Class 7 Bar Graphs — practice questions with answers
Data Handling · 5 sample questions from the school syllabus. Try each one, then open the answer and the worked solution.
1. In a bar graph, the lengths (or heights) of the bars represent the ______ of the data.
Afrequency or value
Bnames of items
Ccolour
Dwidth of bars
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Answer: A) frequency or value
In a bar graph all bars have equal width; the length/height of each bar shows the value or frequency of that item.
2. A bar graph of marks shows Aman 45 and Kiran 30. How many more marks did Aman score than Kiran?
A30
B16
C15
D14
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Answer: C) 15
Difference = 45 - 30 = 15 marks.
3. A double bar graph shows runs by Virat and Rohit in 3 matches. Virat: 50, 80, 70. Rohit: 40, 60, 90. Who scored more runs in total, and by how much?
4. A bar graph shows electricity bills (in ₹) of a family: Jan 800, Feb 600, Mar 1000, Apr 1200. The family wants the April bar to be exactly 8 cm tall. What scale (1 cm = ₹ ___ ) should they use, and how tall will the January bar be?
A1 cm = ₹150; Jan bar = 316 cm ≈ 5.33 cm
B1 cm = ₹150; Jan bar = 8 cm
C1 cm = ₹100; Jan bar = 8 cm
D1 cm = ₹200; Jan bar = 4 cm
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Answer: A) 1 cm = ₹150; Jan bar = 316 cm ≈ 5.33 cm
For April (₹1200) to be 8 cm: scale = 1200/8 = ₹150 per cm. Jan (₹800) height = 800/150 = 316 ≈ 5.33 cm.
5. A bar graph of a canteen's earnings (in ₹) over 5 days has an average of ₹520 per day. The bars for Mon, Tue, Wed, Thu are ₹480, ₹500, ₹560, ₹510. The owner claims Friday earned more than ₹600. Is the claim correct, and what was Friday's earning?
ANo; Friday earned ₹550
BYes; Friday earned ₹650
CNo; Friday earned ₹500
DYes; Friday earned ₹620
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Answer: A) No; Friday earned ₹550
Total for 5 days = 520 x 5 = ₹2600. Mon-Thu = 480+500+560+510 = ₹2050. Friday = 2600 - 2050 = ₹550, which is NOT more than ₹600, so the claim is false.