Questions

Equinox means the date when ___________.

Optical fiber works on the principle of -

In a hydrogen atom, an electron moves in an orbit of radius 5.0 x 10-11 m with a speed of 2.2 x 106 m/s. What is the equivalent current? (Electronic charge = 1.6 x10-19 C)

In the following items, each passage consists of six sentences. The first and the sixth sentence are given in the beginning as S1 and S6. The middle four sentences in each have been removed and jumbled up. These are labeled P, Q, R and S. You are required to find out the proper sequence of the four sentences and mark your response accordingly on the Answer Sheet.

S1 :There were shots as I ran.
S6:Staying submerged was only too easy with so much clothing and my army boots.
P:The water was icy, but I stayed until I thought my lungs would burst.
Q:I tripped at theedge and went in with a splash.
R:The minute I came up I took a breath and plunged down again.
S:I ducked down, pushed between two men and ran for the river.

The proper sequence should be

Which Vitamin is obtained from Sun rays?

A change in which no new substances are formed is called _____________.

On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because ________

Which of the following is a greenhouse gas or a gas which can deplete the ozone layer?