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The MCQs below are drawn from the Current Affairs subject category.
Showing 64941–64950
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64941
A logic circuit whose output signal is '1' when inputs are different is
A. exclusive NOR gate
B. exclusive OR gate
C. NOR gate
D. NAND gate
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Correct Option
Explanation
The exclusive OR (XOR) outputs '1' when its inputs differ, which matches the described behavior.
64942
Which of the following is the proper way to study the sinusoidal waveform of voltage on an oscilloscope?
A. Voltage is connected to 'X' input and time base is switched on
B. Voltage is connected to 'Y' input and time base is switched off
C. Voltage is connected to 'X' input and time base is switched off
D. Voltage is connected to 'Y' input and time base is switched on
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Correct Option
Explanation
To display voltage versus time, connect the signal to the Y input and enable the time base so the horizontal axis represents time.
64943
A type of resistor whose resistance varies significantly with temperature is
A. strain gauge
B. thermistor
C. potentiometer
D. thermocouple
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Correct Option
Explanation
A thermistor is a resistor whose resistance changes appreciably with temperature, so option A is correct.
64944
If the oscilloscope used for read-out has an input resistance of 1 MΩ in parallel with C = 4 x 10^-10 F then the voltage sensitivity constant will be
A. 4000 V/cm
B. 4500 V/cm
C. 2500 V/cm
D. 3334 V/cm
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Correct Option
Explanation
Using the given input capacitance and resistance for the oscilloscope read-out yields a calculated voltage sensitivity of 2500 V/cm, matching option A.
64945
Alnico is an alloy of:
A. Aluminium, nickel, cobalt
B. Aluminium, nitrogen, carbon, oxygen
C. Aluminium, neon, indium, cobalt
D. Argon, neon, carbon, oxygen
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Correct Option
Explanation
Alnico is an alloy whose name denotes aluminum, nickel and cobalt as principal components; the OCR indicates option C selected.
64946
_____ discovered that electric currents produce magnetic fields.
A. Oersted
B. Faraday
C. de Broglie
D. Newton
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Correct Option
Explanation
Hans Christian Oersted observed that electric currents produce magnetic effects, so option D is correct.
64947
Vector area A is a vector whose direction:
A. Is perpendicular to surface element
B. Is along the surface element
C. Depends upon the direction of magnetic field
D. Is at an angle 60° to the surface element
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Correct Option
Explanation
The area vector is defined as perpendicular (normal) to the surface element.
64948
Electric current produces magnetic field was suggested by:
A. Henry
B. Faraday
C. Oersted
D. Lenz
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Correct Option
Explanation
Hans Christian Ørsted discovered that electric current produces a magnetic field, so Oersted is correct.
64949
Magnetic flux passing an element whose vector area makes an angle 0° with lines of magnetic force is:
A. BA cos 0
B. Zero
C. BAV
D. BA sin 0
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Correct Option
Explanation
Flux through an area at angle θ is BA cosθ; for θ = 0°, this equals BA cos0 = BA.
64950
The materials whose resistivity becomes zero below a certain temperature
A. superconductors
B. insulators
C. semiconductors
D. conductors
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Correct Option
Explanation
Superconductors exhibit zero electrical resistivity below a critical temperature, which distinguishes them from conductors and semiconductors.
