Questions by Arun

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An aquarium is in the form of a cuboid whose external measures are `80 cm xx 30 cm xx 40 cm`. The base, side faces and back face are to be covered with a coloured paper. Find the area of the paper

asked Jan 17, 2022 in 8th-maths

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There are two cuboidal boxes as shown in the adjoining figure. Which box requires the lesser amount of material to

asked Jan 17, 2022 in 8th-maths

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Rukhsar painted the outside of the cabinet of measure `1 m xx 2 m xx 1.5 m`. How much surface area did she cover if she painted all except the bottom of the

asked Jan 17, 2022 in 8th-maths

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A godown is in the form of a cuboid of measures `60 m xx 40 m xx 30 m`. How many cuboidal boxes can be stored in it if the volume of one box is 0.8 `m^3`

asked Jan 17, 2022 in 8th-maths

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A rectangular paper of width 14 cm is rolled along its width and a cylinder of radius 20 cm is formed. Find the volume of the cylinder (Fig 11.45)? (Take `22/7` for

asked Jan 17, 2022 in 8th-maths

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Given a cylindrical tank, in which situation will you find surface area and in which situation volume. To find the number of smaller tanks that can be filled with water from

asked Jan 17, 2022 in 8th-maths

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Diameter of cylinder A is 7 cm, and the height is 14 cm. Diameter of cylinder B is 14 cm and height is 7 cm. Without doing any calculations can you suggest whose volume is greater? Verify it by finding thevolume of both the cylinders. Check whether the cylinder with greater volume also has greater surface

asked Jan 17, 2022 in 8th-maths

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If each edge of a cube is doubled, how many times will its surface area

asked Jan 17, 2022 in 8th-maths

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If each edge of a cube is doubled, how many times will its volume

asked Jan 17, 2022 in 8th-maths

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Simplify `2^5 ÷ 2^(– 6)`

asked Jan 17, 2022 in 8th-maths

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Evaluate. `(– 4)^(– 2)`

asked Jan 17, 2022 in 8th-maths

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Find the value of. `(3° + 4^(– 1)) xx

asked Jan 17, 2022 in 8th-maths

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Express the following numbers in usual form. `3.52 xx

asked Jan 17, 2022 in 8th-maths

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Express the following numbers in usual form. `7.54 xx 10^(– 4)`

asked Jan 17, 2022 in 8th-maths

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The cost of 5 metres of a particular quality of cloth is Rs 210. Tabulate the cost of 2, 4, 10 and 13 metres of cloth of the same

asked Jan 17, 2022 in 8th-maths

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The scale of a map is given as 1:30000000. Two cities are 4 cm apart on the map. Find the actual distance between

asked Jan 17, 2022 in 8th-maths

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A mixture of paint is prepared by mixing 1 part of red pigments with 8 parts of base. In the following table, find the parts of base that need to be added.

asked Jan 17, 2022 in 8th-maths

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Rehman is making a wheel using spokes. He wants to fix equal spokes in such a way that the angles between any pair of consecutive spokes are equal. Help him bycompleting the following table. sss 8 → 45°, 10 → 36°, 12 → 30° sss How many spokes would

asked Jan 17, 2022 in 8th-maths

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A contractor estimates that 3 persons could rewire Jasminder’s house in 4 days. If, he uses 4 persons instead of three, how long should they take to complete the

asked Jan 17, 2022 in 8th-maths

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