Tissues — Science STD 9 — Question

Name the gas which plays major role in global warming:

1. Carbon monoxide.
2. Nitrous oxide.
3. Carbon dioxide.
4. Sulphur dioxide.

The slope of a speed-time graph gives:

The atomic theory of matter was proposed by:

1. John Kennedy.
2. Lavoisier.
3. Proust.
4. John Dalton.

Four balls, A, B, C and D displace 10mL, 24mL, 15mL and 12mL of a liquid respectively, when immersed completely. The ball which will undergo the maximum apparent loss in weight will be:

1. A
2. B
3. C
4. D

In order to prove the law of conservation of energy in a freely falling object, Nakul followed the steps:
A: Found P.E. at the height ‘h’
B: Used v² = u² + 2as and (h - s) to find total energy after a fall of 's' metre.
C: Found K.E. just at the time of landing.
The sequence of steps are:

From the following 3 solids of the same shape and same volume which one has the highest inertia:

Write the approximate weight of a body of mass 5kg:

Which of the following statement is incorrect?

1. The particles of matter are very, very small.
2. The particles of matter attract one another.
3. The particles of some of the matter are moving constantly.
4. The particles of all the matter have spaces between them.

Which one of the following statements is not true?

1. The molecules in a solid vibrate about a fixed position.
2. The molecules in a liquid are arranged in a regular pattern.
3. The molecules in a gas exert negligibly small forces on each other, except during collisions.
4. The molecules of a gas occupy all the space available.

Sound travels in air if: