Fundamental and Derived Units, Least Count and Significant Figures NEET Questions

Physics - Physics and Measurement

Fundamental and Derived Units, Least Count and Significant Figures MCQ Questions


7.
The metre (SI unit of length) is currently defined in terms of:
A.
Wavelength of krypton-86 radiation
B.
Speed of light in vacuum
C.
Distance from equator to North Pole
D.
Platinum-iridium bar kept at Paris
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ANSWER :
B. Speed of light in vacuum
8.
Which of the following is a DERIVED unit in SI?
A.
Ampere
B.
Candela
C.
Newton
D.
Kelvin
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ANSWER :
C. Newton
9.
How many significant figures are there in 0.004560?

NEET - 2019

A.
3
B.
4
C.
5
D.
6
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ANSWER :
C. 5
10.
The kilogram (SI unit of mass) is now defined in terms of:
A.
Mass of 1 litre of water at 4°C
B.
Planck's constant h
C.
Avogadro's number
D.
Speed of light
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ANSWER :
B. Planck's constant h
11.
The second (SI unit of time) is defined using:
A.
Mean solar day
B.
Oscillations of a pendulum of length 1 m
C.
Hyperfine transition of caesium-133 atom
D.
Decay of radioactive carbon
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ANSWER :
C. Hyperfine transition of caesium-133 atom
12.
Which of the following is NOT a derived unit with a special name in SI?
A.
Joule (J)
B.
Newton (N)
C.
Watt (W)
D.
Kilogram (kg)
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ANSWER :
D. Kilogram (kg)