In radiation, which of the following has strong photons?

A. X-rays
B. Gamma
C. Microwave
D. Electromagnetic

Permanent hardness of water may be removed by the addition of___________?

A. Sodium carbonate
B. Alum
C. Potassium permanganate
D. Lime

Which of the following is not the name of any scientist?

A. Pauli exclusion principle
B. Hund’s rule
C. Aufbau’s principle
D. Le-chatelier’s principle

Vitamin C is essential for___________?

A. Appetite
B. Growth & repairing of tissues
C. Muscles
D. Brain

Who discovered that the earth was not the center of the universe?

A. Aristotle
B. Nicolaus copernicus
C. Sir isac newton
D. None

For the generation of biogas, the materials commonly used are__________?

A. Animal wastes
B. Forest residues
C. Aquatic plants
D. None of these

Which of these is NOT an example of a renewable energy source?

A. Wind energy
B. Solar
C. Coal
D. Hydroelectric power

Give Electronic configuration of Sodium:

A. 1s2,2s2,2p6
B. 1s2,2s2,2p6,3s2
C. 1s2,2s2,2p6,3s1
D. None of these

Air is a/an _________?

A. Compound
B. Element
C. Electrolyte
D. Mixture

The element used for the formation of alloys is__________?

A. Iron
B. Calcium
C. Mercury
D. Chromium