MCQOPTIONS
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MCQOPTIONS
This section includes 253 Mcqs, each offering curated multiple-choice questions to sharpen your UPSEE knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
10 cells are connected in parallel with the internal resistance of 1 Ω and 1.5 Volts. the total voltage and total resistance is ______ |
| A. | 10 V and 1.5 Ω |
| B. | 1.5 V and 0.1 Ω |
| C. | 100 V and 50 Ω |
| D. | 1.8 V and 1.5 Ω |
| Answer» C. 100 V and 50 Ω | |
| 2. |
In a meter bridge, the wire of length 1 m has a non-uniform cross section such that the variation \(\frac{{{\rm{dR}}}}{{{\rm{dl}}}}\) of its resistance R with length l is\(\frac{{dR}}{{dl}} \propto \frac{1}{{\sqrt l }}\). Two equal resistance are connected as shown in the figure. The galvanometer has zero deflection when the jockey is at point P. What is the length AP? |
| A. | 0.3 m |
| B. | 0.25 m |
| C. | 0.2 m |
| D. | 0.35 m |
| Answer» C. 0.2 m | |
| 3. |
If 'τ' is the relaxation time, 'n' is the number of free electrons per unit volume in the conductor ('e' is charge and 'm' is mass of an electron) then, the term "ne2τ/m" is equal to the __________. |
| A. | conductivity |
| B. | resistivity |
| C. | permittivity |
| D. | mobility |
| Answer» B. resistivity | |
| 4. |
A coil of self-inductance 10 mH and resistance 0.1 Ω is connected through a switch to a battery of internal resistance 0.9 Ω. After the switch is closed, the time taken for the current to attain 80% of the saturation value is [take ln 5 = 1.6] |
| A. | 0.324 s |
| B. | 0.103 s |
| C. | 0.002 s |
| D. | 0.016 s |
| Answer» E. | |
| 5. |
In a meter bridge experiment, the circuit diagram and the corresponding observation table are shown in figure.Sl. NoR (Ω)l (cm)1.1000602.100133.101.54.11.0Which of the reading is inconsistent? |
| A. | 3 |
| B. | 2 |
| C. | 4 |
| D. | 1 |
| Answer» D. 1 | |
| 6. |
Heat generated in a resistive wire at given time period is ___________ |
| A. | proportional to the square of the time of current flow |
| B. | proportional to the square of the current flowing in the wire |
| C. | proportional to the square of the resistance of the wire |
| D. | proportional to the cube of the resistance of the wire |
| Answer» C. proportional to the square of the resistance of the wire | |
| 7. |
Direction of flow of electric current is from |
| A. | Negative Terminal to Positive Terminal |
| B. | Positive Terminal to Negative Terminal |
| C. | Both |
| D. | None of these |
| Answer» C. Both | |
| 8. |
If 'E' is magnitude of uniform electric field in a conductor, 'τ' is the relaxation time, ('e' is charge and'm' is mass of an electron) then, the term -eEτ/m is equal to the ______________ the electrons |
| A. | force experienced by |
| B. | acceleration experienced by |
| C. | drift velocity of |
| D. | charge density due to |
| Answer» D. charge density due to | |
| 9. |
In the given circuit diagram, the currents I1 = -0.3 A, I4 = 0.8 A and I5 = 0.4 A, are flowing as shown. The currents I2, I3 and I6 respectively, are |
| A. | 1.1 A, 0.4 A, 0.4 A |
| B. | 1.1 A, -0.4 A, 0.4 A |
| C. | 0.4 A, 1.1 A, 0.4 A |
| D. | -0.4 A, 0.4 A, 1.1 A |
| Answer» B. 1.1 A, -0.4 A, 0.4 A | |
| 10. |
If resistance of a metal wire of length L and area of cross section A is given as R = L/σA, then σ represents ______________ of the material. |
| A. | conductivity |
| B. | resistivity |
| C. | permittivity |
| D. | susceptibility |
| Answer» B. resistivity | |
| 11. |
Find the potential difference across the resistance R2 in the given circuit (Given R1 = 15 ohm, R2 = 15 ohm, R3 = 30 ohm and R4 = 35 ohm) |
| A. | 4.5 V |
| B. | 3.5 V |
| C. | 7.5 V |
| D. | 6.5 V |
| Answer» D. 6.5 V | |
| 12. |
If there is an increase in current in a circuit with 5 ohms resistance, the voltage:A. will decreaseB. will increaseC. will remain the sameD. will be zero |
| A. | A |
| B. | C |
| C. | B |
| D. | D |
| Answer» D. D | |
| 13. |
In an experiment, the resistance of a material is plotted as a function of temperature (in some range). As shown in the figure, it is a straight line.One may conclude that: |
| A. | \({\rm{R}}\left( {\rm{T}} \right) = \frac{{{{\rm{R}}_0}}}{{{{\rm{T}}^2}}}\) |
| B. | \({\rm{R}}\left( {\rm{T}} \right) = {{\rm{R}}_0}{{\rm{e}}^{ - {\rm{T}}_0^2/{{\rm{T}}^2}}}\) |
| C. | \({\rm{R}}\left( {\rm{T}} \right) = {{\rm{R}}_0}{{\rm{e}}^{ - {{\rm{T}}^2}/{\rm{T}}_0^2}}\) |
| D. | \({\rm{R}}\left( {\rm{T}} \right) = {{\rm{R}}_0}{{\rm{e}}^{{{\rm{T}}^2}/{\rm{T}}_0^2}}\) |
| Answer» C. \({\rm{R}}\left( {\rm{T}} \right) = {{\rm{R}}_0}{{\rm{e}}^{ - {{\rm{T}}^2}/{\rm{T}}_0^2}}\) | |
| 14. |
If a machine works with the rate of 10 Joule/s then its power will be |
| A. | 10 watt |
| B. | 20 watt |
| C. | 60 watt |
| D. | 1 watt |
| Answer» B. 20 watt | |
| 15. |
For which of the following pair of resistors, the balancing length is not 0.25 m in a meter bridge? |
| A. | 1 Ω, 3 Ω |
| B. | 7/3 Ω, 7 Ω |
| C. | 25 Ω, 75 Ω |
| D. | 2 Ω, 3 Ω |
| Answer» E. | |
| 16. |
Consider the following circuit:Which one of the following is the value of the resistance between points A and B in the circuit given above? |
| A. | \(\frac{2}{5}R\) |
| B. | \(\frac{3}{5}R\) |
| C. | \(\frac{3}{2}R\) |
| D. | 4 R |
| Answer» C. \(\frac{3}{2}R\) | |
| 17. |
Let l, r, c and v represent inductance, resistance, capacitance and voltage, respectively. The dimension of \(\frac{l}{{rcv}}\) in SI units will be |
| A. | [LT2] |
| B. | [LTA] |
| C. | [A-1] |
| D. | [LA-2] |
| Answer» D. [LA-2] | |
| 18. |
_______ states that the electric current flowing through a metallic wire is directly proportional to the potential difference ‘V’ across its ends provided its temperature remains the same. |
| A. | Joule’s law |
| B. | Ohm’s law |
| C. | Coulomb’s law |
| D. | Ampere’s law |
| Answer» C. Coulomb’s law | |
| 19. |
A copper wire is stretched to make it 0.5% longer. The percentage change in its electrical resistance if its volume remains unchanged is: |
| A. | 2.0% |
| B. | 2.5% |
| C. | 1.0% |
| D. | 0.5% |
| Answer» D. 0.5% | |
| 20. |
Find the magnetic field at point P due to a straight line segment AB of length 6 cm carrying a current of 5 A. (See figure)(μo = 4π × 10-7 N-A-2) |
| A. | 2.0 × 10-5 T |
| B. | 1.5 × 10-5 T |
| C. | 3.0 × 10-5 T |
| D. | 2.5 × 10-5 T |
| Answer» C. 3.0 × 10-5 T | |
| 21. |
A resistor which has a gold coloured ring signifies that the resistor has __________ percent tolerance. |
| A. | 10 |
| B. | 1 |
| C. | 5 |
| D. | 20 |
| Answer» D. 20 | |
| 22. |
A wire of copper having length I and area of cross-section A is taken and a current I is flown through it. The power dissipated in the wire is P. If we take an aluminum wire having same dimensions and pass the same current through it, the power dissipated will be |
| A. | P |
| B. | < P |
| C. | > P |
| D. | 2P |
| Answer» D. 2P | |
| 23. |
An electric current always produces a/an ______ field. |
| A. | Volatile |
| B. | Versatile |
| C. | Kinetic |
| D. | Magnetic |
| Answer» E. | |
| 24. |
An electric bulb of 60 W is connected to a source of 240 V. The current drawn by the bulb will be: |
| A. | 4 A |
| B. | 2.5 A |
| C. | 0.25 A |
| D. | 0.4 A |
| Answer» D. 0.4 A | |
| 25. |
In Wheatstone bridge method of finding unknown resistance or inductance, the instrument used as null detector is |
| A. | Ammeter |
| B. | Voltmeter |
| C. | Galvanometer |
| D. | All of these |
| Answer» D. All of these | |
| 26. |
In the circuit shown, the potential difference between A and B is |
| A. | 3V |
| B. | 1V |
| C. | 6V |
| D. | 2V |
| Answer» E. | |
| 27. |
A battery of 15 volt is connected to a parallel group of resistances of 4, 10 and 20 ohm. The current in the circuit will be (A = ampere) |
| A. | 6 A |
| B. | 4 A |
| C. | 8 A |
| D. | 2 A |
| Answer» B. 4 A | |
| 28. |
An electric current of 0.40 A flows in metallic conducting wire for 16 min. Then, the electric charge that passes through a cross-sectional area of the metallic wire during this time is |
| A. | 6.4 C |
| B. | 64 C |
| C. | 384 C |
| D. | 16 C |
| Answer» D. 16 C | |
| 29. |
A current of 0.5 A is drawn by a filament of an electric bulb for 20 minutes, find the amount of electric charge that flows through the circuit. |
| A. | 300 Coulomb |
| B. | 600 Coulomb |
| C. | 2400 Coulomb |
| D. | 20 Coulomb |
| Answer» C. 2400 Coulomb | |
| 30. |
In a meter bridge, the null point is found at a distance of 33.7 cm from terminal A (known resistance R is connected to the gap near to A). If the resistance of 12 Ω is connected parallel to unknown resistance X (which is connected to the gap near to terminal B), the null point is found at 51.9 cm. The value of X is |
| A. | 13.5 Ω |
| B. | 27.0 Ω |
| C. | 25.5 Ω |
| D. | 3.0 Ω |
| Answer» B. 27.0 Ω | |
| 31. |
A 20 Henry inductor coil is connected to a 10-ohm resistance in series as shown in figure. The time at which rate of dissipation of energy (Joule's heat) across resistance is equal to the rate at which magnetic energy is stored in the inductor, is: |
| A. | \(\frac{2}{{{\rm{ln\;}}2}}\) |
| B. | \(\frac{1}{2}{\rm{ln\;}}2\) |
| C. | 2 ln 2 |
| D. | ln 2 |
| Answer» D. ln 2 | |
| 32. |
In a fuel cell, electric current is produced when |
| A. | hydrogen and oxygen react with each other and electrons are freed |
| B. | hydrogen reacts with water and electrons are freed |
| C. | oxygen reacts with water and electrons are freed |
| D. | electrons react with molecules of hydrogen and oxygen is freed |
| Answer» B. hydrogen reacts with water and electrons are freed | |
| 33. |
Determine the charge on the capacitor in the following circuit |
| A. | 60 μC |
| B. | 2 μC |
| C. | 10 μC |
| D. | 200 μF C |
| Answer» E. | |
| 34. |
A fuse wire must be |
| A. | conducting and of low melting point |
| B. | conducting and of high melting point |
| C. | insulator and of high melting point |
| D. | insulator and of low melting point |
| Answer» B. conducting and of high melting point | |
| 35. |
In the formula, X = 5YZ2, X and Z have dimensions of capacitance and magnetic field, respectively. What are the dimensions of Y in SI units? |
| A. | [M-3 L-2 T8 A4] |
| B. | [M-1 L-2 T4 A2] |
| C. | [M-2 L0 T-4 A-2] |
| D. | [M-2 L-2 T6 A3] |
| Answer» B. [M-1 L-2 T4 A2] | |
| 36. |
If 'E' is magnitude of uniform electric field in a conductor, 'τ' is the relaxation time, 'n' is the number of free electrons per unit volume in the conductor ('e' is charge and 'm' is mass of an electron) then, the term ne2Eτ/m is equal to the ______________ |
| A. | conductivity |
| B. | resistivity |
| C. | current density |
| D. | permittivity |
| Answer» D. permittivity | |
| 37. |
Potential Difference is |
| A. | Scalar Quantity |
| B. | Vector Quantity |
| C. | Both Scalar Quantity & Vector Quantity |
| D. | None of these |
| Answer» B. Vector Quantity | |
| 38. |
If 400 Ω resistance is made by adding four 100 Ω resistance of tolerance 5%, then the tolerance combination is |
| A. | 20% |
| B. | 5% |
| C. | 10% |
| D. | 15% |
| Answer» B. 5% | |
| 39. |
Pure water can be made to conduct electricity by dissolving |
| A. | Vegetable oil |
| B. | Honey |
| C. | Common salt |
| D. | Sugar |
| Answer» D. Sugar | |
| 40. |
A cell of internal resistance r drives current through an external resistance R. The power delivered by the cell to the external resistance will be maximum when: |
| A. | R = 0.001 r |
| B. | R = 1000 r |
| C. | R = 2r |
| D. | R = r |
| Answer» E. | |
| 41. |
If 20 Coulombs of charge passes a point in a circuit in 1 second, what is the value of the current flowing? |
| A. | 20 Ampere |
| B. | 5 Ampere |
| C. | 10 Ampere |
| D. | 15 Ampere |
| Answer» B. 5 Ampere | |
| 42. |
A 200 Ω resistor has a certain colour code. If one replaces the red colour by green in the code, the new resistance will be: |
| A. | 100 Ω |
| B. | 400 Ω |
| C. | 300 Ω |
| D. | 500 Ω |
| Answer» E. | |
| 43. |
A metal wire of resistance 3 Ω is elongated to make a uniform wire of double its previous length. This new wire is now bent and the ends joined to make a circle. If two points on this circle make an angle 60° at the centre, the equivalent resistance between these two points will be: |
| A. | \(\frac{{12}}{5}{\rm{\Omega }}\) |
| B. | \(\frac{{5}}{2}{\rm{\Omega }}\) |
| C. | \(\frac{{5}}{3}{\rm{\Omega }}\) |
| D. | \(\frac{{7}}{2}{\rm{\Omega }}\) |
| Answer» D. \(\frac{{7}}{2}{\rm{\Omega }}\) | |
| 44. |
A parallel plate capacitor has 1 μF capacitance. One of its two plates is given +2 μC charge and the other plate, +4 μC charge. The potential difference developed across the capacitor is: |
| A. | 3 V |
| B. | 1 V |
| C. | 5 V |
| D. | 2 V |
| Answer» C. 5 V | |
| 45. |
Identify the conductor having the highest resistivity. |
| A. | Mercury |
| B. | Silver |
| C. | Aluminium |
| D. | Copper |
| Answer» B. Silver | |
| 46. |
A 4Ω resistance wire is doubled on it. Calculate the new resistance of the wire. |
| A. | 1.5 Ω |
| B. | 2.00 Ω |
| C. | 1.00 Ω |
| D. | 1.25 Ω |
| Answer» D. 1.25 Ω | |
| 47. |
In the context of the units for measuring electric power, which of the following statements is NOT correct? |
| A. | A watt is the unit of electrical power equal to one joule per second. |
| B. | The one unit of electric energy is equal to one kilo-watt hour (KWh). |
| C. | 1 Kilowatt is equal to 10000 Watts. |
| D. | The SI unit for measuring electric power is Watt. |
| Answer» D. The SI unit for measuring electric power is Watt. | |
| 48. |
A ______ is a passive two - terminal electrical component that implements electrical resistance as a circuit element. |
| A. | Capacitor |
| B. | Resistor |
| C. | Diode |
| D. | Inductor |
| Answer» C. Diode | |
| 49. |
A current of 5 A passes through a copper conductor (resistivity = 1.7 × 10-8 Ωm) of radius of cross-section 5 mm. Find the mobility of the charges if their drift velocity is 1.1 × 10-3 m/s |
| A. | 1.8 m2/Vs |
| B. | 1.5 m2/Vs |
| C. | 1.3 m2/Vs |
| D. | 1.0 m2/Vs |
| Answer» E. | |
| 50. |
According to Ohm’s law, if current (I) increases and potential difference (V) remains constant, then: |
| A. | Resistance unchanged |
| B. | Resistance increases |
| C. | Potential difference decreases |
| D. | Resistance decreases |
| Answer» E. | |