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Exercise 19A
Question 1:
Mark (✓) against the correct answer in each of Q.1 to Q.6.
A cuboid has
(a) length
(b) length and breadth only
(c) length, breadth and height
(d) thickness only
ANSWER:
A cuboid is a 3-dimensional figure. So, a cuboid has length, breadth and height.
Hence, the correct answer is option (c).
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Question 2:
Mark (✓) against the correct answer in each of Q.1 to Q.6.
A dice is an example of a
(a) cuboid
(b) cube
(c) cone
(d) cylinder
ANSWER:
(b) cube
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Question 3:
Mark (✓) against the correct answer in each of Q.1 to Q.6.
A gas pipe is an example of a
(a) cuboid
(b) cube
(c) cone
(d) cylinder
ANSWER:
(d) cylinder
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Question 4:
Mark (✓) against the correct answer in each of Q.1 to Q.6.
A football is an example of a
(a) cylinder
(b) cone
(c) sphere
(d) none of these
ANSWER:
(c) sphere
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Question 5:
Mark (✓) against the correct answer in each of Q.1 to Q.6.
A brick is an example of a
(a) cube
(b) cuboid
(c) prism
(d) cylinder
ANSWER:
(b) cuboid
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Question 6:
Mark (✓) against the correct answer in each of Q.1 to Q.6.
An ice-cream cone is an example of a
(a) cuboid
(b) cube
(c) pyramid
(d) none of these
ANSWER:
(d) None of these
Its a cone.
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Question 7:
Fill in the blanks:
(i) An object that occupies space is called a …… .
(ii) A cuboid has …… faces, …… edges and …… vertices.
(iii) The …… faces of a cuboid are identical.
(iv) A …… has no vertex and no edge.
(v) All the faces of a …… are identical.
(vi) A square pyramid has …… lateral triangular faces and …… edges.
(vii) A triangular pyramid has …… triangular lateral faces and …… edges.
(viii) A triangular prism has …… vertices, …… rectangular lateral faces, …… triangular bases and …… edges.
ANSWER:
(i) An object that occupies space is called a solid.
(ii) A cuboid has 6 rectangular faces, 12 edges and 8 vertices.
(iii) The opposite faces of a cuboid are identical.
(iv) A sphere has no vertex and no edge.
(v) All the faces of a cube are identical.
(vi) A square pyramid has 4 lateral triangular faces and 8 edges.
(vii) A triangular pyramid has 3 triangular lateral faces and 6 edges.
(viii) A triangular prism has 6 vertices, 3 rectangular lateral faces, 2 triangular bases and 9 edges.
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Question 8:
Give examples of four objects which are in the shape of:
(a) a cone
(b) a cuboid
(c) a cylinder
ANSWER:
(a) An ice cream cone, a conical tent, a clown’s cap and a conical vessel are in the shape of a cone.
(b) A wooden box, a match box, a brick and an almirah are in the shape of a cuboid.
(c) A measuring jar, a gas cylinder, a test tube and a circular pillar are in the shape of a cylinder.
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