Multiple Choice Questions on Light and Optics
Question 1:
Which of the following is not considered matter?
- A) Light
- B) Water
- C) Air
- D) Rock
Question 2:
Light is a form of energy made up of:
- A) Atoms
- B) Electrons
- C) Molecules
- D) Photons
Question 3:
Which of the following is a man-made source of light?
- A) The sun
- B) Fireflies
- C) Glow worms
- D) Electric bulbs
Question 4:
Which of the following is a natural source of light?
- A) Candle
- B) Laser
- C) Fireflies
- D) Electric bulbs
Question 5:
An object that does not allow any light to pass through is called:
- A) Transparent
- B) Translucent
- C) Opaque
- D) Luminous
Question 6:
Which of the following objects is an example of a translucent material?
- A) Glass
- B) Water
- C) Butter paper
- D) Mirror
Question 7:
Which of the following objects is an example of a transparent material?
- A) Note book
- B) Human body
- C) Glass
- D) Wood
Question 8:
The phenomenon where light travels in a straight line is called:
- A) Reflection
- B) Refraction
- C) Rectilinear propagation
- D) Diffusion
Question 9:
The darker region of a shadow where no light reaches is called:
- A) Penumbra
- B) Umbra
- C) Eclipse
- D) Reflection
Question 10:
Which of the following statements about bioluminescence is true?
- A) It is the emission of light by hot sources
- B) It is the emission of light by living organisms
- C) It requires very high temperatures
- D) It is a form of incandescence
Question 11:
A material that allows almost all the light falling on it to pass through is:
- A) Opaque
- B) Translucent
- C) Transparent
- D) Reflective
Question 12:
Which object is not a luminous object?
- A) The sun
- B) A candle
- C) The moon
- D) An electric bulb
Question 13:
Which type of object allows only some of the light falling on it to pass through?
- A) Transparent
- B) Translucent
- C) Opaque
- D) Reflective
Question 14:
Which type of object completely reflects light?
- A) Transparent
- B) Translucent
- C) Opaque
- D) Luminous
Question 15:
What is required for the formation of a shadow?
- A) A source of light
- B) An opaque object
- C) A screen or surface behind the object
- D) All of the above
Question 16:
Which statement is true about the length of shadows during the day?
- A) Shadows are longest at noon
- B) Shadows are shortest in the morning
- C) Shadows are longest in the morning and shortest at noon
- D) Shadows remain the same length throughout the day
Question 17:
Which of the following is a characteristic of a shadow?
- A) It is uniformly dark
- B) It is sharp at the edges
- C) It is of the same shape as the object
- D) All of the above
Question 18:
Which region of the shadow is partially dark?
- A) Umbra
- B) Penumbra
- C) Eclipse
- D) Reflection
Question 19:
What type of source is a tube light?
- A) A hot source of light
- B) A cold source of light
- C) An incandescent body
- D) A luminous object
Question 20:
What happens when the tube light is switched on?
- A) The filament gets heated and starts glowing
- B) Electrons collide with mercury atoms to produce ultraviolet rays
- C) The fluorescent material absorbs ultraviolet rays and emits visible light
- D) All of the above