MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A glass rod when rubbed with silk cloth is charged because |
| A. | t takes in proton |
| B. | ts atoms are removed |
| C. | t gives away electrons |
| D. | t gives away positive charge |
| Answer» D. t gives away positive charge | |
| 2. |
Ohm's law is not applicable to |
| A. | emiconductors |
| B. | .C. circuits |
| C. | mall resistors |
| D. | igh currents |
| Answer» B. .C. circuits | |
| 3. |
A nichrome wire used as a heater coil has the resistance of 2 £2/m. For a heater of 1 kW at 200 V, the length of wire required will be |
| A. | 0 m |
| B. | 0 m |
| C. | 0 m |
| D. | 0 m |
| Answer» B. 0 m | |
| 4. |
Out of the following which is an insulating material? |
| A. | opper |
| B. | old |
| C. | ilver |
| D. | aper |
| Answer» E. | |
| 5. |
Switching of a lamp in house produces noise in the radio. This is because switching operation produces |
| A. | rcs across separating contacts |
| B. | echanical noise of high intensity |
| C. | oth mechanical noise and arc between contacts |
| D. | one of the above |
| Answer» B. echanical noise of high intensity | |
| 6. |
Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel.The total resistance of the combination is |
| A. | ohms |
| B. | 0 ohms |
| C. | 5 ohms |
| D. | 5 ohms |
| Answer» B. 0 ohms | |
| 7. |
The ratio of mass of proton to that of electron is nearly |
| A. | 840 |
| B. | 480 |
| C. | 0 |
| Answer» B. 480 | |
| 8. |
Which one of the following does not have negative temperature coefficient? |
| A. | luminium |
| B. | aper |
| C. | ubber |
| D. | ica |
| Answer» B. aper | |
| 9. |
Which of the following can have negative temperature coefficient? |
| A. | ompounds of silver |
| B. | iquid metals |
| C. | etallic alloys |
| D. | lectrolytes |
| Answer» E. | |
| 10. |
The condition for the validity under Ohm's law is that |
| A. | esistance must be uniform |
| B. | urrent should be proportional to the size of the resistance |
| C. | esistance must be wire wound type |
| D. | emperature at positive end should be more than the temperature at negative end |
| Answer» B. urrent should be proportional to the size of the resistance | |
| 11. |
The condition for the validity under Ohm’s law is that |
| A. | esistance must be uniform |
| B. | urrent should be proportional to the size of the resistance |
| C. | esistance must be wire wound type |
| D. | emperature at positive end should be more than the temperature at negative end |
| Answer» B. urrent should be proportional to the size of the resistance | |
| 12. |
For which of the following 'ampere second' could be the unit? |
| A. | eluctance |
| B. | harge |
| C. | ower |
| D. | nergy |
| Answer» C. ower | |
| 13. |
Current velocity through a copper conductor is |
| A. | he same as propagation velocity of electric energy |
| B. | ndependent of current strength |
| C. | f the order of a few micro m/s |
| D. | early 3 x 108 m/s |
| Answer» D. early 3 x 108 m/s | |
| 14. |
The minimum charge on an ion is |
| A. | qual to the atomic number of the atom |
| B. | qual to the charge of an electron |
| C. | qual to the charge of the number of electrons in an atom (#) zero |
| D. | one of these |
| Answer» C. qual to the charge of the number of electrons in an atom (#) zero | |
| 15. |
Devices that does not obey ohm's law are called |
| A. | ohmic devices |
| B. | non ohmic devices |
| C. | electric devices |
| D. | resistive devices |
| Answer» C. electric devices | |
| 16. |
The heat produced by the current in the wire during t time is determined by |
| A. | H = I2R |
| B. | H = IRt |
| C. | H = I2t |
| D. | H = I2Rt |
| Answer» E. | |
| 17. |
The wire wound variable resistance is known as |
| A. | capacitor |
| B. | resistor |
| C. | diode |
| D. | rheostat |
| Answer» E. | |
| 18. |
The formula written as V(Q/T) is the formula of |
| A. | acceleration |
| B. | work done |
| C. | power |
| D. | velocity |
| Answer» D. velocity | |
| 19. |
The resistances used in the circuit of Wheatstone bridge are |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 20. |
Current produces magnetic effect due to its |
| A. | mechanical energy |
| B. | magnetic field |
| C. | electrical field |
| D. | chemical energy |
| Answer» C. electrical field | |
| 21. |
Sum of all the currents meeting at a point is zero, stated law is |
| A. | Kirchhoff's first rule |
| B. | Kirchhoff's third rule |
| C. | Kirchhoff's fourth rule |
| D. | Kirchhoff's second rule |
| Answer» B. Kirchhoff's third rule | |
| 22. |
The equation (I1 + I2 = I3 + 14) satisfies the statement of |
| A. | Kirchhoff's second rule |
| B. | Kirchhoff's first rule |
| C. | Kirchhoff's third rule |
| D. | Kirchhoff's fourth rule |
| Answer» E. | |
| 23. |
The product of voltage and the current is known as |
| A. | work done |
| B. | power |
| C. | velocity |
| D. | acceleration |
| Answer» C. velocity | |
| 24. |
The living creature that turns itself into the living battery is |
| A. | star fish |
| B. | shark |
| C. | eel |
| D. | octopus |
| Answer» D. octopus | |
| 25. |
The characteristic specific resistance of the wire is its |
| A. | conductivity |
| B. | resistivity |
| C. | transitivity |
| D. | both a and b |
| Answer» C. transitivity | |
| 26. |
The voltage of the device having resistance 5 ohm and current 4ampere will be |
| A. | 10V |
| B. | 15V |
| C. | 20V |
| D. | 25V |
| Answer» D. 25V | |
| 27. |
The current voltage graph of the ohmic devices is a |
| A. | linear graph |
| B. | non linear graph |
| C. | parabolic graph |
| D. | hyperbola graph |
| Answer» B. non linear graph | |
| 28. |
The conversion of temperature into electric voltage is done with |
| A. | rheostat |
| B. | resistor |
| C. | thermistor |
| D. | rheostat |
| Answer» D. rheostat | |
| 29. |
The specific resistance of the wire can be measured by the formula |
| A. | R/L |
| B. | RA/L |
| C. | RL/A |
| D. | A/RL |
| Answer» C. RL/A | |
| 30. |
The formula E2/4R is the formula representing |
| A. | power |
| B. | output power |
| C. | max output power |
| D. | resistance |
| Answer» D. resistance | |
| 31. |
Flow of charges in the direction of electrons is called |
| A. | current |
| B. | electronic current |
| C. | conventional current |
| D. | protonic current |
| Answer» C. conventional current | |
| 32. |
The heating effect of electric current is used in |
| A. | electric kettle |
| B. | fan |
| C. | freezer |
| D. | TV |
| Answer» B. fan | |
| 33. |
Current of 0.75A when a battery of 1.5V is connected to the wire of 5m having cross sectional area 2.5 x 10-7 m2 will have the resistivity |
| A. | 1 x 10-7 |
| B. | 1.1 x 10-7 |
| C. | 2 x 10-7 |
| D. | 2.1 x 10-7 |
| Answer» B. 1.1 x 10-7 | |
| 34. |
Thermo couples is the source of current that converts heat energy to |
| A. | chemical energy |
| B. | mechanical energy |
| C. | solar energy |
| D. | electrical energy |
| Answer» E. | |
| 35. |
The rate of flow of charge through cross sectional area is known as |
| A. | current |
| B. | voltage |
| C. | meter |
| D. | acceleration |
| Answer» B. voltage | |
| 36. |
The potential difference of a battery is 2.2V when it is connected across a resistance of 5 ohm, if suddenly the potential difference falls to 1.8V its internal resistance will be |
| A. | 1 ohm |
| B. | 1.1 ohm |
| C. | 2 ohm |
| D. | 2.1 ohm |
| Answer» C. 2 ohm | |
| 37. |
The resistor which is known as heat sensitive resistor is |
| A. | thermistor |
| B. | rheostat |
| C. | capacitor |
| D. | resistor |
| Answer» B. rheostat | |
| 38. |
The gold color of the resistance shows the tolerance upto the |
| A. | 0.01 |
| B. | 0.02 |
| C. | 0.05 |
| D. | 0.1 |
| Answer» D. 0.1 | |
| 39. |
Sunlight is directly converted into electrical energy by using |
| A. | cells |
| B. | solar cells |
| C. | electric generator |
| D. | electrical energy |
| Answer» C. electric generator | |
| 40. |
When the condition R1/R2 = R3/R4 is satisfied the current in the galvanometer of Wheatstone bridge is |
| A. | 1 |
| B. | 0 |
| C. | min |
| D. | max |
| Answer» C. min | |
| 41. |
Wire having resistance of 10 ohm at 0C and 20 ohm at 273C will have the temperature coefficient of |
| A. | 4.66 x 10-3 per K |
| B. | 3.66 x 10-3 per K |
| C. | 3 x 10-3 per K |
| D. | 6.6 x 10-3 per K |
| Answer» C. 3 x 10-3 per K | |
| 42. |
The reciprocal of the resistance is called |
| A. | transmission |
| B. | resistivity |
| C. | inspection |
| D. | conductance |
| Answer» E. | |
| 43. |
Rheostat can also be used as a |
| A. | variable resistor |
| B. | potential divider |
| C. | barometer |
| D. | both a and b |
| Answer» E. | |
| 44. |
The power of the battery in the resistor appears as |
| A. | power consumption |
| B. | power dissipation |
| C. | power resistance |
| D. | both a and b |
| Answer» E. | |
| 45. |
The conversion of chemical energy to electrical energy can be achieved by |
| A. | electric generator |
| B. | solar cells |
| C. | cells |
| D. | both a and b |
| Answer» D. both a and b | |
| 46. |
Ohmic devices are the devices that consequently |
| A. | obey ohms law |
| B. | doesn't obey ohms law |
| C. | violate ohms law |
| D. | satisfy ohms law |
| Answer» B. doesn't obey ohms law | |
| 47. |
When current passing is 300mA then electrons passing through the bulb in one minute are |
| A. | 1.2 x 1020 |
| B. | 2.12 x 1020 |
| C. | 1 x 1020 |
| D. | 1.12 x 1020 |
| Answer» E. | |
| 48. |
The current flowing from higher potential to the lower potential is known as |
| A. | electronic current |
| B. | protonic current |
| C. | current |
| D. | conventional current |
| Answer» E. | |
| 49. |
Filament bulbs are the best examples of the |
| A. | non ohmic devices |
| B. | resistive devices |
| C. | ohmic devices |
| D. | electric devices |
| Answer» B. resistive devices | |
| 50. |
The heating effect produced by current is due to the |
| A. | collision of electrons |
| B. | movement of electrons |
| C. | resistance in electrons |
| D. | lose of energy |
| Answer» B. movement of electrons | |