Main constituent in air is ___________?

A. Oxygen
B. Nitrogen
C. Hydrogen
D. Helium

Combustion can not take place without __________?

A. Hydrogen
B. Air
C. Oxygen
D. Argon

The Aurora Borealis, also known as ________?

A. Western lights
B. Southern lights
C. Eastern lights
D. Northern lights

Wireless transmission can be done via _____________?

A. A infrared waves
B. Radio waves
C. Microwaves
D. All of these

Which one of the following elements the drum of a Photostat machine is made up of: _________?

A. Aluminium
B. Selenium
C. Barium
D. None of these

Which one of the following waves are used by the common TV remote control?

A. Radio waves
B. Lasers
C. Infrared waves
D. Ultrasonic waves

Who discovered carbohydrates fats and proteins?

A. William prout
B. Jons jacob berzelius
C. Anselme payen
D. Walter bradford cannon

Total number of moons in entire Solar System are:__________?

A. More than 100
B. More than 200
C. More than 300
D. More than 400

The process which is essential for continuing and survival of species is __________?

A. Digestion
B. Respiration
C. Reproduction
D. Excretion

The part of brain involved in balance and precision in movements is: __________?

A. Cerebrum
B. Cerebellum
C. Thalamus
D. Medulla oblongata