Is Matter Around Us Pure ? — Science STD 9 — Question

1. Low temperature, low pressure.
2. High temperature, low pressure.
3. Low temperature, high pressure.
4. High temperature, high pressure.

The relative densities of four liquids P, Q, R and S are 1.26, 1.0, 0.84 and 13.6 respectively. An object is floated in all these liquids, one by one. In which liquid the object will float with its maximum volume submerged under the liquid?

Ascaris lumbricoides in common roundworm of:

1. Liver.
2. Bile duct.
3. Large intestine.
4. Small intestine.

Ascariasis spreads through:

1. Vectors.
2. Contaminated food and water.
3. Formites.
4. Droplets.

An apple of mass 100g falls from a tree because of gravitational attraction between the earth and the apple. If the magnitude of force exerted by the earth on the apple be F₁, and the magnitude of force exerted by the apple on the earth be F₂, then:

1. F₁ is very much greater than F₂
2. F₂ is very much greater than F₁
3. F₁ is only a little greater than F₂
4. F₁ and F₂ are exactly equal.