MCQOPTIONS
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MCQOPTIONS
This section includes 114 Mcqs, each offering curated multiple-choice questions to sharpen your BITSAT knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct? |
| A. | 00 W lamp will glow brighter |
| B. | 0 W lamp will glow brighter |
| C. | oth lamps will glow equally bright |
| D. | 0 W lamp will fuse |
| Answer» C. oth lamps will glow equally bright | |
| 2. |
With rise in temperature the resistance of pure metals |
| A. | ncreases |
| B. | ecreases |
| C. | irst increases and then decreases |
| D. | emains constant |
| Answer» B. ecreases | |
| 3. |
Temperature coefficient of resistance is expressed in terms of |
| A. | hms/°C |
| B. | hos/ohm°C |
| C. | hms/ohm°C |
| D. | hos/°C |
| Answer» D. hos/°C | |
| 4. |
Varistors are |
| A. | nsulators |
| B. | onlinear resistors |
| C. | arbon resistors |
| D. | esistors with zero temperature coefficients |
| Answer» C. arbon resistors | |
| 5. |
Whether circuit may be AC. or D.C. one, following is most effective in reducing the magnitude of the current. |
| A. | eactor |
| B. | apacitor |
| C. | nductor |
| D. | esistor |
| Answer» E. | |
| 6. |
One Newton meter is same as |
| A. | ne watt |
| B. | ne joule |
| C. | ive joules |
| D. | ne joule second |
| Answer» C. ive joules | |
| 7. |
Electric current passing through the circuit produces |
| A. | agnetic effect |
| B. | uminous effect |
| C. | hermal effect |
| D. | hemical effect |
| Answer» D. hemical effect | |
| 8. |
If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes |
| A. | .4 ohm |
| B. | .6 ohm |
| C. | .8 ohm |
| D. | .0 ohm |
| Answer» B. .6 ohm | |
| 9. |
In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is |
| A. | 3 V |
| B. | 6 V |
| C. | 0 V |
| D. | 32 V |
| Answer» C. 0 V | |
| 10. |
The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is |
| A. | 0 % |
| B. | 0 % |
| C. | 00 % |
| D. | 50 % |
| Answer» B. 0 % | |
| 11. |
The resistance of a copper wire 200 m long is 21 ω. If its thickness (diameter) is 0.44 mm, its specific resistance is around |
| A. | .2 x 10-8 ω-m |
| B. | .4 x 10-8 ω-m |
| C. | .6 x 10-8 ω-m |
| D. | .8 x 10-8 ω-m |
| Answer» D. .8 x 10-8 ω-m | |
| 12. |
The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other? |
| A. | 8 Q |
| B. | 6 Q |
| C. | 8 Q |
| D. | 4 Q |
| Answer» C. 8 Q | |
| 13. |
A 3 Q resistor having 2 A current will dissipate the power of |
| A. | watts |
| B. | watts |
| C. | watts |
| D. | watts |
| Answer» D. watts | |
| 14. |
International ohm is defined in terms of the resistance of |
| A. | column of mercury |
| B. | cube of carbon |
| C. | cube of copper |
| D. | he unit length of wire |
| Answer» B. cube of carbon | |
| 15. |
A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is |
| A. | 00 Q |
| B. | 00 Q |
| C. | 00 Q |
| D. | 000 Q |
| Answer» D. 000 Q | |
| 16. |
Which of the following quantities remain the same in all parts of a series circuit? |
| A. | oltage |
| B. | urrent |
| C. | ower |
| D. | esistance |
| Answer» C. ower | |
| 17. |
Which of the following statement is true both for a series and a parallel D.C. circuit? |
| A. | lements have individual currents |
| B. | urrents are additive |
| C. | oltages are additive |
| D. | ower are additive |
| Answer» E. | |
| 18. |
When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will |
| A. | ecrease |
| B. | ncrease |
| C. | emain constant |
| D. | one of the above |
| Answer» C. emain constant | |
| 19. |
Out of the following which is not a poor conductor? |
| A. | ast iron |
| B. | opper |
| C. | arbon |
| D. | ungsten |
| Answer» C. arbon | |
| 20. |
A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is |
| A. | .4 A, 6.9 A |
| B. | .4 A, 9.6 A |
| C. | .6 A, 6.9 A |
| D. | .6 A, 9.6 A |
| Answer» C. .6 A, 6.9 A | |
| 21. |
In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains |
| A. | ength of heating element should be decreased |
| B. | ength of heating element should be increased |
| C. | ength of heating element has no effect on heating if water |
| D. | one of the above |
| Answer» B. ength of heating element should be increased | |
| 22. |
Conductance is reciprocal of |
| A. | esistance |
| B. | nductance |
| C. | eluctance |
| D. | apacitance |
| Answer» B. nductance | |
| 23. |
Resistance of carbon filament lamp as the applied voltage increases. |
| A. | ncreases |
| B. | ecreases |
| C. | emains same |
| D. | one of the above |
| Answer» C. emains same | |
| 24. |
Heat in a conductor is produced on the passage of electric current due to |
| A. | eactance |
| B. | apacitance |
| C. | mpedance |
| D. | esistance |
| Answer» E. | |
| 25. |
Which is the best conductor of electricity? |
| A. | ron |
| B. | ilver |
| C. | opper |
| D. | arbon |
| Answer» C. opper | |
| 26. |
What will be energy used by the battery if the battery has to drive 6.28 x 10¹⁸ electrons with potential difference of 20 V across the terminal ? |
| A. | joules |
| B. | 0 joules |
| C. | 5 joules |
| D. | 0 joules |
| Answer» E. | |
| 27. |
Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners? |
| A. | /2 Q |
| B. | Q |
| C. | Q |
| D. | /3 Q |
| Answer» D. /3 Q | |
| 28. |
Resistance of a tungsten lamp as applied voltage increases |
| A. | ecreases |
| B. | ncreases |
| C. | emains same |
| D. | one of the above |
| Answer» C. emains same | |
| 29. |
When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is |
| A. | n-mho |
| B. | 06 mho |
| C. | milli-mho |
| D. | one of the above |
| Answer» B. 06 mho | |
| 30. |
With rise in temperature the resistance of semiconductors |
| A. | ecreases |
| B. | ncreases |
| C. | irst increases and then decreases |
| D. | emains constant |
| Answer» B. ncreases | |
| 31. |
An electric filament bulb can be worked from |
| A. | .C. supply only |
| B. | .C. supply only |
| C. | attery supply only |
| D. | ll above |
| Answer» E. | |
| 32. |
The thickness of insulation provided on the conductor depends on |
| A. | he magnitude of voltage on the conductor |
| B. | he magnitude of current flowing through it |
| C. | oth (A) and (B) |
| D. | one of the above |
| Answer» B. he magnitude of current flowing through it | |
| 33. |
Conductance: mho :: |
| A. | esistance : ohm |
| B. | apacitance : Henry |
| C. | nductance : farad |
| D. | umen : steradian |
| Answer» B. apacitance : Henry | |
| 34. |
Which of the following material has nearly zero temperature coefficient of resistance? |
| A. | anganin |
| B. | orcelain |
| C. | arbon |
| D. | opper |
| Answer» B. orcelain | |
| 35. |
All of the following are equivalent to watt except |
| A. | Amperes) ohm |
| B. | oules/sec. |
| C. | mperes × volts |
| D. | mperes/volt |
| Answer» E. | |
| 36. |
A thermistor has |
| A. | ositive temperature coefficient |
| B. | egative temperature coefficient |
| C. | ero temperature coefficient |
| D. | ariable temperature coefficient |
| Answer» D. ariable temperature coefficient | |
| 37. |
The S.I. unit of power is |
| A. | enry |
| B. | oulomb |
| C. | att |
| D. | att-hour |
| Answer» D. att-hour | |
| 38. |
If the efficiency of a machine is to be high, what should be low? |
| A. | nput power |
| B. | osses |
| C. | rue component of power |
| D. | Wh consumed |
| Answer» C. rue component of power | |
| 39. |
A resistance having rating 10 ohms, 10 W is likely to be a |
| A. | etallic resistor |
| B. | arbon resistor |
| C. | ire wound resistor |
| D. | ariable resistor |
| Answer» D. ariable resistor | |
| 40. |
The resistance of a conductor varies inversely as |
| A. | ength |
| B. | rea of cross-section |
| C. | emperature |
| D. | esistivity |
| Answer» C. emperature | |
| 41. |
A rheostat differs from potentiometer in the respect that it |
| A. | as lower wattage rating |
| B. | as higher wattage rating |
| C. | as large number of turns |
| D. | ffers large number of tapping |
| Answer» C. as large number of turns | |
| 42. |
For testing appliances, the wattage of test lamp should be |
| A. | ery low |
| B. | ow |
| C. | igh |
| D. | ny value |
| Answer» D. ny value | |
| 43. |
Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as |
| A. | : 25 |
| B. | 5 : 4 |
| C. | : 5 |
| D. | : 2 |
| Answer» D. : 2 | |
| 44. |
A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will: |
| A. | ecrease |
| B. | ncrease |
| C. | emain same |
| D. | eater will burn out |
| Answer» C. emain same | |
| 45. |
A closed switch has a resistance of |
| A. | ero |
| B. | bout 50 ohms |
| C. | bout 500 ohms |
| D. | nfinity |
| Answer» B. bout 50 ohms | |
| 46. |
Two resistances Rl and Ri are connected in series across the voltage source where Rl > Ri. The largest drop will be across |
| A. | l |
| B. | i |
| C. | ither Rl or Ri |
| D. | one of them |
| Answer» B. i | |
| 47. |
What is the answer to this question? The resistance of a few meters of wire conductor in closed electrical circuit is |
| A. | ractically zero |
| B. | ow |
| C. | igh |
| D. | ery high |
| Answer» B. ow | |
| 48. |
If I, R and t are the current, resistance and time respectively, then according to Joule’s law heat produced will be proportional to |
| A. | ²Rt |
| B. | ²Rt² |
| C. | ²R²t |
| D. | ²R²t² |
| Answer» B. ²Rt² | |
| 49. |
When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is |
| A. | .C. |
| B. | .C. |
| C. | ny of above two |
| D. | one of the above |
| Answer» C. ny of above two | |
| 50. |
Insulating materials have the function of |
| A. | reventing a short circuit between conducting wires |
| B. | reventing an open circuit between the voltage source and the load |
| C. | onducting very large currents |
| D. | toring very high currents |
| Answer» C. onducting very large currents | |