CHEMISTRY CH14 Acids, Bases and Salts — Science STD 9 — Question

In longitudinal waves, the particle vibrates in a ………………….. direction of propagation.

How many metres are there in 1 nanometer?

Air sacs and Pneumatic bones are seen in ______.

Two cylindrical rods of same length have the area of cross section in the ratio 2:1. If both the rods are made up of same material, which of them conduct heat faster?

A plant is kept in a dark room for about 24 hours before conducting any experiment on photosynthesis in order to ……………………

One of the means of indirect transmission of a disease is ______.

Which one of the following pairs is not a poikilothermic animal?

Which is the incorrect statement in the following?

Which of the following is correct about uniform circular motion
(i) direction of motion is continuously changed
(ii) direction of motion is not changed
(iii) speed and direction both remain constant
(iv) speed is constant but direction is changing

________ have gill slits but do not have notochord.