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MATHS 1 Marks Question

Volume and Surface Area of Solids · Bihar Board (BSEB) STD 8 (BSEB - English Medium). 5 questions.

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Question 11 Mark
Fill in the blanks. If $l, b, h$ be the length, breadth and height of a cuboid, then its lateral surface area $=$ ________ sq units.
Answer
If $l, b, h$ be the length, breadth and height of a cuboid, then its lateral surface area $= 2(l + b) × h) sq$ units.
​​​​​​​Solution: If $l, b$ and $h$ are the length, breadth and height of a cuboid, respectively, then its lateral surface area is equal to $2(l + b) × h) sq$ units.
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Question 21 Mark
Fill in the blanks. If $r$ is the radius of the base and $h$ be the height of a cylinder, then its lateral surface area is ________ sq units.
Answer
If $r$ is the radius of the base and $h$ be the height of a cylinder, then its lateral surface area is $2\pi\text{rh}$ sq units.
Solution: If $r$ and $h$ are the radius of the base and height of a cylinder, then its lateral surface area is $2\pi\text{rh}$ sq units.
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Question 31 Mark
Fill in the blanks. If $r$ is the radius of the base and $h$ be the height of a cylinder, then its volume is __________ cubic units.
Answer
If $r$ is the radius of the base and $h$ be the height of a cylinder, then its volume is $\pi\text{r}^2\text{h}$ cubic units.
Solution: If $r$ and $h$ are the radius of the base and height of a cylinder, respectively, then its volume is $\pi\text{r}^2\text{h}$ cubic units.
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Question 41 Mark
Fill in the blanks. If $l, b, h$ be the length, breadth and height of a cuboid, then its whole surface area $=$ ________ sq units.
Answer
If $l, b, h$ be the length, breadth and height of a cuboid, then its whole surface area $= 2(lb + lh + bh)$ sq units. Solution: If $l, b$ and $h$ are the length, breadth and height of a cuboid, respectively, then its whole surface area is equal to $2(lb + lh + bh)\ sq$ units.
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Question 51 Mark
Fill in the blanks.
If each side of a cube is a, then its lateral surface area is ______ sq units.
Answer
If each side of a cube is a, then its lateral surface area is $4a^2$ sq units.
Solution:
If each side of a cube is a, then the lateral surface area is $4a^2$ sq units.
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