McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
Chapters
| 151. |
Mean drift velocity of electron in a copper wire having cross-sectional area 5.0 × 10 -6 m2 carrying current of 1 A and having number density 8.5 × 10 28 m3 is {{}} |
| A. | 0.015 mm s-1 |
| B. | 0.1 mm s-1 |
| C. | 0.5 mm s-1 |
| D. | 0.25 mm s-1 |
| Answer» A. 0.015 mm s-1 | |
| 152. |
Magnitude of charge is known as |
| A. | charge count |
| B. | elementary charge |
| C. | elementary count |
| D. | charge number |
| Answer» B. elementary charge | |
| 153. |
1 Ω is equal to |
| A. | 1 V A-2 |
| B. | 1 V A-1 |
| C. | 1 V-1 A |
| D. | 2 V A-1 |
| Answer» B. 1 V A-1 | |
| 154. |
To protect wiring from excessive passing of current is |
| A. | voltmeter |
| B. | fuse |
| C. | galvanometer |
| D. | resistance |
| Answer» B. fuse | |
| 155. |
Current in a 60 W light bulb when it is connected to a 230 V power supply is |
| A. | 0.26 A |
| B. | 1.5 A |
| C. | 2.6 A |
| D. | 3.9 A |
| Answer» A. 0.26 A | |
| 156. |
Grid cables are 15 km long with a resistance of 0.20 Ω km-1, powers wasted as heat in these cables are |
| A. | 50 kW |
| B. | 60 kW |
| C. | 20 kW |
| D. | 30 kW |
| Answer» D. 30 kW | |
| 157. |
Actual velocity of electrons between collisions is |
| A. | 1030 m s-1 |
| B. | 1020 m s-1 |
| C. | 102 m s-1 |
| D. | 105 m s-1 |
| Answer» D. 105 m s-1 | |
| 158. |
By increasing the current, the drift velocity |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | becomes zero |
| Answer» B. increases | |
| 159. |
Current in a circuit depends on |
| A. | resistance |
| B. | potential difference |
| C. | both A and B |
| D. | e.m.f |
| Answer» C. both A and B | |
| 160. |
If direction of current is from positive to negative, then it is called |
| A. | electronic current |
| B. | conventional current only |
| C. | positronic current |
| D. | protonic current |
| Answer» B. conventional current only | |
| 161. |
A voltmeter arranged across the power supply measures |
| A. | potential difference |
| B. | e.m.f |
| C. | current |
| D. | resistance |
| Answer» B. e.m.f | |
| 162. |
Particles involved in the movement within material are |
| A. | protons |
| B. | electrons |
| C. | neutrons |
| D. | positrons |
| Answer» B. electrons | |
| 163. |
Phenomena in which a charged body attract uncharged body is called |
| A. | electrostatic induction |
| B. | electric current |
| C. | charge movement |
| D. | magnetic induction |
| Answer» A. electrostatic induction | |
| 164. |
An uncharged object has |
| A. | more protons |
| B. | more electrons |
| C. | equal electrons and protons |
| D. | no protons and electrons |
| Answer» C. equal electrons and protons | |
| 165. |
Fields that act on objects with masses are |
| A. | electric fields |
| B. | magnetic fields |
| C. | force fields |
| D. | gravitational fields |
| Answer» D. gravitational fields | |
| 166. |
Where an electric charge experiences a force, there is an |
| A. | electric field |
| B. | magnetic field |
| C. | electric current |
| D. | conventional current |
| Answer» A. electric field | |
| 167. |
A field that spreads outwards in all directions is |
| A. | radial |
| B. | non radial |
| C. | strong |
| D. | weak |
| Answer» A. radial | |
| 168. |
At all the points the uniform fields have |
| A. | different strength |
| B. | same strength |
| C. | zero strength |
| D. | infinite strength |
| Answer» B. same strength | |
| 169. |
Electric field strength on a dust particle having charge equal to 8 × 10 - 19 when plates are separated by distance of 2 cm and have a potential difference of 5 kV is {{}} |
| A. | 2.0 × 10 -13 N |
| B. | 3 N |
| C. | 5 N |
| D. | 20 N |
| Answer» A. 2.0 × 10 -13 N | |
| 170. |
Electric field strength can be defined as |
| A. | E =Q⁄F |
| B. | E = W⁄F |
| C. | E =F⁄Q |
| D. | E =P⁄Q |
| Answer» C. E =F⁄Q | |
| 171. |
When one material is rubbed against the other, then it becomes electrically |
| A. | neutral |
| B. | charged |
| C. | positively charged |
| D. | negatively charged |
| Answer» B. charged | |
| 172. |
When an electron is moving horizontally between oppositely charged plates, it will move in the |
| A. | straight line |
| B. | fall directly downwards |
| C. | move towards positive plates |
| D. | curved path |
| Answer» D. curved path | |
| 173. |
E.M.F can be induced in a circuit by |
| A. | changing magnetic flux density |
| B. | changing area of circuit |
| C. | changing the angle |
| D. | all of above |
| Answer» D. all of above | |
| 174. |
A straight wire of length 0.20 m moves at a steady speed of {{}} 3.0 m s-1 at right angles to the magnetic field of flux density 0.10 T. The e.m.f induced across ends of wire is |
| A. | 0.5 V |
| B. | 0.06 V |
| C. | 0.05 V |
| D. | 0.04 V |
| Answer» B. 0.06 V | |
| 175. |
By accelerating the magnet inside the coil, the current in it |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | reverses |
| Answer» A. increases | |
| 176. |
Consequence of motor effect is |
| A. | electromagnetic induction |
| B. | current |
| C. | voltage |
| D. | e.m.f |
| Answer» A. electromagnetic induction | |
| 177. |
Total number of magnetic field lines passing through an area is called |
| A. | magnetic flux density |
| B. | magnetic flux |
| C. | e.m.f |
| D. | voltage |
| Answer» B. magnetic flux | |
| 178. |
Magnitude of induced e.m.f is proportional to |
| A. | rate of change of current |
| B. | rate of change of voltage |
| C. | rate of change of magnetic flux linkage |
| D. | rate of change of resistance |
| Answer» C. rate of change of magnetic flux linkage | |
| 179. |
In transformer, the core is made up of soft iron in order to pass the maximum |
| A. | flux |
| B. | current |
| C. | magnetic flux |
| D. | voltage |
| Answer» C. magnetic flux | |
| 180. |
For a straight wire, induced current depends upon |
| A. | the speed of movement of wire |
| B. | the length of wire |
| C. | the magnitude of magnetic flux density |
| D. | all of above |
| Answer» D. all of above | |
| 181. |
In generators, the rate of change of flux linkage is maximum when the coil is moving through the |
| A. | vertical position |
| B. | horizontal position |
| C. | diagonal position |
| D. | at an angle of 45° |
| Answer» B. horizontal position | |
| 182. |
E.M.F for a coil depends upon |
| A. | the cross sectional area |
| B. | no. of turns of wire |
| C. | the magnitude of magnetic flux density |
| D. | all of above |
| Answer» D. all of above | |
| 183. |
Currents that flow in circles inside a disc are known as |
| A. | eddy currents |
| B. | circular currents |
| C. | air currents |
| D. | alternating curents |
| Answer» A. eddy currents | |
| 184. |
When field is parallel to plane of area, magnetic flux through coil is |
| A. | zero |
| B. | infinite |
| C. | 2 |
| D. | 5 |
| Answer» A. zero | |
| 185. |
Moving a coil in and out of magnetic field induces |
| A. | force |
| B. | potential difference |
| C. | e.m.f |
| D. | voltage |
| Answer» C. e.m.f | |
| 186. |
Induced current in coil by a magnet turns it into an |
| A. | straight wire |
| B. | magnet |
| C. | ammeter |
| D. | electromagnet |
| Answer» D. electromagnet | |
| 187. |
Strength of magnetic field is known as |
| A. | flux |
| B. | density |
| C. | magnetic strength |
| D. | magnetic flux density |
| Answer» D. magnetic flux density | |
| 188. |
Unit of luminous intensity is |
| A. | m |
| B. | kg |
| C. | cd |
| D. | mol |
| Answer» C. cd | |
| 189. |
For a hydrogen atom the electrical force as compared to gravitational force is{{}} |
| A. | 1039 times |
| B. | 10 40 times |
| C. | 10 41 times |
| D. | 10 42 times |
| Answer» A. 1039 times | |
| 190. |
Weakest force in nature is |
| A. | electric force |
| B. | gravitational force |
| C. | weak force |
| D. | magnetic force |
| Answer» B. gravitational force | |
| 191. |
Magnetic field can be produced by using |
| A. | permanent magnet |
| B. | electric current |
| C. | temporary magnet |
| D. | both A and B |
| Answer» D. both A and B | |
| 192. |
Whenever there is force on magnetic pole, there exists |
| A. | magnetic field |
| B. | electric field |
| C. | current |
| D. | voltage |
| Answer» A. magnetic field | |
| 193. |
If the magnetic flux density and current are at right angles, then component of force acting on the conductor is |
| A. | BIL cosθ |
| B. | BIL sinθ |
| C. | BIL tanθ |
| D. | BL sinθ |
| Answer» B. BIL sinθ | |
| 194. |
Unraveling an electromagnetic gives |
| A. | stronger field |
| B. | weaker field |
| C. | moderate field |
| D. | wider field |
| Answer» B. weaker field | |
| 195. |
Force per meter on two wires carrying a current of 1 A placed 1 m apart is equal to {{}} |
| A. | 6.7 × 10 -11 N |
| B. | 9.0 × 10 9 N |
| C. | 2.0 × 10 -7 N |
| D. | 3.0 × 10 -4 N |
| Answer» C. 2.0 × 10 -7 N | |
| 196. |
F = BIL can only be used if the magnetic field and electric current are |
| A. | at right angles to each other |
| B. | in same direction |
| C. | anti-parallel to each other |
| D. | anti-perpendicular to each other |
| Answer» A. at right angles to each other | |
| 197. |
Derived unit Tesla is related to |
| A. | A |
| B. | kg |
| C. | s |
| D. | all of above |
| Answer» D. all of above | |
| 198. |
If we reverse the direction of electric current, then the direction of magnetic field will be |
| A. | reversed |
| B. | remains same |
| C. | becomes tangent |
| D. | becomes normal |
| Answer» A. reversed | |
| 199. |
1 Tesla is equal to {{}} |
| A. | 50 N A-1 m-1 |
| B. | 100 N A-1 m-1 |
| C. | 1 N A-1 m-1 |
| D. | 1000 N A-1 m-1 |
| Answer» C. 1 N A-1 m-1 | |
| 200. |
Field which does not have magnetic poles is |
| A. | straight lined |
| B. | normal to the wire |
| C. | tangent to the wire |
| D. | circular |
| Answer» D. circular | |
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