Which are prisms among the following?

Nail

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Unsharpened pencil

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A box

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Both B and C

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Solution

The correct options are
B
Unsharpened pencil

C
A box

D
Both B and C

Usually, the unsharpened pencil has two hexagonal ends and six lateral faces. A box has two rectangular ends and four lateral faces. A table calendar has two triangular ends and three lateral faces. So, these three are the examples of the prism.

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Q. If eraser is called box, box is called pencil, pencil is called sharpener and sharpener is called bag, what will a child write with?

Q. If easer is called box, box is called pencil, pencil is called sharpener and sharpener is called bag, what will a child write with?

Which are prisms among the following?


(i)	(ii)

(iii)	(iv)

A Ramraj pencil box of dimensions 30cm × 5cm × 5cm consists of 10 sharpened cylindrical pencils placed in a vertical fashion each of length 20cm and diameter 1.4cm and having a conical surmount whose slant height is 2.5m. There are 2 rows of 5 pencils each. Find available volume in the box. Can a sharpener and an eraser in shape of a cube each of side 5cm be placed on top of the pencils such that sharpener is placed on top of the eraser.

Q. Statements: No eraser is a sharpener.
Some scales are pencils.
No sharpener is a scale.
Conclusions: I. At least some sharpners are pencils.
II. No eraser is a pencil.

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