MCQ Questions for Class 8 Maths - Linear Equations in One Variable

1: In the equation x/4 + 5/2 = 3/4, transposing 5/2 to RHS, we get:

(i)
(ii)

(iii) 
(iv) none of these

2: In the equation 3x = 4 – x , transposing (–x) to LHS, we get: 

(i) 3x – x = 4
(ii) 3x + x = 4
(iii) –3x + x = 4
(iv) –3x – x = 4

3: then which of the following correct?

(i) 
(ii) 
(iii) 
(iv) none of these

4: If 7x + 15 = 50, then which of the following is the root of the equation?

(i) –5
(ii) 65/7
(iii) 5

(iv) 1/5

5: If  then which of the following is the value of x?

(i) 10
(ii) –10

(iii) -8/5
(iv) 8/5

6: In the sum of two consecutive numbers is 71 and one of them being x, then which of the following is the other number? 

(i) x + (x + 1) = 71
(ii) x + (x + 2) = 71
(iii) x + x = 71
(iv) none of these

7: Two years ago my age was ‘x’ years 5 years ago my age was? 

(i) (x + 7) years
(ii) (x – 2 – 5) years
(iii) (x – 5) years
(iv) (x – 3) years

8: 10 years ago I was ‘x’ years old. After 10 years, my age will be: 

(i) (x + 20) years
(ii) (x – 20) years
(iii) (x + 10) years
(iv) (x –10) years

9: If the difference of two consecutive numbers is 15 and the greater of them is x then the smaller number is: 

(i) 16
(ii) 14
(iii) 8
(iv) 7

10: If ‘x’ is an even number, then which of the following is the next odd number is? 

(i) x + 1
(ii) x + 2
(iii) x – 1
(iv) x – 2

Answers

1. (iii) 

2. (ii) 

3. (i) 

4. (iii) 

5. (i) 

6. (i) 

7. (iv) 

8. (i) 

9. (iv) 

10. (i)