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1.

The number of zeros before the first significant digit of `1/3125` is `"________"`.A. 1B. 2C. 3D. 4

Answer» Correct Answer - C
Convert the fraction into decimal and proceed.
Discussion
2.

After simplification, numbers of zeroes before first significant digit of `(0.03125/25)` is `"_______"`.A. 4B. 3C. 2D. 1

Answer» Correct Answer - C
`0.03125/25 = 0.00125`
Number of zeroes = 2.
Discussion
3.

The length of object measured to the nearest centimetre is 120 cm. If the length is expressed in mm, then the number of significant figures isA. 4B. 2C. 3D. 5

Answer» Correct Answer - C
There is no change in the number os significant figures in a measurement, even if it is changed form one system to another system.
Discussion
4.

The height of a person is `6.0` ft, correct to nearest foot (in integer) then number of significant figures is `"________"`.A. 2B. 1C. 3D. cannot be determined

Answer» Correct Answer - B
The height of a person is `6.0` ft.
When it is corrected to nearest ft, the height is 6 ft.
`:.` Number of significant digit is 1.
Discussion
5.

The ratio of absolute error to the exact value is `"_______"`.

Answer» Correct Answer - relative error
Discussion
6.

81.75 when expressed, correct to the nearest integer would be `"_________"`.

Answer» Correct Answer - 82
Discussion
7.

After simplification, the first significant digit of the fraction `0.12345/125` is `"______"`.A. 6B. 7C. 8D. 9

Answer» Correct Answer - D
Discussion
8.

The unit of measurement is one hundredth of 1 cm. If the measure is 0.09 cm, the number of significant figures is `"__________"` .A. 1B. 2C. 3D. 4

Answer» Correct Answer - A
Discussion
9.

1638 is approximated to the nearest hundred. Absolute error = `"____"`.

Answer» Correct Answer - 38
Discussion
10.

Find the sum of the significant digits fo the LCM of `0.12, 0.18 and 0.24`.A. 7B. 8C. 6D. 9

Answer» Correct Answer - D
(1) Apply the concept of LCM of decimals and then find the requird sum. ,
(ii) Write the significant digits of three numbers.
(iii) Find the LCM.
(iv) Add the sum of the digits of the number obtained by the LCM.
Discussion
11.

If there are three significant digits in `0.abc`, then what are the possible values of a, b and c?A. `a lt 10, b ne0 and c ne 0`B. `a = 0, b= 0 and 0 ltc lt 10`C. Cantnot be determinedD. None of these

Answer» Correct Answer - C
Check from the options.
Discussion
12.

Evaluate `15/(sqrt 2-1)` correct to four significant digits (Take `sqrt2 = 1.414`).A. `32.63`B. `32.36`C. `36.23`D. `36.32`

Answer» Correct Answer - C
`15/(sqrt2-1 )=15(sqrt2+1)/((sqrt2-1)(sqrt2+1))=(15(sqrt2+1))/(2-1)`
= `15(1.414+) = 36.23`
Discussion
13.

The value of `sqrt115` corrected to four significant figures is `"_________"`A. `10.72`B. `10.73`C. 10.74`D. `10.75`

Answer» Correct Answer - A
Find `sqrt115` by division method.
Discussion
14.

Find the sum `0.23 + 0.234 + 0.2345` corrected to three significant figures.A. `0.697`B. `0.677`C. `0.699`D. `0.688`

Answer» Correct Answer - C
(i) Add the given decimals and correct the sum to three significant figures.
(ii) Round off to 3 significant figures after adding the numbers.
Discussion