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Mensuration
Class 8 made by Ms Simmi Khosla
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1. The volume of a cube is 125 cm*3. Its surface area is:
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2 points
25 cm*2
125 cm*2
150 cm*2
250 cm*2
2. If the radius of a cylinder is tripled but its curved surface area is unchanged, then its height will be :
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2 points
Constant
Tripled
One-sixth
One-third
3. The volume of a cube whose each edge is 2x is:
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2 points
8x*3
4x*3
6x*3
2x*3
4. Three cubes of metal whose edges are 6 cm, 8 cm and 10cm respectively are melted to form a single cube. The edge of the new cube is:
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2 points
12 cm
24 cm
20 cm
18 cm
5. If a cube fits exactly in a cylinder with height h, then the volume of the cube is:
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2 points
h
h*2
h*3
πh
6. The volume of a water tank is 3 m*3. Its capacity in litres is:
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2 points
30
300
3000
None of these
7. If the ratio of the surface areas of two cubes is 1: 9, then the ratio of their volumes is:
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2 points
1 : 9
1 : 18
1 : 27
1 : 36
8. If we double the diagonals of a rhombus, then its area increases by:
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2 points
2 times its original area
4 times its original area
One half times its original area
One-fourth times its original area
9. If the radii of two cylinders of same volume are in the ratio 1 : 6, then ratio of their heights is:
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2 points
6:1
12:1
24:1
36:1
10. The surface area of an open box whose length is l, breadth is b and height is h is represented by:
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2 points
2(lb + bh + hl)
2(lb + bh) + hl
2(bh + hl) + lb
2(lb + hl) + bh
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