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


7.
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
8.
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)
9.
The dimensional formula of the derived unit Pascal (Pa) is:
A.
[MLT⁻²]
B.
[ML²T⁻²]
C.
[ML⁻¹T⁻²]
D.
[MLT⁻¹]
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ANSWER :
C. [ML⁻¹T⁻²]
10.
Which pair of SI base units is used to derive the unit of velocity?
A.
Kilogram and second
B.
Metre and second
C.
Metre and kilogram
D.
Ampere and second
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ANSWER :
B. Metre and second
11.
In FPS system, the units of force is 'poundal'. Its dimensional formula is same as SI unit:
A.
Joule
B.
Newton
C.
Pascal
D.
Watt
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ANSWER :
B. Newton
12.
The unit 'litre' is NOT an SI unit but is retained for general use. 1 litre is equal to:
A.
1 m³
B.
10⁻³ m³
C.
10⁻² m³
D.
10⁻⁶ m³
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ANSWER :
B. 10⁻³ m³
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