In half-wave rectification, if the input frequency is \(60\) Hz, then the output frequency would be:
1. \(120\) Hz
2. zero
3. \(30\) Hz
4. \(60\) Hz

Subtopic:  Rectifier |
 63%
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As the temperature increases, the electrical resistance:
1. decreases for conductors but increases for semiconductors
2. increases for both conductors and semiconductors
3. decreases for both conductors and semiconductors
4. increases for conductors but decreases for semiconductors
Subtopic:  Energy Band theory |
 72%
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In the given circuits (a), (b) and (c), the potential drop across the two \({\mathrm{p\text-n}}\) junctions are equal in: 
        
1. both circuits (a) and (c)
2. circuit (a) only
3. circuit (b) only
4. circuit (c) only
Subtopic:  PN junction |
 65%
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The truth table for the given logic circuit is:
1.
A B C
0 0 0
0 1 1
1 0 0
1 1 1
2.
A B C
0 0 0
0 1 1
1 0 1
1 1 0
3.
A B C
0 0 1
0 1 0
1 0 0
1 1 1
4.
A B C
0 0 1
0 1 0
1 0 1
1 1 0
Subtopic:  Logic gates |
 59%
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Two amplifiers of voltage gain 20 each, are cascaded in series. If 0.01 volt a.c. input signal is applied across the first amplifier, the output a.c. signal of the second amplifier in volts is:
1. 2.0
2. 4.0
3. 0.01
4. 0.20

Subtopic:  Applications of Transistor (OLD NCERT) |
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The output of the logic circuit shown is equivalent to a/an:
        
1. \(\mathrm{OR}\) gate
2. \(\mathrm{NOR}\) gate
3. \(\mathrm{AND}\) gate
4. \(\mathrm{NAND}\) gate

Subtopic:  Logic gates |
 70%
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The circuit represents a full wave bridge rectifier when switch \(S\) is open. The output voltage \((\text V_0)\) pattern across \(R_L\) when \(S\) is closed:
 

1.   2.
3. 4.
Subtopic:  Rectifier |
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The incorrect statement about the property of a zener diode is:
1. Zener voltage remains constant at the breakdown.
2. It is designed to operate under reverse bias.
3. The depletion region formed is very wide.
4. \(\mathrm{p}\) and \(\mathrm{n}\) regions of the Zener diode are heavily doped.
Subtopic:  Applications of PN junction |
 52%
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Identify the equivalent logic gate represented by the circuit given below:
           
1. \(\mathrm{OR}\)
2. \(\mathrm{NOR}\)
3. \(\mathrm{AND}\)
4. \(\mathrm{NAND}\)
Subtopic:  Logic gates |
 60%
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The collector current in a common base amplifier using n-p-n transistor is \(24\) mA. If \(80\text{%}\) of the electrons released by the emitter are accepted by the collector, then the base current is numerically:
1. \(6\) mA and leaving the base.
2. \(3\) mA and leaving the base.
3. \(6\) mA and entering the base.
4. \(3\) mA and entering the base.
Subtopic:  Applications of Transistor (OLD NCERT) |
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