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Test: Exponents and Powers


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20 Questions MCQ Test Mathematics (Maths) Class 7 | Test: Exponents and Powers

Test: Exponents and Powers for Class 7 2022 is part of Mathematics (Maths) Class 7 preparation. The Test: Exponents and Powers questions and answers have been prepared according to the Class 7 exam syllabus.The Test: Exponents and Powers MCQs are made for Class 7 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Exponents and Powers below.
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Test: Exponents and Powers - Question 1

Express 256 as a power 4.

Detailed Solution for Test: Exponents and Powers - Question 1

4*4*4*4 = 256

256 = 44

So option B is the correct answer. 

Test: Exponents and Powers - Question 2

Express 729 as a power of 3.

Detailed Solution for Test: Exponents and Powers - Question 2

So option C is the correct answer. 

Test: Exponents and Powers - Question 3

Express 2048 as a power 2.

Detailed Solution for Test: Exponents and Powers - Question 3

 2048 = 2 x 1024

= 2 x 2 x 512

= 2 x 2 x 2 x 256

= 2 x 2 x 2 x 2x 128

= 2 x 2 x 2 x 2 x 2 x 64

= 2 x 2 x 2 x 2 x 2 x 2 x 32

= 2 x 2 x 2 x 2 x 2 x 2 x 2 x 16

= 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 8

= 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2

= 211

So option B is the correct answer. 

Test: Exponents and Powers - Question 4

Which of the following is the value of (4 / 5)-9 / (4 / 5)9?

Detailed Solution for Test: Exponents and Powers - Question 4

Test: Exponents and Powers - Question 5

Express 432 as a product of powers of prime factors.

Detailed Solution for Test: Exponents and Powers - Question 5

Prime factorization of 432 is,

432 =2×2×2×2×3×3×3

to express this as power

432=(2)×(3)³

Test: Exponents and Powers - Question 6

The value of (−1)55 is

Detailed Solution for Test: Exponents and Powers - Question 6

If any power having a odd number is raised to -1 then result will be -1

So (−1)55 = -1

So option B is correct answer. 

Test: Exponents and Powers - Question 7

The value of (−1)500 is

Detailed Solution for Test: Exponents and Powers - Question 7

If any power having a even number is raised to -1 then the  result will be 1

Since the power is an even number , So (−1)500 =  1 

Test: Exponents and Powers - Question 8

The value of (−1)47 is

Detailed Solution for Test: Exponents and Powers - Question 8

If any power having a odd number is raised to -1 then result will be -1

So (−1)47 = -1

So option A is correct answer. 

Test: Exponents and Powers - Question 9

The value of (−1)400 is

Detailed Solution for Test: Exponents and Powers - Question 9

If any power having an even number is raised to -1 then the  result will be 1

Since the power is an even number , So (−1)400 =  1 

So option A is the correct answer. 

Test: Exponents and Powers - Question 10

Anu wanted to score 26 points in the game of cards, but ends up only 8/3 points. By how many points did she fail short?

Detailed Solution for Test: Exponents and Powers - Question 10

Points by which Anu fell short is

= 26 - 8/3 = (78 - 8)/3

= 70/3

Test: Exponents and Powers - Question 11

Simplify 254/53

Detailed Solution for Test: Exponents and Powers - Question 11

254/5= (52)4/53=58/53=58-3=55

Test: Exponents and Powers - Question 12

 can de written in exponential form as 

Detailed Solution for Test: Exponents and Powers - Question 12

 a × a × a × c × c × c × c × d = a3 × c4 × d

Test: Exponents and Powers - Question 13

512 can de written in exponential form as 

Detailed Solution for Test: Exponents and Powers - Question 13

512=8*8*8=83=(23)3=23*3=29

Test: Exponents and Powers - Question 14

 What is the reciprocal of (-3 / 4)0?

Detailed Solution for Test: Exponents and Powers - Question 14

Anything raised to the power zero is 1 . 

Test: Exponents and Powers - Question 15

 can be written as 

Detailed Solution for Test: Exponents and Powers - Question 15

(-2)3(-10)3=(-2)*(-2)*(-2)*(-10)*(-10)*(-10), which is the expansion of the exponential forms which means the power depicts how many times a number is multiplied.

Test: Exponents and Powers - Question 16

In 2the exponent is

Detailed Solution for Test: Exponents and Powers - Question 16

Exponents, or powers, are a way of indicating that a quantity is to be multiplied by itself some number of times. In the expression 252 is called the base and 5 is called the exponent, or power.

Test: Exponents and Powers - Question 17

The value of (4- 20) x 5is

Detailed Solution for Test: Exponents and Powers - Question 17

Anything raised to the power zero is 1 .

In the given expression,  (4- 20) x 50

                                             = (1 - 1) x 1

                                      = ( 0 ) x 1

                                      = 0

So Option B is correct answer. 

Test: Exponents and Powers - Question 18

If a = 3 and b = 4 then find the value of aa + bb

Detailed Solution for Test: Exponents and Powers - Question 18

Given, a = 3 and b = 4 

aa + b= 33 + 4= 3 x 3 x 3 + 4 x 4 x 4 x 4

                            = 27 + 16 x 16 

                            = 27 + 256

                            = 283

So option A is the correct answer. 

Test: Exponents and Powers - Question 19

(2/7)2 x (2/7)4 is equal to:

Detailed Solution for Test: Exponents and Powers - Question 19

Whenever you multiply two terms with the same base, you can add the exponents:

( x m ) ( x n ) = x( m + n )

So (2/7)2 x (2/7)4  = (2/7)6

So option C is the correct answer. 

Test: Exponents and Powers - Question 20

1 lakh is equal to 

Detailed Solution for Test: Exponents and Powers - Question 20

1 lakh is equal to 10

So option A is the correct answer. 

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