A. Oxygen
B. Hydrogen
C. Carbon Dioxide
D. Silicon
Oxygen is the most abundant element in the earth’s crust and silicon is next.
A. It would be impossible to use a kerosene lamp
B. The blotting paper would fail to function
C. There would have been no plants on earth
D. All of above
A. Audiosonic
B. Infrasonic
C. Ultrasonic
D. Supersonic
Sounds with frequencies below 20 hertz are called infrasound. Infrasound is too low-pitched for humans to hear. Sounds with frequencies above 20,000 hertz are called ultrasound.
A. Formic Acid
B. Tartic Acid
C. Glutamic Acid
D. Glutaric Acid
Sun is moving around the centre of the galaxy at a velocity of _______ km/s?
A. 205
B. 210
C. 215
D. 220
A. Bacteria
B. virus
C. Fungus
D. None of these