Secondary School (English Medium) (5 to 8) Class 7 - CBSE Question Bank Solutions

A door of length 2 m and breadth 1 m is fitted in a wall. The length of the wall is 4.5 m and the breadth is 3.6 m (see the given figure). Find the cost of white washing the wall, if the rate of white washing the wall is Rs 20 per m²

Construct 3 equations starting with x = 2

Construct 3 equations starting with x = -2

Observe the patterns of digits made from line segments of equal length. You will find such segmented digits on the display of electronic watches or calculators.

If the number of digits formed is taken to be n, the number of segments required to
form n digits is given by the algebraic expression appearing on the right of each pattern.

How many segments are required to form 5, 10, 100 digits of the kind −

Observe the patterns of digits made from line segments of equal length. You will find such segmented digits on the display of electronic watches or calculators.

If the number of digits formed is taken to be n, the number of segments required to form n digits is given by the algebraic expression appearing on the right of each pattern.

How many segments are required to form 5, 10, 100 digits of the kind − 

Observe the patterns of digits made from line segments of equal length. You will find such segmented digits on the display of electronic watches or calculators.

If the number of digits formed is taken to be n, the number of segments required to form n digits is given by the algebraic expression appearing on the right of each pattern.

How many segments are required to form 5, 10, 100 digits of the kind −

Use the given algebraic expression to complete the table of number patterns.

By applying the ASA congruence rule, it is to be established that ∆ABC ≅ ∆QRP and it is given that BC = RP. What additional information is needed to establish the congruence?

In Fig, can you use the ASA congruence rule and conclude that ∆AOC ≅ ∆BOD?

Given below are measurements of some parts of two triangles. Examine whether the two triangles are congruent or not, by the ASA congruence rule. In the case of congruence, write it in symbolic form.

∆DEF, ∠D = 60º, ∠F = 80º, DF = 6 cm.

∆PQR, ∠Q = 60º, ∠R = 80º, QP = 6 cm.

Simplify and write the answer in the exponential form.

[(2²)³ x 3⁶] x 5⁶

Simplify: `(12^4 xx 9^3 xx 4)/(6^3 xx 8^2 xx 27)`

Simplify: `(2 xx 3^4 xx 2^5)/(9 xx 4^2)`

Write exponential form for 8 × 8 × 8 × 8 taking base as 2.

In the given figure, Identify three linear pairs.

Add: `-2/3 + 3/8`

Satpal walks `2/3 "km from a place P, towards the east and then from there"  1 5/7` km towards west. Where will he be now from P?

Heena’s father paid an electric bill of ₹ 385.70 out of a 500 rupee note. How much change should he have received?

The normal body temperature is 98.6°F. When Savitri was ill her temperature rose to 103.1°F. How many degrees above normal was that?

In her science class, Jyoti learned that the atomic weight of Helium is 4.0030; of Hydrogen is 1.0080; and of Oxygen is 16.0000. Find the difference between the atomic weights of Oxygen and Hydrogen