1) In which of the following pairs of numbers does each member of the pair conta

Question

1) In which of the following pairs of numbers does each member of the pair contain the same number of B) 0.05700 and 0.0570 C) 39 and 3090 2) A rubber band is found to weigh 0.0978 & What is the total mass of 106 such identical rubber bands? significant figures? A) 5010 and 0.09871 D) 9900.0 and 60.01 E) 0.0000606 and 660,000 A) 10.0g B) 10g C)10.28 g 0)103E) none of these 3) Which one of the following mathematical expressions is not evaluated correctly? c 10/n0-10 10 E) All are correct 4) Which of the following conversion factors is needed to solve the problem "3.25 kg-?g" using dimensional analysis? A). 1 kg/10' g B) 10' g/1 kg C) 1 mg/10 g D) no correct response 5) Which of the following is a correct statement about mixtures? A) The composition of a homogeneous mixture cannot vary B). A heterogeneous mibxture must contain at least three substances C) All heterogeneous mixtures have a non-uniform appearance. D) No correct response

Explanation / Answer

1. option A is right.

we dont coun the zero after decimal as significant number. SO, 5010 and 0.09871 have the same significant number, which is 4

2. The weight of 106 is 106*0.0978 = 10.3668

the 106 have three significant number and 0.0978 has three significant number, so the multiplication will have three significant number

thbut more precisely after rounding off the ans would be 10.4g

So the ans is option E.

3. option D is right

10-3/10-6 = 1/103/1/106 = 106/103= 103

4. option B is right

5. option C is right

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