Chemical Effects of Electric Current — Science STD 8 — Question

Animals whose numbers are diminishing to level that they might face extinction is known as

The gas used in refrigerating appliance causing serious damage to ozone is

In India petroleum deposit was first found in the state of:

The wheel of a moving car is driven by the engine. The car is moving in the direction shown in the above diagram. In which direction, does the frictional force act on the wheel?

Boojho wants to know the preventing method which should not be listed?

Seed drill is used to:

Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. The correct arrangement is:

A device which works on the reflection of light from two plane mirrors arranged parallel to one another is:

What is the nature of the force which is experienced between an electron and a proton?