1. Which of the following is a base unit?




... Answer is D. mole
A base unit is a unit adapted to measure a base quantity. The System of International (SI) consists of seven base units including metre, kilogram, second, ampere, Kelvin, mole, and candela (The units of the Base Quantity length, mass, time, electric current, temperature, amount of substance, and luminous intensity respectively).


2. Ratio of millimetre to micrometre is




... Answer is C. 1000 
 Millimetre = 10⁻³ m and micrometer = 10⁻⁶ m, so `\frac {10⁻³ m}{10⁻⁶ m }` = 10⁻³⁺⁶ m = 10³ m = 1000


3. Which of the following prefixes represents the largest value?




... Answer is C. peta
Pico = 10⁻¹², Kilo =10³ , Mega = 10⁶, and Peta = 10¹⁵


4. Which of the following quantity can be measured using a micrometer?




... Answer is C. length
Micrometer Screw gauge measures the length


5.  The instrument best measures the internal diameter of a pipe is




... Answer is B. vernier caliper
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6. Lest count of the screw gauge is 0.01 mm. If the main scale reading of the screw gauge is zero and the third line of its circular scale coincides with the datum line then the measurement on the screw gauge is:




... Answer is C. 0.03 mm
Main scale reading + Vernier scale reading X least count = 0 + 3 x 0.01 mm = 0.03 mm


7. 9.483 x 10³ m is the standard form of :




... Answer is D. 9483 m
9.483 x 10³ m = 9.483 x 1000 m = 9483 m


8. How many significant figures are in 0.00350 s?




... Answer is B. 3
When the figure is less than 1, Zero after a decimal point that comes before non-zero digits are not significant


9. Which of the following numbers shows one significant digit?




... Answer is D. 6 ｘ 10²
When the figure is written in scientific notation then the 10 exponents in not count as significant. So 6 ｘ 10² has one significant digit


10. Which of the following numbers shows 4 significant digits?




... Answer is A. 900.8
 Option A., C., and D are all having 4 significant figures (S.F). Any one of A., C, and D. can be selected. If we were asked that NOT show 4 S.F. then our answer will be option B. 4 (having 1 S.F)


11. 0.2 mm in units of metres is




... Answer is A. 0.0002 m
Milli = 10⁻³


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