rise from one of the electrodes. The bubbles are rising from the solution becauseof the heating effect of currentof the chemical effect of currentcurrent produces magnetic field around the electrodescurrent always produces air bubbles when passed through a liquid
- 5. Multiple Choice
LED stands for
light emitting diode
light efficient diode
length emitting diode
light emitting device
- 6. Multiple Choice
What kind of process don't go when observe the chemical effect of electric current
Formation of gas bubbles at the electrodes
Deposit of metal on the electrodes
Electric motor begin to move
Change in colour of the solution
- 7. Multiple Choice
Adding common salt to distilled water makes it
Good Conductor
Poor Conductor
No change
Both A and B
- 8. Multiple Choice
An electrolyte is
a metal
a solution
a liquid that conducts electricity
none of these
- 9. Multiple Choice
Flow of electrons is called
Electrode
Electrolyte
Electric current
Electroplating
- 10. Multiple Choice
Sugar solution is a good conductor of electricity.
True
False
- 11. Multiple Choice
Which one of the following solutions will not conduct electricity?
lemon juice
vinegar
tap water
vegetable oil
- 12. Multiple Choice
The object to be electroplated is taken as ____________ electrode.
cathode
anode
electrode
none of these
- 13. Multiple Choice
Small amount of a mineral salt present naturally in water makes it a______________ of electricity.
insulator
conductor
both a and b
none of these
- 14. Multiple Choice
conductors can allow electricity because of the presence of
free ions
free electrons
free protons
atoms
- 15. Multiple Choice
Electroplating prevents
electric current
chemical effect
lightening
rusting
- 16. Multiple Choice
Adding common salt to distilled water makes it
Good Conductor
Poor Conductor
No change
Both A and B
- 17. Multiple Choice
one of the following is not used for electroplating metal articles. the one is -
nickel
chromium
sodium
silver
- 18. Multiple Choice
The glowing of filament bulb is due to
Chemical effect of current
magnetic effect of current
Physical effect of electric current
Heating effect of electric current
- 19. Multiple Choice
You perform an experiment taking similar bulbs and cells but two different solutions A and B. You find that the bulb in the setup A glows more brightly as compared to that of the setup B. You would conclude that
higher current is flowing through the circuit in setup A
higher current is flowing through the circuit in setup B
equal current is flowing through both the circuits
No conclusion
- 20. Multiple Choice
The conductors among the following are
Hydrochloric acid
Sugar solution
Vinegar
Salt water
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