Physics - Study Mode

[#531] The instrument that measures and records the relative humidity of air is
Correct Answer

(B) Hygrometer

Explanation

Solution: A hygrometer is an instrument used to measure relative humidity. Humidity is the measure of the amount of moisture in the air. A psychrometer is an example of a hygrometer.

[#532] If there is a circular hole in a metal plate, what happens to the radius of the hole when the plate is heated?
Correct Answer

(A) Increases

Explanation

Solution: When a metal plate with a circular hole at its centre is heated, definitely along with the areal expansion of the plate the diameter of the circular hole also increases. Using the differential equations of coefficients of expansions, we find that the hole radius increases at the same linear rate as the metal.

[#533] The value of coefficient of restitution in perfectly elastic collision is
Correct Answer

(C) 1

Explanation

Solution: The value of coefficient of restitution in perfectly elastic collision is 1.

[#534] Which of the following device is best suited for measuring the temperature inside metallurgical furnaces?
Correct Answer

(A) Pyrometer

Explanation

Solution: Pyrometer is best suited for measuring the temperature inside metallurgical furnaces.

[#535] A wheel-barrow is an example of
Correct Answer

(D) Class II lever

Explanation

Solution: A wheel barrow is an example of second class lever as the load is between the fulcrum and effort,hence it is a second class lever.