NCERT Solutions for Chapter: Work, Energy and Power, Exercise 1: MCQ-I

 A mass of $5 kg$ is moving along a circular path of radius $1 m$. If the mass moves with $300$ revolutions per minute, its kinetic energy would be 

 Which of the diagrams shown in figure most closely shows the variation in kinetic energy of the earth as it moves once around the sun in its elliptical orbit?

 Which of the diagrams represents variation of total mechanical energy of a pendulum oscillating in air as function of time?

Explain with reason, whether the shown curve can be a possible trajectory traced by a projectile (neglect air friction).

A raindrop falling from a height $h$ above ground, attains a near terminal velocity when it has fallen through a height $\frac{3}{4} h$. Which of the diagrams correctly shows the change in kinetic and potential energy of the drop during its fall up to the ground?
 

In a shot put event, an athlete throws the shot put of mass $10 \text{kg}$ with an initial speed of $1 m s^{-1}$ at ${45}^{\circ }$ from a height $1.5 \text{m}$ above ground. Assuming air resistance to be negligible and acceleration due to gravity to be $10 m{s}^{-2}$ , the kinetic energy of the shot put when it just reaches the ground will be :
 

Which of the diagrams correctly shows the change in kinetic energy of an iron sphere falling freely in a lake having sufficient depth to impart it a terminal velocity?

A cricket ball of mass $150 \text{g}$ moving with a speed of $126{\text{ km h}}^{-1}$ hits at the middle of the bat held firmly at its position by the batsman. The ball moves straight back to the bowler after hitting the bat. Assuming that collision between ball and bat is completely elastic and the two remain in contact for $0.001\text{ s}$, the force that the batsman had to apply to hold the bat firmly at its place would be :