Class 8 Exam  >  Class 8 Tests  >  Test: Rational Numbers- 2 - Class 8 MCQ

Test: Rational Numbers- 2 - Class 8 MCQ


Test Description

20 Questions MCQ Test - Test: Rational Numbers- 2

Test: Rational Numbers- 2 for Class 8 2024 is part of Class 8 preparation. The Test: Rational Numbers- 2 questions and answers have been prepared according to the Class 8 exam syllabus.The Test: Rational Numbers- 2 MCQs are made for Class 8 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Rational Numbers- 2 below.
Solutions of Test: Rational Numbers- 2 questions in English are available as part of our course for Class 8 & Test: Rational Numbers- 2 solutions in Hindi for Class 8 course. Download more important topics, notes, lectures and mock test series for Class 8 Exam by signing up for free. Attempt Test: Rational Numbers- 2 | 20 questions in 20 minutes | Mock test for Class 8 preparation | Free important questions MCQ to study for Class 8 Exam | Download free PDF with solutions
Test: Rational Numbers- 2 - Question 1

Which of the following is the reciprocal of the reciprocal of a rational number?

Test: Rational Numbers- 2 - Question 2

What number should be subtracted from -1 so as to get 5/3?

Detailed Solution for Test: Rational Numbers- 2 - Question 2

To find the number that should be subtracted from -1 to get 5/3, we need to perform the following calculation:

-1 - x = 5/3

To isolate x, we can rearrange the equation:

x = -1 - 5/3

To simplify the right side of the equation, we need to find a common denominator:

x = -3/3 - 5/3 x = (-3 - 5)/3

 x = -8/3

Therefore, the number that should be subtracted from -1 to get 5/3 is -8/3. Thus, option 1 is the correct answer.

1 Crore+ students have signed up on EduRev. Have you? Download the App
Test: Rational Numbers- 2 - Question 3

Find the multiplicative inverse of 1/4.

Detailed Solution for Test: Rational Numbers- 2 - Question 3

In multiplicative inverse we reciprocal the numbers by which we get the answer =1 that's why 1/4×4/1 which we consider as 4 so 4 is the multiplicative inverse of 1/4

Test: Rational Numbers- 2 - Question 4

Write the additive inverse of 4/5.

Detailed Solution for Test: Rational Numbers- 2 - Question 4

additive inverse means adding what number will give you zero 
so let that no be x 
x + 4/5 = 0
x = -4/5
trick : just change the sign of number

Test: Rational Numbers- 2 - Question 5

Which of the following is the Multiplicative identity for rational numbers?

Detailed Solution for Test: Rational Numbers- 2 - Question 5

1 is the Multiplicative identity for rational numbers.

Test: Rational Numbers- 2 - Question 6

Which of the following forms a pair of equivalent rational numbers? 

Detailed Solution for Test: Rational Numbers- 2 - Question 6

When we have to compare two rational numbers, we first make their denominators equal and then compare their numerators.

Similarly, on checking the remaining options we find that -25/35 and 55/-77 is the only pair of equivalent rational numbers.

Test: Rational Numbers- 2 - Question 7

________ is not associative for rational numbers.

Detailed Solution for Test: Rational Numbers- 2 - Question 7

This is how associative property works. It states that you can add or multiply numbers regardless of how they are grouped. Addition and multiplication are associative for rational numbers. Subtraction and division are not associative for rational numbers.

Test: Rational Numbers- 2 - Question 8

The value of ½ + ¼ is equal to:

Detailed Solution for Test: Rational Numbers- 2 - Question 8

½ + ¼

Making the denominator equal:

2/4 + ¼ = (2 + 1)/4 = ¾

Test: Rational Numbers- 2 - Question 9

Which of the following is the product of 7/8 and -4/21?

Detailed Solution for Test: Rational Numbers- 2 - Question 9

Test: Rational Numbers- 2 - Question 10

Compare 

Detailed Solution for Test: Rational Numbers- 2 - Question 10

Expressing in standard form, we get  
Express each rational number with L.C.M as denominator. L.C.M of 9 and 5 is 9×5 = 45.


Comparing the numerators, we have 

−40 <−36. 

∴ 

Test: Rational Numbers- 2 - Question 11

_____ is the only rational number that is equal to its reciprocal. 

Detailed Solution for Test: Rational Numbers- 2 - Question 11

1 because the reciprocal of 1 is 1/1 which is equal to 1.

Test: Rational Numbers- 2 - Question 12

________ are closed under subtraction.

Detailed Solution for Test: Rational Numbers- 2 - Question 12

Rational numbers are closed under subtraction.Because if we subtract a rational number with another rational number we will get rational number. For example 45−35 = 10, which is also a rational number.
Correct option is C.

Test: Rational Numbers- 2 - Question 13

Zero has ________ reciprocal.

Detailed Solution for Test: Rational Numbers- 2 - Question 13

Zero has no reciprocal. Because 1/0 is not defined and also remember any number multiplied by zero gives 0. Therefore, if reciprocal was supposed to be there then that reciprocal when multiplied by 0 should give 1 which is not possible.

Test: Rational Numbers- 2 - Question 14

The product of two rational numbers is always a _______.

Detailed Solution for Test: Rational Numbers- 2 - Question 14

Product of two rational numbers is always a rational number.
For example,
1/2 + 1/2 = 1

Test: Rational Numbers- 2 - Question 15

A number which can be written in the form, p/q where p and q are integers and _____ is called a rational number.

Detailed Solution for Test: Rational Numbers- 2 - Question 15

Given, A rational number is defined as a number that can be expressed in the form p/q , where p and q are integers

We have to find the condition that satisfies the definition.

A number that can be expressed in the form p/q , where p and q are integers and q ≠ 0, is called a rational number.

Therefore, the condition that satisfies the definition is q ≠ 0

Test: Rational Numbers- 2 - Question 16

Find the multiplicative inverse of 2/9.

Detailed Solution for Test: Rational Numbers- 2 - Question 16

Multiplicative inverse is nothing but a reciprocal of a number 2/9 which is 9/2.

Test: Rational Numbers- 2 - Question 17

The product of two numbers is -20/9. If one of the numbers is 4, find the other. 

Detailed Solution for Test: Rational Numbers- 2 - Question 17

Let the other number be R
One number = 4
Given,
4*R = -20/9
Therefore, R = 
= -5/9

Test: Rational Numbers- 2 - Question 18

Find a rational number between 1/4 and 1/2.

Detailed Solution for Test: Rational Numbers- 2 - Question 18

A rational number between a and b is (a + b)/2
clearly it is there half so it will be between them
where a and b are numbers
a = 1/4, b = 1/2
Therefore, rational no. between 1/4 and 1/2 is
= (1/4 + 1/2)/2
=  [(1 + 2)/4]/2 
= 3/8

Test: Rational Numbers- 2 - Question 19

1 is the __________ for rational numbers.

Detailed Solution for Test: Rational Numbers- 2 - Question 19

If you multiply any number with 1,the product will always be the same number which you multiply with 1. Therefore, 1 is the multiplicative identity.

Test: Rational Numbers- 2 - Question 20

_______ are closed under addition.

Detailed Solution for Test: Rational Numbers- 2 - Question 20

Rational Numbers: This set is closed under addition, subtraction, multiplication, and division (with the exception of division by 0).

Information about Test: Rational Numbers- 2 Page
In this test you can find the Exam questions for Test: Rational Numbers- 2 solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Rational Numbers- 2, EduRev gives you an ample number of Online tests for practice

Top Courses for Class 8

Download as PDF

Top Courses for Class 8