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Published on: 23/05/2021
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Download CBSE Class 12th Standard CBSE Physics question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Physics
Questions + Answers key
Take MCQ Physics Test1.
A 220 V AC supply is connected between points A and B (figure). What will be the potential difference V across the capacitor?
220 V
110 V
0 V
\(220 \sqrt{2} \mathrm{~V}\)
2.
The breakdown in a reverse biased p-n junction is more likely to occur due to
large velocity of the minority charge carriers if the doping concentration is small
large velocity of the minority charge carriers if the doping concentration is large
strong electric field in a depletion region if the doping concentration is small
strong electric field in the depletion region if the doping concentration is large
3.
To reduce the ripples in rectfier circuit with capacitor filter
\({ R }_{ L }\) should be increased
input frequency should be decreased
input frequency should be increased
capacitors with high capacitance should be used
4.
What happens during regulation action of a zener diode?
The current in and voltage across the zener remains fixed.
The current through the series Resisitance \((R_{ 3 })\) changes
The zener resistanceis constant
The resistance offered by the Zener changes
5.
In the depletion region of a diode
there are no mobile charges
equal number of holes and electrons exist, making the region neutral
recombination of holes and electrons has taken place
mmobile charged ions exist
1.
(d)
\(220 \sqrt{2} \mathrm{~V}\)
2.
(a)
large velocity of the minority charge carriers if the doping concentration is small
3.
(a)
\({ R }_{ L }\) should be increased
4.
(b)
The current through the series Resisitance \((R_{ 3 })\) changes
5.
(a)
there are no mobile charges
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