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# Top 50 Science GK Questions and Answers

Rajesh Bhatia3 months ago 11.4K Views

science questions and answers.pdfBasic Science is an essential topic covered in the General Knowledge section. In this Basic Science GK section, Physics, Chemistry, and Biology questions and answers are provided and these types of questions are asked in any competitive exams. In this blog, all Science GK Questions are based on special theories, research, and rules.

## Science GK Questions

Here, I am sharing the Top 50 Science GK Questions and Answers related to Physics, Chemistry, and Biology GK. The Basic Science GK section is the important section of General Science. In many competitive exams, these types of questions are asked in the General Science section. So, improve your science gk knowledge to read this blog.

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## Science GK Questions

Q :

What is called molar mass?

(A) Ethanol

(B) Mass expressed in grams of one mole of substance.

(C) Hydrogen atom

(D) Oxygen

Explanation :

In chemistry, the molar mass of a chemical compound is equal to the ratio of the mass of a sample of that compound and the amount (in moles) of the substance present in that sample. Its SI unit is kilogram/mol. But gram/mol is its practical unit.

Q :

According to the law of mass conservation, the number of atoms of each element on both sides of the balanced equation?

(A) unequal

(B) all are wrong

(C) is the same

(D) not certain

Explanation :

However, to show the law of conservation of mass in an equation, the chemical equation must be completely balanced. Using coefficients to create a balanced chemical equation equals the number of each type of atom in the reaction on each side of the equation.

Q :

What is the meaning of the word atomic?

(A) Uncut

(B) Atom

(C) Tubes

(D) Molecular Tubes

Explanation :

The word 'atom' originates from the Greek language, in which atomio means 'uncutable' or 'indivisible'.

Q :

After whom is the SI unit of periodic (v) named?

(A) Bore

(B) Heinrich Hertz

(C) Rutherford

(D) None of these

Explanation :

The SI unit of frequency is Hertz, which is represented by the symbol Hz. It is named after Heinrich Hertz, the German physicist who discovered electromagnetic radiation.

Q :

Flame will come out from saturated hydrocarbon.

(A) Yellow

(B) Unclean

(C) Clean

(D) Black

Explanation :

Saturated hydrocarbons burn with a blue flame and unsaturated hydrocarbons burn with a sooty flame.

Q :

What is the science developed keeping in mind the dual behaviour of matter called?

(A) Atomic orbital

(B) Economics

(C) Quantum Mechanics

(D) Chemistry

Explanation :

Quantum mechanics was developed keeping in mind the dual behavior of matter. Quantum mechanics is a theoretical science, in which the motions of those microscopic objects are studied, which show the properties of both waves and particles. It determines the laws of motion of such objects.

Q :

The square of the wave function at a point shows the probability of electron density at that point. Who said this?

(A) Louis

(B) Max Born

(C) Peter Debay

(D) Erwin Schrödinger

Explanation :

Born's law states that the probability density of finding a particle at a particular state is proportional to the square of the modulus of the wave function at that point.

Q :

According to which rule are electrons filled in the orbitals of different atoms?

(A) Offbau's rule

(B) Octave rule

(C) Mendeleev's period

(D) Effective nuclear charge

Explanation :

Key Features of the Aufbau PrincipleAccording to the Aufbau principle, electrons first occupy the lowest energy orbitals. This indicates that electrons enter higher-energy orbitals only when the lower-energy orbitals are completely occupied.

Q :

Who said that light waves are related to oscillating electrical and magnetic behaviour?

(A) Maxwell

(C) Millikan

(D) Newton

Explanation :

Maxwell showed for the first time that light waves are related to oscillating electric and magnetic behavior.

Q :

Who put forward the idea that the ratio of masses of elements in a compound is always the same?

(A) Abogodra

(B) Lewis

(C) Joseph Proust

(D) John Dalton

Explanation :

Proust had expressed this law in this way, “The elements in any compound are always present in the ratio of definite masses”. He was born in a family. At the age of twelve, he started his career as a teacher. Seven years later he became principal of a John Dalton school.