chemical effects of current

An electric current can produce

• heating effect only.

• chemical effect only.

• magnetic effect only.

• chemical, heating, and magnetic effects.

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.

Which one of the following solutions will not conduct electricity?

• lemon juice

• vinegar

• tap water

• vegetable oil

Which of the following metals is used in electroplating to make objects appear shining?

• iron

• aluminium

• copper

• chromium

Which of the following solutions will not make the bulb in Fig 14.2 glow?

(a)

(b)

(c)

(d)

• sodium chlorides

• copper sulphate

• silver nitrate

• sugar solution in diluted water

Tick the chemical effect of elecric current

• boiling

• motion

• electro shock

• Electroplating

Which 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.

Which of the following liquid is not a good conductor of electricity?

• Orange juice
• Tap water
• Vinegar
• Honey

When 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 because

• of the heating effect of current
• of the chemical effect of current
• current produces magnetic field around the electrodes
• current always produces air bubbles when passed through a liquid

LED stands for

• light emitting diode

• light efficient diode

• length emitting diode

• light emitting device