5 Marks Questions

Question 15 Marks

Here are the shadows of some $3-D$ objects, when seen under the lamp of an Over$-$head projector. Identify the solid$(s)$ that match each shadow. $($There may be multiple answers for these$.)$

Answer

$i.$ Circle $-$ ball, a plate
$ii.$ Square $-$ dice
$iii.$ Triangle $-$ Prism
$iv.$ Rectangle $-$ notebook, box etc.

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Question 25 Marks

What cross$-$sections do you get when you give a
$i.$ vertical cut
$ii.$ horizontal cut to the following solids?
$a.$ A brick
$b.$ A round apple
$c.$ A die
$d.$ A circular pipe
$e.$ An ice cream cone

Answer

$a.$ Brick: It is rectangular so any cut will get a rectangle.
$i.$ A rectangle in a vertical cut.

$ii.$ A rectangle in a horizontal cut.

$iii.$ A round figure: It will cut to a circle in both ways.

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Question 35 Marks

Identify the nets which can be used to make cubes $($cut out copies of the nets and try it$):$

Answer

$i.$ Can’t make a cube as folding won’t get us the front edge.
$ii.$ Can make a cube if we fold the bottom three upright and top three upright.
$iii.$ Can make a cube by folding last two sideways and top two left side ways.
$iv.$ Can make a cube by folding single ones to make front back and top edge.
$v.$ Can’t make a cube as back edge will be open on folding.
$vi.$ Can make a cube by folding $4$ in a row left wise.

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Maths 5 Marks Questions

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