speed of sound in dry air at 20 °C is___________?

A. 353 m/s
B. 345 m/s
C. 343 m/s
D. None of them

The biggest planet in solar system is ______ and having _____ moons?

A. Uranus , sixteen
B. Jupiter, seventy-nine
C. Saturn, sixteen
D. Uranus, two

The lenses are used for the correction of:____________?

A. Long-sightedness
B. Short sightedness
C. Both a & b
D. None of those

The major component of honey is_________?

A. Glucose
B. Surcose
C. Maltose
D. Fructose

Dinosaurs and many other species were extinct about ________ years ago.

A. 55 million
B. 66 million
C. 75 million
D. 85 million

Animals use nitrogen in the form of_________?

A. Nitrogen
B. Nitrates
C. Nitrites
D. None of above

Which is the purest form of water?

A. Rain water
B. Heavy water
C. Tap water
D. None of these

Chronometer is invented by________?

A. Robert fulton
B. Nikola tesla
C. Martin cooper
D. John harrison

Wisdom teeth normally grow between the age of___________?

A. 34-40
B. 17-30
C. 45-55
D. 10-17

There is a hole in the Ozone Layer at__________?

A. South pole
B. North pole
C. Both a and b
D. None of these