GRADE VIII ''Chemical Effects of Electric Current''

Sugar solution is a good conductor of electricity.

• True

• False

Tags

NGSS.MS-PS2-3

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.

Adding common salt to distilled water makes it

• Good Conductor

• Poor Conductor

• No change

• Both A and B

An electric current can produce

• heating effect only.

• chemical effect only.

• magnetic effect only.

• chemical, heating, and magnetic effects.

Tags

NGSS.HS-PS2-5

When electric current passes through a conducting solution, it causes _______ _______

• chemical reactions

• light effect

• magnetic effect

• nucleus reaction

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

Small amount of a mineral salt present naturally in water makes it a______________ of electricity.

• insulator

• conductor

• both a and b

• none of these

conductors can allow electricity because of the presence of

• free ions

• free electrons

• free protons

• atoms

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

Tags

NGSS.MS-PS2-3

NGSS.MS-PS1-2

LED stands for

• light emitting diode

• light efficient diode

• length emitting diode

• light emitting device