Improvement in Food Resources — Science STD 9 — Question

In water, the proportion of oxygen and hydrogen by mass is:

1. 1 : 4
2. 1 : 8
3. 4 : 1
4. 8 : 1

A freely falling object eventually stops on reaching ground. What happens to its potential and kinetic energy while falling?

Which of the following statements is correct for a particle travelling with a constant speed:

The undefined nuclear region of prokaryotes are also known as:

Ronit often used to go with his father to collect milk from the milk man. One day, the milk man told his father that he is going to purchase a Murrah breed buffalo as he is not able tofulfill the demand of his customers to supply good quality milk. Ronit asked his father about the Murrah buffalo. Among the following statements which might not be the answer by his father?

Wind causes weathering of rocks through:

1. Chemical change.
2. Abrasion.
3. Mechanical force.
4. Frost action.

Goldstein’s experiments which involved passing high voltage electricity through gases at very low pressure resulted in the discovery of:

1. Electron.
2. Proton.
3. Nucleus.
4. Neutron.

Membrane which allows passage of only solvent through it is:

The ability of nitrogen fixation is found in:

1. Monerans only.
2. Both monerans and protistans.
3. Protistans only.
4. Fungi only.

Which condition out of the following will increase the evaporation of water?