Q1. Which part of the human eye controls the amount of light entering the eye?A Pupil B Retina C Cornea D Iris View full solution →
Q2. Why is red light scattered the least compared to other colours in the visible spectrum?A It has the longest wavelength. B Its frequency is the highest. C It travels fastest in vacuum. D It has the shortest wavelength. View full solution →
Q3. A person uses a convex lens of focal length 25 cm to read a book. What is the power of this lens?A +4.0 D B -0.04 D C +0.04 D D -4.0 D View full solution →
Q4. Assertion (A): The Sun appears elliptical at sunrise and sunset. Reason (R): Atmospheric refraction causes the Sun's apparent vertical diameter to decrease more than its horizontal diameter, leading to an elliptical appearance.A Both A and R are true but R is not the correct explanation of A. B A is false but R is true. C A is true but R is false. D Both A and R are true and R is the correct explanation of A. View full solution →
Q5. If the Earth had no atmosphere, what would be the colour of the sky during the day?A Blue B Red C White D Black/Dark View full solution →
Q6. Assertion (A): Red colour is used as a danger signal. Reason (R): Red light has the longest wavelength and is scattered the least by smoke or fog.A A is true but R is false. B A is false but R is true. C Both A and R are true but R is not the correct explanation of A. D Both A and R are true and R is the correct explanation of A. View full solution →