BIOLOGY CH17 Animal Kingdom — Science STD 9 — Question

In a 100m race, the winner takes 10s to reach the finishing point. The average speed of the winner is

Quinine is a best drug for treatment of ………………..

In torches, searchlights and head lights of vehicles the bulb is placed …………………………… of the concave mirror.

The part of the AC generator that passes the current from the armature coil to the external circuit is ______.

Nerve cell does not contains ______.

Human lung is well adopted to breath at a pressure of ………….kPa.

The part of ear that turns pressure variations into electrical signals is .

Number of valence electrons in carbon is ______.

The formation of brown colour on the freshly unit surface of vegetables and fruits is because ………………. of organic compounds present in them.

The speeds of sound in four different media are given below. Which of the following is the most likely speed in ms-1 with which the two underwater whales in a sea can talk to each other when separated by a large distance?