Improvement in Food Resources — Science STD 9 — Question

Who is the father of microscopy and microbiology?

There are four elements P, Q, R and S having atomic numbers of 4, 18, 10 and 16 respectively. The element which can exhibit covalency as well as electrovalency will be:

1. P.
2. Q.
3. R.
4. S.

Living cells were discovered by:

Evaporation of a liquid at room temperature leads to _________ on the liquid surface:

One millionth of a metre is:

A boy of mass 50kg standing on ground exerts a force of 500N on the ground. The force exerted by the ground on the boy will be:

42. A bus moving along a straight line at 20m/s undergoes an acceleration of 4m/s². After 2 seconds, its speed will be:

1. 8m/s
2. 12m/s
3. 16m/s
4. 28m/s

The accelerated motion of a body changes due to change in:

If the temperature of an object is 268K, it will be equivalent to:

1. -5°C
2. +5°C
3. 368°C
4. -25°C

There are present numerous exotic breeds of poultry which have been successfully acclimatized in India. One of the most popular exotic breeds of fowl in India, which produces long white eggs, has a very small body size, so needs less feed for its maintenance. Choose the right name for the breed with all these characteristics.