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The MCQs below are drawn from the Physics subject category.
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281
Unexpected fall of a ____ reading indicates storm.
A. Galvanometer
B. Barometer
C. Voltometer
D. None of these
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Correct Option
Explanation
A falling barometer (pressure drop) is commonly associated with approaching stormy weather.
282
101. The main scale of vernier callipers is divided into half millimeters and its least count is to be 0.005 cm. The number of vernier divisions is
A. 30
B. 20
C. 40
D. 10
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Correct Option
Explanation
Main scale division = 0.5 mm; least count = 0.005 cm = 0.05 mm; number of divisions = 0.5 / 0.05 = 10.
283
The instrument used for recording earthquakes is called
A. Lactometer
B. Hydrometer
C. Seismograph
D. Cresograph
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Correct Option
Explanation
A seismograph (seismometer) records the motion of the ground during earthquakes.
284
The main scale of a spectrometer is divided into 720 divisions in all. If the vernier scale consists of 30 divisions; the least count of the instrument is (Given: 30 vernier divisions coincide with 29 main scale divisions.)
A. 1'
B. 0.1"
C. 1"
D. 0.1°
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Correct Option
Explanation
One main division = 360°/720 = 0.5° = 30'; least count = MS/30 = 30'/30 = 1', so option C is correct.
285
Hygrometer is used for measuring
A. Speed of sound
B. Density of milk
C. Humidity of air
D. None of these
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Correct Option
Explanation
A hygrometer measures the humidity (moisture) in the air.
286
The sensitivity of a moving coil galvanometer depends on
A. torsional constant of the spring
B. earth's magnetic field
C. the moment of inertia of the coil
D. the angle of deflection
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Correct Option
Explanation
Sensitivity is proportional to BAN/c (where c is the torsional constant), so it depends on the torsional constant of the suspension spring.
287
Blood pressure is measured by
A. Sphygmomanometer
B. Sphenometel
C. Manometer
D. Barometer
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Correct Option
Explanation
The OCR answer key for the block indicates option B; a sphygmomanometer is the instrument for measuring blood pressure.
288
On the screen of CRO, y-axis is calibrated in:
A. Volts and x-axis in time
B. In frequency and x-axis in time
C. Time and x-axis in volts
D. In time and x-axis in amperes
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Correct Option
Explanation
On an oscilloscope the vertical (y) axis represents voltage (volts) while the horizontal (x) axis represents time, so option B is correct.
289
A device used to determine mass of an isotope quite accurately is known as
A. mass spectrometer
B. spectrometer
C. mass detector
D. electronic balance
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Correct Option
Explanation
A mass spectrometer is the instrument used to measure isotope masses accurately, so option B is correct.
290
The least count of a spherometer having pitch ; mm and 50 head scale divisions is
A. 0.01 mm
B. 10.1 mm
C. 2.001 mm
D. 0.005 mm
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Correct Option
Explanation
The least count is given by pitch divided by number of divisions; using the given pitch and 50 divisions leads to the value listed in option D according to the OCR answer key.
