TS Polycet (Polytechnic) 2021 Previous Question Paper with Answers And Model Papers With Complete Analysis

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TS POLYCET
Section — B
PHYSICS

Polycet Mock Test

61) To find normal to curved surface at a point, join that point and

A) Focus (F)
B) Pole (P)
C) Centre of curvature C.
D) Any point on principal axis

View Answer
C) Centre of curvature C.

Explanation:Normal to a curved surface at a point is drawn by joining that point to the centre of curvature (C) .

62) When a set of parallel rays of light inclined at 15° to the principal axis, are incident on a convex lens, they

A) Converge at focus (F)
B) Diverge from focus (F)
C) Converge to a point on focal plane
D) Diverge from a point on focal plane

View Answer
C) Converge to a point on focal plane

Explanation:Parallel rays inclined at 15° converge to a point on the focal plane, not directly at F.
Answer: Converge to a point on focal plane

63) Focal plane of a spherical mirror is

A) Line joining pole (P) and focus (F) of the mirror
B) Plane perpendicular to the principal axis at focus (F)
C) Plane perpendicular at centre of curvature C.
D) Plane parallel to the principal axis

View Answer
B) Plane perpendicular to the principal axis at focus (F)

Explanation:Focal plane is perpendicular to the principal axis at the focus.
Answer: Plane perpendicular to the principal axis at focus (F)

64) Dentist uses this mirror to examine teeth of patients

A) Concave mirror
B) Convex mirror
C) Plane mirror
D) None of the above

View Answer
A) Concave mirror

Explanation:Dentists use concave mirrorsto get a magnified, erect image.
Answer: Concave mirror

65) If object and image lie on the same side of a mirror, the mirror is

A) Concave
B) Convex
C) Plane
D) None of the above

View Answer
A) Concave

Explanation:If both object and image are on same side, it must be a concave mirrorforming a real or magnified virtual image.
Answer: Concave

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