AP POLYCET 2026 Set A Question Paper with Solutions & Official Key | Free Online Practice Questions

31) The circumference of two circles are in the ratio 2 : 3, the ratio of their surface area is
రెండు వృత్తముల చుట్టుకొలతల నిష్పత్తి 2 : 3 అయిన వాటి వైశాల్యముల నిష్పత్తి?

A) 9 : 4

B) 4 : 9

C) 2 : 3

D) 3 : 2

View Answer

B) 4 : 9
Explanation:Circumference of circle:
C = 2πr
If circumferences ratio is 2 : 3
Then radii ratio is also:
2 : 3
Area of circles is proportional to square of radius.
Therefore:
Area ratio
= 2² : 3²
= 4 : 9
Answer: 4 : 9
32) A playing toy is in the shape of a cone surmounted by a hemisphere such that their bases coincide. The diameter of the hemisphere is 7 cm and the slant height of the cone is 4 cm. What is the total surface area of the toy? (π = \( \frac{22}{7} \))
ఒక ఆట వస్తువు పైభాగం అర్థగోళంతో కప్పబడిన శంకువు ఆకారంలో ఉంది. రెండింటి భూములు సమానం. అర్థగోళపు వ్యాసం 7 సెం.మీ. మరియు శంకువు ఏటవాలు ఎత్తు 4 సెం.మీ. అయినచో, ఆ వస్తువు మొత్తం ఉపరితల వైశాల్యం? (π = \( \frac{22}{7} \))

A) 12 cm²

B) 121 cm²

C) 120 cm²

D) 20 cm²

View Answer

B) 121 cm²
Explanation:Diameter of hemisphere = 7 cm
Radius:
r = 7/2 = 3.5 cm
Slant height of cone:
l = 4 cm
Total surface area:
= Curved surface area of cone + Curved surface area of hemisphere
= πrl + 2πr²
= (22/7)(3.5)(4) + 2(22/7)(3.5)²
= 44 + 77
= 121 cm²
Answer: 121 cm²
33) The ratio of volumes of a cone, a cylinder and a hemisphere having same base, radius and equal heights is
సమాన మైన భూ వ్యాసార్థము, ఎత్తు ను కలిగి ఉన్న శంకువు, స్థూపము మరియు అర్థగోళముల యొక్క ఘనపరిమాణముల నిష్పత్తి?

A) 1 : 3 : 2

B) 2 : 1 : 7

C) 1 : 2 : 3

D) 3 : 1 : 2

View Answer

A) 1 : 3 : 2
Explanation:Let common radius = r
Equal height = r
Volume of cone:
= (1/3)πr²h
= (1/3)πr³
Volume of cylinder:
= πr²h
= πr³
Volume of hemisphere:
= (2/3)πr³
Ratio:
1/3 : 1 : 2/3
Multiply by 3:
1 : 3 : 2
Answer: 1 : 3 : 2
34) If a solid sphere with total surface area 48 cm² is bisected into two hemispheres, then the total surface area of any one of the hemispheres is ____ cm².
ఒక గోళము యొక్క మొత్తం ఉపరితల వైశాల్యము 48 చ. సెం.మీ ఆ గోళమును రెండు సామాన్య అర్థ గోళములుగా విభజించిన, ఆ అర్థ గోళములలో ఒక దాని ఉపరితల వైశాల్యము ____ చ. సెం. మీ.

A) 48

B) 60

C) 24

D) 36

View Answer

D) 36
Explanation:Total surface area of sphere:
4πr² = 48
πr² = 12
Total surface area of hemisphere:
= 3πr²
= 3 × 12
= 36 cm²
Answer: 36 cm²
35) If cosecθ = 2 and cotθ = √3a, then the value of a is
cosecθ = 2 మరియు cotθ = √3a, అయిన a విలువ

A) 0

B) 2

C) 1

D) √3

View Answer

C) 1
Explanation:Given:
cosecθ = 2
Using identity:
cosec²θ = 1 + cot²θ
4 = 1 + cot²θ
cot²θ = 3
cotθ = √3
Given:
cotθ = √3 a
So:
√3 a = √3
a = 1
Answer: 1
36) cos(A – B) = 1/2 and sin B = 1/√2, then A = ?
cos(A – B) = 1/2 మరియు sin B = 1/√2, అయినచో A =

A) 15°

B) 105°

C) 90°

D) 60°

View Answer

B) 105°
Explanation:sinB = 1/√2
Therefore:
B = 45°
Given:
cos(A – B) = 1/2
A – B = 60°
A = 60° + 45°
= 105°
Answer: 105°
37) If cosθ = \( \frac{\sqrt{b² – a²}}{b} \), then sinθ = ?
cosθ = \( \frac{\sqrt{b² – a²}}{b} \), అయినచో sinθ = ?

A) \( \frac{\sqrt{a² – b²}}{b} \)

B) \( \frac{\sqrt{b² – a²}}{a} \)

C) b/a

D) a/b

View Answer

D) a/b
Explanation:Given:
cosθ = √(b² – a²) / b
Using identity:
sin²θ = 1 – cos²θ
sin²θ = 1 – (b² – a²)/b²
= a²/b²
sinθ = a/b
Answer: a/b
38) If cosecθ + cotθ = k, then cosθ = ?
cosecθ + cotθ = k అయినచో cosθ = ?

A) \( \frac{k² + 1}{k² – 1} \)

B) \( \frac{1 + k²}{1 – k²} \)

C) \( \frac{k² – 1}{k² + 1} \)

D) \( \frac{1 – k²}{1 + k²} \)

View Answer

C) \( \frac{k² – 1}{k² + 1} \)
Explanation:Given:
cosecθ + cotθ = k
Using identity:
(cosecθ + cotθ)(cosecθ – cotθ) = 1
Therefore:
cosecθ – cotθ = 1/k
Add equations:
2cosecθ = k + 1/k
cosecθ = (k² + 1)/(2k)
Similarly,
2cotθ = k – 1/k
cotθ = (k² – 1)/(2k)
Now:
cosθ = cotθ / cosecθ
= [(k² – 1)/(2k)] ÷ [(k² + 1)/(2k)] = (k² – 1)/(k² + 1)
Answer: (k² – 1)/(k² + 1)
39) If sin 2A = 2 sin A, then A = ?
sin 2A = 2 sin A, అయినచో A = ?

A) 60°

B) 45°

C) 30°

D) 0°

View Answer

D) 0°
Explanation:Given:
sin2A = 2sinA
Using identity:
2sinA cosA = 2sinA
2sinA(cosA – 1) = 0
Either:
sinA = 0
or
cosA = 1
Thus:
A = 0°
Answer: 0°
40) sin 60° cos 30° + sin 30° cos 60° = ?

A) 0

B) ½

C) 1

D) √3/2

View Answer

C) 1
Explanation:Using identity:
sinA cosB + cosA sinB = sin(A + B)
Therefore:
sin60° cos30° + sin30° cos60°
= sin(60° + 30°)
= sin90°
= 1
Answer: 1
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