Physics - Study Mode

[#686] Materials that usually are good conductors of electricity?
Correct Answer

(A) Aluminium

Explanation

Solution: Aluminium is good conductors of electricity.

[#687] Pure water is bad conductor of electricity because it is
Correct Answer

(A) Feebly ionized

Explanation

Solution: Pure water is a bad conductor of electricity. Pure water does not contain any impurities or ions resulting in neutral ions present in it. In the absence of electrons no solution or water can conduct electricity as ions carry electric charge and conduct electricity.

[#688] The metal whose electrical conductivity is more, is
Correct Answer

(C) Silver

Explanation

Solution: The most electrically conductive metal is silver.

[#689] Which of the following is a conductor of electricity ?
Correct Answer

(C) Salt water

Explanation

Solution: Salt water is a conductor of electricity.

[#690] A bird sitting on a high tension electric wire does not get electrocuted because
Correct Answer

(C) It does not form a closed path for the flow of current

Explanation

Solution: Birds don't get electrocuted on power lines because electricity does not move through their bodies when they sit on them. When the bird sits with both its feet on the electrical wire, their legs have an equal electrical potential so the electricity will not move throughout the bird's body.