Physics - Study Mode

[#426] How many laws of physics are there?
Correct Answer

(B) 4

Explanation

Solution: Physics is a complex science with several fundamental principles and laws that govern the behavior of the physical world. While there are numerous principles and equations in physics, there are four fundamental laws, also known as the "Four Fundamental Forces of Nature," that are considered the cornerstone of classical physics. These are: 1. Newton's First Law of Motion : The law of inertia. 2. Newton's Second Law of Motion : F = ma. 3. Newton's Third Law of Motion : Action and reaction are equal and opposite. 4. Law of Universal Gravitation : The force of attraction between two masses. These laws are essential for understanding classical mechanics and are often referred to as the "laws of physics." So, the correct answer is Option B: 4 , representing the four fundamental laws of physics.

[#427] Which physicists is the writer of the book 'A Brief History of Time'?
Correct Answer

(D) Stephen Hawking

Explanation

Solution: Stephen Hawking is the writer of the book 'A Brief History of Time'.

[#428] On which day 'National Science Day' is celebrated in India ?
Correct Answer

(D) February 28

Explanation

Solution: 'National Science Day' is celebrated in India on February 28.

[#429] The phenomenon of change in direction of light when it passes from one medium to another is called
Correct Answer

(C) Refraction

Explanation

Solution: The phenomenon of change in direction of light when it passes from one medium to another is called refraction.

[#430] The refractive index of a transparent medium is maximum for
Correct Answer

(B) Violet light

Explanation

Solution: The refractive index of a transparent medium is most for violet light. The reason is that the speed of violet light is least in a transparent medium while the speed of red light is most in transparent medium.