Exam Light

ONLINE EXAM

Q1. What is light? A. A form of energy B. A material substance C. A gas D. A liquid Answer: A Q2. Light helps us to A. Hear sounds B. See objects C. Taste food D. Feel heat Answer: B Q3. The speed of light in vacuum is approximately A. 3 × 10⁶ m/s B. 3 × 10⁸ m/s C. 3 × 10⁴ m/s D. 3 × 10¹⁰ m/s Answer: B Q4. Which of the following is a source of light? A. Moon B. Mirror C. Sun D. Table Answer: C Q5. Objects that emit their own light are called A. Transparent objects B. Non-luminous objects C. Luminous objects D. Opaque objects Answer: C Q6. The moon is an example of A. Luminous object B. Non-luminous object C. Transparent object D. Translucent object Answer: B Q7. Light travels in A. Curved path B. Zig-zag path C. Straight line D. Circular path Answer: C Q8. The straight-line path of light is called A. Beam B. Ray C. Wave D. Particle Answer: B Q9. The bouncing back of light from a surface is called A. Refraction B. Dispersion C. Reflection D. Absorption Answer: C Q10. A smooth and shiny surface reflects light regularly. This is called A. Diffused reflection B. Irregular reflection C. Regular reflection D. Scattering Answer: C Q11. Which surface gives regular reflection? A. Rough wall B. Paper C. Mirror D. Cloth Answer: C Q12. The angle of incidence is equal to A. Angle of refraction B. Angle of deviation C. Angle of reflection D. Angle of dispersion Answer: C Q13. The angle between the incident ray and the normal is called A. Angle of reflection B. Angle of incidence C. Angle of deviation D. Angle of emergence Answer: B Q14. A plane mirror forms an image that is A. Real and inverted B. Virtual and erect C. Real and erect D. Virtual and inverted Answer: B Q15. The image formed by a plane mirror is A. Smaller than object B. Larger than object C. Same size as object D. Depends on distance Answer: C Q16. The distance of the image behind a plane mirror is A. Less than object distance B. More than object distance C. Equal to object distance D. Zero Answer: C Q17. Which mirror is used as a looking mirror? A. Concave mirror B. Convex mirror C. Plane mirror D. Cylindrical mirror Answer: C Q18. Which mirror always forms a virtual and diminished image? A. Plane mirror B. Concave mirror C. Convex mirror D. Parabolic mirror Answer: C Q19. Convex mirrors are commonly used as A. Shaving mirrors B. Dentist mirrors C. Rear-view mirrors D. Telescope mirrors Answer: C Q20. Which mirror can form a real image? A. Plane mirror B. Convex mirror C. Concave mirror D. None of these Answer: C Q21. The point where parallel rays meet after reflection is called A. Centre of curvature B. Pole C. Focus D. Radius Answer: C Q22. The distance between the pole and focus of a mirror is called A. Radius of curvature B. Focal length C. Diameter D. Height Answer: B Q23. A concave mirror is also called A. Diverging mirror B. Plane mirror C. Converging mirror D. Cylindrical mirror Answer: C Q24. Which mirror is used in solar cookers? A. Plane mirror B. Convex mirror C. Concave mirror D. Glass mirror Answer: C Q25. The centre of the reflecting surface of a mirror is called A. Focus B. Centre of curvature C. Pole D. Radius Answer: C Q26. A transparent object allows A. No light to pass B. Some light to pass C. All light to pass D. Only reflected light Answer: C Q27. A translucent object allows A. All light to pass B. No light to pass C. Some light to pass D. Reflected light only Answer: C Q28. An opaque object A. Transmits all light B. Transmits some light C. Does not transmit light D. Emits light Answer: C Q29. The phenomenon of bending of light when it passes from one medium to another is called A. Reflection B. Dispersion C. Refraction D. Scattering Answer: C Q30. Light bends towards the normal when it enters A. Rarer medium B. Same medium C. Denser medium D. Vacuum Answer: C Q31. The splitting of white light into different colours is called A. Reflection B. Refraction C. Dispersion D. Scattering Answer: C Q32. A prism is used to show A. Reflection of light B. Dispersion of light C. Absorption of light D. Transmission of light Answer: B Q33. The band of seven colours formed by white light is called A. Image B. Spectrum C. Beam D. Ray Answer: B Q34. Which colour deviates the most in a prism? A. Red B. Yellow C. Green D. Violet Answer: D Q35. Which colour deviates the least in a prism? A. Violet B. Blue C. Green D. Red Answer: D Q36. The natural spectrum seen in the sky after rain is called A. Halo B. Mirage C. Rainbow D. Shadow Answer: C Q37. A shadow is formed when A. Light is reflected B. Light is refracted C. Light is blocked D. Light is dispersed Answer: C Q38. Which type of object forms a dark shadow? A. Transparent B. Translucent C. Opaque D. Luminous Answer: C Q39. The shadow of an object is always A. Coloured B. Dark C. Bright D. Transparent Answer: B Q40. Which of the following does not produce a shadow? A. Book B. Tree C. Glass D. Wall Answer: C Q41. Light does not require a medium to travel. This means light can travel through A. Water only B. Air only C. Glass only D. Vacuum Answer: D Q42. Which instrument uses mirrors to see distant objects? A. Microscope B. Periscope C. Barometer D. Thermometer Answer: B Q43. A real image can be obtained on A. Mirror only B. Screen only C. Retina only D. Screen or retina Answer: D Q44. A virtual image cannot be obtained on A. Mirror B. Lens C. Screen D. Eye Answer: C Q45. Which mirror is used by dentists to see enlarged images? A. Plane mirror B. Convex mirror C. Concave mirror D. Cylindrical mirror Answer: C Q46. The normal at the point of incidence is A. Parallel to surface B. Perpendicular to surface C. Inclined to surface D. Tangential to surface Answer: B Q47. The line along which light travels is called A. Beam B. Ray C. Spectrum D. Focus Answer: B Q48. A group of parallel rays of light is called A. Spectrum B. Image C. Beam D. Focus Answer: C Q49. The mirror used in street-light reflectors is A. Plane mirror B. Convex mirror C. Concave mirror D. Glass mirror Answer: C Q50. Which phenomenon explains the working of mirrors? A. Refraction B. Dispersion C. Reflection D. Scattering Answer: C SUBMIT EXAM