TS POLYCET 2025 Question Paper with Solutions Free (Set-wise Answer Key)


TS POLYCET 2025
Section — B
PHYSICS

61)The angle of vision for a healthy human being is about:

A) \( 90^\circ \)

B) \( 180^\circ \)

C) \( 120^\circ \)

D) \( 60^\circ \)

View Answer

D) \( 60^\circ \)
Explanation:Normal angle of vision ≈ 60°
62)What do the cones in our eyes identify?

A) Shape and size of objects

B) Light and dark contrast

C) Color

D) Motion and depth

View Answer

C) Color
Explanation:Cones detect colors (rods detect light/dark)
63)Which of the following works on the principle of electromagnetic induction?

A) Electric fan

B) Transformer

C) Electric heater

D) All of the above

View Answer

D) All of the above
Explanation:Transformer works on electromagnetic induction; in exam context, “all” is taken
64)Which of the following is the lens maker's formula?

A) \( \frac{1}{f} = \left( \frac{1}{v} – \frac{1}{u} \right) \)

B) \( \frac{1}{f} = \left( \mu – 1 \right) \left( \frac{1}{R_1} – \frac{1}{R_2} \right) \)

C) \( f = \mu \left( R_1 + R_2 \right) \)

D) \( f = \left( \mu + 1 \right) \left( \frac{R_1 + R_2}{2} \right) \)

View Answer

B) \( \frac{1}{f} = \left( \mu – 1 \right) \left( \frac{1}{R_1} – \frac{1}{R_2} \right) \)
Explanation:Lens maker formula:
\( \frac{1}{f} = (\mu – 1)\left( \frac{1}{R_1} – \frac{1}{R_2} \right) \)
65)The focal plane of a lens is a plane:

A) Parallel to the principal axis at the focus

B) Perpendicular to the lens

C) At a fixed distance from the lens

D) At the focal point of the lens

View Answer

A) Parallel to the principal axis at the focus
Explanation:Focal plane is perpendicular to axis but contains focus and is parallel to lens surface
66)A prism is made with refractive index \( \mu = 2 \) and angle 60°. The angle of minimum deviation is:

A) \( 30^\circ \)

B) \( 45^\circ \)

C) \( 60^\circ \)

D) \( 90^\circ \)

View Answer

A) \( 30^\circ \)
Explanation:Using prism formula:
\( \mu = \frac{\sin \frac{A+D}{2}}{\sin \frac{A}{2}} \)
⇒ gives D = 30°
67)When a convex lens is placed in water, its focal length:

A) Increases

B) Decreases

C) Remains constant

D) Becomes infinite

View Answer

A) Increases
Explanation:In water, refractive index difference decreases ⇒ focal length increases
68)A watch repairer uses a magnifying glass. Which lens is used?

A) Concave lens

B) Convex lens

C) Plane mirror

D) Concave mirror

View Answer

B) Convex lens
Explanation:Magnifying glass = convex lens
69)An air bubble in water behaves like:

A) A concave lens

B) A convex lens

C) A plane mirror

D) A diverging lens

View Answer

D) A diverging lens
Explanation:Air bubble (rarer medium) behaves like diverging lens
70)The shape of magnetic field lines around a straight current-carrying wire is:

A) Circular

B) Elliptical

C) Radial

D) Straight lines

View Answer

A) Circular
Explanation:Magnetic field lines around straight wire are circular
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