In sodium sulphate (Na2SO4), the mass percent of sodium, sulfur and oxygen is:

1. 32.4%, 45.05%, 22.6%

2. 22.6%, 45.05%, 32.4%

3. 32.4%, 22.6%, 45.05%

4. 45.05%, 32.4%, 22.6%

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If the mass of air at sea level is 1034 g cm–2, pressure in pascal will be:

1. 1.01332 × 105 Pa

2. 1.01332 × 106 Pa

3. 1.01332 × 10Pa

4. 1.01332 × 108 Pa

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The SI unit of mass is:

1. Kilogram (kg)

2. Gram (g)

3. Pascal (Pa)

4. Kilometres (km)

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A significant figure is defined as :

 1 The total number of digits in a number, including the last digit that represents the uncertainty of the result. 2 The total number of digits in a number, excluding the last digit, which represents the uncertainty of the result. 3 The total number of digits in a number including the last digit that represents the certainty of the result. 4 The total number of last digits that represents the uncertainty of the result.

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If the speed of light is 3.0 × 108 m s–1, then the distance covered by light in 2.00 nanoseconds will be -

1. 0.500 m

2. 0.600 m

3. 0.700 m

4. 0.800 m

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15.15 pm in the basic unit will be

1. 1.515 × 1012 m

2. 2.57 × 1011 m

3. 2.87 × 1011 m

4. 1.515 × 10–11 m

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The number of significant figures present in the answer of the following calculations [(i), (ii), (iii)]  are respectively -

 1 0 . 02856   ×   298 . 15   × 0 . 112 / 5785 2 5 × 5.364 3 0.0125 + 0.7864 + 0.0215

 1 4, 4, 3 2 3, 3, 4 3 4, 3, 4 4 3, 4, 4

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The correct match is:
 List I List II a. Micro i. ${10}^{-15}$ m b. Mega ii. ${10}^{-6}$ m c. Giga iii. ${10}^{6}$ m d. Femto iv. ${10}^{9}$ m
Codes:
 a b c d 1. i iv iii ii 2. iii iv ii i 3. ii iii iv i 4. i iii iv ii
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The numbers 234,000 and 6.0012 can be represented in scientific notation as:

1.

2. 0.234 $×{10}^{-6}$ and $60012×{10}^{-9}$

3.  $6.0012×{10}^{-9}$

4. 2.34$×{10}^{5}$ and 6.0012$×{10}^{0}$

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The number of significant figures in the numbers 5005, 500.0, and 126,000 are, respectively:

 1 2, 4, and 3 2 4, 1, and 3 3 4, 4, and 6 4 4, 4, and 3
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