Force and Laws of Motion — Science STD 9 — Question

Why does a ship made of steel float on water while an oil-pin of steel sinks down?

Which one of the following is most likely to exhibit Tyndall effect?

The isotopes of an element contain:

Which of the following is gaseous fumigant?

1. DDT.
2. Aluminium phosphide.
3. Ethylene dichloride.
4. Methyl bromide.

The total force exerted by the body perpendicular to the surface is called:

Light waves:

A girl is pushing a box towards east direction. In which direction should her friend push the box so that it moves faster in the same direction?

Who believed that atoms could not be split:

A truck traveling due north at 50km/ hr turns west and travels at the same speed. What is the change in magnitude of speed:

Which of the following are Indian cattle?

1. Bos indicus.
2. Bos domestica.
3. Bos bubalis.
4. Bos vulgaris.

1. (i) and (iii)
2. (i) and (ii)
3. (ii) and (iii)
4. (iii) and (iv)