MCQ for Physics (Optics)
Q1) Calculate the velocity of the light ray in the medium, if the critical angle for TIR from medium tothe vacuum is 30°.
(a) 2 x 108 m/s
(b) 1.5 x 108 m/s
(c) 0.75 x 108 m/s
(d) 3 x 108 m/s
Answer: (b) 1.5 x 108 m/s
Q2) Which of the following is the combination that is used in the formation of achromatic lenses?
(a) 1 convex and 1 plane mirror
(b) 2 convex lenses
(c) 1 convex and 1 concave lens
(d) 2 concave lenses
Answer: (c) 1 convex and 1 concave lens
Q3) How does magnifying power change for an objective lens if the focal length of the objective lens is
increased?
(a) The microscope will decrease but for the telescope, it will increase
(b) The microscope will increase but for the telescope, it decreases
(c) The microscope and telescope will increase
(d) The microscope and telescope will decrease
Answer: (a) The microscope will decrease but for the telescope, it will increase
Q4) What is the power of the combination of lenses, if two thin lenses of focal length f1 and f2 are in
contact and coaxial.
(a) f1−f2f1f2
(b) f2f1
(c) f1f2−−√
(d) f1+f2f1f2
Answer: (d) f1+f2f1f2
Q5) What is the magnification produced by the plane mirror?
(a) Zero
(b) +1
(c) -1
(d) Between 0 and +∞
Answer: (b) +1
Q6) The image formed by the convex mirror is 1n times the object and has a focal length f. What is
the distance of object from the mirror?
(a) (n + 1)
(b) (n – 1)f
(c) (n+1n)f
(d) (n−1n)f
Answer: (b) (n – 1)f
Q7) Calculate the speed of light in water if the refractive index of water is 1.33
(a) 4 x 108 m/s
(b) 2.25 x 108 m/s
(c) 1.33 x 108 m/s
(d) 3 x 108 m/s
Answer: (b) 2.25 x 108 m/s
Q8) What is hypermetropia?
(a) Bad vision due to age
(b) Short-sightedness
(c) Long-sightedness
(d) Formation of a layer on the eye
Answer: (c) Long-sightedness
Q9) Rainbow is an example of which phenomenon?
(a) Refraction and scattering
(b) Refraction and total internal reflection
(c) Dispersion and reflection
(d) Dispersion and total internal reflection
Answer: (d) Dispersion and total internal reflection
Q10) Consider copper and aluminum wire whose length and resistance are the same. Also, the specific
resistance of aluminium is more than copper. Select the correct statement
(a) Copper and aluminium mass are the same
(b) Copper wire has more mass than the aluminium wire
(c) Copper wire has less mass than the aluminium wire
(d) The information given is incomplete
Answer: (d) The information given is incomplete
