RS Aggarwal - Mathematics

Book: RS Aggarwal - Mathematics

Chapter: 2. Exponents

Subject: Maths - Class 8th

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Chapter Exercises

Exercise 2A
Exercise 2B
Exercise 2C
CCE Test Paper-2

Exercise 2A

1

Evaluate:

(i) 4-3

(ii)

(iii)

(iv) (-3)-4

(v)

2

Evaluate:

(i)


(ii)


(iii)


(iv)

3

Evaluate:

(i)


(ii)


(iii)

4

Evaluate:

(i)


(ii)


(iii)

5

Evaluate

6

Evaluate

7

Evaluate [(5-1 × 3-1)-1 ÷ 6-1]
8

Find the value of:

(i) (20 + 3-1) × 32

(ii) (2-1 × 3-1) ÷ 2-3

(iii)

9

Find the value of x for which
10

Find the value of x for which
11

By what number should (-6)-1 be multiplied so that the product becomes 9-1?
12

By what number should be divided so that the quotient may be?
13

If , find the value of x.

Exercise 2B

1

Write each of the following numbers in standard form:

(i) 57.36


(ii) 3500000


(iii) 273000


(iv) 168000000


(v) 4630000000000


(vi) 345 x105
2

Write each of the following numbers in usual form:

(i) 3.74 × 105


(ii) 6.912 × 108


(iii) 4.1253 × 107


(iv) 2.5 × 104


(v) 5.17 × 108


(vi) 1.679 × 109
3

The height of Mount Everest is 8848 m. Write it in standard form.
3

The speed of light is 300000000 m/sec. express it in standard form.
3

The distance from the earth to the sun is 149600000000 m. Write it in standard form.
4

Mass of earth is (5.97 x 1024) kg and mass of moon is (7.35 x 1022) kg. What is the total mass of the two?
5

Write each of the following numbers in standard form:

(i) 0.0006


(ii) 0.00000083


(iii) 0.0000000534


(iv) 0.0027


(v) 0.00000165


(vi) 0.00000000689
6

1 micron = m. Express it in standard form.
6

Size of a bacteria = 0.0000004 m. Express it in standard form.
6

Thickness of a paper = 0.03 mm. Express it in standard form.
7

Write each of the following numbers in usual form:

(i) 2.06x10-5


(ii) 5 x10-7


(iii) 6.82 x 10-6


(iv) 5.673x10-4


(v) 1.8 x10-2


(vi) 4.129 x10-3

Exercise 2C

1

The value of is
2

The value of is
3

The value of is
4

(2-5 ÷ 2-2) = ?
5

The value of is
6

7

8

=?
9

The value of x for which is
10

If , then x is equal to
11

12

13

14

15

3670000 in standard form is
16

0.0000463 in standard form is
17

0.000367 × 104 in usual form is

CCE Test Paper-2

1

Evaluate

(i) 3-4


(ii) (-4)3


(iii)


(iv)

2

Evaluate:

3

Simplify:

4

By what number should be divided so that the quotient is ?
5

By what number should be multiplied so that the quotient is ?
6

Express each of the following in standard form:

(i) 345


(ii) 180000


(iii) 0.000003


(iv) 0.000027
7

The value of is
8

The value of is
9

10

If , then x=?
11

12

13

14

Fill in the blanks.

(i) 360000 written in standard form is…..


(ii) 0.0000123 written in standard form is…..


(iii)


(iv) in usual form is…..


(v) in usual form is…..