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- 1. Multiple Choice
What kind of change do you observe in the diagram given?
Electromagnetic change
Elctic change
Chemical change
Physical change
- 2. Multiple Choice
An electric current can produce
heating effect
chemical effect
magnetic effect
all of the above
- 3. Multiple Choice
Pure or distilled water is a
poor conductor
good conductor
Both
None of the above
- 4. Multiple Choice
Why do we add little dilute sulphuric acid to copper sulphate solution during electroplating?
To increase acidity
To increase conductivity
So that the colour becomes more prominent
To burn copper sulphate
- 5. Multiple Choice
Which of these is plated on the iron to prevent it from chemically reacting with food?
Gold
Chromium
Tin
Zinc
- 6. Multiple Choice
Out of the following, which metal is used to electroplate iron to make it shining and rust resistant?
Gold
Chromium
Zinc
Tin
- 7. 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.
- 8. Multiple Choice
Alloys of metals
allow electric current to flow through them
do not allow electric current to flow through them
sometimes allow and sometimes do not allow electric current to flow through them
None of these
- 9. Multiple Choice
The filament of the bulb gets heated to a high temperature due to the
magnetic effect of current
heating effect of current
chemical effect of current
all of these
- 10. Multiple Choice
Radhika wants to electroplate a plate with ZINC. She has a Zinc bar and the plate. But she does not know which should be the anode and which should be the cathode.
Zinc Bar - Anode, Plate - Cathode
Zinc Bar - Cathode, Plate - Anode
Both Anode and Cathode should be Zinc
- 11. Multiple Choice
Flow of electron is called
Electroplating
Electric current
Electrodes
Electrolyte
- 12. Multiple Choice
conductors can allow electricity because of the presence of
free ions
free electrons
free protons
atoms
- 13. Multiple Choice
During electrolysis of water,
hydrogen gas is produced
oxygen gas is produced
water is produced
both (a) and (b)
- 14. Multiple Choice
LED stands for
light emitting diode
light efficient diode
length emitting diode
light emitting device
- 15. Multiple Choice
Adding common salt to distilled water makes it
Good Conductor
Poor Conductor
No change
Both A and B
- 16. Multiple Choice
An electrolyte is
a metal
a solution
a liquid that conducts electricity
none of these
- 17. 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
- 18. Multiple Choice
Electroplating prevents
corrosion
passing of current
dissociation
shining
- 19. Multiple Choice
Which of the following does not conduct electricity?
(a) Sugar solution
(b) Vinegar solution
(c) Lemon juice solution
(d) Caustic soda solution
- 20. Multiple Choice
Tick the chemical effect of elecric current
boiling
motion
electro shock
Electroplating
- 21. 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
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