# Is light visible or invisible?

Light is invisible until it hits an object. It can only be visible to us whenever it get scattered or bounced off the dust particles in the intervening medium. We can see the source of light like stars at night as they are too dim to light up much but that light does hit our eyes and therefore we see the light. The above discussion on visibility of light is only confined to the electromagnetic radiation of wavelength from 400 nm to 700 nm which is called visible light, as these electromagnetic radiations gives the sensation of sight.

• ## Assertion and Reason Questions for Class 9 Maths Chapter 4 Linear Equations in Two Variables

September 17, 2021

Assertion and Reason Questions for Class 9 Maths Chapter 4 Linear Equations in Two Variables Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion… Read more

• ## Assertion and Reason Questions for Class 9 Maths Chapter 6 Lines and Angles

September 17, 2021

Assertion and Reason Questions for Class 9 Maths Chapter 6 Lines and Angles Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).(b) Both assertion… Read more

• ## Assertion and Reason Questions for Class 9 Maths Chapter 3 Coordinate Geometry

September 16, 2021

Assertion and Reason Questions for Class 9 Maths Chapter 3 Coordinate Geometry Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).(b) Both assertion… Read more

• ## Case Study Based Questions for Class 10 Maths Chapter 2 Polynomials

September 16, 2021

Case Study Questions for Class 10 Maths Chapter 1 Real Numbers Question 1: Priya and her husband Aman who is an architect by profession, visited France. They went to see Mont Blanc Tunnel which is a highway tunnel between France and Italy, under the Mont Blanc Mountain in the Alps, andhas a parabolic cross-section. The… Read more

• ## Assertion and Reason Questions for Class 12 Physics Chapter 7 Alternating Current

September 13, 2021

Directions: Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.(a) Assertion is correct, reason is correct; reason is a correct explanation for… Read more

• ## MCQ Questions for Class 12 Maths Chapter 1 Relations and Functions

September 13, 2021

Q.1. Let P = {(x, y) : x2+y2=1, x, y ∈ R}. Then, P is (a) Reflexive (b) Symmetric (c) Transitive (d) Anti-symmetric Answer Answer: (b) Q.2. Let S be the set of all real numbers. Then, the relation R = {(a, b) : 1 +ab > 0} on S is (a) Reflexive and symmetric… Read more

• ## Assertion and Reason Questions for Class 9 Science Chapter 12 Sound

September 10, 2021

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).(b) Both assertion (A) and reason (R) are true but reason (R) is not the… Read more

• ## Assertion and Reason Questions for Class 9 Science Chapter 11 Work and Energy

September 10, 2021

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).(b) Both assertion (A) and reason (R) are true but reason (R) is not the… Read more

• ## Assertion and Reason Questions for Class 9 Science Chapter 10 Gravitation

September 9, 2021

Directions: In each of the following questions, a statement of Assertion is given and a corresponding statement of Reason is given just below it. Of the statements, given below, mark the correct answer as:(a) Both assertion and reason are true and reason is the correct explanation of assertion.(b) Both assertion and reason are true but… Read more

• ## MCQ Questions for Class 10 Maths with Answers Chapter 12 Areas Related to Circles

September 8, 2021

Q.1. If the perimeter and the area of a circle are numerically equal, then the radius of the circle is(A) 3 units(B) 4 units(C) π units(D) 2 units Answer Answer: (D) 2 units Q.2. A pendulum swings through on angle of 30∘ and describes an arc 8.8 cm in length. Find the length of pendulum… Read more

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