Gravitation — Science STD 9 — Question

A person standing between two vertical cliffs and 640m away from the nearest cliff shouted. He heard the first echo after 4 seconds and the second echo 3 seconds later. What is the distance between the cliffs?

Who among the following is the father of Indian cytology?

The radioactive isotope used in the treatment of cancer is:

1. Plutonium–239
2. Arsenic–74
3. Cobalt–60
4. Iodine–131

When a solid block is fully immersed in water, the volume of the water displaced is:

Milk is an example of :

The purpose of separating the components of a mixture is:

A freely falling object travels 4.9m in 1st second, 14.7m in 2nd second, 24.5m in 3rd second, and so on. This data shows that the motion of a freely falling object is a case of:

Name the property of matter due to which a body continues to be in its state of rest or uniform motion unless an external force acts on it:

Which crop is grown between two cereal crops in crop rotation?