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Worksheetsclass 8 revision
Total questions: 10
Worksheet time: 10mins
Dev’s uncle has set up an electroplating factory near his village. He should dispose of the waste of the factory ?
IN THE RIVER
IN THE NEARBY CORNFIELD
IN THE NEARBY POND
ACCORDING TO THE DISPOSAL GUIDELINES OF LOCAL AUTHORITY
An electric current can produce__________
HEATING EFFECT ONLY
CHEMICAL EFFECT ONLY
MAGNETIC EFFECT ONLY
CHEMICAL HEATING AND MAGNETIC EFFECTS
When an electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates________________ ?
HEATING EFFECT OF ELECTRIC CURRENT
CHEMICAL EFFECT OF ELECTRIC CURRENT
MAGNETIC EFFECT OF ELECTRIC CURRENT
NONE OF THESE
They found 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 ON SETUP 'A'
HIGHER CURRENT IS FLOWING IN SETUP 'B'
THE CURRENT IS FLOWING THROUGH BOTH CIRCUITS
THE CURRENT IS NOT FLOWING
Which one of the following solutions will not conduct electricity?
TAP WATER
VINEGAR
VEGETABLE OIL
LEMON JUICE
Which of the following metals is used in electroplating to make objects appear shining?
IRON
COPPER
CHROMIUM
ALUMINIUM
Which of the following solutions will not make the bulb in Fig 14.2 glow?
SUGAR SOLUTION IN DILLUTED WATER
SALT SOLUTION
SUGAR SOLUTION
NONE OF THE ABOVE
The object to be electroplated is taken as ____________ electrode.
CATHOD
CATHODE
DECATHOD
NONE OF THE ABOVE
One of the most common applications of chemical effect of electric current is ______________.
ELECTRIC EFFECT
ELECTROPLATED
ELECTROPLATING
NONE OF THE ABOVE
Small amount of a mineral salt present naturally in water makes it a______________ of electricity.
HEATER
INSULATOR
ELECTRICAL
CONDUCTOR
