DSSSB TGT CS Mock 04 – Question 007

Question:

A cube of side 6 cm is painted yellow on all faces and cut into smaller cubes of side 1 cm. How many smaller cubes have exactly two faces painted?
6 सेमी भुजा वाले एक घन को सभी फलकों पर पीले रंग से रंगा जाता है और 1 सेमी भुजा वाले छोटे घनों में काटा जाता है। ऐसे कितने छोटे घन हैं जिनके ठीक दो फलक रंगे हुए हैं?

Options:

  • 48
  • 36
  • 24
  • 64
  • 48
  • 36
  • 24
  • 64

Correct Answer: a)

Explanation:

For \(n = 6/1 = 6\), cubes with exactly 2 painted faces lie along the edges (excluding corners).
Formula: \(12 \times (n – 2) = 12 \times (6 – 2) = 12 \times 4 = 48\).
ठीक दो रंगीन फलकों वाले घनों की संख्या = \(12 \times (n – 2) = 12 \times (6 – 2) = 48\)।

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