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.
| 151. |
A hollow metal sphere of radius 5 cm is charged so that the potential on its surface is 10 V. The potential at the centre of sphere is |
| A. | Zero |
| B. | 10 V |
| C. | More than 10 V |
| D. | None of these |
| Answer» C. More than 10 V | |
| 152. |
The potential inside a hollow spherical conductor |
| A. | Is constant |
| B. | Varies directly as the distance from the centre |
| C. | Varies inversely as the distance from the centre |
| D. | None of the above |
| Answer» B. Varies directly as the distance from the centre | |
| 153. |
A hollow sphere of copper is positively charged. Then the electric field inside the sphere is |
| A. | The same as the field at the surface |
| B. | Greater than the field at the surface |
| C. | Less than the field at the surface but not zero |
| D. | Zero |
| Answer» E. | |
| 154. |
The relative permeability of a diamagnetic material is |
| A. | Greater than unity |
| B. | Less than unity |
| C. | Equal to unity |
| D. | Negative |
| Answer» C. Equal to unity | |
| 155. |
A galvanometer is converted into an ammeter when we connect a |
| A. | High resistance in series |
| B. | High resistance in parallel |
| C. | Low resistance in series |
| D. | Low resistance in parallel |
| Answer» E. | |
| 156. |
Faraday's law of electromagnetic induction is related to the |
| A. | Law of conservation of charge |
| B. | Law of conservation of energy |
| C. | Third law of motion |
| D. | None of the above |
| Answer» C. Third law of motion | |
| 157. |
Two concentric metallic spherical shells are given positive charges then |
| A. | The quarter sphere is always at a higher potential |
| B. | The inner sphere is always at a higher potential |
| C. | Both the spheres are at the same potential |
| D. | None of the above |
| Answer» C. Both the spheres are at the same potential | |
| 158. |
Two charges are placed at a distance apart. If a glass slab is placed between them, force between them will |
| A. | Increase |
| B. | Decrease |
| C. | Remain same |
| D. | Be zero |
| Answer» C. Remain same | |
| 159. |
Carriers of electric current in superconductors are |
| A. | Electron |
| B. | Photons |
| C. | Holes |
| D. | Phonons |
| Answer» B. Photons | |
| 160. |
When an AC source is connected across a resistor |
| A. | The current leads the voltage in phase |
| B. | The current legs behind the voltage in phase |
| C. | The current and voltage are in same phase |
| D. | None of the above |
| Answer» D. None of the above | |
| 161. |
Fluorescent tubes are fitted with a choke. The choke coil |
| A. | Steps up the line voltage |
| B. | Steps-down the line voltage |
| C. | Reduces current in the circuit |
| D. | Chokes low frequency current |
| Answer» D. Chokes low frequency current | |
| 162. |
Two wires have their lengths, diameters and resistivities all in the ratio of 1 : 2 : 1. If the resistance of the thinner wire is 10 ohm, the resistance of the thicker wire is |
| A. | 5 ohm |
| B. | 10 ohm |
| C. | 20 ohm |
| D. | 40 ohm |
| Answer» C. 20 ohm | |
| 163. |
The north pole of the earth's magnet is near the geographical |
| A. | South |
| B. | East |
| C. | West |
| D. | North |
| Answer» B. East | |
| 164. |
If the current in the core decreases, the strength of the magnetic field |
| A. | Decreases |
| B. | Increases |
| C. | Remains same |
| D. | None of these |
| Answer» B. Increases | |
| 165. |
The intensity of a magnetic field is defined as the force experienced by a |
| A. | Standard compass |
| B. | Unit positive charge |
| C. | Unit negative charge |
| D. | Unit north pole |
| Answer» E. | |
| 166. |
If two bulbs of 25 W and 100 W rated at 200 V, are connected in series across a 440 V supply |
| A. | 25 W bulb will fuse |
| B. | 100 W bulb will fuse |
| C. | None will fuse |
| D. | Both will fuse |
| Answer» B. 100 W bulb will fuse | |
| 167. |
A magnetic needle is kept in non uniform magnetic field. It experiences |
| A. | A force and a torque |
| B. | A force but not a torque |
| C. | A torque but not a force |
| D. | None of these |
| Answer» B. A force but not a torque | |
| 168. |
A source of magnetic field is |
| A. | A static electric charge |
| B. | A moving electric charge |
| C. | A current loop |
| D. | Both (b) and (c) |
| Answer» E. | |
| 169. |
The temperature at which termoelectic power of a thermo couple becomes zero, is called |
| A. | Inversion temperature |
| B. | Neutral temperature |
| C. | Junction temperature |
| D. | Null temperature |
| Answer» C. Junction temperature | |
| 170. |
A horizontal cable carries a current from west to east. the direction of the magnetic field produced by the current at a point vertically above the wire is |
| A. | South to north |
| B. | North to south |
| C. | East to west |
| D. | West to east |
| Answer» C. East to west | |
| 171. |
Quantity that remains unchanged in a transformer is |
| A. | Voltage |
| B. | Current |
| C. | Frequency |
| D. | None of these |
| Answer» D. None of these | |
| 172. |
A thermoeletric refrigerator works on |
| A. | Joule effect |
| B. | Seebeck effect |
| C. | Peltier effect |
| D. | None of these |
| Answer» D. None of these | |
| 173. |
In the electrolysis the amount of mass deposited or liberated at an electrode is directly proportional to |
| A. | Square of electric charge |
| B. | Amount of charge |
| C. | Square of current |
| D. | None of the above |
| Answer» C. Square of current | |
| 174. |
The temperature at which a ferromagnetic material becomes paramagnetic, is called |
| A. | Critical temperature |
| B. | Inversion temperature |
| C. | Curie temperature |
| D. | Neutral temperature |
| Answer» D. Neutral temperature | |
| 175. |
Which of the following pairs of material serves as electrodes in chargeable batteries commonly used in device such as torch? |
| A. | Iron and cadmium |
| B. | Nickel and cadmium |
| C. | Lead peroxide and lead |
| D. | Zinc and carbon |
| Answer» C. Lead peroxide and lead | |
| 176. |
When an ebonite rod is rubbed with fur, the charge acquired by the fur is |
| A. | Negative |
| B. | Positive |
| C. | Neutral |
| D. | None of these |
| Answer» C. Neutral | |
| 177. |
A metallic cylinder carries a direct current. The magnetic field produce by it exists |
| A. | Outside the cylinder only |
| B. | Inside the cylinder only |
| C. | Both inside and outside the cylinder |
| D. | None of the above |
| Answer» D. None of the above | |
| 178. |
The SI unit of electric flux is |
| A. | Weber |
| B. | Newton per coulomb |
| C. | Voltmeter |
| D. | Jule per coulomb |
| Answer» B. Newton per coulomb | |
| 179. |
In bringing an electron towards another electron, the electrostatic potential energy of the system |
| A. | Remains same |
| B. | Becomes zero |
| C. | Increases |
| D. | Decreases |
| Answer» D. Decreases | |
| 180. |
Capacity of a conductor depends upon |
| A. | Size of conductor |
| B. | Thickness of conductor |
| C. | Material of conductor |
| D. | All of these |
| Answer» B. Thickness of conductor | |
| 181. |
A positively charged body has |
| A. | Excess of electron |
| B. | Deficiency of electron |
| C. | No change in number of electron |
| D. | None of the above |
| Answer» C. No change in number of electron | |
| 182. |
Permanent magnet can be made from |
| A. | Cobalt |
| B. | aluminium |
| C. | Zinc |
| D. | Lead |
| Answer» B. aluminium | |
| 183. |
A conductor carries a certain charge. When it is connected to another uncharged conductor of finite capacity, then the energy of the combined system is |
| A. | More than that of the first conductor |
| B. | Less than that of the first conductor |
| C. | Equal to that of first conductor |
| D. | Uncertain |
| Answer» C. Equal to that of first conductor | |
| 184. |
The conductivity of a super conductor is |
| A. | Infinite |
| B. | Very large |
| C. | Very Small |
| D. | Zero |
| Answer» B. Very large | |
| 185. |
Which of the following is most suitable for the core of an electromagnet ? |
| A. | Air |
| B. | Soft iron |
| C. | Steel |
| D. | None of these |
| Answer» C. Steel | |
| 186. |
The susceptibility of a diamagnetic material is |
| A. | Small and negative |
| B. | Small and positive |
| C. | Large and negative |
| D. | Large and positive |
| Answer» B. Small and positive | |
| 187. |
When a metal is heated, its resistance |
| A. | Decreases |
| B. | Increases |
| C. | May increase or decrease |
| D. | Remains constant |
| Answer» C. May increase or decrease | |
| 188. |
Ohm's law does not apply to which of the following? |
| A. | A.C circuits |
| B. | Conductors |
| C. | Semi conductors |
| D. | None of these |
| Answer» D. None of these | |
| 189. |
Armature current in DC motor will be maximum when the |
| A. | Motor has acquired maximum speed |
| B. | Motor has acquired intermediate speed |
| C. | Motor has just started moving |
| D. | None of the above |
| Answer» D. None of the above | |
| 190. |
At a grid sub stations the voltage is stepped up to reduce loss of |
| A. | Current |
| B. | Electrical energy |
| C. | Power |
| D. | Resistance |
| Answer» D. Resistance | |
| 191. |
The reciprocal of resistance is |
| A. | Conductance |
| B. | Resistivity |
| C. | Conductivity |
| D. | None of these |
| Answer» B. Resistivity | |
| 192. |
The electric field between the two spheres of a charged spherical condenser |
| A. | Is zero |
| B. | Is constant |
| C. | Increase with distance from centre |
| D. | Decrease with distance from centre |
| Answer» E. | |
| 193. |
If a high power heater is connected to electric mains, then the bulbs in the house become dim because there is a |
| A. | Current drop |
| B. | Potential drop |
| C. | No current drop |
| D. | No potential drop |
| Answer» B. Potential drop | |
| 194. |
A strong magnetic field is applied on a stationary electron, then the electron |
| A. | Moves in the direction of the field |
| B. | Moves opposite to the field |
| C. | Starts Spinning |
| D. | Remains stationary |
| Answer» E. | |
| 195. |
Increasing the charge on the plates of a capacitor means |
| A. | Increasing the capacitance |
| B. | Increasing the potential difference between the plates |
| C. | Both (a) and (b) |
| D. | None of the above |
| Answer» C. Both (a) and (b) | |
| 196. |
Kirchhoff's voltage law is based on the law of conservation of |
| A. | Momentum |
| B. | Charge |
| C. | Mass |
| D. | Energy |
| Answer» E. | |
| 197. |
The split ring in motion is called |
| A. | Armature |
| B. | Rotor |
| C. | Commutator |
| D. | Core |
| Answer» D. Core | |
| 198. |
No current flows between two charged bodies when connected |
| A. | If they have same capacity |
| B. | If they have the same quantity of charge |
| C. | If they have same potential |
| D. | None of the above |
| Answer» D. None of the above | |
| 199. |
The conductivity of superconductor is |
| A. | Infinite |
| B. | Very large |
| C. | Very small |
| D. | Zero |
| Answer» B. Very large | |
| 200. |
When magnet is heated, it |
| A. | loses its magnetism |
| B. | Gains magnetism |
| C. | Gains magnetism up to certain temperature |
| D. | None of the above |
| Answer» B. Gains magnetism | |