# Mechanics One Liner Questions & Answers

 Questions Answers 1 A simple machine helps a person in doing – The same amount of work with lesser force 2 A man is standing on a sensitive balance. If he inhales deeply, the reading of the balance – Increases 3 Which physical quantity is represented by the ratio of momentum and velocity of the body? Mass 4 Force is the product of – Mass and acceleration 5 If the number represents volume and surface area of a cube are equal, then the length of the edge of the cube in terms of the unit of measurement will be – 6 6 Energy conservation means – Energy can neither be created nor destroyed 7 The energy of wind is – Only kinetic 8 In wind power, which form of energy is converted into electrical energy? Kinetic energy 9 Newton’s first law of motion is known as – Law of Inertia 10 As the train starts moving, the head of the passenger sitting inside leans backward because of – Inertia of Rest 11 Static science is associated with – Situation of rest 12 It is more difficult to walk on the ice than on the road because – Ice has a lesser friction than the road. 13 For every action there is an equal and opposite reaction. The law was given by – Newton 14 A man jumped at a speed of 5 meters per second from a stationary boat and the boat moved off at the speed of 0.5 meters per second. How many times is the mass of the boat greater than that of the man? 10 times 15 A truck, a car, and a motorcycle have equal kinetic energies. If equal stopping forces are applied and they stop after traveling a distance of X, Y, and Z respectively, then – X = Y = Z 16 The ratio of kinetic energies of two bodies of the same mass is 4: 9, the ratio of their velocities will be – 2 – 3 17 Cycles and cars use ball bearings, because – The effective area of contact between the wheel and axle is reduced. 18 An oil tanker is partially filled with oil and moves forward on a level road with uniform acceleration. The free surface of oil then – Is inclined to the horizontal with a larger depth at the rear end 19 A batsman hits a cricket ball which then rolls on a level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because – There is a force on the ball opposing the motion 20 What is the correct equation for finding the acceleration? A = v-u/t 21 The working principle of a washing machine is – Centrifugation 22 The separation of cream from milk by churning is due to – Centrifugal force