mensuration Model Questions & Answers, Practice Test for ssc mts tier 1 2024
ssc mts tier 1 2024 SYLLABUS WISE SUBJECTS MCQs
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Power, Indices And Surds
Ratio & Proportion
Percentage
Time & Work
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Mensuration
The areas of the ends of a frustum of a cone are P and Q, where P < Q and H is its thickness. What is the volume of the frustum?
Answer: (a)
Volume of frustum
= ${π H}/3 (R^2 + r^2 + Rr)$
= ${π}/3H{(√{Q/π})^2 + (√{P/π})^2 + √{Q/π} √{P/π}}$
= ${πH}/3 (Q/π + P/π + {√{PQ}}/π)$
= $H/2 (P + Q + √{PQ})$
The angles x°, a°, c° and (π – b)° are indicated in the figure given belowWhich one of the following is correct?
Answer: (a)
∵ ∠PCT + ∠PCB = π
∠PCB = π – (π – b°) = b°
In ΔBPC,
∠PCB + ∠BPC + ∠PBC = π
⇒ ∠PBC = π – ∠PCB – ∠BPC
= π – b° – a°
∵∠ABE + ∠EBC = π (linear pair)
⇒ ∠ABE = π – ∠PBC = π– (π – b° – a°)
= a° + b° (∵ ∠PBC = ∠EBC)
Now, Sum of two interior angles = Exterior angle
∴ in ΔABE, ∠EAB + ∠ABE = ∠BES ⇒ c° + b° + a° = x°
∴ x° = a° + b° + c°
If the diagonal of a cube is of length l, then the total surface area of the cube is
Answer: (d)
Diagonal of a cube of side 'a'
= $√3$. a = l
∴ a = $l/√3$
total surface area of cube = 6 × $a^2$
= $6 × (l/√3)^2 = 2l^2$
A circular path is made from two concentric circular rings in such a way that the smaller ring when allowed to roll over the circumference of the bigger ring, it takes three full revolutions. If the area of the pathway is equal to n times the area of the smaller ring, then n is equal to
Answer: (a)
Let two cocentric circular rings with centre O and
Radius of large ring = $r_2$
Radius of smaller ring = $r_1$
Area of circular both
= Area of larger ring – Area of smaller ring ...(1)
Given circumference of larger ring = 3 × circumference of smaller ring
⇒ 2π$r_2 = 3 × 2πr_1$
⇒ $r_2 = 3r_1$
Also given
Area of circular both = n (area of smaller ring) ...(2)
Comparing (1) & (2) we have
Area of larger ring – Area of smaller ring
= n(Area of smaller ring)
⇒ $πr_2^2 - π1_1^2 = n(πr_1^2)$
⇒ $πr_2^2 (n + 1) πr_1^2$
⇒ $(n + 1)r_1^2 = r_2^2$
⇒ $(n + 1)r_1^2 = (3r_1)^2$
(∵ $r_2 = 31_1$)
⇒ n + 1 = 9
⇒ n = 8
∴ Option (c) is correct.
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