Question

A. Multiple choice questions.
1. A dry cell produces electric current by converting its
a. Chemical energy.
b. Heat energy.
c. Sound energy.
d. Light energy.
2. Which of the following is not a conductor of electricity
a. Copper.
b. Sea-water.
c. Air.
d. Human body.
3. All liquids are.
non-conductors of electricity except
a. Mercury.
b. Pure water.
c. Mobil-oild.
d.Vegetable oil.
4. Pure water becomes a conductor of electricity when added with
a. Drops of oil.
b. Saw dust.
c. Salt.
d. Plastic granules.
5. Which of these is a conductor of electricity?
a. Dry wood.
b. Graphite.
c. Diamond.
d. Cotton thread.
6. Electricity helps us with its:
a. Heat effect.
b. light effect .
c. Magnetic effect .
d. All the three .
7. A rod placed at the centre of a dry cell is made of
a. Zinc.
b. Wood.
C. Carbon.
d. None of these.​

Answer 1

1. Chemical energy

2. copper

3. Mercury

4. salt

5. dry wood

6. heat effect

7. wood

Answer 2

Answer:

A) Chemical energy

B) petrol

C) Mobil oil

D) Plastic granules

Explanation:

Chemical energy is the potential of a chemical substance to undergo a chemical reaction to transform into other substances. Some examples of storage media of chemical energy include batteries, food, and gasoline

Petrol are pure mineral oil which are generally insulator. petrol cannot conduct electricity but is a good conductor of heat. To be a good conductor of electricity the material or sample should produce or have ions in it to conduct the electricity,and ions are absent in petrol

Mobil, previously known as the Socony-Vacuum Oil Company, is a major American oil company that merged with Exxon in 1999 to form a parent company called ExxonMobil. It was previously one of the Seven Sisters that dominated the global petroleum industry from the mid-1940s until the 1970s.

solution. ... Thus, distilled water becomes a good conductor of electricity on dissolving a little of salt in it.