MCQOPTIONS
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MCQOPTIONS
This section includes 301 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
Two electric fans p and 2 p watt respectively are connected in series. What is the power of the combination in watt ? |
| A. | p |
| B. | 3 p |
| C. | 2p / 3 |
| D. | 3 p / 2 |
| Answer» D. 3 p / 2 | |
| 252. |
A superconductor exhibits |
| A. | Paramagnetism |
| B. | Diamagnetism |
| C. | Ferromagnetism |
| D. | Ferrimagnetism |
| Answer» C. Ferromagnetism | |
| 253. |
Which one of the following non-metals in not a poor conductor of electricity ? |
| A. | Sulphur |
| B. | Selenium |
| C. | Bromine |
| D. | Phosphorus |
| Answer» C. Bromine | |
| 254. |
The deflection in moving coil galvanometer is |
| A. | Directly proportional to the torsional constant |
| B. | Inversely proportional to the area of the coil |
| C. | Inversely proportional to the current |
| D. | Directly proportional to the number of turns in the coil |
| Answer» E. | |
| 255. |
A moving charged is subjected to an external magnetic field. The change in the kinetic energy of the particle |
| A. | Increases with the increase in the field strength |
| B. | Decreases with the increase in the field strength |
| C. | Is always zero |
| D. | Depends upon whether the field is uniform or non-uniform |
| Answer» D. Depends upon whether the field is uniform or non-uniform | |
| 256. |
What is the difference between a CFL and an LED LAMP ? |
| A. | 1 only |
| B. | 2 and 3 |
| C. | 1 and 3 |
| D. | 1, 2 and 3 |
| Answer» D. 1, 2 and 3 | |
| 257. |
In electric supply lines in India, Which parameter is kept constant? |
| A. | Voltage |
| B. | Current |
| C. | Frequency |
| D. | Power |
| Answer» D. Power | |
| 258. |
A suitable unit for expressing electric field strength is |
| A. | V / C |
| B. | A - m |
| C. | C / m |
| D. | <sup>2</sup> |
| E. | N / C |
| Answer» E. N / C | |
| 259. |
What is the maximum number of different electrical combination possible with equal resistances? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 260. |
Two charges of 1 C an 5 C are placed at some distance in air. The ratio of the forces acting on them is |
| A. | 1 : 25 |
| B. | 1 : 5 |
| C. | 1 : 1 |
| D. | 5 : 1 |
| Answer» D. 5 : 1 | |
| 261. |
An electric fan and heater are marked as 100 W and 220 V and 1000 W and 220 V respectively. The resistance of heater is |
| A. | Zero |
| B. | Greater than that of the fan |
| C. | Lesser than that of than |
| D. | Equal to than of fan |
| Answer» D. Equal to than of fan | |
| 262. |
The filament of bulb is of |
| A. | Mercury |
| B. | Copper |
| C. | Tungsten |
| D. | None of these |
| Answer» D. None of these | |
| 263. |
As the electric charge on the surface of a hollow metal sphere increases, the electric field intensity inside the sphere |
| A. | Decrease |
| B. | Increase |
| C. | Remains the same |
| D. | None of these |
| Answer» D. None of these | |
| 264. |
The electric field due to point charge at a distance R form it is E. If the same charge is placed on a metallic sphere of Radius R, the electric field on the surface of the sphere will be |
| A. | zero |
| B. | E / 2 |
| C. | E |
| D. | 2 E |
| Answer» D. 2 E | |
| 265. |
A steady current is flowing is flowing in a conductor of non-uniform cross-section. The charge passing through and cross-section per unit time is |
| A. | Directly proportional to the area of cross-section |
| B. | Inversely proportional to the area of cross-section |
| C. | Proportional to square of the area of cross-section |
| D. | Independent of the area of cross-section |
| Answer» E. | |
| 266. |
Four wires of same material and of dimensions as mentioned below are stretched by a load of same magnitude separately. Which one of them will be elongated maximum? |
| A. | Wire of 1 m length and 2 mm diameter |
| B. | Wire of 2 m length and 2 mm diameter |
| C. | Wire of 5 m length and 105 mm diameter |
| D. | Wire of 1 m length and 1 mm diameter |
| Answer» D. Wire of 1 m length and 1 mm diameter | |
| 267. |
The terminal potential difference of a battery exceeds its emf. When it is connected |
| A. | In parallel with a battery of higher emf. |
| B. | In series with a battery of higher emf. |
| C. | In series with a battery of lower emf. |
| D. | In parallel with battery of lower emf |
| Answer» B. In series with a battery of higher emf. | |
| 268. |
If a bar magnet is cut length wise into 3 parts, the total number of poles will be |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6 |
| Answer» E. | |
| 269. |
The wire having black plastic covering is a |
| A. | Line wire |
| B. | Neutral wire |
| C. | Earth wire |
| D. | None of these |
| Answer» C. Earth wire | |
| 270. |
When the hot and cold junctions of a thermocouple are interchanged the theromo-emf |
| A. | Becomes zero |
| B. | Becomes double |
| C. | Remains same |
| D. | Changes sign |
| Answer» E. | |
| 271. |
If the length of a wire is doubled and its cross section is also doubled, then its resistance will |
| A. | Become one fourth |
| B. | Become four times |
| C. | Become two times |
| D. | Remain unchanged |
| Answer» E. | |
| 272. |
The resistance of a wire is R, It is stretched uniformly so that its length is doubled. The resistance now becomes |
| A. | 2 R |
| B. | R / 2 |
| C. | 4 R |
| D. | R / 4 |
| Answer» D. R / 4 | |
| 273. |
Magnetic effect of current was discovered by |
| A. | Faraday |
| B. | Oersted |
| C. | Kirchhoff |
| D. | Joule |
| Answer» C. Kirchhoff | |
| 274. |
Two electric bulbs whose resistances are in the ratio 1 : 2 are connected in parallel to a constant voltage source. the power dissipated in them have the ratio |
| A. | 1 : 2 |
| B. | 1 : 1 |
| C. | 2 : 1 |
| D. | 1 : 4 |
| Answer» D. 1 : 4 | |
| 275. |
The capacity of a pure capacitor is 1 farad. In D.C. circuit, its effective resistance will be |
| A. | Zero |
| B. | Infinite |
| C. | 1 ohm |
| D. | 1 / 2 ohm |
| Answer» C. 1 ohm | |
| 276. |
Potentiometer measures potential more accurately because |
| A. | It measures potential in the closed circuit |
| B. | It measures potential in the open circuit |
| C. | It uses high resistance potential in the open circuit |
| D. | None of the above |
| Answer» C. It uses high resistance potential in the open circuit | |
| 277. |
To make the field radial in moving coil galvanometer |
| A. | The number of turns in the coil is increased |
| B. | Poles are cylindrically cut |
| C. | Magnet is taken in the form of horse shoe |
| D. | Coil is wound an aluminium frame |
| Answer» C. Magnet is taken in the form of horse shoe | |
| 278. |
The EMF of the Daniel cell is |
| A. | 0.56 V |
| B. | 1.12 V |
| C. | 2.56 V |
| D. | 3.12 V |
| Answer» C. 2.56 V | |
| 279. |
Constantan wire is used in making standard resistance because its |
| A. | Melting point is high |
| B. | Density is high |
| C. | Specific resistance is low |
| D. | Temperature coefficient of resistance is negligible |
| Answer» E. | |
| 280. |
Metals are good conductor of heat than insulator because |
| A. | Their atoms are relatively apart |
| B. | They contain free electrons |
| C. | They have reflecting surface |
| D. | None of the above |
| Answer» C. They have reflecting surface | |
| 281. |
If the electric current in a lamp decreases by 5% then the power output decreases by |
| A. | 25% |
| B. | 10% |
| C. | 5% |
| D. | 20% |
| Answer» C. 5% | |
| 282. |
Five bulbs each rated as 220V 100 W burnt 4 hours. What is the cost of electricity consumed it the rate is 50 paise per unit? |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| Answer» B. 2 | |
| 283. |
A carbon microphone is best used in a |
| A. | Dynamo |
| B. | Telephone |
| C. | Transformer |
| D. | None of these |
| Answer» C. Transformer | |
| 284. |
A moving charge produces |
| A. | An electric field only |
| B. | A magnetic field only |
| C. | Both electric and magnetic fields |
| D. | Neither an electric nor a magnetic field |
| Answer» D. Neither an electric nor a magnetic field | |
| 285. |
Curie temperature of iron is the temperature below which it is |
| A. | Superconducting |
| B. | Radioactive |
| C. | Ferromagnetic |
| D. | Diamagnetic |
| Answer» D. Diamagnetic | |
| 286. |
The vertical component of earth's magnetic field is zero |
| A. | 0 |
| B. | 45 |
| C. | 60 |
| D. | 90 |
| Answer» B. 45 | |
| 287. |
No force is exerted by magnetic field on a stationary |
| A. | Electric dipole |
| B. | Magnetic dipole |
| C. | Current loop |
| D. | None of these |
| Answer» B. Magnetic dipole | |
| 288. |
Magnetic dipole moment is a vector quantity directed from |
| A. | South to north |
| B. | North to south |
| C. | East to west |
| D. | West to east |
| Answer» B. North to south | |
| 289. |
In a dry cell (battery), which of the following are used a electrolytes? |
| A. | Ammonium chloride and zine chloride |
| B. | Sodium chloride and calcium chloride |
| C. | Magnesium chloride and zinc chloride |
| D. | Ammonium chloride and calcium chloride |
| Answer» B. Sodium chloride and calcium chloride | |
| 290. |
Consider the following statements regarding electric fuse wire |
| A. | 1 only |
| B. | 1 and 3 |
| C. | 1 and 2 |
| D. | 2 and 3 |
| Answer» B. 1 and 3 | |
| 291. |
In the case of a bar magnet, the line of magnetic induction |
| A. | Start from the north pole and end at the south pole |
| B. | Run continuously through the bar and outside |
| C. | Emerge in circular paths from the middle of the bar |
| D. | None of the above |
| Answer» C. Emerge in circular paths from the middle of the bar | |
| 292. |
A large magnet is broken into two pieces. If lengths of two pieces are in the ratio of 3 : 4 what is the ratio of their pole strengths? |
| A. | 3 : 4 |
| B. | 4 : 3 |
| C. | 1 : 1 |
| D. | 3 : 2 |
| Answer» D. 3 : 2 | |
| 293. |
Magnetic permeability is maximum for |
| A. | Diamagnetic substances |
| B. | Paramagnetic substances |
| C. | Ferromagnetic substances |
| D. | All of the above |
| Answer» D. All of the above | |
| 294. |
The susceptibility of diamagnetic material |
| A. | Decreases with temperature |
| B. | Does not vary with temperature |
| C. | Increases with temperature |
| D. | None of the above |
| Answer» C. Increases with temperature | |
| 295. |
Order to increases the current sensitivity of a moving coil galvanometer the |
| A. | Number of turns of the coil should be icreased |
| B. | Strength of the magnetic field should be increased |
| C. | Area of the coil should be increased |
| D. | All of the above |
| Answer» E. | |
| 296. |
A charged particle is moving with velocity V in magnetic field of induction B. The force on the particle will be maximum when |
| A. | V and B are in same direction |
| B. | V and B are opposite direction |
| C. | V and B are perpendicular |
| D. | None of the above |
| Answer» D. None of the above | |
| 297. |
If a material, placed in a magnetic field is thrown out of it, then the material is |
| A. | Non-magnetic |
| B. | Ferromagnetic |
| C. | Diamagnetic |
| D. | Paramagnetic |
| Answer» D. Paramagnetic | |
| 298. |
The electric current passing through a metallic wire produces heat because of |
| A. | Collision of conduction electrons with each other |
| B. | Collision of the atoms of the metal with each other |
| C. | Collision of the conduction electrons with the atoms of the metallic wire |
| D. | None of the above |
| Answer» D. None of the above | |
| 299. |
A point charge is brought in an electric. The field at a nearby point |
| A. | May increase if the charge is positive |
| B. | May decrease if the charge is negative |
| C. | Both (a) and (b) |
| D. | None of the above |
| Answer» D. None of the above | |
| 300. |
A proton, when accelerated through a potential difference of V volts, has an associated wavelength, an a-particle must be accelerated through a potential difference of |
| A. | V volts |
| B. | 4 V volts |
| C. | 2 V volts |
| D. | V / 8 volts |
| Answer» E. | |