Secondary School (English Medium) (5 to 8) Class 8 - CBSE Question Bank Solutions

The areas of any two faces of a cuboid are equal.

The surface area of a cuboid formed by joining face to face 3 cubes of side x is 3 times the surface area of a cube of side x.

Two cuboids with equal volumes will always have equal surface areas.

Find the length of the largest pole that can be placed in a room of dimensions 12 m × 4 m × 3 m.

A cuboidal tin box opened at the top has dimensions 20 cm × 16 cm × 14 cm. What is the total area of metal sheet required to make 10 such boxes?

Find the capacity of water tank, in litres, whose dimensions are 4.2 m, 3 m and 1.8 m?

Three cubes each of side 10 cm are joined end to end. Find the surface area of the resultant figure.

Below are the drawings of cross sections of two different pipes used to fill swimming pools. Figure A is a combination of 2 pipes each having a radius of 8 cm. Figure B is a pipe having a radius of 15 cm. If the force of the flow of water coming out of the pipes is the same in both the cases, which will fill the swimming pool faster?

External dimensions of a closed wooden box are in the ratio 5:4:3. If the cost of painting its outer surface at the rate of Rs 5 per dm² is Rs 11,750, find the dimensions of the box.

A rectangular sheet of dimensions 25 cm × 7 cm is rotated about its longer side. Find the volume and the whole surface area of the solid thus generated.

Let abc be a three-digit number. Then abc – cba is not divisible by ______.

Let abc be a three digit number. Then abc + bca + cab is not divisible by ______.

If the sum of digits of a number is divisible by three, then the number is always divisible by ______.

If x + y + z = 6 and z is an odd digit, then the three-digit number xyz is ______.

3134673 is divisible by 3 and ______.

Number of the form 3N + 2 will leave remainder 2 when divided by 3.

Find the multiplicative inverse of -13

Find the multiplicative inverse `(-13)/19`

Find the multiplicative inverse  `(-5)/8 xx (-3)/7`

Find the multiplicative inverse of `1/5`