Mechanics — 6 Physics PYQs with Answers | UKPSC PYQ Hub

Question 1

The instrument which converts Electrical Energy to Mechanical Energy is–

Accepted Answer

Electric Motor. Electric Motor converts Electrical Energy to Mechanical Energy. A dynamo converts mechanical energy into electrical energy. Transformer converts electrical energy from one voltage and current level to another. Inductors are typically used as energy storage devices in switched-mode power devices to produce DC current.

Question 2

An apparatus used for locating submerged object is

Accepted Answer

Sonar. The acronym SONAR stands for Sound Navigation And Ranging. Sonar is a device that uses ultrasonic waves to measure the distance, direction and speed of underwater objects.

Question 3

Sonar makes use of _______.

Accepted Answer

Ultrasonic sound. To see the above explanation.

Question 4

Who invented Steam Engine?

Accepted Answer

James Watt. James Watt invented Steam Engine in 1769.

Question 5

The 'first' law of thermodynamics is related to which theory of conservation?

Accepted Answer

Energy. The First Law of thermodynamics is simply the general law of conservation of energy applied to any system in which the energy transfer from or to the surroundings is taken into account.

Question 6

The working principle of washing machine is

Accepted Answer

Centrifugation. Washing machine works on the principle of centrifugation. Centrifugation process is used to separate colloidal particles. Denser particles are forced to the bottom and the lighter particles stay at the top when spun rapidly.