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- 1. Fill in the Blank
LED stands for
- 2. Multiple Choice
To electroplate silver on Copper jewellery, the electrolyte that can be used is:
Copper Sulphate
Silver Nitrate
Ammonium Chloride
Sodium Chloride
- 3. Multiple Choice
In a conducting liquid electricity is conducted with the help of :
Proton
Neutron
Electron
Ions
- 4. Multiple Choice
Bicycle bells and wheel rims are electroplated with which metal?
Tin
Nickle
Chromium
Silver
- 5. Multiple Choice
Why is LED preferred to other type of bulbs?
It is cheap.
It works efficiently.
it can glow even when weak or less current flows through it.
it can glow even when high or more current flows through it.
- 6. Multiple Choice
Which one of the following solutions will not conduct electricity?
Lemon juice
Vinegar
Tap water
Vegetable oil
- 7. Multiple Choice
When electrodes are immersed in water and electricity passed, the bubbles formed on the positive terminal is actually _______ gas.
Hydrogen
Oxygen
Carbon dioxide
Nitrogen
- 8. Multiple Choice
The longer lead of LED is always connected to the ____ terminal of the battery.
Positive
Negative
Neutral
Can’t say
- 9. Multiple Choice
which of the following statements is/are correct?
The object to be electroplated is taken as the negative electrode
One of the most common applications of chemical effect of electric current is electroplating
Small amount of a mineral salt present naturally in water makes it a good conductor of electricity.
all of them are correct
- 10. Multiple Choice
Why are iron objects coated with zinc?
To make the objects shiny
To make the objects stronger
To protect the objects from corrosion
To make the objects lighter
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