General Principles in the Working of Hydrometer NDA Questions

NDA Physics

General Principles in the Working of Hydrometer MCQ Questions


13.
The bulb of the hydrometer is typically filled with
A.
Water
B.
Mercury
C.
Air
D.
Lead shot
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ANSWER :
D. Lead shot
14.
Which of the following describes the role of buoyancy in hydrometer function?
A.
It determines the depth of submersion
B.
It affects the color of the liquid
C.
It changes the viscosity
D.
It measures the volume of liquid
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ANSWER :
A. It determines the depth of submersion
15.
A hydrometer for measuring the density of alcohol is called a
A.
Lactometer
B.
Saccharometer
C.
Alcoholmeter
D.
Acidometer
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ANSWER :
C. Alcoholmeter
16.
What happens to a hydrometer when placed in a denser liquid?
A.
It floats higher
B.
It floats lower
C.
It submerges completely
D.
It stays at the same level
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ANSWER :
A. It floats higher
17.
The reference point for hydrometer calibration is usually
A.
Water at 4°C
B.
Water at 25°C
C.
Alcohol at room temperature
D.
Oil at boiling point
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ANSWER :
A. Water at 4°C
18.
The higher the density of the liquid, the hydrometer will
A.
Float lower
B.
Sink more
C.
Float higher
D.
Tilt to one side
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ANSWER :
C. Float higher