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Who discovered the electron?
Sir J J Thomson

Which is the longest bone in the human body?
The femur or the thigh bone.

At which temperature do both the Centigrade and Fahrenheit show the same reading?
-40C equals -40F

Who invented the bifocal lens?
Benjamin Franklin

Why we do not feel pains to cut our nails?
Nails are not connected with cartilages or blood vessels. While cutting, therefore, the nervous system is not affected.

Who invented the jet engine?
Sir Frank Whittle of England in 1937

What is Mach Number?
Ratio of speed of the body to the speed of sound under similar conditions.

What is the scientific name for study of handwriting?
Graphology

What causes an object to look black?
When radiation falling on an object is fully absorbed, it appears black

Who discovered insulin?
Sir Frederick Grant Banting & J J R Macleod

Which element has the highest boiling point?
Tantalum, about 6000C

Why does a tennis ball bounce higher on hills than on plains?
The gravitational pull in the hills is less than that at plains

Which planet has the biggest satellite?
Saturn's seventh, known as Titan (diameter 5,680 km)

How do bats manage to avoid obstacles while flying?
Bats while flying, emit a set of short squeaks which are ultrasonic waves. These, after reflection from trees and buildings reach the ear of the bats and make them judge, by hearing the echo of the ultrasonic sound, the distance and direction of the obstacle in the air.

Which is the most common of all the metals in the earth's crust?
Aluminum, 8.13% of the earth's crust by weight

What is the source of caviar?
It is made by salting the roe of sturgeon

Why does an iron ball sink and not an iron ship?
The weight of the iron ball is more than the water it displaces, in case of the ship, it is opposite.

What is herpetology?
Study of reptiles

What is constellation?
A cluster of fixed stars in the heaven like Great Bear, Orion.

What is an aardvark?
An ant-eating animal

From which plant is morphine obtained?
Opium poppy

Who discovered the cause of malaria?
Ronald Ross