AP Inter 1st Year Physics Important Questions Chapter 1 Physical World

Students get through AP Inter 1st Year Physics Important Questions 1st Lesson Physical World which are most likely to be asked in the exam.

AP Inter 1st Year Physics Important Questions 1st Lesson Physical World

Very Short Answer Questions

Question 1.
What is physics? [AP, TS 15,16]
Answer:
Physics is a branch of science which deals with the study of the basic laws of nature and their demonstration in different phenomena.

Question 2.
What is the discovery of C.V. Raman? [AP 16,18,19,20,2211; TS 18,20]
Answer:
One of the major discovery of C.V. Raman is Raman effect. It deals with scattering of light by molecules of a medium when they are excited to vibrational energy levels.

Question 3.
What are the fundamental forces in nature? [AP 19; TS 18,19,22][Imp.Q]
(or)
Arrange the fundamental forces in descending order according to relative strength.
Answer:
Four fundamental forces in nature:

1. Strong nuclear forces(F_s)
2. Electro Magnetic forces(F_e)
3. Weak Nuclear forces(F_w)
4. Gravitational force (F_g)

Descending order of forces according to relative strength: F_s : F_e : F_w : F_g = 10₃₉ : 10₃₇ : 10₂₆ : 1

Question 4.
Which of the following has symmetry?
(a) acceleration due to gravity
(b) law of gravitation
Answer:
Law of gravitation, because it holds good everywhere in the universe.

Question 5.
What is the contribution of S. Chandra Sekhar to physics? [AP, TS 15, 16, 17, 19]
Answer:
Chandra Sekhar limit, structure and evolution of stars.

Additional Very Short Answer Questions

Question 6.
What are the discoveries of Albert Einstein?
Answer:
The main discoveries of Albert Einstein are
1) Explanation to Photo electric effect
2) Theory of Brownian motion
3) Theory of relativity
4) Mass energy equivalence relation i.e, E = mc².

Question 7.
Which year is. declared as International year of physics?
Answer:
2005 was declared as International year of physics, in recognition of Einstein’s monumental contribution to physics.

Question 8.
What are the fundamental laws of physics?
Answer:
Conservation of energy, momentum, angular momentum, charge etc., are considered to be fundamental laws in physics.

Question 9.
What are the contributions of S.Bose to physics?
Answer:
Bose gave a new derivation of Planck’s law, treating radiation as a gas of photons. He employed new statistical methods of counting photon states.

Question 10.
What is beta (β) decay? Which force is a function of it? [TS 16]
Answer:
The nucleus emits an electron and an uncharged particle called neutrino. This process is called beta (P) decay. Weak Nuclear force is a function of it.