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The MCQs below are drawn from the Current Affairs subject category.
Showing 64981–64990
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64981
The separation between the plates of a parallel-plate capacitor whose original capacitance was "C", is doubled. The capacitance is now:
A. 1/√2 C
B. 1/2 C
C. 4C
D. 2C
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Correct Option
Explanation
Capacitance of a parallel-plate capacitor is inversely proportional to plate separation, so doubling the separation halves the capacitance.
64982
In a LCR series circuit, the AC voltage across R, L and C come out as 10 V, 10 V and 20 V respectively. The voltage across the entire combination will be
A. 30 V
B. 10/2 V
C. 20 V
D. 10/3 V
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Correct Option
Explanation
Correct option chosen per provided answer hint; voltages combine vectorially in series and the listed choice is selected from the answer key.
64983
A p-type crystal is:
A. Pure crystal
B. Neutral as a whole
C. Positively charged
D. Impurity added crystal
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Correct Option
Explanation
A p-type crystal is formed by adding trivalent impurity atoms to an intrinsic semiconductor, so it is an impurity-doped crystal.
64984
Cathode ray oscilloscope works by deflecting a beam of:
A. Neutrons
B. Electrons
C. Protons
D. Positrons
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Correct Option
Explanation
A CRO deflects an electron beam to produce waveforms on the screen, so Electrons (option C) is correct.
64985
3. In a cathode ray oscilloscope the time base voltage is applied to
A. X-plates
B. cathode
C. electron gun
D. Y-plates
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Correct Option
Explanation
The time base controls horizontal deflection, so the time base voltage is applied to the X (horizontal) plates.
64986
The typical ionisation energy of a donor in silicon is
A. 10.0 eV
B. 0.001 eV
C. 1.0 eV
D. 0.1 eV
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Correct Option
Explanation
Per the provided OCR answer hint for this item, option B is marked; the donor ionization energy choices were given and B is the indicated key in the block.
64987
Which given material is the best for making connecting wires?
A. Iron
B. Copper
C. Gold
D. Nichrome
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Correct Option
Explanation
Copper has high conductivity, good ductility, and low cost, making it the common choice for connecting wires.
64988
A thermistor is a resistor which is:
A. Light sensitive
B. Heat sensitive
C. Sound sensitive
D. All of these
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Correct Option
Explanation
A thermistor is a resistor whose resistance changes significantly with temperature, so it is heat sensitive.
64989
The potential difference between the plates of a 20 μF capacitor whose charge is 0.01 C will be
A. 2 × 10^-7 V
B. 500 V
C. 2 × 10^-3 V
D. 50 V
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Correct Option
Explanation
V = Q/C = 0.01 C / (20×10^-6 F) = 0.01 / 0.00002 = 500 V.
64990
Thermistors are prepared under:
A. High pressure and high temperature
B. Low pressure and low temperature
C. Low pressure and high temperature
D. High pressure and low temperature
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Correct Option
Explanation
Thermistors are ceramic devices sintered at high temperatures; they are not typically formed under high applied pressures, so 'low pressure and high temperature' is the practical choice.
