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

Physics - Physics and Measurement
Fundamental and Derived Units, Least Count and Significant Figures

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


1.
In the CGS system, the base units for length, mass and time are respectively:
A.
Metre, gram, second
B.
Centimetre, kilogram, second
C.
Centimetre, gram, second
D.
Foot, gram, second
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ANSWER :
C. Centimetre, gram, second
2.
Which of the following set contains ONLY fundamental (base) quantities in SI?
A.
Length, velocity, mass
B.
Length, mass, time, electric current, temperature, amount of substance, luminous intensity
C.
Force, mass, time
D.
Energy, mass, length
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ANSWER :
B. Length, mass, time, electric current, temperature, amount of substance, luminous intensity
3.
The SI unit of amount of substance is mole. One mole contains exactly:
A.
6.022 × 10²² entities
B.
6.022 × 10²³ entities
C.
6.022 × 10²⁴ entities
D.
9.109 × 10²³ entities
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ANSWER :
B. 6.022 × 10²³ entities
4.
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
5.
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
6.
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
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