Class VII – Unit Test-1: Maths

 📝 Class VII – Unit Test-1: Maths (Corrected + Rechecked Answers with Explanation)


Total Marks: 20 | Time: 1 hr



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1. What is the additive inverse of -10? (1 mark)

✅ Answer: +10

🧒 समझाओ: -10 में अगर +10 जोड़ दो तो हो जाएगा 0।

👉 इसलिए +10 ही उसका उल्टा (additive inverse) है।



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2. Find mean of first 5 whole numbers. (1 mark)

✅ Whole numbers: 0, 1, 2, 3, 4

👉 Mean = (0 + 1 + 2 + 3 + 4) ÷ 5 = 10 ÷ 5 = 2

🧒 मतलब: 5 बच्चों ने मिलकर 10 बिस्कुट खाए, सबको बराबर देने के लिए हर एक को 2 बिस्कुट।



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3. What is the result of multiplying two negative integers? (1 mark)

✅ Answer: Positive integer

🧒 समझाओ: Negative × Negative = Positive

जैसे (–2) × (–3) = +6



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4. What is the mean of the first 5 natural numbers? (1 mark)

✅ Natural numbers: 1, 2, 3, 4, 5

👉 Mean = (1 + 2 + 3 + 4 + 5) ÷ 5 = 15 ÷ 5 = 3

🧒 यानी: 5 बच्चों ने मिलकर 15 आम खाए, हर बच्चे को 3 आम मिले।



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5. Find the value of: (–15) + 20 (2 marks)

✅ Answer: 5

🧒 समझाओ: 15 रुपए उधार थे, अब 20 रुपए मिल गए।

👉 तो 15 उधार चुका कर 5 बच गए।



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6. Subtract: –8 from 12 (2 marks)

✅ Question है: 12 – (–8)

👉 12 – (–8) = 12 + 8 = 20

🧒 बच्चे की भाषा में: माइनस माइनस मिलकर प्लस बनता है।



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7. Find the mode of the following data: 2, 4, 2, 3, 2, 5 (2 marks)

✅ बार-बार आने वाला नंबर: 2

👉 2 तीन बार आया, बाकी सब कम बार।

🧒 Mode मतलब: जो सबसे ज़्यादा बार आया हो।



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8. Find the value of: (–25) ÷ 5 (2 marks)

✅ Answer: –5

👉 (–25) ÷ 5 = –5

🧒 Negative ÷ Positive = Negative

बिल्कुल ऐसे जैसे: उधारी के 25 रुपए को 5 दोस्तों में बाँटा।



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9. Median of: 3, 5, 2, 4, 6 (2 marks)

✅ Step 1: Arrange: 2, 3, 4, 5, 6

👉 Middle value = 4

🧒 समझाओ: लाइन में खड़ा करो, बीच वाला बच्चा जो है वही median।



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10. Temp drops 5°C every hour. Start = 20°C. After 4 hrs? (4 marks)

✅ Drop in 4 hours = 5 × 4 = 20°C

👉 Final Temp = 20 – 20 = 0°C

🧒 बिलकुल जैसे: 20 गोलगप्पे थे, हर घंटे 5 खाए — 4 घंटे में सब खत्म! यानी तापमान 0°C



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🎯 Final Correct Answers Recap:


Q.No Answer


1 +10

2 2

3 Positive

4 3

5 5

6 20

7 2

8 -5

9 4

10 0°C

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