Physics - Study Mode

[#491] When hot-water is sprinkled on a hotter glass tumbler, it breaks because
Correct Answer

(B) Glass suddenly contracts

Explanation

Solution: If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel.

[#492] A gap is left between two rails of a railway track to accommodate...... of the metal.
Correct Answer

(C) Linear expansion

Explanation

Solution: A gap is left between two rails of a railway track to accommodate linear expansion of the metal.

[#493] Which of the following is arranged in order of decreasing conductivity?
Correct Answer

(D) Silver, Copper, Aluminium, Steel

Explanation

Solution: Silver, Copper, Aluminium, Steel is arranged in order of decreasing conductivity.

[#494] Every hot object emits ________
Correct Answer

(C) Infrared rays

Explanation

Solution: Every hot object emits infrared rays.

[#495] Which metal is the best conductor of heat?
Correct Answer

(A) Silver

Explanation

Solution: Silver is indeed the best conductor of heat among the metals listed in the options. It has the highest thermal conductivity of all metals and is known for its exceptional ability to conduct heat efficiently. So, the correct answer is Option A: Silver when considering the best conductor of heat among the provided options. Thank you for pointing out the clarification.