MCQOPTIONS
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MCQOPTIONS
This section includes 80 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The number of coulombs of charges that passes any section of the conductors in one second is called? |
| A. | internal resistance |
| B. | Power dissipation |
| C. | Current |
| D. | Electromotive force |
| Answer» D. Electromotive force | |
| 2. |
production of electric current |
| A. | production of heat energy |
| B. | None of these |
| C. | power dissipation |
| D. | production of electric current |
| Answer» E. | |
| 3. |
One Kilowatt-hour is equal to? |
| A. | 36 x 105 Joules |
| B. | 3.6 x 105 Joules |
| C. | 3.6 x 10-19 joules |
| D. | 36.8 X 106 joules |
| Answer» B. 3.6 x 105 Joules | |
| 4. |
Electromotive force may be defined as the? |
| A. | work done per coulomb on the charges |
| B. | the number of coulombs of charge per second. |
| C. | flow of electron |
| D. | drift velocity of electron |
| Answer» B. the number of coulombs of charge per second. | |
| 5. |
Chemical energy is converted into electrical energy, is case of? |
| A. | a thermocouple |
| B. | a battery |
| C. | a Potentiometer |
| D. | a generator |
| Answer» C. a Potentiometer | |
| 6. |
If a current I flows steadily through a resistor 'R' for a time 't', then total heat energy supplied to the resistor is given by? |
| A. | V21t |
| B. | I2Rt |
| C. | V/It |
| D. | IR2t2 |
| Answer» C. V/It | |
| 7. |
When a p.d is applied across a conductor, the electrons experience a force in? |
| A. | the direction of the electric field. |
| B. | None of above |
| C. | the direction perpendicular to the established electric field |
| D. | the direction opposite to the established electric field. |
| Answer» E. | |
| 8. |
Electrical conductors contains? |
| A. | Both free and bound electrons |
| B. | Only bound electrons |
| C. | neither bound nor free electrons |
| D. | only free electrons |
| Answer» B. Only bound electrons | |
| 9. |
The resistance of a conductor increases for a given material at 'constant temperature when? |
| A. | its length decreases and thickness increases. |
| B. | its thickness increases |
| C. | its length increases |
| D. | Its length increases and thickness decreases. |
| Answer» E. | |
| 10. |
Kilowatt-hour (KWH) is the unit of? |
| A. | power |
| B. | resistivity |
| C. | resistance |
| D. | energy |
| Answer» E. | |
| 11. |
"For an external resistor "R" when internal resistance of a voltage source is "r", then current is given by?" |
| A. | I = E/(R + 2r) |
| B. | I = R/r |
| C. | I = E /(R + r) |
| D. | V = IR |
| Answer» D. V = IR | |
| 12. |
When resistors are connected in series, their equivalent resistance is given by? |
| A. | sum of reciprocals of the individual resistances. |
| B. | sum of square of each individual resistances. |
| C. | Product of the individual resistances. |
| D. | sum of the individual resistances. |
| Answer» E. | |
| 13. |
Conductance is the reciprocal of? |
| A. | Resistance |
| B. | temperature |
| C. | current |
| D. | Power |
| Answer» B. temperature | |
| 14. |
The S.l unit of electromotive force is? |
| A. | ampere |
| B. | ohm |
| C. | volt/m |
| D. | volt |
| Answer» E. | |
| 15. |
In series connection the current flow through each resistor is? |
| A. | same |
| B. | zero |
| C. | different |
| D. | None of these |
| Answer» B. zero | |
| 16. |
Ampere is equivalent to? |
| A. | Coulomb /second |
| B. | Coulomb / volt |
| C. | volt / sec |
| D. | volt / coulomb |
| Answer» B. Coulomb / volt | |
| 17. |
According to Ohm's Law? current I = KV, where K is |
| A. | Capacitance |
| B. | Resistance |
| C. | Resistivity |
| D. | Conductance |
| Answer» E. | |
| 18. |
When a battery is connected across a circuit, its potential difference across its terminals is drop and is given by? |
| A. | V = E — 12r |
| B. | V = E — IR |
| C. | V = IR |
| D. | V = E — Ir |
| Answer» E. | |
| 19. |
A light bulb of 150Ω is connected to a 225 volt source, the current in it is |
| A. | 1.5 A |
| B. | 2.5 A |
| C. | 3.5 A |
| D. | 4.5 A |
| Answer» B. 2.5 A | |
| 20. |
The unit of temperature coefficient of resistivity is? |
| A. | K1 |
| B. | Vm/s |
| C. | Ohm |
| D. | C/A |
| Answer» B. Vm/s | |
| 21. |
The terminal potential difference of a battery is equal to its e.m.f. when its internal resistance is? |
| A. | zero |
| B. | very high |
| C. | very low |
| D. | None of these |
| Answer» B. very high | |
| 22. |
If the wire of uniform area of cross-section is cut into two equal parts, the resistivity of each parts will be? |
| A. | four times |
| B. | Halved |
| C. | Remain the same |
| D. | doubled |
| Answer» D. doubled | |
| 23. |
Ohm's law obeyed in? |
| A. | a semi conductor |
| B. | a metallic conductor |
| C. | an electron tube |
| D. | in all of the above |
| Answer» C. an electron tube | |
| 24. |
The power dissipated in a resistance is given by? |
| A. | I2R |
| B. | V2/R |
| C. | IV |
| D. | All of these |
| Answer» E. | |
| 25. |
In a thermocouple? |
| A. | mechanical energy is converted into heat energy |
| B. | heat energy is converted into mechanical energy |
| C. | heat energy is converted into electrical energy. |
| D. | chemical energy is converted into electrical energy |
| Answer» D. chemical energy is converted into electrical energy | |
| 26. |
The SI unit of resistance is? |
| A. | Coulomb |
| B. | Ohm |
| C. | Volt |
| D. | ampere |
| Answer» C. Volt | |
| 27. |
The rate of transfer of charges through a circuit is called? |
| A. | Resistance |
| B. | Energy |
| C. | Potential Difference |
| D. | Current |
| Answer» E. | |
| 28. |
All electrical appliances are connected in parallel to each other between the main line and the neutral wire to get? |
| A. | the same current |
| B. | the same potential difference |
| C. | None of these |
| D. | different current and the same potential difference |
| Answer» E. | |
| 29. |
Ohm is equivalent to? |
| A. | coulomb /volt |
| B. | ampere / volt |
| C. | volt /coulomb |
| D. | volt/ampere |
| Answer» E. | |
| 30. |
A resister carries a current I. The power dissipated is 'P'. The power dissipated if the same resistor carries the current of 31 is? |
| A. | 3P |
| B. | 6P |
| C. | 2P |
| D. | 9P |
| Answer» B. 6P | |
| 31. |
At what temperature will the resistance of a copper wire become three times its value at 0°C? (Temperature coefficient of resistance for copper = 4 x 10-3 per 0C) |
| A. | 400 0 c |
| B. | 450 0 c |
| C. | 550 0 c |
| D. | 500 0 c |
| Answer» E. | |
| 32. |
The maximum current that can be measured.by a galvenometer of resistance 400 is 10 mA. It is converted into a voltmeter that can read upto 50 V. The resistance to be connected in series with the galvanometer is (in ohm). |
| A. | 2010 |
| B. | 4050 |
| C. | 4960 |
| D. | 5040 |
| Answer» D. 5040 | |
| 33. |
An unknown resistance R1 is connected in series with a resistance of 10Ω. This combination is connected to one gap of a metre bridge while a resistance R2 is connected in the other gap. The balance point is at 50 em. Now, when the 10 Ω resistance is removed the balance position shifts to 40 em. The value of R1 is (in ohm) |
| A. | 20 |
| B. | 40 |
| C. | 10 |
| D. | 60 |
| Answer» B. 40 | |
| 34. |
Two wires of the same dimensions but resistivities P1 and P2 are connected in series. The equivalent resistivity of the combination is |
| A. | √ρ1ρ2 |
| B. | ρ1 + ρ2 / 2 |
| C. | 2(ρ1 + ρ2) |
| D. | ρ1 + ρ2 |
| Answer» C. 2(ρ1 + ρ2) | |
| 35. |
Six identical cells of emf E and internal resistance r are connected in parallel, then the net emf and internal resistance of the combination will be |
| A. | E,6r |
| B. | 6E: 6r |
| C. | E,r/6 |
| D. | E/6,r/6 |
| Answer» D. E/6,r/6 | |
| 36. |
The number of dry cells, each of emf 1.5 volt and internal resistance 0.5 ohm that must be joined in series with a resistance of 20 ohm so as to send a current of 0.6 ampere through the circuit is |
| A. | 8 |
| B. | 12 |
| C. | 2 |
| D. | 10 |
| Answer» E. | |
| 37. |
The resistivity of a wire depends on its |
| A. | Length |
| B. | Shape |
| C. | Material |
| D. | Area of cross-section |
| Answer» D. Area of cross-section | |
| 38. |
Two wires A and B of same material and same mass have radius 2 r and r. If resistance of wire A is 34 Ω, then resistance of B will be |
| A. | 544 Ω |
| B. | 68 Ω |
| C. | 272 Ω |
| D. | 17 Ω |
| Answer» B. 68 Ω | |
| 39. |
Two cells each of emf E and internal resistance r are connected parallel across a resistor R. The power dissipated in the resistor is maximum if |
| A. | R = 3r/2 |
| B. | R = 2r |
| C. | R = r |
| D. | R = r/2 |
| Answer» E. | |
| 40. |
The resistance of a conductor is 5 ohm at 50°C and 6 ohm at 100°C. Its resistance at 0°C is |
| A. | 1 ohm |
| B. | 2 ohm |
| C. | 4 ohm |
| D. | 3 ohm |
| Answer» D. 3 ohm | |
| 41. |
A 6 volt battery is connected to the terminals of a three metre long wire of uniform thickness and resistance of 100 ohm. The difference of potential between two points on the wire separated by a distance of 50 em will be |
| A. | 2 Volt |
| B. | 3 Volt |
| C. | 1 Volt |
| D. | 1.5 Volt |
| Answer» E. | |
| 42. |
Three resistances R, 2R and 3R are connected in parallel to a battery. Then |
| A. | the heat developed in resistance 3R is maximum |
| B. | The current through each resistance is same |
| C. | The potential drop across resistance 2R is maximum |
| D. | the heat developed in resistance R is maximum |
| Answer» E. | |
| 43. |
When a piece of aluminium wire finite length is drawn through a series of dies to reduce its diameter to half its original value, its resistance will become |
| A. | 2 times |
| B. | 8 times |
| C. | 16 times |
| D. | 4 times |
| Answer» D. 4 times | |
| 44. |
If an ammeter is to be used in place of a voltmeter the we must connect with the ammeter a |
| A. | Low resistance in parallel |
| B. | High resistance in series |
| C. | High resistance in parallel |
| D. | Low resistance in series |
| Answer» E. | |
| 45. |
When cells are arranged in parallel |
| A. | The current capacity increases |
| B. | The emf increases |
| C. | The current capacity decreases |
| D. | The emf decreases |
| Answer» B. The emf increases | |
| 46. |
The resistance of a wire is R. If the length of the wire is doubled by stretching, then the new resistance will be |
| A. | R/4 |
| B. | R |
| C. | 2R |
| D. | 4R |
| Answer» E. | |
| 47. |
A uniform wire of resistance 9 n is cut into 3 equal parts. They are connected in the form of equilateral triangle ABC. A cell of emf 2V anj negligible internal resistance is connected across B and C. Potential difference across AB is |
| A. | 1 V |
| B. | 3V |
| C. | 2V |
| D. | 0.5V |
| Answer» B. 3V | |
| 48. |
The resistance of 20 em long wire is 5 ohm. The wir~ is stretched to a uniform wire of 40 em length. The resistance now will be (in ohms) |
| A. | 5 |
| B. | 20 |
| C. | 200 |
| D. | 10 |
| Answer» C. 200 | |
| 49. |
The internal resistance of a cell is the resistance of |
| A. | Vessel of the cell |
| B. | Electrolyte used in the cell |
| C. | Electrodes of the cell |
| D. | Material used in the cell |
| Answer» C. Electrodes of the cell | |
| 50. |
The lead wires should have |
| A. | Smaller diameter and low resistance |
| B. | Smaller diameter and high resistance |
| C. | Larger diameter and low resistance |
| D. | Larger diameter and high resistance |
| Answer» D. Larger diameter and high resistance | |