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MathematicsMensuration
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A solid metallic cube of side 6 cm is melted and recast into smaller cubes of side 2 cm. How many such smaller cubes can be made?

A

9

B

18

C

27

D

36

Correct Answer

ЁЯУР MA тАв Math Concept & PrincipleMathematicsMensuration
Option C

27

Quick Summary:

When a solid object is melted and recast into smaller objects of the same material, the total volume remains conserved. The number of smaller cubes is obtained by dividing the volume of the larger cube by the volume of one smaller cube.

ЁЯФмSCScience SolutionConcept & Principle
ЁЯТб Explanation

When a solid object is melted and recast into smaller objects of the same material, the total volume remains conserved. The number of smaller cubes is obtained by dividing the volume of the larger cube by the volume of one smaller cube.

ЁЯТб Everyday Analogy (Real-World Intuition)

Imagine melting a large block of ice of volume 216 cubic centimeters and pouring the water into smaller ice cube trays each holding 8 cubic centimeters; you will be able to fill exactly 27 small trays.

ЁЯза Memory Mnemonic / Shortcut Aid

Large Volume divided by Small Volume gives the count!

ЁЯФв Key Formulas

V=a3V = a^3V=a3 тАФ Volume of a cube with side length aaa

n=VlargeVsmalln = \frac{V_{\text{large}}}{V_{\text{small}}}n=VsmallтАЛVlargeтАЛтАЛ тАФ Number of smaller cubes formed

тЪЩя╕П Working Principle

According to the principle of conservation of mass and volume in melting and casting processes, the volume of the original metal equals the sum of the volumes of all the recast items. The volume of a cube is given by V=a3V = a^3V=a3, where aaa is the side length. Thus, the ratio of volumes gives n=VlargeVsmall=6323=2168=27n = \frac{V_{\text{large}}}{V_{\text{small}}} = \frac{6^3}{2^3} = \frac{216}{8} = 27n=VsmallтАЛVlargeтАЛтАЛ=2363тАЛ=8216тАЛ=27.

ЁЯУМ Key Points
  • тЦ╕

    Volume remains constant during melting and recasting (neglecting negligible losses).

  • тЦ╕

    The side length of the large cube is 6 cm, making its volume 216extcm3216 ext{ cm}^3216extcm3.

  • тЦ╕

    The side length of each small cube is 2 cm, making its volume 8extcm38 ext{ cm}^38extcm3.

тЬЕ Advantages
  • тЦ╕

    Quick computation using volume ratios rather than direct drawing or complex modeling.

тЭМ Disadvantages / Limitations
  • тЦ╕

    Assumes 100% material efficiency without any melting waste or dross formation.

ЁЯЫая╕П Applications / Uses
  • тЦ╕

    Foundry work and metal casting industries

  • тЦ╕

    Manufacturing identical components from bulk stock material

ЁЯУД Additional Information
  • тЦ╕

    Density of the metallic material remains unchanged during the phase change and recasting.

  • тЦ╕

    Option A (9), Option B (18), and Option D (36) arise from incorrect exponent calculations or improper surface-to-volume ratio misunderstandings.

ЁЯУК Diagram / Illustration
Cube Melting & Recasting Calculation1Given Data: Large Cube & Small Cube DimensionsLarge Cube side (a) = 6 cm | Small Cube side (a) = 2 cm2Formula: Volume Conservation PrincipleVolume of a Cube: V = a┬│, Number of cubes (n) = V(large) / V(small)3Substitution & Calculationn = (6┬│) / (2┬│) = 216 / 8 = 27 smaller cubes4Final ResultTotal Number of Recast Cubes = 27Correct Option: C) 27
тЬЕ

C is correct тАФ 27 smaller cubes of side 2 cm can be made from a solid metallic cube of side 6 cm due to the conservation of volume.

Core Concepts Used
Click any tag to open in AI Tutor
Volume Conservation Cube Geometry Ratio and Proportion
ЁЯТб EXAM TIP

Always verify whether the problem asks for linear dimensions, surface areas, or volumes, as scaling factors differ (aaa for linear, a2a^2a2 for area, and a3a^3a3 for volume).

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