Current Electricity · JEE Main previous year questions

429 questions asked across 20 exam years, newest first

Year-wise papers Topic-wise questions

Practise this topic

2024 66 questions

Q322024 · 9 Apr 2024 · Shift 1
A galvanometer has a coil of resistance $200Ω$ with a full scale deflection at $20 μ A$ . The value of resistance to be added to use it as an ammeter of range $(0 - 20) mA$ is :
1. A. $0.40Ω$
2. B. $0.10Ω$
3. C. $0.20Ω$
4. D. $0.50Ω$
Show answer
Answer: C
Q472024 · 9 Apr 2024 · Shift 1
1. A. $18 Ω$
2. B. $27 Ω$
3. C. $19 Ω$
4. D. $25 Ω$
Show answer
Answer: C
Q602024 · 9 Apr 2024 · Shift 1· Numerical answer
Show answer
Answer: 25
Q312024 · 9 Apr 2024 · Shift 2
1. A. $\frac{8 R}{3}$
2. B. $\frac{4 R}{3}$
3. C. $\frac{2}{3} R$
4. D. $\frac{5 R}{3}$
Show answer
Answer: A
Q322024 · 9 Apr 2024 · Shift 2
1. A.1, 1
2. B.0, 1
3. C.1, 0
4. D.0, 0
Show answer
Answer: A
Q532024 · 9 Apr 2024 · Shift 2· Numerical answer
Show answer
Answer: 2500
Q572024 · 9 Apr 2024 · Shift 2· Numerical answer
At room temperature ( $2 7^{\circ} C$ ), the resistance of a heating element is $50Ω$ . The temperature coefficient of the material is $2.4 \times 1 0^{- 4}^{\circ} C^{- 1}$ . The temperature of the element, when its resistance is $62Ω$ , is ____ $^{\circ} C$ .
Show answer
Answer: 1027
Q602024 · 9 Apr 2024 · Shift 2· Numerical answer
A capacitor of reactance $43 Ω$ and a resistor of resistance $4Ω$ are connected in series with an ac source of peak value $82 V$ . The power dissipation in the circuit is ____ $W$ .
Show answer
Answer: 4
Q372024 · 8 Apr 2024 · Shift 1
1. A. $A \cdot B$
2. B. $\overset{ˉ}{A} \cdot B$
3. C. $A \cdot B (A + B)$
4. D. $0$
Show answer
Answer: D
Q432024 · 8 Apr 2024 · Shift 1
A LCR circuit is at resonance for a capacitor C, inductance L and resistance R. Now the value of resistance is halved keeping all other parameters same. The current amplitude at resonance will be now:
1. A.halved
2. B.same
3. C.Zero
4. D.double
Show answer
Answer: D
Q492024 · 8 Apr 2024 · Shift 1
1. A. $3 V$
2. B. $4 V$
3. C. $2 V$
4. D. $1.5 V$
Show answer
Answer: C
Q542024 · 8 Apr 2024 · Shift 1· Numerical answer
Show answer
Answer: 3
Q572024 · 8 Apr 2024 · Shift 1· Numerical answer
Resistance of a wire at $0^{\circ} C, 10 0^{\circ} C$ and $t^{\circ} C$ is found to be $10 Ω, 10.2 Ω$ and $10.95 Ω$ respectively. The temperature $t$ in Kelvin scale is ________.
Show answer
Answer: 748
Q362024 · 8 Apr 2024 · Shift 2
Water boils in an electric kettle in $20 minutes$ after being switched on. Using the same main supply, the length of the heating element should be ____ to ____ times of its initial length if the water is to be boiled in $15 minutes$ .
1. A.increased, $\frac{3}{4}$
2. B.increased, $\frac{4}{3}$
3. C.decreased, $\frac{3}{4}$
4. D.decreased, $\frac{4}{3}$
Show answer
Answer: C
Q492024 · 8 Apr 2024 · Shift 2
A coil of negligible resistance is connected in series with $90 Ω$ resistor across $120 V$ , $60 Hz$ supply. A voltmeter reads $36 V$ across resistance. Inductance of the coil is :
1. A. $0.91 H$
2. B. $0.76 H$
3. C. $2.86 H$
4. D. $0.286 H$
Show answer
Answer: B
Q572024 · 8 Apr 2024 · Shift 2· Numerical answer
Show answer
Answer: 5
Q532024 · 6 Apr 2024 · Shift 2· Numerical answer
Show answer
Answer: 160
Q442024 · 5 Apr 2024 · Shift 2
1. A. $4 : 1$
2. B. $2 : 1$
3. C. $1 : 2$
4. D. $1 : 1$
Show answer
Answer: B
Q452024 · 5 Apr 2024 · Shift 2
1. A. $A = 0$ , $B = 0$
2. B. $A = 0$ , $B = 1$
3. C. $A = 1$ , $B = 0$
4. D. $A = 1$ , $B = 1$
Show answer
Answer: A
Q482024 · 5 Apr 2024 · Shift 2
A galvanometer of resistance $100Ω$ when connected in series with $400Ω$ measures a voltage of upto $10 V$ . The value of resistance required to convert the galvanometer into ammeter to read upto $10 A$ is $x \times 1 0^{- 2} Ω$ . The value of $x$ is :
1. A.2
2. B.20
3. C.800
4. D.200
Show answer
Answer: B
Q552024 · 5 Apr 2024 · Shift 2· Numerical answer
A wire of resistance $20Ω$ is divided into 10 equal parts, resulting pairs. A combination of two parts are connected in parallel and so on. Now resulting pairs of parallel combination are connected in series. The equivalent resistance of final combination is ____ $Ω$ .
Show answer
Answer: 5
Q462024 · 4 Apr 2024 · Shift 1
The resistances of the platinum wire of a platinum resistance thermometer at the ice point and steam point are $8 Ω$ and $10 Ω$ respectively. After inserting in a hot bath of temperature $40 0^{\circ} C$ , the resistance of platinum wire is :
1. A. $10 Ω$
2. B. $16 Ω$
3. C. $8 Ω$
4. D. $2 Ω$
Show answer
Answer: B
Q472024 · 4 Apr 2024 · Shift 1
1. A. $(30/11) Ω$
2. B. $6Ω$
3. C. $(5/2) Ω$
4. D. $(15/4) Ω$
Show answer
Answer: B
Q492024 · 4 Apr 2024 · Shift 1
To measure the internal resistance of a battery, potentiometer is used. For $R = 10Ω$ , the balance point is observed at $l = 500 cm$ and for $R = 1Ω$ the balance point is observed at $l = 400 cm$ . The internal resistance of the battery is approximately :
1. A. $0.1Ω$
2. B. $0.3Ω$
3. C. $0.2Ω$
4. D. $0.4Ω$
Show answer
Answer: B
Q592024 · 4 Apr 2024 · Shift 1· Numerical answer
Show answer
Answer: 1