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.
| 51. |
By exposure of electrons beams on atoms and observing their behaviour upon fall of beam can help to determine |
| A. | charge |
| B. | weight |
| C. | length |
| D. | all |
| Answer» B. weight | |
| 52. |
In a conductor, if the number of conduction electrons per unit volume is 8.5 × 1028 m-3 and mean free time is 25 fs (femto second), it’s approximate resistivity is:(me = 9.1 × 10-31 kg) |
| A. | 10-6 Ω m |
| B. | 10-7 Ω m |
| C. | 10-8 Ω m |
| D. | 10-5 Ω m |
| Answer» D. 10-5 Ω m | |
| 53. |
A resistance is shown in the figure. Its value and tolerance are given respectively by: |
| A. | 270 Ω, 10% |
| B. | 27 kΩ, 10% |
| C. | 27 kΩ, 20% |
| D. | 270 Ω, 5% |
| Answer» C. 27 kΩ, 20% | |
| 54. |
Fill in the blank with the most appropriate option.18 volts = _________ × 3 ohms. |
| A. | 6 watts |
| B. | 6 amperes |
| C. | 6 milliamperes |
| D. | 6 joules |
| Answer» C. 6 milliamperes | |
| 55. |
Five cells of emf 2V each are connected in parallel combination. Then, the output voltage of this combination will be |
| A. | 10 V |
| B. | 2.5 V |
| C. | 5 V |
| D. | 2 V |
| Answer» E. | |
| 56. |
Drift speed of electrons, when 1.5 A of current flows in a copper wire of cross section 5 mm2, is v. If the electron density in copper is 9 × 1028/m3, the value of v in mm/s is close to (Take charge of electron to be = 1.6 × 10-19 C |
| A. | 0.02 |
| B. | 3 |
| C. | 2 |
| D. | 0.2 |
| Answer» B. 3 | |
| 57. |
In the experimental set up of Meter Bridge shown in the figure, the null point is obtained at a distance of 40 cm from A. If a 10 Ω resistor is connected in series with R1, the null point shifts by 10 cm. The resistance that should be connected in parallel with (R1 + 10) Ω such that the null point shifts back to its initial position is |
| A. | 60 Ω |
| B. | 20 Ω |
| C. | 30 Ω |
| D. | 40 Ω |
| Answer» B. 20 Ω | |
| 58. |
In the case of direct current: |
| A. | Magnitude and direction of current changes with time |
| B. | Magnitude of current changes with time |
| C. | Magnitude and direction of current remains constant |
| D. | Magnitude of current remains constant |
| Answer» D. Magnitude of current remains constant | |
| 59. |
A 2 W carbon resistor is colour coded with green, black, red and brown respectively. The maximum current which can be passed through this resistor is |
| A. | 0.4 Ma |
| B. | 63 mA |
| C. | 20 mA |
| D. | 100 mA |
| Answer» D. 100 mA | |
| 60. |
Permeance of a magnetic circuit corresponds to the following quantity in electrical circuit |
| A. | Conductivity |
| B. | Resistivity |
| C. | Conductance |
| D. | Permeance |
| Answer» D. Permeance | |
| 61. |
Internal resistance of a cell depend on |
| A. | Distance between electrode |
| B. | Area of the electrode |
| C. | Nature of electrode |
| D. | All of these |
| Answer» E. | |
| 62. |
If an input signal with non-zero dc component is applied to a low pass RC network with single resistor R and single capacitor C as shown below, the dc component in the output will be: |
| A. | The same as the input |
| B. | Less than the input |
| C. | More than the input |
| D. | Zero |
| Answer» B. Less than the input | |
| 63. |
An electric motor is marked 2 Hp. The work done by the electric motor in 3 seconds will be nearly |
| A. | 373 J |
| B. | 497 J |
| C. | 1.5 kJ |
| D. | 4.4 kJ |
| Answer» E. | |
| 64. |
Let us consider a copper wire having radius r and length l. Let its resistance be R. If the radius of another copper wire is 2r and the length is l/2 then the resistance of this wire will be |
| A. | R |
| B. | 2R |
| C. | R/4 |
| D. | R/8 |
| Answer» E. | |
| 65. |
Among various electrical safety devices, one based on the heating effect of electric current is called a: |
| A. | Capacitor |
| B. | Surge protector |
| C. | Fuse |
| D. | Protective relay |
| Answer» D. Protective relay | |
| 66. |
In the given circuit the internal resistance of the 18 V cell is negligible. If R1 = 400 Ω, R3 = 100 Ω and R4 = 500 Ω and the reading of an ideal voltmeter across R4 is 5 V, then the value of R2 will be: |
| A. | 300 Ω |
| B. | 450 Ω |
| C. | 550 Ω |
| D. | 230 Ω |
| Answer» B. 450 Ω | |
| 67. |
During measurement of voltage and current in a load, ammeter and voltmeter are connected in series and across the load respectively. If ammeter and voltmeter positions are interchanged by mistake, then |
| A. | voltmeter will be damaged |
| B. | ammeter will be damaged |
| C. | both the meters will be damaged |
| D. | both the meters will be safe |
| Answer» C. both the meters will be damaged | |
| 68. |
In the figure shown, a circuit contains two identical resistors with resistance R = 5 Ω and an inductance with L = 2 mH. An ideal battery of 15 V is connected in the circuit.What will be the current through the battery long after the switch is closed? |
| A. | 6 A |
| B. | 3 A |
| C. | 5.5 A |
| D. | 7.5 A |
| Answer» B. 3 A | |
| 69. |
A moving coil galvanometer, having a resistance G, produces full scale deflection when a current Ig flows through it. This galvanometer can be converted into (i) an ammeter of range 0 to I0 (I0 > Ig) by connecting a shunt resistance RA to it and (ii) into a voltmeter of range 0 to V (V = GI0) by connecting a series resistance RV to it. Then, |
| A. | \({R_A}{R_V} = {G^2}\left( {\frac{{{I_0} - {I_g}}}{{{I_g}}}} \right){\rm{\;and\;}}\frac{{{R_A}}}{{{R_V}}} = {\left( {\frac{{{I_g}}}{{\left( {{I_0} - {I_g}} \right)}}} \right)^2}\) |
| B. | \({R_A}{R_V} = {G^2}{\rm{\;and\;}}\frac{{{R_A}}}{{{R_V}}} = {\left( {\frac{{{I_g}}}{{{I_0} - {I_g}}}} \right)^2}\) |
| C. | \({R_A}{R_V} = {G^2}\left( {\frac{{{I_g}}}{{{I_0} - {I_g}}}} \right){\rm{\;and\;}}\frac{{{R_A}}}{{{R_V}}} = {\left( {\frac{{{I_0} - {I_g}}}{{{I_g}}}} \right)^2}\) |
| D. | \({R_A}{R_V} = {G^2}{\rm{\;and\;}}\frac{{{R_A}}}{{{R_V}}} = \frac{{{I_g}}}{{\left( {{I_0} - {I_g}} \right)}}\) |
| Answer» C. \({R_A}{R_V} = {G^2}\left( {\frac{{{I_g}}}{{{I_0} - {I_g}}}} \right){\rm{\;and\;}}\frac{{{R_A}}}{{{R_V}}} = {\left( {\frac{{{I_0} - {I_g}}}{{{I_g}}}} \right)^2}\) | |
| 70. |
Electrical energy used during a month is expressed in terms of 'units'. Here one unit means |
| A. | 1W |
| B. | 1kWh |
| C. | 1J |
| D. | 1kW |
| Answer» C. 1J | |
| 71. |
A metallic wire having a resistance of 20Ω is cut into two equal parts in length. These parts are then connected in parallel. The resistance of this parallel combination is equal to |
| A. | 20 Ω |
| B. | 10 Ω |
| C. | 5 Ω |
| D. | 15 Ω |
| Answer» D. 15 Ω | |
| 72. |
A current of 2 mA was passed through an unknown resistor which dissipated a power of 4.4 W. Dissipated power when an ideal power supply of 11 V is connected across it is |
| A. | 11 × 10-4 W |
| B. | 11 × 10-5 W |
| C. | 11 × 105 W |
| D. | 11 × 10-3 W |
| Answer» C. 11 × 105 W | |
| 73. |
A wire of resistance R1 is cut into five equal pieces. These five pieces of wire are then connected in parallel. If the resultant resistance of this combination be R2, then ratio R1/R2 is _______. |
| A. | 1/25 |
| B. | 1/5 |
| C. | 5 |
| D. | 25 |
| Answer» E. | |
| 74. |
How many electrons would flow in one second through a conductor of resistance 1000 Ω, which is maintained at a potential difference of 20 V across its two ends ? |
| A. | 1.25 × 1019 |
| B. | 1.25 × 1018 |
| C. | 1.25 × 1017 |
| D. | 1.25 × 1016 |
| Answer» B. 1.25 × 1018 | |
| 75. |
For the circuit shown below, the current through the Zener diode is |
| A. | 14 mA |
| B. | Zero |
| C. | 5 mA |
| D. | 9 mA |
| Answer» E. | |
| 76. |
Conduction of electricity through conductor takes place by |
| A. | Protons |
| B. | Neutrons |
| C. | Bound electrons |
| D. | Free electrons |
| Answer» E. | |
| 77. |
One Coulomb passing a point in one second is one ______. |
| A. | Ohm |
| B. | Charge |
| C. | Ampere |
| D. | Volt |
| Answer» D. Volt | |
| 78. |
A simple circuit contains a 12 V battery and a bulb having 25 ohm resistance. When you turn on the switch, the ammeter connected the circuit would read |
| A. | 0.5 A |
| B. | 2A |
| C. | 4A |
| D. | 5A |
| Answer» B. 2A | |
| 79. |
In a Wheatstone bridge (see figure), resistances P and Q are approximately equal. When R = 400 Ω, the bridge is balanced. On interchanging P and Q, the value of R for balance is 405 Ω. The value of X is close to |
| A. | 404.5 Ω |
| B. | 401.5 Ω |
| C. | 402.5 Ω |
| D. | 403.5 Ω |
| Answer» D. 403.5 Ω | |
| 80. |
If a metal wire of length 'l' and cross section area 'A' has resistance 'R', then the resistivity of the material of the wire is equal to? |
| A. | RA/I |
| B. | RI/A |
| C. | IA/R |
| D. | A/(IR) |
| Answer» B. RI/A | |
| 81. |
A uniform metallic wire has a resistance of 18 Ω and is bent into an equilateral triangle. Then, the resistance between any two vertices of the triangle is |
| A. | 12 Ω |
| B. | 8 Ω |
| C. | 2 Ω |
| D. | 4 Ω |
| Answer» E. | |
| 82. |
A small speaker delivers 2 W of audio output. At what distance from the speaker will one detect 120 dB intensity sound?[Given reference intensity of sound as 10-12 W/m2] |
| A. | 40 cm |
| B. | 20 cm |
| C. | 10 cm |
| D. | 30 cm |
| Answer» B. 20 cm | |
| 83. |
A 1mA ammeter has a resistance of 100 Ω. It is to be converted to a 1A ammeter. The value of shunt resistance is |
| A. | 0.001 Ω |
| B. | 0.1001 Ω |
| C. | 1000000 Ω |
| D. | 100 Ω |
| Answer» C. 1000000 Ω | |
| 84. |
An equilateral triangle has been constructed with a uniform wire whose resistance per unit length is 4Ω cm-1. If the length of each side of the triangle is 10 cm, the resistance across any side will be |
| A. | 80/3Ω |
| B. | 80/Ω |
| C. | 40/Ω |
| D. | 40/3Ω |
| Answer» B. 80/Ω | |
| 85. |
A current of 1.0 A is drawn by a filament of an electric bulb for 10 minutes. The amount of electric charge that flows through the circuit is |
| A. | 0.1 C |
| B. | 10 C |
| C. | 600 C |
| D. | 800 C |
| Answer» D. 800 C | |
| 86. |
In the given circuit, the cells have zero internal resistance. The currents (in Ampere) passing through resistance R1 and R2 respectively are |
| A. | 0.5, 0 |
| B. | 1, 2 |
| C. | 2, 2 |
| D. | 0, 1 |
| Answer» B. 1, 2 | |
| 87. |
1 ampere = _____ |
| A. | 1 coulomb × 1 second |
| B. | 1 volt / 1 second |
| C. | 1 second / 1 coulomb |
| D. | 1 coulomb / 1 second |
| Answer» E. | |
| 88. |
In the voltaic cell, the reaction occurs at anode is |
| A. | Oxidation |
| B. | Reduction |
| C. | Elimination |
| D. | Addition |
| Answer» B. Reduction | |
| 89. |
1 kWh = _____ J |
| A. | 3.6 × 104 J |
| B. | 3.6 × 105 J |
| C. | 3.6 × 106 J |
| D. | 3.6 × 103 J |
| Answer» D. 3.6 × 103 J | |
| 90. |
Identify the main reason why an Ammeter should have very low internal resistance |
| A. | It should provide damping |
| B. | It should decrease the circuit resistance. |
| C. | It should not affect the circuit resistance. |
| D. | It should not burn |
| Answer» D. It should not burn | |
| 91. |
In the figure shown, what is the current (in Ampere) drawn from the battery? You are given:R1 = 15 Ω, R2 = 10 Ω, R3 = 20 Ω, R4 = 5 Ω, R5 = 25 Ω, R6 = 30 Ω, E = 15 V |
| A. | 13/24 |
| B. | 7/18 |
| C. | 9/32 |
| D. | 20/3 |
| Answer» D. 20/3 | |
| 92. |
A moving coil galvanometer can be converted into a ammeter by connecting to the moving coil galvanometer |
| A. | A low resistance in series |
| B. | A low resistance in in parallel |
| C. | A high resistance in parallel |
| D. | A high resistance in series |
| Answer» C. A high resistance in parallel | |
| 93. |
A moving coil galvanometer can be converted into a voltmeter by introducing a resistance of a _________. |
| A. | large value in parallel |
| B. | small value in series |
| C. | small value in parallel |
| D. | large value in series |
| Answer» E. | |
| 94. |
Consider the following part of an electric circuit:The total electrical resistance in the given part of the electric circuit is |
| A. | 15/8 ohm |
| B. | 15/7 ohm |
| C. | 15 ohm |
| D. | 17/3 ohm |
| Answer» C. 15 ohm | |
| 95. |
Current per unit area called current density (j) is equal to? (Where 'e' is charge on an electron, 'σ' is conductivity, 'm' is mass of an electron, 'E' is theelectric field, 'τ' is relaxation time and 'n' is the number of free electrons per unit volume of a metallic conductor) |
| A. | ne2τE |
| B. | ne2τ/m |
| C. | σE |
| D. | eτ/ m |
| Answer» D. eτ/ m | |
| 96. |
If P, Q, R and S represents resistances of 4 arms of the Wheatstone's bridge, then the sensitivity of Wheatstone's bridge will be maximum when |
| A. | P = Q = R > S |
| B. | P = Q = R = S |
| C. | P > Q > R > S |
| D. | P < Q < R < S |
| Answer» C. P > Q > R > S | |
| 97. |
Heat generated in a resistive wire 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 | |
| 98. |
An electric bulb is connected to a 200 V generator. The current is 0.5 A. The power of the bulb is |
| A. | 10 W |
| B. | 1000 W |
| C. | 1 W |
| D. | 100 W |
| Answer» E. | |
| 99. |
A circular coil of single turn has a resistance of 20 Ω. Which one of the following is the correct value for resistance between the ends of any diameter of the coil? |
| A. | 5 Ω |
| B. | 10 Ω |
| C. | 20 Ω |
| D. | 40 Ω |
| Answer» B. 10 Ω | |
| 100. |
One-kilowatt hour is equal to |
| A. | 36× 103 joules |
| B. | 36× 105 joules |
| C. | 103 joules |
| D. | 105 joules |
| Answer» C. 103 joules | |