Tissues — Science STD 9 — Question

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

1. Sugar and water mixture.
2. Potash alum and water mixture.
3. Chalk powder and water mixture.
4. Potassium permanganate and water mixture.

Large schools of fishes in open sea are located with the help of:

Grit of pear is formed of:

Which of the following factors are responsible for the change in state of solid carbon dioxide when kept exposed to air?

1. Increase in pressure
2. Increase in temperature
3. Decrease in pressure
4. Decrease in temperature

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

The numerical ratio of displacement to distance for a moving object is:

Evaporation that occurs directly from the solid phase below the melting point is called as:

An object weighs 10N in air. When immersed fully in a liquid, it weighs only 8N. The weight of liquid displaced by the object will be:

1. 2N
2. 8N
3. 10N
4. 12N

A particle P has 18 electrons, 20 neutrons and 19 protons. This particle must be:

1. A molecule.
2. A binary compound.
3. An anion.
4. A cation.

An electric motor raises a load of 0.2kg, at a constant speed, through a vertical distance of 3.0m in 2s. If the acceleration power stations and thermal power stations, alternators produce electricity.

1. 0.3
2. 1.2
3. 3.0
4. 6.0

What is pulse rate of buffalo/ minute?

1. 6-18/ minute
2. 40-50/ minute
3. 40-60/ minute
4. 70-72/ minute