Secondary School (English Medium) (5 to 8) कक्षा ८ - CBSE Question Bank Solutions for Mathematics

A car is travelling 48 km in one hour. The distance travelled by the car in 12 minutes is ______.

An auto rickshaw takes 3 hours to cover a distance of 36 km. If its speed is increased by 4 km/h, the time taken by it to cover the same distance is ______.

If the thickness of a pile of 12 cardboard sheets is 45 mm, then the thickness of a pile of 240 sheets is ______ cm.

In direct proportion, `a_1/b_1` ______ `a_2/b_2`

If the area occupied by 15 postal stamps is 60 cm², then the area occupied by 120 such postal stamps will be ______.

If 45 persons can complete a work in 20 days, then the time taken by 75 persons will be ______ hours.

Devangi travels 50 m distance in 75 steps, then the distance travelled in 375 steps is ______ km.

Two quantities x and y are said to vary directly with each other if for some rational number k, xy = k.

When the distance is kept fixed, speed and time vary directly with each other.

Length of a side of a square and its area vary directly with each other.

If x and y are in direct proportion, then (x – 1) and (y – 1) are also in direct proportion.

When two quantities are related in such a manner that, if one increases, the other also increases, then they always vary directly.

The number of workers and the time to complete a job is a case of direct proportion.

For fixed time period and rate of interest, the simple interest is directly proportional to the principal.

The area of cultivated land and the crop harvested is a case of direct proportion.

Write whether the following statement vary directly, vary inversely with each other, or neither of the two.

The distance travelled by CNG bus and the amount of CNG used.

Write whether the following statement vary directly, vary inversely with each other, or neither of the two.

Income tax and the income.

Write whether the following statement vary directly, vary inversely with each other, or neither of the two.

Distance travelled by an auto-rickshaw and time taken.

Write whether the following statement vary directly, vary inversely with each other, or neither of the two.

Number of students in a hostel and consumption of food.

Write whether the following statement vary directly, vary inversely with each other, or neither of the two.

Area of the walls of a room and the cost of white washing the walls.