First controlled fission of an atom was carried out in ________ on 1938.

A. U.s
B. Germany
C. Russia
D. U.k

What is the mass of one mole of Iodine?

A. 74g
B. 254g
C. 127g
D. 53g

Atoms of all the elements always contain in nucleus:

A. Proton and neutron
B. Neutron and electron
C. Proton
D. Neutron

Short sightedness is due to__________?

A. Shifting of the iris
B. Elongation of eyeballs
C. Weakening of the retina
D. Weaker muscles

Underground water and the water on the earth’s surface is called ?

A. Mezosphere
B. Ionosphere
C. Hydrosphere
D. None of these

What is total area of the earth?

A. 510.94 million km²
B. 492.102 million km²
C. 392.023 million km²
D. 692.192 million km²

Which planet is losing its atmosphere at faster than the earth?

A. Mecury
B. Venus
C. Mars
D. Jupiter

SONAR is based on the principle of___________?

A. Echo
B. Reverberation
C. Resonance
D. None of these

The color of blood is red due to __________?

A. Haemoglobin
B. Neutrophils
C. Esinophils
D. Hematocrit

Speed of object in one direction is called___?

A. Velocity
B. Acceleration
C. Space
D. Temperature