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The MCQs below are drawn from the Physics subject category.
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251
Which of the following measures how quickly the thermometer can register change in temperature?
A. Sensitivity
B. Design feature
C. Range
D. Responsiveness
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Explanation
Responsiveness refers to how quickly a thermometer registers changes in temperature.
252
Most meter movements give full scale deflection with a current of:
A. A few mA only
B. A few amperes only
C. All are true
D. A few pA only
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Explanation
Typical meter movements are sufficiently sensitive that full-scale deflection requires currents on the order of milliamperes.
253
The device used for the measurement of liquid flow is:
A. Manometer
B. Venturimeter
C. Barometer
D. Hydrometer
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Explanation
A venturi meter is a device specifically used to measure fluid flow rate in pipes.
254
Which instrument is expensive and difficult to use?
A. Voltmeter
B. Potentiometer
C. CRO
D. Both (B) and (C)
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Explanation
Potentiometers and cathode ray oscilloscopes (CRO) are generally more expensive and require greater skill to operate than simple voltmeters.
255
An ammeter can be converted into a voltmeter by connecting
A. a high resistance in parallel
B. a low resistance in parallel
C. an ammeter
D. a low resistance in series
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Explanation
To use an ammeter as a voltmeter you place a high resistance in series; among given choices the intended correct description is adding resistance in series (option A interpreted as series low was OCR-corrupted but context requires series resistance).
256
To increase the sensitiveness of a moving coil galvanometer one may
A. decrease the number of turns in the coil
B. increase the strength of current
C. increase the area of the coil
D. decrease the area of the coil
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Explanation
Sensitivity is proportional to BAN, so increasing the coil area increases sensitivity (also increasing turns or magnetic field would help).
257
To convert a moving coil galvanometer into an ammeter one has to connect
A. a high resistance in series
B. a high resistance in parallel
C. a small resistance in series
D. a small resistance in parallel
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Explanation
A galvanometer is converted into an ammeter by connecting a low resistance (shunt) in parallel so most current bypasses the coil.
258
The sensitivity of a galvanometer depends on ____.
A. Number of the turns
B. Room temperature
C. Current flow
D. None of these
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Explanation
Galvanometer sensitivity increases with the number of coil turns (and with coil area and magnetic field strength).
259
The instrument used for measuring purity of milk is
A. Hydrometer
B. Lactometer
C. Algestimeter
D. None of these
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Explanation
A lactometer measures the density (specific gravity) of milk and is used to assess its purity.
260
Bolometer is used to measure
A. Radiant energy
B. Purity of milk
C. Specific gravity
D. None of these
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Explanation
A bolometer measures the power of incident electromagnetic radiation, i.e., radiant energy.
