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The MCQs below are drawn from the Physics subject category.
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271
Which instrument is used for measuring very high temperature?
A. Pyrometer
B. Thermmeter
C. Hydrometer
D. Thermometer
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Explanation
A pyrometer is an instrument designed specifically to measure very high temperatures, unlike a thermometer or hydrometer.
272
A moving coil galvanometer is changed into ____ by putting a low resistance in parallel.
A. Resistor
B. Voltmeter
C. An ammeter
D. None of these
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Explanation
Connecting a low shunt resistance in parallel converts a galvanometer into an ammeter capable of measuring larger currents.
273
The length of a string of a simple pendulum is 102.3 cm and the diameter of the bob is 2.58 cm. What is the effective length of the simple pendulum (i.e., the distance between the point of suspension and the centre of gravity of the bob) up to required significant figures?
A. 104.86 cm
B. 104 cm
C. 103.58 cm
D. 103.6 cm
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Explanation
Effective length = string length + radius of bob = 102.3 cm + (2.58/2) cm = 102.3 + 1.29 = 103.59 ≈ 103.6 cm to proper significant figures.
274
Theodolite is an instrument used by
A. Navigators
B. Cartographers
C. Surveyors
D. Pilots
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Explanation
A theodolite is commonly used by surveyors for measuring horizontal and vertical angles.
275
The sensitivity of the galvanometer can be increased by increasing the
A. number of turns of the coil
B. area of the coil
C. strength of the magnetic field
D. all of the above
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Explanation
Increasing coil turns, coil area, or magnetic field strength all increase torque for a given current, so all three improve sensitivity (option D).
276
Thermostat is used to
A. Measure temperature
B. Measure illness
C. Measure heat
D. Measure coldness
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Explanation
A thermostat is used to sense and regulate temperature.
277
A chronometer measures:
A. Time
B. Water waves
C. Color contrast
D. Sound waves
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Explanation
A chronometer is an instrument for measuring time; the OCR shows a marker by option B.
278
Richter scale is used for measuring
A. Humidity of air
B. Intensity of earthquake
C. Density of liquid
D. Velocity of wind
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Explanation
The Richter scale quantifies the magnitude (intensity) of earthquakes.
279
A spring scale is calibrated in newtons and is used to weigh sugar. If it were possible to weigh sugar at the following locations, the buyer will get the most sugar in newtons at:
A. at the equator
B. at the north pole
C. at the center of the earth
D. on the moon
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Explanation
Apparent weight is greatest at the poles because centrifugal effects are minimal and local g is slightly higher than at the equator.
280
Who invented the first closed-tube thermometer in 1713?
A. Max. Planck
B. Galileo
C. Gabriel Fahrenheit
D. Newton
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Explanation
Daniel Gabriel Fahrenheit developed the mercury thermometer around that period, making him the inventor of the closed-tube thermometer.
