Subject Experts Solutions for Chapter: Test Paper (Chapters 1 to 4), Exercise 1: Test Paper- 1 (Chapters 1 to 4)

A cubical solid of dimensions $2 \mathrm{cm}\times 2 \mathrm{cm}\times 2 \mathrm{cm}$ has a mass of $8.24 \mathrm{g}$. Determine its density and relative density when it is cut in half.

A force of $25 \mathrm{N}$ acting on a rigid body produces a moment of force $10 \mathrm{N} \mathrm{m}$. Determine the perpendicular distance between the point of application of force and the turning point.

A cuboid box weighing $300 \mathrm{N}$ is placed on the floor on its side with dimensions $4 \mathrm{m}\times 3 \mathrm{m}$. Determine the pressure exerted by it on the floor.

What is the kinetic energy of a car of mass $900 \mathrm{kg}$ moving with a velocity of $60 \mathrm{m} {\mathrm{s}}^{-1}$?

 A person of mass $50 \mathrm{kg}$ walks up the stairs to the fifth floor which is at a height of $10 \mathrm{m}$ from the ground. What will be the potential energy of the person when he reaches the fifth floor? [take $g=9.8 \mathrm{m} {\mathrm{s}}^{-2}$]

A ball is dropped from point $\mathrm{A}$ on a building at a height $h$ from the ground. Look at the figure and answer the given question.

Where is the potential energy of the ball maximum?

A ball is dropped from point $\mathrm{A}$ on a building at a height $\mathrm{h}$ from the ground. Look at the figure and answer the given question.

Where is the kinetic energy of the ball maximum?

A ball is dropped from point $\mathrm{A}$ on a building at a height $\mathrm{h}$ from the ground. Look at the figure and answer the given question.

Name the energy transformations taking place here.