Which of the following are the most penetrating?

In case of the neutral atoms, two isotopes differ in the number of

The age of most ancient geological formations is estimated by

Radioactive disintegration of uranium ultimately results in the formation of

No, two electrons in an atom can have the same set of four quantum member. This is stated as Pauli exclusion principle

The wavelengths of X-rays is of the order of

Atoms are composed of

In an atomic nucleus, neutrons and protons are held together by

Which of the following has the least penetrating power?

In 1775, a scientist proved that air is a mixture of two gaseous substances. Name the scientist.

Who discovered oxygen?

Gun powder was invented by

The cathode in the most common type of dry cell battery, consists of

The arrangement of elements in the modern periodic table is the work of

The scientist credited with the discovery of nobel gases is

Nobel Prize was started after the name of Alfred Nobel who invented the

Who was awarded the Nobel Prize for the prediction of the meson particles?

Electron was discovered by

Knot is the unit of speed of the which of the following?

The refractive index of light is measured by

Electric current is measured by

The dynamo is a device for converting

Kilohertz is a unit which measures

One kilometer is equal to how many miles?

When the reading of a barometer goes down it is an indication of