20 cm, 12 cm और 10 cm विमाओं वाले एक घनाभ को 3 कटों द्वारा 8 समान टुकड़ों में काटा जाता है। सभी टुकड़ों का कुल पृष्ठीय क्षेत्रफल कितनी होगा?

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SSC CHSL Exam 2024 Tier-I Official Paper (Held On: 10 Jul, 2024 Shift 3)
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  1. 1220 cm2
  2. 2240 cm2
  3. 3360 cm2
  4. 1680 cm2

Answer (Detailed Solution Below)

Option 2 : 2240 cm2
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दिया गया:

लम्बाई (एल) = 20 cm

चौड़ाई (बी) = 12 cm

ऊँचाई (H) = 10 cm

घनाभ को 8 समान टुकड़ों में काटा गया है।

प्रयुक्त सूत्र:

घनाभ का पृष्ठीय क्षेत्रफल = 2(L × B + L × H + B × H)

प्रत्येक टुकड़े का पृष्ठीय क्षेत्रफल = 2(L/2 × B/2 + L/2 × H/2 + B/2 × H/2)

गणना:

घनाभ का पृष्ठीय क्षेत्रफल = 2(20 × 12 + 20 × 10 + 12 × 10)

⇒ 2(240 + 200 + 120)

⇒ 2 × 560 = 1120 cm2 (मूल घनाभ का पृष्ठीय क्षेत्रफल)

एक छोटे टुकड़े का पृष्ठीय क्षेत्रफल = 2(10 × 6 + 10 × 5 + 6 × 5)

⇒ 2(60 + 50 + 30)

⇒ 2 × 140 = 280 cm2 (एक छोटे घनाभ का पृष्ठीय क्षेत्रफल)

8 टुकड़ों का कुल पृष्ठीय क्षेत्रफल = 8 × 280

⇒ कुल पृष्ठीय क्षेत्रफल = 2240 cm2

∴ सही उत्तर विकल्प (2) है।

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