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Physics ECAT Pre Engineering Chapter 15 Electromagnetic Induction Online Test
| Sr. # | Questions | Answers Choice |
|---|---|---|
| 1 | Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current: | Of same magnitude in the same direction Of different magnitude in the same direction Of same magnitude but in opposite direction Of different magnitude in the opposite direction None of these |
| 2 | When there is no relative motion between the magnet and coil, the galvanometer indicates: | No current in circuit An increasing current A decreasing current Either B or C |
| 3 | The magnitude of induced emf depends upon the: |
Rate of decrease of magnetic field Rate of change of magnetic field Rate of increase of magnetic flux Constancy of magnetic field None of these |
| 4 | Micheal Faraday and joseph Henry belong respectively to: | USA and England England and France England and USA USA and France None of these |
| 5 | In magnet-coil experiment, emf can be produced by: | Keeping the coil stationary and moving the magnet Keeping the magnet stationary and moving the coil Relative motion of the loop and magnet Any one of above All above |
| 6 | The induced current in the loop can be increased by: | Using a strong magnetic field Moving the loop faster Replacing the loop by a coil of many turns All of above None of these |
| 7 | The induced current in a conductor depends upon: | Resistance of the loop Speed with which the conductor moves Any of these Both A and B None of these |
| 8 | The phenomenon of generation of induced emf is called: | Electrostatic induced Magnetic induced Electromagnetic induced Electric induced Both A and C |
| 9 | An
induced current can be produced by: |
<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">Constant magnetic field</span> <span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">Changing magnetic field</span> <span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">Varying magnetic field</span> <span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">Constant electric field</span> <span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">None of these</span> |
| 10 | An induced current can be produced by: | Constant magnetic field Changing magnetic field Varying magnetic field Constant electric field None of these |
| 11 | An emf is set up in a conductor when it: | Is kept in a magnetic field Is kept in an electric field Moves across a magnetic field Both A and B None of these |
| 12 | The current produced by moving a loop of wire across a magnetic field is called: | Direct current Magnetic current Alternating current Induced current None of these |
| 13 | Eddy current is produced when: | A metal is kept in varying magnetic field A metal is kept in steady magnetic field A circular coil is placed in a steady magnetic field A current is passed through a circular coil |
| 14 | Step up transformer has a transformation ratio of 3:2. What is the voltage in secondary, if voltage in primary is 30V: | 45 V 15 V 90 V 300 V |
| 15 | Which of the following quantities remain constant in step up transformer? | Current Voltage Power Heat |
