RBSE Class 11 Physics Important Questions Chapter 1 Physical World

Rajasthan Board RBSE Class 11 Physics Important Questions Chapter 1 Physical World Important Questions and Answers.

RBSE Class 11 Physics Chapter 1 Important Questions Physical World

Multiple Choice Questions

Question 1.
Transistor was invented by:
(a) John Bardeen
(b) Lawrance
(c) Newton
(d) R.A. Millikan
Answer:
(a) John Bardeen

Question 2.
Inertia was discovered by:
(a) Newton
(b) Galileo
(c) Aristotle
(d) Kepler
Answer:
(b) Galileo

Question 3.
Cyclotron was discovered by:
(a) R.A. Millikan
(b) O. Lawrance
(c) Newton
(d) Edison
Answer:
(b) O. Lawrance

Question 4.
Electronic charge was invented by:
(a) R.A. Millikan
(b) A. A. Edison
(c) Albert Einstein
(d) Newton
Answer:
(a) R.A. Millikan

Question 5.
Cosmic Rays were discovered by:
(a) Pauli
(b) Grahm Bel
(c) V.E. Hess
(d) R.H. Hertz
Answer:
(c) V.E. Hess

Question 6.
The book titled "Principle" was written by:
(a) Newton
(b) Galileo
(c) Einstein
(d) Russel
Answer:
(a) Newton

Question 7.
"It is more important to have beauty in the equations of Physics than to have them agree with experiments." This statement was made by the scientist:
(a) Dirac
(b) Maxwell
(c) Raman
(d) Faraday
Answer:
(a) Dirac

Question 8.
An Indian scientist who won the Nobel prize for Physics is:
(a) J.C. Boss
(b) M.N. Saha
(c) H.J. Bhabha
(d) C.V. Raman
Answer:
(d) C.V. Raman

Questioin 9.
Prof. Albert Einstein got Nobel prize in Physics for his work on:
(a) General theory of relativity
(b) Theory of specific heats
(c) Photoelectric effect
(d) Special theory of relativity
Answer:
(c) Photoelectric effect

Question 10.
The value of universal gravitational constant (G) was first experimentally determined by,
(a) Newton
(b) Galileo
(c) Kelvin
(d) Cavendish
Answer:
(d) Cavendish

Question 11.
Lighting was discovered by:
(a) Edison
(b) Franklin
(c) Faraday
(d) Ohm.
Answer:
(b) Franklin

Question 12.
Loudness and intensity of sound was discovered by:
(a) Edison
(b) Bell
(c) Ohm
(d) Newton
Answer:
(b) Bell

Question 13.
The scientist who has been awarded the title of the father of Physics of 20th century, is:
(a) C.V. Raman
(b) Neils Bohr
(c) Madame Curie
(d) Albert Einstein
Answer:
(d) Albert Einstein

Question 14.
Which of the following is wrongly matched of:
(a) Coulomb's law-Charges
(b) Lactometer-Milk
(c) Barometer-Pressure
(d) Humidity-Calorimeter
Answer:
(d) Humidity-Calorimeter

Question 15.
The idea of calculus was given by:
(a) Newton
(b) Einstein
(c) Marconi
(d) Planck
Answer:
(a) Newton

Fill in the blanks

Question 1.
The law of inertia was proposed by the scientists ..............................
Answer:
Galileo Galilei

Question 2.
The weakest force in Nature is ..............................
Answer:
Gravitational

Question 3.
The strongest force in nature is ..............................
Answer:
Strongest nuclear force

Question 4.
The formula of mass-energy relation is ..............................
Answer:
E = mc²

Question 5.
The X-ray was proposed by the scientists ..............................
Answer:
W.K. Roentgen

Very Short Answer Questions

Question 1.
Who invented neutron?
Answer:
Scientist James Chadwick invented the neutron.

Question 2.
Who invented X-rays?
Answer:
Scientist Roentgen invented X-rays.

Question 3.
Which is the most strong force of short range force in nature?
Answer:
Nuclear force is the strongest force of short range.

Question 4.
Name the first Indian scientist honoured by Nobel Prize.
Answer:
Sir C.V. Raman.

Question 5.
Name the Indian scientist who derived new law from Einstein and Plank’s law.
Answer:
Scientist Satyendra Nath Bose.

Question 6.
What is Latin word after which word Science was developed?
Answer:
Scientia.

Question 7.
What is optics?
Answer:
Optics is the branch of Physics in which the events regarding light are studied.

Question 8.
Write the names of three latest discoveries of Physics.
Answer:
Super conductivity, computer, laser.

Question 9.
Write the names of scientists and their countries who invented radioactivity.
Answer:
Henry Becquerel, Madam Curie and Pierre Curie. All the three scientists were citizens of France.

Question 10.
Who provided the principle of relativity?
Answer:
Scientist Einstein.

Question 11.
Who invented electron?
Answer:
J.J. Thomson.

Question 12.
Who presented first the nucleus model of atom?
Answer:
Rutherford.

Question 13.
Compare the intensities of four fundamental forces.
Answer:
Gravitational force : electromagnetic force : strong nuclear force :    Weak nuclear force
= 1 : 10³⁶ : 10³⁹ : 10²⁵

Question 14.
What is the fundamental force due to which protons of nucleus remain bounded?
Answer:
By nuclear force.

Question 15.
Who invented telephone?
Answer:
Scientist Graham Bell.

Question 16.
Which is the most weak fundamental force?
Answer:
Gravitational force.

Question 17.
Which quantity remains conserved when external force on the system is zero?
Answer:
Linear momentum.

Question 18.
Which scientist presented the law of equivalence of mass and energy?
Answer:
Einstein.

Question 19.
Who presented the law of magnetic effect of electric current?
Answer:
Einstein.

Question 20.
With which scientific invention is the name of Maxwell related?
Answer:
Principle of electromagnetic waves.