## Nature of light and interference of light- MCQ-Basic

Physics is an important subject in preparation for various Competitive exams. To keep a track of your preparation we have designed a small quiz of 10 Basic Level Questions on Nature of light and interference of light.You have 10 minutes to solve the quiz, click the start timer button in order to start the timer and then click on submit button at the end to submit the quiz and view your scores and correct answers.

Q1. The dual nature of light is exhibited by

•  Diffraction and photoelectric effect
•  Diffraction and reflection
•  Refraction and interference
•  Photoelectric effect

Diffraction and photoelectric effect

Q2. Huygen wave theory allows us to know

•  The wavelength of the wave
•  The velocity of the wave
•  The amplitude of the wave
•  The propagation of wave fronts

The propagation of wave fronts

Q3. When a beam of light is used to determine the position of an object, the maximum accuracy is achieved if the light is

•  Polarised
•  Of longer wavelength
•  Of shorter wavelength
•  Of high intensity

Of shorter wavelength

Q4. Which of the following phenomenon does not show the wave nature of light

•  Diffraction
•  Interference
•  Refraction
•  Photoelectric effect

Photoelectric effect

Q5. As a result of interference of two coherent sources of light, energy is

•  Increased
•  Redistributed and the distribution does not vary with time
•  Decreased
•  Redistributed and the distribution changes with time

Redistributed and the distribution does not vary with time

Q6. To demonstrate the phenomenon of interference, we require two sources which emit radiation

•  Of the same frequency and having a definite phase relationship
•  Of nearly the same frequency
•  Of the same frequency
•  Of different wavelengths

Of the same frequency and having a definite phase relationship

Q7. Consider the following statements Assertion (A): Thin films such as soap bubble or a thin layer of oil on water show beautiful colours, when illuminated by white light. Reason (R) : It happens due to the interference of light reflected from the upper surface of the thin film. Of these statements

•  Both A and R are true but R is a correct explanation of A
•  Both A and R are true but R is not a correct explanation of A
•  A is true but R is false
•  A is false but R is true

A is true but R is false

Q8. When light passes from one medium into another medium, then the physical property which does not change is

•  Velocity
•  Wavelength
•  Frequency
•  Refractive index

Frequency

Q9. Two coherent sources of different intensities send waves which interfere. The ratio of maximum intensity to the minimum intensity is 25. The intensities of the sources are in the ratio

•  25 : 1
•  5 : 1
•  9 : 4
•  25 : 16

5 : 1

Q10. Laser beams are used to measure long distance because

•  They are monochromatic
•  They are highly polarised
•  They are coherent
•  They have high degree of parallelism

They have high degree of parallelism

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