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.
| 201. |
In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is |
| A. | 33 V |
| B. | 66 V |
| C. | 80 V |
| D. | 132 V |
| Answer» C. 80 V | |
| 202. |
The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is |
| A. | 50 % |
| B. | 60 % |
| C. | 100 % |
| D. | 150 % |
| Answer» B. 60 % | |
| 203. |
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. | 1.2 x 10-8 ω-m |
| B. | 1.4 x 10-8 ω-m |
| C. | 1.6 x 10-8 ω-m |
| D. | 1.8 x 10-8 ω-m |
| Answer» D. 1.8 x 10-8 ω-m | |
| 204. |
Voltage dependent resistors are usually made from |
| A. | Charcoal |
| B. | Silicon carbide |
| C. | Nichrome |
| D. | Graphite |
| Answer» D. Graphite | |
| 205. |
International ohm is defined in terms of the resistance of |
| A. | A column of mercury |
| B. | A cube of carbon |
| C. | A cube of copper |
| D. | The unit length of wire |
| Answer» B. A cube of carbon | |
| 206. |
A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is |
| A. | 400 Q |
| B. | 600 Q |
| C. | 800 Q |
| D. | 1000 Q |
| Answer» D. 1000 Q | |
| 207. |
Which of the following quantities remain the same in all parts of a series circuit? |
| A. | Voltage |
| B. | Current |
| C. | Power |
| D. | Resistance |
| Answer» C. Power | |
| 208. |
When current flows through heater coil it glows but supply wiring does not glow because |
| A. | Current through supply line flows at slower speed |
| B. | Supply wiring is covered with insulation layer |
| C. | Resistance of heater coil is more than the supply wires |
| D. | Supply wires are made of superior material |
| Answer» D. Supply wires are made of superior material | |
| 209. |
Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be |
| A. | 9 times |
| B. | 1/9 times |
| C. | 1/3 times |
| D. | 3 times |
| Answer» C. 1/3 times | |
| 210. |
Which of the following statement is true both for a series and a parallel D.C. circuit? |
| A. | Elements have individual currents |
| B. | Currents are additive |
| C. | Voltages are additive |
| D. | Power are additive |
| Answer» E. | |
| 211. |
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. | Decrease |
| B. | Increase |
| C. | Remain constant |
| D. | None of the above |
| Answer» C. Remain constant | |
| 212. |
Out of the following which is not a poor conductor? |
| A. | Cast iron |
| B. | Copper |
| C. | Carbon |
| D. | Tungsten |
| Answer» C. Carbon | |
| 213. |
The insulation on a current carrying conductor is provided |
| A. | To prevent leakage of current |
| B. | To prevent shock |
| C. | Both of above factors |
| D. | None of above factors |
| Answer» D. None of above factors | |
| 214. |
With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals |
| A. | 10 W |
| B. | 20 W |
| C. | 40 W |
| D. | 60 W |
| Answer» E. | |
| 215. |
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. | 6.4 A, 6.9 A |
| B. | 6.4 A, 9.6 A |
| C. | 4.6 A, 6.9 A |
| D. | 4.6 A, 9.6 A |
| Answer» C. 4.6 A, 6.9 A | |
| 216. |
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. | Length of heating element should be decreased |
| B. | Length of heating element should be increased |
| C. | Length of heating element has no effect on heating if water |
| D. | None of the above |
| Answer» B. Length of heating element should be increased | |
| 217. |
Conductance is reciprocal of |
| A. | Resistance |
| B. | Inductance |
| C. | Reluctance |
| D. | Capacitance |
| Answer» B. Inductance | |
| 218. |
A field of force can exist only between |
| A. | Two molecules |
| B. | Two ions |
| C. | Two atoms |
| D. | Two metal particles |
| Answer» C. Two atoms | |
| 219. |
Which method can be used for absolute measurement of resistances? |
| A. | Lorentz method |
| B. | Raleigh method |
| C. | Ohm's law method |
| D. | Wheatstone bridge method |
| Answer» E. | |
| 220. |
What is the answer to this question? The resistance of a few meters of wire conductor in closed electrical circuit is |
| A. | Practically zero |
| B. | Low |
| C. | High |
| D. | Very high |
| Answer» B. Low | |
| 221. |
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. | I²Rt |
| B. | I²Rt² |
| C. | I²R²t |
| D. | I²R²t² |
| Answer» B. I²Rt² | |
| 222. |
The number of electrons in the outer most orbit of carbon atom is |
| A. | 3 |
| B. | 4 |
| C. | 6 |
| D. | 7 |
| Answer» C. 6 | |
| 223. |
When electric current passes through a metallic conductor, its temperature rises. This is due to |
| A. | Collisions between conduction electrons and atoms |
| B. | The release of conduction electrons from parent atoms |
| C. | Mutual collisions between metal atoms |
| D. | Mutual collisions between conducting electrons |
| Answer» B. The release of conduction electrons from parent atoms | |
| 224. |
Ohm’s law is not applicable to |
| A. | vacuum tubes |
| B. | carbon resistors |
| C. | high voltage circuits |
| D. | circuits with low current densities |
| Answer» B. carbon resistors | |
| 225. |
Ohm's law is not applicable to |
| A. | Semiconductors |
| B. | D.C. circuits |
| C. | Small resistors |
| D. | High currents |
| Answer» B. D.C. circuits | |
| 226. |
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. | 80 m |
| B. | 60 m |
| C. | 40 m |
| D. | 20 m |
| Answer» B. 60 m | |
| 227. |
Out of the following which is an insulating material? |
| A. | Copper |
| B. | Gold |
| C. | Silver |
| D. | Paper |
| Answer» E. | |
| 228. |
If a parallel circuit is opened in the main line, the current |
| A. | Increases in the branch of the lowest resistance |
| B. | Increases in each branch |
| C. | Is zero in all branches |
| D. | Is zero in the highest resistive branch |
| Answer» D. Is zero in the highest resistive branch | |
| 229. |
A substance whose molecules consist of dissimilar atoms is called |
| A. | Semiconductor |
| B. | Super-conductor |
| C. | Compound |
| D. | Insulator |
| Answer» D. Insulator | |
| 230. |
When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is |
| A. | A.C. |
| B. | D.C. |
| C. | Any of above two |
| D. | None of the above |
| Answer» C. Any of above two | |
| 231. |
Insulating materials have the function of |
| A. | Preventing a short circuit between conducting wires |
| B. | Preventing an open circuit between the voltage source and the load |
| C. | Conducting very large currents |
| D. | Storing very high currents |
| Answer» C. Conducting very large currents | |
| 232. |
A glass rod when rubbed with silk cloth is charged because |
| A. | It takes in proton |
| B. | Its atoms are removed |
| C. | It gives away electrons |
| D. | It gives away positive charge |
| Answer» D. It gives away positive charge | |
| 233. |
The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true? |
| A. | The current through each bulb in same |
| B. | The voltage across each bulb is not same |
| C. | The power dissipation in each bulb is not same |
| D. | None of the above |
| Answer» B. The voltage across each bulb is not same | |
| 234. |
Switching of a lamp in house produces noise in the radio. This is because switching operation produces |
| A. | Arcs across separating contacts |
| B. | Mechanical noise of high intensity |
| C. | Both mechanical noise and arc between contacts |
| D. | None of the above |
| Answer» B. Mechanical noise of high intensity | |
| 235. |
Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel.The total resistance of the combination is |
| A. | 5 ohms |
| B. | 10 ohms |
| C. | 15 ohms |
| D. | 55 ohms |
| Answer» B. 10 ohms | |
| 236. |
The ratio of mass of proton to that of electron is nearly |
| A. | 1840 |
| B. | 1480 |
| C. | 30 |
| D. | 4 |
| Answer» B. 1480 | |
| 237. |
The substances which have a large number of free electrons and offer a low resistance are called |
| A. | Insulators |
| B. | Inductors |
| C. | Semiconductors |
| D. | Conductors |
| Answer» E. | |
| 238. |
The property of a conductor due to which it passes current is called |
| A. | Resistance |
| B. | Reluctance |
| C. | Conductance |
| D. | Inductance |
| Answer» D. Inductance | |
| 239. |
Which one of the following does not have negative temperature coefficient? |
| A. | Aluminium |
| B. | Paper |
| C. | Rubber |
| D. | Mica |
| Answer» B. Paper | |
| 240. |
Which of the following can have negative temperature coefficient? |
| A. | Compounds of silver |
| B. | Liquid metals |
| C. | Metallic alloys |
| D. | Electrolytes |
| Answer» E. | |
| 241. |
The condition for the validity under Ohm's law is that |
| A. | Resistance must be uniform |
| B. | Current should be proportional to the size of the resistance |
| C. | Resistance must be wire wound type |
| D. | Temperature at positive end should be more than the temperature at negative end |
| Answer» B. Current should be proportional to the size of the resistance | |
| 242. |
The condition for the validity under Ohm’s law is that |
| A. | resistance must be uniform |
| B. | current should be proportional to the size of the resistance |
| C. | resistance must be wire wound type |
| D. | temperature at positive end should be more than the temperature at negative end |
| Answer» B. current should be proportional to the size of the resistance | |
| 243. |
Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be |
| A. | 160 ohms |
| B. | 80 ohms |
| C. | 20 ohms |
| D. | 10 ohms |
| Answer» E. | |
| 244. |
For which of the following 'ampere second' could be the unit? |
| A. | Reluctance |
| B. | Charge |
| C. | Power |
| D. | Energy |
| Answer» C. Power | |
| 245. |
Current velocity through a copper conductor is |
| A. | the same as propagation velocity of electric energy |
| B. | independent of current strength |
| C. | of the order of a few ^.s/m |
| D. | nearly 3 x 108 m/s |
| Answer» D. nearly 3 x 108 m/s | |
| 246. |
The minimum charge on an ion is |
| A. | Equal to the atomic number of the atom |
| B. | Equal to the charge of an electron |
| C. | Equal to the charge of the number of electrons in an atom (#) zero |
| D. | None of these |
| Answer» C. Equal to the charge of the number of electrons in an atom (#) zero | |
| 247. |
The rating of a fuse wire is always expressed in |
| A. | Ampere-hours |
| B. | Ampere-volts |
| C. | kWh |
| D. | Amperes |
| Answer» E. | |
| 248. |
Resistance of a material always decreases if |
| A. | Temperature of material is decreased |
| B. | Temperature of material is increased |
| C. | Number of free electrons available becomes more |
| D. | None of the above is correct |
| Answer» D. None of the above is correct | |
| 249. |
For a ‘ d ‘ electron , the orbital angular momentum is |
| A. | √6 h |
| B. | √2 h |
| C. | h |
| D. | 2 h |
| Answer» B. √2 h | |
| 250. |
An atom has four unpaired electrons. The total spin of this atom will be |
| A. | 1 |
| B. | 1.5 |
| C. | 2 |
| D. | 4 |
| Answer» D. 4 | |