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

A force is applied by an engine of a train of mass 2.05 × 10⁶kg changes its velocity from 5m/ s to 25m/ s min. The power of engine is:

Simple epithelium is a tissue in which cells are:

During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of:

Growing two or more crops in definite row pattern is:

1. Mixed farming.
2. Mixed cropping.
3. Inter-cropping.
4. Crop rotation.

A boy holds a mass on his stretched hand. Then

The ozone layer of the atmosphere blocks:

1. Infrared radiations.
2. Sunlight.
3. UV radiations.
4. Both UV and indrared radiation.

The nucleus of tritium consists of:

Each cell has a dense double membrane bounded structures inside it is called as:

In chronic disease a patient suffers from:

1. Poor appetite.
2. Short breath.
3. Tiredness.
4. All the above.

Which of the following precipitation reactions can be used to verify Law of Conservation of Mass?