Dhiren M Doshi Solutions for Chapter: Test Papers 3, Exercise 1: TEST PAPERS

Name the appliances which work under the following energy transformation.

a. Sound energy into electrical energy.

b. Heat energy into mechanical energy.

How does the relative density of a solid substance determine whether it will float or sink in water?

Why are the chances of drowning in the Dead Sea very less?

The volume of $50 \mathrm{g}$ of a substance is $20 {\mathrm{cm}}^3$. If the density of water is $1 \mathrm{g}/{\mathrm{cm}}^3$, will the substance float or sink?

How does the force of attraction between the two bodies depend upon their masses and distance between them? Rahul, a class IX student, thought that two bricks tied together would fall faster than a single one under the action of gravity. Do you agree with this hypothesis or not? Give a reason for your answer.

Draw velocity-time graph for a uniformly accelerated object. Derive second and third equations of motion by graphical method.

State and prove the law of conservation of energy for a freely falling body.

Archimedes principle has wide application in making ships and submarines. Explain?