Light
15 solved questions from Class 7 Science, each with the full working. Tap any question to see the step-by-step solution.
- 1 What is the fundamental scientific concept introduced in the chapter 'Light'? medium MCQ Key Concept & Definition
- 2 Which of the following is an important application or observation related to 'Light'? easy MCQ Practical Application
- 3 What primary question does the chapter 'Light' aim to answer? medium MCQ Core Scientific Inquiry
- 4 Why is the study of 'Light' essential for students in class-7? hard MCQ Importance & Significance
- 5 Which key practice is recommended while studying topics in 'Light'? medium MCQ Scientific Method
- 6 What is the primary topic or theoretical principle explored in 'Light' (Class 7 SCIENCE)? medium MCQ Chapter Core Principle
- 7 Which key mechanism or analytical rule is highlighted in 'Light'? medium MCQ Key Analytical Mechanism
- 8 Which material gives the most perfect reflection of light? easy MCQ 1 mark Reflection of light by smooth surfaces
- 9 A laser beam has a wavelength of 500 nm in vacuum. It enters a glass slab with refractive index 1.5. Find its wavelength inside the glass. hard 3 marks Wavelength change in different media
- 10 A light ray travels from air into water. The speed of light in air is 3.00×10^8 m/s and in water it is 2.25×10^8 m/s. Find the refractive index of water. medium 2 marks Refractive index calculation
- 11 A laser beam with wavelength 550 nm in air strikes a glass slab of refractive index 1.50. What is the wavelength of the light inside the glass? medium 3 marks Wavelength reduction in denser medium
- 12 A light ray strikes a perfectly polished metal plate at an angle of 35^circ to the normal. Determine the angle of reflection and explain why the reflected ray does not change direction if the plate is roughened, and what effect roughness would have on the reflected light. hard 5 marks Law of reflection and surface roughness
- 13 A green light of wavelength 530 nm in air enters a glass slab with refractive index 1.55. Find the wavelength inside the glass and the speed of light inside the glass. hard 4 marks Wavelength change and speed in different media
- 14 A light ray strikes a polished metal plate at an angle of 50^circ to the normal. What is the angle of reflection? easy MCQ 1 mark Law of reflection
- 15 Explain how a prism separates white light into its constituent colors, mentioning the role of refractive index. medium 2 marks Dispersion of light in prisms