Prelims

Quartizite is metamorphosed from

Which of the following cell organelles play the most significant role in protein synthesis ?

An aqueous solution of copper sulphate is acidic in nature because the salt undergoes

In an atom, the order of filling up of the orbitals is governed by

Which one of the following is the correct sequence in increasing order of molecular weights of the hydrocarbons ?

Which one of the following is NOT radioactive ?

Which of the following distance-time graph (x – t) represents one-dimensinal uniform motion?

Assertion (A): A Chemical reaction becomes faster at higher temperatures. Reason (R): At higher temperatures, molecular motion becomes more rapid.

The following table shows the percentage change in the consumption of electricity by five towns P, Q, R, S, T from 1986 to 1988 .If town T consumed 500,000 units in 1986, how much did it consume in 1988 ?

A radioactive substance has a half-life of four months. Three-fourth of the substance would decay in