Chapter 6: Geometrical Optics Physics Mcqs for High School - Grade 10 - Set 5

1)   In the human eye, pictures are recorded by

a. cornea
b. pupil
c. retina
d. iris
Answer  Explanation 

ANSWER: retina

Explanation:
No explanation is available for this question!


2)   An object 4 cm high is placed at a distance of 12 cm from a concave lens, If the focal length is 8 cm then the position of the object is

a. 20 cm
b. 25 cm
c. 24 cm
d. 22 cm
Answer  Explanation 

ANSWER: 24 cm

Explanation:
No explanation is available for this question!


3)   A spherical mirror whose outer curved surface is reflecting is called

a. convex mirror
b. concave mirror
c. lens
d. plane mirror
Answer  Explanation 

ANSWER: convex mirror

Explanation:
No explanation is available for this question!


4)   The center of a sphere of the spherical mirror is called

a. radius of curvature
b. pole
c. center of curvature
d. focal length
Answer  Explanation 

ANSWER: center of curvature

Explanation:
No explanation is available for this question!


5)   The lens which is thick at the center but thin at the edges is called

a. counter lens
b. fiber lens
c. convex lens
d. concave lens
Answer  Explanation 

ANSWER: convex lens

Explanation:
No explanation is available for this question!


6)   The radius of the sphere of which spherical mirror is a part is known as

a. radius of curvature
b. pole
c. center of curvature
d. focal length
Answer  Explanation 

ANSWER: radius of curvature

Explanation:
No explanation is available for this question!


7)   The incident ray, the normal and the refracted ray at the point of incidence all lie in the same plane. This is the law of

a. reflection
b. refraction
c. defraction
d. acoustics
Answer  Explanation 

ANSWER: refraction

Explanation:
No explanation is available for this question!


8)   As the focal length of a convex lens is positive, therefore its power should be

a. always zero
b. also positive
c. negative
d. none of above
Answer  Explanation 

ANSWER: also positive

Explanation:
No explanation is available for this question!


9)   A lens which converges the incident rays on a single point is

a. convex lens
b. concave lens
c. biconcave lens
d. bioconvex lens
Answer  Explanation 

ANSWER: convex lens

Explanation:
No explanation is available for this question!


10)   The condition in which the image is formed behind the retina is called

a. Farsightedness
b. Nearsightedness
c. image defect
d. blind spotting
Answer  Explanation 

ANSWER: Farsightedness

Explanation:
No explanation is available for this question!


11)   The short-sightedness can be corrected if

a. converging glasses are used
b. converging mirror is used
c. diverging mirror is used
d. diverging glasses is used
Answer  Explanation 

ANSWER: diverging glasses is used

Explanation:
No explanation is available for this question!


12)   The endoscope used to examine the stomach is called

a. cystoscope
b. gastroscope
c. microscope
d. bronchoscope
Answer  Explanation 

ANSWER: gastroscope

Explanation:
No explanation is available for this question!


13)   An object 20 cm tall is located 14 cm from a concave mirror having focal length 20 cm. The image is located at

a. 30 cm
b. 46.7 cm
c. 35.6 cm
d. 32.5 cm
Answer  Explanation 

ANSWER: 46.7 cm

Explanation:
No explanation is available for this question!


14)   The distance from the pole to the principal focus measured along the

a. center of curvature
b. principal axis
c. vertex
d. radius of curvature
Answer  Explanation 

ANSWER: principal axis

Explanation:
No explanation is available for this question!


15)   In the fiber-optic thread, the refractive index of the inner core is

a. less than cladding
b. equal to cladding
c. higher than cladding
d. all of above
Answer  Explanation 

ANSWER: higher than cladding

Explanation:
No explanation is available for this question!


16)   The line joining the center of curvature and pole of the spherical mirror is known as

a. center of curvature
b. focal length
c. principal axis
d. vertex
Answer  Explanation 

ANSWER: principal axis

Explanation:
No explanation is available for this question!


17)   Some people can not see distant objects clearly without spectacles. This defect is called

a. accommodation
b. stress
c. farsightedness
d. nearsightedness
Answer  Explanation 

ANSWER: nearsightedness

Explanation:
No explanation is available for this question!


18)   The focal length is positive for

a. diverging lens
b. converging lens
c. biconcave lens
d. convex lens
Answer  Explanation 

ANSWER: converging lens

Explanation:
No explanation is available for this question!


19)   The refractive index of a medium is

a. Speed of light in air to speed of light in vacuum
b. Speed of light in vacuum to speed of light in air
c. focal length to object distance
d. speed of light in the medium x speed of light in the air
Answer  Explanation 

ANSWER: Speed of light in air to speed of light in vacuum

Explanation:
No explanation is available for this question!


20)   Only virtual and erect images can be formed by a

a. convex mirror
b. concave mirror
c. silver mirror
d. plane mirror
Answer  Explanation 

ANSWER: convex mirror

Explanation:
No explanation is available for this question!