Gravitation — Science STD 9 — Question

Heart muscles are:

1. Voluntary and striated.
2. Involuntary and striated.
3. Voluntary and rnultinucleate.
4. Involuntary, striated and uninucleate.

Following are a few definitions of osmosis:
Read carefully and select the correct definition:

Crude oil is purified using fractional distillation process. This method works on the principle of:

Mammals:

1. Lay eggs.
2. Possess body hair.
3. Have a skin with scales.
4. All the above.

When a car runs on a circular track with a uniform speed, its velocity is said to be changing. This is because:

Smallest commercial unit of energy is:

The mass number of two atoms X and Y is the same (40 each) but their atomic numbers are different (being 20 and 18 respectively). X and Y are examples of:

The element which is required in largest quantity by plants is:

1. Sulphur
2. Calcium
3. Phosphorus
4. Nitrogen

___ is grown in mixed cropping:

The technique which is used to separate particles of a solid suspended in a liquid quickly is called: