mathematics

The surface area of a cuboid of length l, breadth b and height h is

• lbh

• lb + bh + hl

• 2 (lb + bh + hl)

• 2(l + b)h.

The surface area of a cube of edge a is

• 4a²

• 6a²

• 3a²

• a²

The volume of a cylinder of base radius r and height h is

• 2πrh

• πr²h

• 2πr (r + h)

• 13 πr²h.

The area of a rhombus is 60 cm². One diagonal is 10 cm. The other diagonal is

• 6 cm

• 12 cm

• 3 cm

• 24 cm

The expression x + 3 is in

• one variable

• two variables

• no variable

• none of these.

The value of x² – 2x + 1 when x = 1 is

• 1

• 2

• -2

• 0

The value of x² – xy + y² when x = 0, y = 1 is

• 0

• -1

• 1

• none of these

Which of the following is a trinomial ?

• -7z

• z² – 4y²

• x²y – xy² + y²

• 12a – 9ab + 5b – 3

How many terms are there in the expression 7x² + 5x – 5 ?

• 1

• 2

• 3

• 5

The coefficient in the term 20 is

• 1

• 2

• 10

• 20