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Q.

Select the correct statement :

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a

The correct answer for the calculation of0.182 + 124.75 is 124.932

b

The correct answer for the calculation of 1.12 × 0.012231.002 is 0.01367

c

The correct answer the calculation of 1.12 × 10-3×0.21.2 is 0.1866 ×10-3

d

The correct answer for the calculation of  923 x 0.00125 + 201 is 202

answer is D.

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Detailed Solution

Statement (1) is incorrect Correct (1) 0.182 + 124.75 = 124.93 not 124.932 Since 124.75 contains digits upto second place of decimal, therefore the answer mustbe reported to two decimal places.Statement (2) is incorrect Correct (2)1.12 ×0.012231.002=0.001367 = 0.0137In the calculation, the number of significant figures in the term 1.12 is 3. Therefore the result should have 3 significant figurestherefore the correct answer is 0.0137 . The number after 6 is 7 and therefore it is rounded off to 7 Statement(3) is incorrectCorrect(3)1.12 ×10-30.21.2 is 0.1866 × 10-3 = 0.2 × 10-3The answer should have one significant figures because 0.2 has one significant figures. The number after 1 is 8, therefore it is sound off to 2 Statement (4) is correctThe multiplication of first two numbers are as: 923 x 0.00125 = 1.15375 = 1.15In multiplication of significant figures the answer must be reported upto three significant figures, as the number 932 hasthree significant figures. Thus it should be 1.15 Upon addition, final answer is:1.15 + 201 (zero place of decimal)=202.15 = 202(answer must be with zero place of decimal)
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