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2021 49 questions

Q322021 · 1 Sept 2021 · Shift 2
1. A. $1 m/s$
2. B. $1 cm/s$
3. C. $1 0^{2} m/s$
4. D. $1 0^{- 2} cm/s$
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Answer: B
Q392021 · 1 Sept 2021 · Shift 2
Two resistors $R_{1} = (4 \pm 0.8) Ω$ and $R_{2} = (4 \pm 0.4) Ω$ are connected in parallel. The equivalent resistance of their parallel combination will be :
1. A. $(4 \pm 0.4) Ω$
2. B. $(2 \pm 0.4) Ω$
3. C. $(2 \pm 0.3) Ω$
4. D. $(4 \pm 0.3) Ω$
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Answer: C
Q422021 · 1 Sept 2021 · Shift 2
1. A. $3.75 A$
2. B. $2.35 A$
3. C. $2 A$
4. D. $2.73 A$
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Answer: C
Q432021 · 1 Sept 2021 · Shift 2
1. A. $6 A$
2. B. $25 A$
3. C. $10 A$
4. D. $0 A$
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Answer: C
Q562021 · 1 Sept 2021 · Shift 2· Numerical answer
A uniform heating wire of resistance $36 Ω$ is connected across a potential difference of $240 V$ . The wire is then cut into half and potential difference of $240 V$ is applied across each half separately. The ratio of power dissipation in first case to the total power dissipation in the second case would be 1 : x, where x is ____.
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Answer: 4
Q382021 · 26 Aug 2021 · Shift 2
If you are provided a set of resistances $2Ω$ , $4Ω$ , $6Ω$ and $8Ω$ . Connect these resistances so as to obtain an equivalent resistance of $\frac{46}{3} Ω$ .
1. A. $4Ω$ and $6Ω$ are in parallel with $2Ω$ and $8Ω$ in series
2. B. $6Ω$ and $8Ω$ are in parallel with $2Ω$ and $4Ω$ in series
3. C. $2Ω$ and $6Ω$ are in parallel with $4Ω$ and $8Ω$ in series
4. D. $2Ω$ and $4Ω$ are in parallel with $6Ω$ and $8Ω$ in series
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Answer: D
Q422021 · 26 Aug 2021 · Shift 2
An electric bulb of $500 watt$ at $100 volt$ is used in a circuit having a $200 V$ supply. Calculate the resistance R to be connected in series with the bulb so that the power delivered by the bulb is $500 W$ .
1. A. $20 Ω$
2. B. $30 Ω$
3. C. $5 Ω$
4. D. $10 Ω$
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Answer: A
Q482021 · 27 Jul 2021 · Shift 2
The resistance of a conductor at $1 5^{\circ} C$ is $16Ω$ and at $10 0^{\circ} C$ is $20Ω$ . What will be the temperature coefficient of resistance of the conductor?
1. A. $0.01 0^{\circ} C^{- 1}$
2. B. $0.03 3^{\circ} C^{- 1}$
3. C. $0.00 3^{\circ} C^{- 1}$
4. D. $0.04 2^{\circ} C^{- 1}$
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Answer: C
Q532021 · 27 Jul 2021 · Shift 2· Numerical answer
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Answer: 60
Q562021 · 27 Jul 2021 · Shift 2· Numerical answer
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Answer: 1
Q492021 · 25 Jul 2021 · Shift 1
1. A.5 V
2. B.2.25 V
3. C.6 V
4. D.2.75 V
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Answer: A
Q532021 · 25 Jul 2021 · Shift 1· Numerical answer
An inductor of 10 mH is connected to a 20V battery through a resistor of $10 kΩ$ and a switch. After a long time, when maximum current is set up in the circuit, the current is switched off. The current in the circuit after $1 μ s$ is $\frac{x}{100}$ mA. Then x is equal to ____. (Take $e^{- 1} = 0.37$ )
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Answer: 74
Q542021 · 25 Jul 2021 · Shift 1· Numerical answer
A circular conducting coil of radius 1 m is being heated by the change of magnetic field $B$ passing perpendicular to the plane in which the coil is laid. The resistance of the coil is $2 μ Ω$ . The magnetic field is slowly switched off such that its magnitude changes in time as $B = \frac{4}{π} \times 1 0^{- 3} T (1 - \frac{t}{100})$ The energy dissipated by the coil before the magnetic field is switched off completely is E = ____ mJ.
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Answer: 80
Q582021 · 25 Jul 2021 · Shift 1· Numerical answer
An electric bulb rated as 200 W at 100 V is used in a circuit having 200 V supply. The resistance 'R' that must be put in series with the bulb so that the bulb delivers the same power is ____ $Ω$ .
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Answer: 50
Q362021 · 25 Jul 2021 · Shift 2
A $10 Ω$ resistance is connected across $220 V - 50 Hz$ AC supply. The time taken by the current to change from its maximum value to the rms value is :
1. A.2.5 ms
2. B.1.5 ms
3. C.3.0 ms
4. D.4.5 ms
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Answer: A
Q492021 · 25 Jul 2021 · Shift 2
1. A. $\frac{5}{3}$
2. B. $\frac{8}{5}$
3. C. $\frac{4}{3}$
4. D. $\frac{3}{2}$
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Answer: A
Q502021 · 25 Jul 2021 · Shift 2
1. A.10 V
2. B.5 V
3. C. $\frac{40}{9}$ V
4. D. $\frac{40}{11}$ V
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Answer: C
Q532021 · 25 Jul 2021 · Shift 2· Numerical answer
A $16 Ω$ wire is bent to form a square loop. A 9V supply having internal resistance of $1Ω$ is connected across one of its sides. The potential drop across the diagonals of the square loop is ____ $\times 1 0^{- 1}$ V
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Answer: 45
Q542021 · 25 Jul 2021 · Shift 2· Numerical answer
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Answer: 500
Q322021 · 22 Jul 2021 · Shift 2
1. A. $0.0858 m Ω$
2. B. $1.420 m Ω$
3. C. $0.858 m Ω$
4. D. $2.170 m Ω$
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Answer: C
Q422021 · 22 Jul 2021 · Shift 2
Match List - I with List - II | | List - I | | List - II | |---|---|---|---| | (a) | $ω L > \frac{1}{ω C}$ | (i) | Current is in phase with emf | | (b) | $ω L = \frac{1}{ω C}$ | (ii) | Current lags behind the applied emf | | (c) | $ω L < \frac{1}{ω C}$ | (iii) | Maximum current occurs | | (d) | Resonant frequency | (iv) | Current leads the emf | Choose the correct answer from the options given below
1. A.a(ii), b(i), c(iv), d(iii)
2. B.a(ii), b(i), c(iii), d(iv)
3. C.a(iii), b(i), c(iv), d(ii)
4. D.a(iv), b(iii), c(ii), d(i)
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Answer: A
Q542021 · 22 Jul 2021 · Shift 2· Numerical answer
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Answer: 500
Q572021 · 22 Jul 2021 · Shift 2· Numerical answer
In an electric circuit, a cell of certain emf provides a potential difference of $1.25 V$ across a load resistance of $5Ω$ . However, it provides a potential difference of $1 V$ across a load resistance of $2Ω$ . The emf of the cell is given by $\frac{x}{10} V$ . Then the value of x is ________.
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Answer: 15
Q322021 · 20 Jul 2021 · Shift 1
1. A. $25 mA$
2. B. $0.1 A$
3. C. $0.15 A$
4. D. $0.05 A$
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Answer: A
Q402021 · 20 Jul 2021 · Shift 1
1. A. $4 A$
2. B. $8 A$
3. C. $10 A$
4. D. $6 A$
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Answer: C