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The MCQs below are drawn from the Current Affairs subject category.
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64971
Resistivity of a semiconductor depends on
A. atomic nature of semiconductor
B. shape of semiconductor
C. shape and atomic nature of semiconductor
D. length of semiconductor
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Correct Option
Explanation
Resistivity is an intrinsic material property determined by atomic structure and impurities, not by macroscopic shape or length.
64972
A resistor whose resistance decreases with increasing intensity is
A. thermistor
B. light dependent resistor
C. strain gauge
D. thermocouple
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Correct Option
Explanation
A light dependent resistor (LDR) decreases its resistance as light intensity increases.
64973
A heat sensitive resistor is called
A. variable resistor
B. thermistor
C. fixed resistor
D. zero resistor
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Correct Option
Explanation
A thermistor is a resistor whose resistance changes with temperature, so option A is correct.
64974
The current in a triode at anode potential 100 V and grid potential -1.2 V is 7.5 mA. If grid potential is changed to -2.2 V, the current becomes 5.5 mA. The value of transconductance (g_m) will be
A. 2 mA/V
B. 4 mA/V
C. 0.2 mA/V
D. 3 mA/V
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Correct Option
Explanation
g_m = ΔI / ΔV = (7.5−5.5) mA / (−1.2−(−2.2)) V = 2 mA / 1 V = 2 mA/V.
64975
The first superconductor was discovered in
A. 1923
B. 1917
C. 1911
D. 1905
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Correct Option
Explanation
Superconductivity was discovered by Heike Kamerlingh Onnes in 1911, so 1911 is the correct year.
64976
The superconductors which will be common in use are at:
A. 163 K
B. 77 K
C. Room temperature
D. 125 K
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Correct Option
Explanation
The header indicates option A as the correct choice; this reflects the idea that room-temperature superconductors would be common in use.
64977
A device used to measure the strain of an object and it is a type of resistor that changes value with applied strain is a
A. strain gauge
B. thermocouple
C. potentiometer
D. thermistor
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Correct Option
Explanation
A strain gauge is a resistor whose resistance changes with applied strain, so it is the device described.
64978
CRO means:
A. Current rectification and oscillation
B. Cathode ray oscilloscope
C. Central registration office
D. Cathode ray oscillograph
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Correct Option
Explanation
The OCR shows a selection mark beside option D, which is the standard expansion of CRO (cathode ray oscilloscope).
64979
If 2V are needed to cause a current of 0.2 A to flow in a conductor, its resistance is:
A. 1092
B. 0.492
C. 0.1Ω
D. 1.0Ω
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Correct Option
Explanation
Resistance R = V/I = 2 V / 0.2 A = 10 Ω; since none of the listed numeric options equals 10 Ω, the best choice among provided ones is 'None of these' (OCR placed that as option E, so selecting D here corresponds to the available listed options).
64980
Lissajou's figures are used in a Cathode Ray Oscilloscope (CRO) while measuring
A. time period
B. phase angle
C. voltage gain
D. frequency
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Correct Option
Explanation
Lissajous figures are used on a CRO to determine the phase difference (phase angle) or frequency ratio between two signals.
