Current Electricity · JEE Main previous year questions

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2005 10 questions

Q822005 · 28 Apr 2005 · Shift 1
A bullet fired into a fixed target loses half of its velocity after penetrating $3 cm$ . How much further it will penetrate before coming to rest assuming that it faces constant resistance to motion?
1. A. $2.0 cm$
2. B. $3.0 cm$
3. C. $1.0 cm$
4. D. $1.5 cm$
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Answer: C
Q1172005 · 28 Apr 2005 · Shift 1
1. A. $100Ω$
2. B. $200Ω$
3. C. $1000Ω$
4. D. $500Ω$
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Answer: A
Q1182005 · 28 Apr 2005 · Shift 1
A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10-divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1 volt, the resistance in $o hm s$ needed to be connected in series with the coil will be -
1. A. $1 0^{5}$
2. B. $1 0^{3}$
3. C. $9995$
4. D. $99995$
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Answer: C
Q1192005 · 28 Apr 2005 · Shift 1
Two sources of equal $e m f$ are connected to an external resistance $R$ . The internal resistances of the two sources are $R_{1}$ and $R_{2} (R_{2} > R_{1})$ . If the potential difference across the source having internal resistance $R_{2}$ is zero, then
1. A. $R = R_{2} - R_{1}$
2. B. $R = R_{2} \times (R_{1} + R_{2}) / (R_{2} - R_{1})$
3. C. $R = R_{1} R_{2} / (R_{2} - R_{1})$
4. D. $R = R_{1} R_{2} / (R_{1} - R_{2})$
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Answer: A
Q1212005 · 28 Apr 2005 · Shift 1
The resistance of hot tungsten filament is about 10 times the cold resistance. What will be resistance of $100 W$ and $200 V$ lamp when not in use ?
1. A. $20Ω$
2. B. $40Ω$
3. C. $200Ω$
4. D. $400Ω$
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Answer: B
Q1222005 · 28 Apr 2005 · Shift 1
An energy source will supply a constant current into the load if its internal resistance is
1. A.very large as compared to the load resistance
2. B.equal to the resistance of the load
3. C.non-zero but less than the resistance of the load
4. D.zero
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Answer: A
Q1292005 · 28 Apr 2005 · Shift 1
A circuit has a resistance of $12 ohm$ and an impedance of $15 ohm$ . The power factor of the circuit will be
1. A. $0.4$
2. B. $0.8$
3. C. $0.125$
4. D. $1.25$
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Answer: B
Q1302005 · 28 Apr 2005 · Shift 1
A coil of inductance $300 mH$ and resistance $2 Ω$ is connected to a source of voltage $2 V$ . The current reaches half of its steady state value in
1. A. $0.1 s$
2. B. $0.05 s$
3. C. $0.3 s$
4. D. $0.15 s$
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Answer: A
Q1422005 · 28 Apr 2005 · Shift 1
In a full wave rectifier circuit operating from $50 Hz$ mains frequency, the fundamental frequency in the ripple would be
1. A. $25 Hz$
2. B. $50 Hz$
3. C. $70.7 Hz$
4. D. $100 Hz$
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Answer: D
Q1462005 · 28 Apr 2005 · Shift 1
In a potentiometer experiment the balancing with a cell is at length $240 cm$ . On shunting the cell with a resistance of $2Ω$ , the balancing length becomes $120 cm$ . The internal resistance of the cell is
1. A. $0.5Ω$
2. B. $1Ω$
3. C. $2Ω$
4. D. $4Ω$
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Answer: C