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Here are 20 multiple-choice questions (MCQs) with answers numbered 121 to 140 based on the syllabus content of Mensuration for AP DDSC Secondary Grade Teacher SGT MCQs 2025:

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121. What is the formula for the perimeter of a rectangle?
a) 2 × (length + breadth)
b) length × breadth
c) length + breadth
d) (length + breadth) ÷ 2
Answer: a) 2 × (length + breadth)

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122. The area of a square with side 5 cm is:
a) 20 cm²
b) 25 cm²
c) 10 cm²
d) 15 cm²
Answer: b) 25 cm²

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123. Which of the following is the correct formula for the volume of a cuboid?
a) length + breadth + height
b) length × breadth × height
c) 2 × (length + breadth + height)
d) length × breadth
Answer: b) length × breadth × height

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124. What is the perimeter of an equilateral triangle with side 6 cm?
a) 18 cm
b) 12 cm
c) 24 cm
d) 6 cm
Answer: a) 18 cm

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125. The surface area of a cube with side ‘a’ is:
a) a³
b) 6a²
c) 4a²
d) 2a²
Answer: b) 6a²

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126. Which figure has a rotational symmetry of 180 degrees?
a) Square
b) Rectangle
c) Equilateral triangle
d) Parallelogram
Answer: d) Parallelogram

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127. The area of a circle is given by the formula:
a) πr
b) 2πr
c) πr²
d) πd
Answer: c) πr²

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128. If the radius of a cylinder is 7 cm and height is 10 cm, the volume is:
a) 1540 cm³
b) 154 cm³
c) 770 cm³
d) 440 cm³
Answer: a) 1540 cm³ (Volume = πr²h = 3.14 × 7² × 10 = 1539.8 cm³ ≈ 1540 cm³)

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129. The perimeter of a rhombus with side 8 cm is:
a) 32 cm
b) 64 cm
c) 16 cm
d) 24 cm
Answer: a) 32 cm (Perimeter = 4 × side = 4 × 8 = 32 cm)

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130. The area of a trapezium is calculated using which formula?
a) ½ × (sum of parallel sides) × height
b) base × height
c) length × breadth
d) perimeter × height
Answer: a) ½ × (sum of parallel sides) × height

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131. Which unit is used to measure capacity?
a) Kilogram
b) Liter
c) Meter
d) Second
Answer: b) Liter

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132. The formula for the surface area of a cylinder is:
a) 2πr² + 2πrh
b) πr²h
c) 2πr + 2h
d) πd × h
Answer: a) 2πr² + 2πrh

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133. What is the volume of a cube with edge length 4 cm?
a) 64 cm³
b) 16 cm³
c) 12 cm³
d) 48 cm³
Answer: a) 64 cm³ (Volume = a³ = 4³ = 64)

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134. How many faces does a cuboid have?
a) 4
b) 5
c) 6
d) 8
Answer: c) 6

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135. The perimeter of a polygon is:
a) The total length of all its sides
b) The area inside the polygon
c) The distance between two vertices
d) Half the sum of all sides
Answer: a) The total length of all its sides

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136. The capacity of a container is measured in:
a) Liters
b) Meters
c) Kilograms
d) Seconds
Answer: a) Liters

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137. The line of symmetry divides a figure into:
a) Unequal parts
b) Two identical parts
c) Three parts
d) Four parts
Answer: b) Two identical parts

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138. The area of a parallelogram is given by:
a) base × height
b) 2 × (base + height)
c) ½ × base × height
d) side × height
Answer: a) base × height

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139. The volume of a cuboid is 1200 cm³. If the length is 10 cm and breadth is 6 cm, find the height:
a) 20 cm
b) 15 cm
c) 12 cm
d) 10 cm
Answer: c) 20 cm (Volume = l × b × h → 1200 = 10 × 6 × h → h = 20)

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140. Which of the following is true for the area of a square and rectangle with same perimeter?
a) Square’s area is greater
b) Rectangle’s area is greater
c) Both are equal
d) Cannot be determined
Answer: a) Square’s area is greater

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