MCQOPTIONS
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MCQOPTIONS
This section includes 39 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Three equal resistors connected in series with a source of e m f together dissipate 10 W of power each. What will be the power dissipated if the same resistors are connected in parallel across the same source of e m f? |
| A. | 40 W |
| B. | 90W |
| C. | 100W |
| D. | 120W |
| Answer» C. 100W | |
| 2. |
All electrical appliances are connected in parallel to each other between the main line and neutral wire to get |
| A. | Same current |
| B. | Same current and potential difference |
| C. | Different current but same potential difference |
| D. | Different current and potential differences |
| Answer» D. Different current and potential differences | |
| 3. |
A neon flashlight cell with an emf of 1.5V gives a current of 15A when connected directly to an ammeter of resistance 0.04?. Internal resistance of the cell is |
| A. | 0.0004? |
| B. | 0.06? |
| C. | 0.10? |
| D. | 0.13? |
| Answer» C. 0.10? | |
| 4. |
When same current passes for same time through a thick and thin wire |
| A. | More heat is produced in thick wire |
| B. | More heat is produced in thin wire |
| C. | No heat is produced in wire |
| D. | Less heat is produced in thick wire |
| Answer» C. No heat is produced in wire | |
| 5. |
A fuse is placed in series with the cireuit to protect against |
| A. | High power |
| B. | High voltage |
| C. | High current |
| D. | Over heating |
| Answer» E. | |
| 6. |
A wire having very high value of conductance is said to be |
| A. | Very good conductor |
| B. | Moderately good conductor |
| C. | An insulator |
| D. | No specific criterion available |
| Answer» B. Moderately good conductor | |
| 7. |
When 2? 4? and 6? resistor are connected in parallel their resultant equivalent resistance will be |
| A. | 12? |
| B. | 11/12? |
| C. | 12/11? |
| D. | Data is insufficient |
| Answer» D. Data is insufficient | |
| 8. |
An electric iron is marked 20 volts 500W. The units consumed by it in using if for 24 hours will be |
| A. | 12 |
| B. | 24 |
| C. | 5 |
| D. | 1100 |
| Answer» B. 24 | |
| 9. |
A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part |
| A. | Remains the same |
| B. | Is doubled |
| C. | Is halved |
| D. | Becomes zero |
| Answer» B. Is doubled | |
| 10. |
Thermocouples convert |
| A. | Heat energy into electrical energy |
| B. | Heat energy into light energy |
| C. | Heat energy into mechanical energy |
| D. | Mechanical energy into heat energy |
| Answer» B. Heat energy into light energy | |
| 11. |
Three bulbs are rating 40W 60W and 100W designed to work on 220V mains. Which bulb will burn most brightly if they are connected in series across 220 V mains? |
| A. | 40 W bulb |
| B. | 60 W blub |
| C. | 100 W blub |
| D. | All will burn equally brightly |
| Answer» B. 60 W blub | |
| 12. |
Which one is the best material for making connecting wires? |
| A. | Iron |
| B. | Tungsten |
| C. | Silver |
| D. | Copper |
| Answer» E. | |
| 13. |
Which one of the following materials is useful for making bulb filaments? |
| A. | Constantan |
| B. | Nichrome |
| C. | Copper |
| D. | Tungsten |
| Answer» B. Nichrome | |
| 14. |
One kilowatt hour is the amount of energy delivered during |
| A. | One second |
| B. | One day |
| C. | One minute |
| D. | One hour |
| Answer» E. | |
| 15. |
Production of heat due to an electric current flowing through a conductor is given by |
| A. | Joule effect |
| B. | Joule Thomsons effect |
| C. | Comptons effect |
| D. | Feed back effect |
| Answer» B. Joule Thomsons effect | |
| 16. |
Which one of the following bulbs has the least resistance? |
| A. | 100 watt |
| B. | 200 watt |
| C. | 300 watt |
| D. | 60 watt |
| Answer» D. 60 watt | |
| 17. |
Why should a resistance be introduced in a circuit in series deliberately? |
| A. | To increase current |
| B. | To decrease current |
| C. | To control current |
| D. | Just to give a good look to circuit |
| Answer» C. To control current | |
| 18. |
Reciprocal of resistivity is called |
| A. | Resistance |
| B. | Inductance |
| C. | Conductivity |
| D. | Flexibility |
| Answer» D. Flexibility | |
| 19. |
Resistance of a conductor depends upon |
| A. | Nature of conductor |
| B. | Dimension of conductor |
| C. | Physical state of the conductor |
| D. | All of above |
| Answer» E. | |
| 20. |
Resistance between points A and B in the circuit shown in figure is |
| A. | 4? |
| B. | 6? |
| C. | 10? |
| D. | 8? |
| Answer» D. 8? | |
| 21. |
Resistance of a super conductor is |
| A. | Finite |
| B. | Infinite |
| C. | Zero |
| D. | Changes with every conductor |
| Answer» D. Changes with every conductor | |
| 22. |
Resistance of a wire on increasing its temperature will |
| A. | Increase with rise in temperature |
| B. | Decrease with rise in temperature |
| C. | Will remain same |
| D. | Depends upon altitude of experimentation |
| Answer» B. Decrease with rise in temperature | |
| 23. |
Resistance of an ideal insulator is |
| A. | Infinite |
| B. | Zero |
| C. | Finite |
| D. | Depends upon nature |
| Answer» B. Zero | |
| 24. |
Terminal potential difference of a battery is greater than its emf when |
| A. | The internal resistance of battery is infinite |
| B. | The internal resistance of battery is zero |
| C. | The battery is charged |
| D. | The battery is discharged |
| Answer» D. The battery is discharged | |
| 25. |
Specific resistance of a wire |
| A. | Will depend on its length |
| B. | Will depend on its radius |
| C. | Will depend on the type of material of the wire |
| D. | Will depend on none of the above |
| Answer» D. Will depend on none of the above | |
| 26. |
The current in the circuit shown in figure What will be the current in the circuit? |
| A. | 1/45A |
| B. | 1/10A |
| C. | 1/5A |
| D. | 5A |
| Answer» C. 1/5A | |
| 27. |
The current through a metallic conductor is due to the motion of |
| A. | Free electrons |
| B. | Protons |
| C. | Neutrons |
| D. | Still under controversy |
| Answer» B. Protons | |
| 28. |
The graphical representation of Ohms law is |
| A. | Hyperbola |
| B. | Ellipse |
| C. | Parabola |
| D. | Straight line |
| Answer» E. | |
| 29. |
The resistance of a conductor at absolute zero (OK) is |
| A. | Zero almost |
| B. | Infinite almost |
| C. | No prediction at all |
| D. | May increase or decrease |
| Answer» B. Infinite almost | |
| 30. |
There are three bulbs of 60W 100W and 200W which bulb has thickest filament. |
| A. | 100W |
| B. | 200W |
| C. | 60W |
| D. | All |
| Answer» C. 60W | |
| 31. |
An immersion heater of 400 watts kept on for 5 hours will consume electrical power of |
| A. | 2KWh |
| B. | 20KWh |
| C. | 6KWh |
| D. | 12KWh |
| Answer» B. 20KWh | |
| 32. |
Circuit which gives continuously varying potential is called |
| A. | Complex network |
| B. | Wheat stone bridge |
| C. | Potential divider |
| D. | All of above |
| Answer» D. All of above | |
| 33. |
Electrical energy is converted to heat at the rate of |
| A. | IRt |
| B. | I2R |
| C. | I2Rt |
| D. | VIt |
| Answer» C. I2Rt | |
| 34. |
Electrical energy is measured in |
| A. | Watt |
| B. | Horse power |
| C. | Kilo watt |
| D. | Kilowatt hour |
| Answer» E. | |
| 35. |
How much heat does a 40 W bulb generates in one hour? |
| A. | 144000J |
| B. | 144J |
| C. | 1.44J |
| D. | 14J |
| Answer» B. 144J | |
| 36. |
If 1 ampere current flows through 2m long conductor the charge flow through it in 1 hour will be |
| A. | 3600C |
| B. | 7200C |
| C. | 1C |
| D. | 2C |
| Answer» B. 7200C | |
| 37. |
In liquids and gases the current is due to the motion |
| A. | Negative charges |
| B. | Positive charges |
| C. | Both negative and positive charges |
| D. | Neutral particles |
| Answer» D. Neutral particles | |
| 38. |
In the following figure, the terminal potential is |
| A. | Zero |
| B. | 2V |
| C. | 12V |
| D. | 36V |
| Answer» B. 2V | |
| 39. |
Internal resistance is the resistance offered by |
| A. | Source of e m f |
| B. | Conductor |
| C. | Resistor |
| D. | Capacitor |
| Answer» B. Conductor | |