Q1 of 14 Page 119

Questions and their alternative answers are given. Choose the correct alternative answer.

The side of a cube is 4 m. If it is doubled, how many times will be the volume of the new cube, as compared with the original cube?


We know that the volume of a cube is, where a is the length of it’s edge.


It is given that the length of the edge of the cube is 4m.


The volume of the old cube = Vold = 43


Vold = 43


Now the length of the edge is doubled, i.e. the length of edge of the new cube is 8m.


The volume of the new cube = Vnew = 83


Vnew = 512




The volume of a new cube is 8 times the volume of an old cube.

More from this chapter

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1

Questions and their alternative answers are given. Choose the correct alternative answer.

Find the circumference of a circle whose area is 1386 cm2.


 2

Pranalee was practising for a 100 m running race. She ran 100 m distance 20 times. The time required, in seconds, for each attempt was as follows.

18 , 17 , 17 , 16 , 15 , 16 , 15 , 14 , 16 , 15 ,15 , 17 , 15 , 16, 15 , 17 , 16 , 15 , 14 , 15 Find the mean of the times taken for running.


 3

∆DEF and ∆LMN are congruent in the correspondence EDF ↔ LMN. Write the pairs of congruent sides and congruent angles in the correspondence.

 4

The cost of a machine is ₹ 2,50,000. It depreciates at the rate of 4% per annum. Find the cost of the machine after three years.