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| Maths Quiz for Class 7 Ratio and Proportion |
In this post, you will find 20 online maths quiz questions for class 7 ratio and proportion. Online maths quiz will take around 20 minutes to complete it.
Question 1: The ratio of 5 m to 50 cm is ____________.
A) 1 : 1
B) 5 : 1
C) 10 : 1
D) 1 : 10
Explanation: The ratio of 5 m to 50 cm = 5 m : 50 cm = 5 × 100 cm : 50 cm = 500 : 50 = 10 : 1
Question 2: The ratio of 350 g to 2 kg is _____________.
A) 7 : 40
B) 40 : 7
C) 350 : 2
D) 7 : 4
Explanation: The ratio of 350 g to 2 kg = 350 g : 2 kg = 350 g : 2 × 1000 g = 350 : 2000 = 7 : 40
Question 3: If you divide ₹ 1000 among A, B and C in the ratio 5 : 2 : 3, then the share of A is ___________.
A) ₹ 500
B) ₹ 300
C) ₹ 200
D) ₹ 700
Explanation: Sum of the terms of the ratio = 5 + 2 + 3 = 10. Share of A = 5/10 × ₹ 1000 = ₹ 500
Question 4: If A : B = 4 : 3 and B : C = 6 : 5, then A : C = ____________.
A) 4 : 5
B) 8 : 5
C) 8 : 6
D) 5 : 8
Explanation: A : B = 4 : 3 and B : C = 6 : 5 => A : B = 4 × 2 : 3 × 2 and B : C = 6 : 5 => A : B = 8 : 6 and B : C = 6 : 5 => A : C = 8 : 5
Question 5: Which of the following ratios is equivalent to 3 : 7?
A) 6 : 7
B) 9 : 21
C) 9 : 14
D) 6 : 21
Explanation: 3 : 7 = 3 × 3 : 7 × 3 = 9 : 21
Question 6: The simplest form of the ratio 45 : 81 is ____________.
A) 10 : 9
B) 15 : 9
C) 5 : 9
D) 9 : 5
Explanation: 45 : 81 = 45 ÷ 9 : 81 ÷ 9 = 5 : 9
Question 7: If A : B = 1 : 2 and B : C = 4 : 3, then the ratio of A, B and C is _________.
A) 4 : 2 : 3
B) 2 : 4 : 3
C) 2 : 3 : 4
D) 3 : 4 : 2
Explanation: A : B = 1 : 2 and B : C = 4 : 3 => A : B = 1 × 2 : 2 × 2 and B : C = 4 : 3 => A : B = 2 : 4 and B : C = 4 : 3 => A : B : C = 2 : 4 : 3
Question 8: The angles of a triangle are in the ratio 5 : 6 : 7. The smallest angle of the triangle is ___________.
A) 40°
B) 70°
C) 60°
D) 50°
Explanation: Let the angles be 5x, 6x and 7x. Then 5x + 6x + 7x = 180° => 18x = 180° = x = 10°. Smallest angle = 5x = 5 × 10° = 50°
Question 9: Which of the following numbers are in proportion?
A) 3, 5, 9, 15
B) 2, 4, 6, 9
C) 5, 7, 15, 14
D) 4, 9, 16, 27
Explanation: 3, 5, 9, 15 are in proportion because 3 × 15 = 5 × 9
Question 10: Which of the following ratios are not equivalent?
A) 4 : 7 and 12 : 21
B) 5 : 9 and 20 : 36
C) 2 : 8 and 3 : 9
D) 3 : 15 and 1 : 5
Explanation: 2 : 8 and 3 : 9 are not equivalent because 2 : 8 = 1 : 4 and 3 : 9 = 1 : 3
Question 11: If a, b, c and d are in proportion, then which of the following is correct?
A) ab = cd
B) ad = bc
C) a/b = c/d
D) a/d = b/c
Explanation: If a, b, c and d are in proportion, then the product of extremes = product of means => ad = bc
Question 12: Find the value of x if x : 8 :: 30 : 48.
A) x = 6
B) x = 5
C) x = 7
D) x = 8
Explanation: x : 8 :: 30 : 48 => product of extremes = product of means => 48x = 240 => x = 5
Question 13: If 3 : 5 :: x : 25, then find the value of x.
A) x = 15
B) x = 16
C) x = 14
D) x = 12
Explanation: 3 : 5 :: x : 25 => product of extremes = product of means => 5x = 75 => x = 15
Question 14: If 7 : x :: 28 : 36, then the value of x is ____________.
A) x = 6
B) x = 7
C) x = 8
D) x = 9
Explanation: 7 : x :: 28 : 36 => product of extremes = product of means => 28x = 252 => x = 9
Question 15: If 4 : 9 :: 12 : x, then the value of x is ____________.
A) x = 36
B) x = 18
C) x = 27
D) x = 21
Explanation: 4 : 9 :: 12 : x => product of extremes = product of means => 4x = 108 => x = 27
Question 16: The cost of 8 pens is ₹ 96. Find the cost of a dozen pens.
A) ₹ 124
B) ₹ 144
C) ₹ 140
D) ₹ 148
Explanation: The cost of 8 pens is ₹ 96. Then the cost of 1 pen is ₹ 96/8 = ₹ 12. The cost of a dozen pens, that is, 12 pens is ₹ 12 × 12 = ₹ 144.
Question 17: Nisha can type 450 words in 15 minutes. How many words will she type in 5 minutes?
A) 150 words
B) 100 words
C) 250 words
D) 200 words
Explanation: Nisha can type 450 words in 15 minutes. She can type 450/15 words, that is, 30 words in 1 minute. Nisha can type 30 × 5 words, that is, 150 words in 5 minutes.
Question 18: A car can travel 90 km in 6 L of petrol. How much distance will the car cover using 8 L of petrol?
A) 140 km
B) 130 km
C) 120 km
D) 110 km
Explanation: A car can travel 90 km in 6 L of petrol. Distance travelled by the car in 1 L of petrol = 90/6 = 15 km. Distance travelled by the car in 8 L of petrol = 15 × 8 = 120 km
Question 19: The cost of 7 notebooks is ₹ 420. Find the cost of 12 such notebooks.
A) ₹ 710
B) ₹ 720
C) ₹ 730
D) ₹ 740
Explanation: The cost of 7 notebooks is ₹ 420. The cost of 1 notebook = ₹ 420/7 = ₹ 60. The cost of 12 notebooks = ₹ 60 × 12 = ₹ 720.
Question 20: The measure of 15 gallons of oil is 375 L. Find the measure of 25 gallons of oil.
A) 425 L
B) 525 L
C) 625 L
D) 725 L
Explanation: The measure of 15 gallons of oil is 375 L. The measure of 1 gallon of oil = 375/15 = 25 L. The measure of 25 gallons of oil = 25 × 25 L = 625 L.
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