General Science MCQs

Question 1

Which of the following shows the masses of the three elementary particles in decreasing order?

Accepted Answer

Baryons, Mesons, Leptons

Answer

Leptons, Baryons, Mesons

Answer

Mesons, Baryons, Leptons

Answer

Leptons, Mesons Baryons

Question 2

What is the wavelength of visible spectrum?

Accepted Answer

3900 - 7600 angstrom

Answer

8500 - 9800 angstrom

Answer

7800 - 8000 angstrom

Answer

1300 - 3000 angstrom

Question 3

Which of the following has a least penetrating power?

Accepted Answer

Alpha particles

Answer

All have same penetrating power

Answer

Beta Particles

Answer

Gamma rays

Question 4

The isotope of uranium capable of sustaining chain reaction is

Accepted Answer

U-235

Answer

U-245

Answer

U-239

Answer

U-238

Question 5

The age of most ancient geological formations is estimated by

Accepted Answer

Uranium - lead method

Answer

Ra - Si method

Answer

Potassium - argon method

Answer

C14 method

Question 6

Who suggested that most of the mass of the atom is located in the nucleus?

Accepted Answer

Rutherford

Answer

Thompson

Answer

Bohr

Answer

Einstein

Question 7

The dark lines in the solar spectrum are due to

Accepted Answer

Absorption of corresponding wavelengths by the outer layers of the sun.

Answer

Destructive interference between waves of certain definite wavelengths.

Answer

Absorption of corresponding wavelengths by the prism used in the photograph.

Answer

Absence of corresponding wavelengths from the light emitted by the core of the sun.

Question 8

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

Accepted Answer

Exchange forces

Answer

Gravitational forces

Answer

Coulombic forces

Answer

Magnetic forces

Question 9

'No two electrons in an atom can have the same set of four quantum numbers' is stated in

Accepted Answer

Pauli's exclusion principle

Answer

Newton's law

Answer

Bohr's law

Answer

Aufbau principle