Question

Two students Kabir and Rohan of class X were playing near the street lamp. At a time Kabir noticed the length of shadow of Rohan when he was running away from the street lamp. If the height of Rohan is 140cm, the height street lamp is 4.6m more than the height of Rohan and speed of Rohan is 4m/s, then the length of Rohan's shadow is t after 8 s.

Now, answer the following questions:

Q. 24 Which of the pair of triangles are similar?

a) AQPR-ARMN

b) APRO-ARNM

c) AQRP-AMNR

d) APQR-AMNR

Q.25 Distance of Rohan from street lamp after 8 seconds:

a) 22m

b) 27m

c) 32m

Q 26 Find the length of Rohan's shadow after 8s:

d) 38m

a) 9m

b) 9.73m

c) 12m

d) 13m

Q. 27 The shortest distance between top of street lamp and the end of the shadow is:

a) 42.15m

b) 41.73m

c) 50m

d) 40m​

Answer 1

Answer:

a

b

Mathematics NCERT Grade 7, Chapter 12: Algebraic Expressions- The chapters discuss concepts related to algebraic expressions.

After a short introduction, the first section discusses How are expressions formed?

Algebraic expressions are formed from variables and constants.

This is followed by the topics terms, factors, and coefficients.