Atoms and Molecules — Science STD 9 — Question

Which would have a greater effect on the kinetic energy of an object: doubling the mass or doubling the velocity?

Name the process you would use to separate a mixture of two miscible liquids (like acetone and water).

With which physical quantity should the speed of a running bull be multiplied so as to obtain its momentum?

When a ball is thrown vertically upwards, its velocity goes on decreasing. What happens to its potential energy as its velocity becomes zero?

In the following questions, a statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as:

1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
2. If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
3. If Assertion is true, but Reason is false.
4. If Assertion is false, but Reason is true.
5. If both Assertion and Reason both are false.

Assertion: In crop rotation, two or more crops are grown together on same land.
Reason: It ensures maximum utilisation of nutrients supplied.

Write the molecular formulae for the following compounds.
Calcium (II) phosphate.

What happens to the pitch of a sound if its frequency increase?

Which would have a greater effect on the kinetic energy of an object: doubling the mass or doubling the velocity?