Deepak put twenty ice cubes of the same volume into four containers packed inside different materials. He recorded the time taken for the ice to melt in each case. The table shows his results. Which of the boxes should he choose to carry ice that he needs to take to a friend's house 120 km away?
Deepak's Observations

Packing Material Melting

a. thermocol 3 h 10 min

b. paper 2 h 05 min

c. sand 30 min

d. sawdust 1 h 15 min

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Solution

(a) Ice in the thermocol box, takes the longest time to melt. Hence, Deepak should use thermocol material to carry ice to his friend's house.

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Column I	Column II
a. maximum temperature of a city	i. takes up heat
b. ice melts	ii. 3,000,000^∘C
c. temperature of a healthy person	iii. 1600^∘C
d. temperature inside the sun	iv. hot object to cold object
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f. temperature on a cold winter day	vi. measured in the day
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j. temperature of boiling water	x. 6^∘C
	xi. 37^∘C

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