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ECAT Pre General Science Online Test
| Sr. # | Questions | Answers Choice |
|---|---|---|
| 1 | Micheal Faraday and joseph Henry belong respectively to: | USA and England England and France England and USA USA and France None of these |
| 2 | 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 |
| 3 | 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 |
| 4 | 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 |
| 5 | The phenomenon of generation of induced emf is called: | Electrostatic induced Magnetic induced Electromagnetic induced Electric induced Both A and C |
| 6 | 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> |
| 7 | An induced current can be produced by: | Constant magnetic field Changing magnetic field Varying magnetic field Constant electric field None of these |
| 8 | 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 |
| 9 | 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 |
| 10 | 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 |
| 11 | 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 |
| 12 | Which of the following quantities remain constant in step up transformer? | Current Voltage Power Heat |
| 13 | In a coil current change from 2 to 4 A in .05 s. If the average induced emf is 8V then coefficient of self-inductance is: | 0.2 henry 0.1 henry 0.8 henry 0.04 henry |
| 14 | The induced emf in a coil is proportional to: | Magnetic flux through a coil Rate of change of magnetic flux through the coil Area of the coil Product of magnetic flux and area of the coil |
| 15 | What is the coefficient of mutual inductance, when the magnetic flux changes by 2 X 10-2Wb, and change in current is 0.01 A? | 2 H 3 H 1/2 H Zero |
| 16 | The device in which induced emf is statically induced emf is: | Transformer AC generator Alternator Dynamo |
| 17 | For inducting emf in a coil the basic requirement is that: | Flux should link the coil Change in flux should link the coil Coil should form a closed loop Both B and C are true |
| 18 | A spring of constant k = 0.4 N m-1is to be extended through 10 cm at a place where g = 10 m sec-2. The mass to be suspended should be: | 4 gms 0.4 gm 40 gms None of these |
| 19 | A body with frequency would complete one vibration in: | f seconds 1/f seconds 1 second f<sup>2</sup>second |
| 20 | If a given spring of spring constant k is cut into two indentical segments, the spring constant of each segment is: | k/2 2 k 4 k None of these |
| 21 | In SHM, there is always a constant ratio between displacement if body and its: | Velocity Period Mass Acceleration |
| 22 | The number of vibrations in two seconds can be expressed as______if frequency of vibration is f. | f 2 f 3 f 1/2 f |
| 23 | If a force of 0.05 N produces an elongation of 20 mm in string, then its spring constant will be: | 250 N m<sup>-1</sup> 25 N m<sup>-1</sup> 2.5 N m<sup>-1</sup> None of these |
| 24 | If a mass of 10 gm is suspended from a spring of k = 9.8 Nm-1, then the extension will be: | 1 cm 1 m 10 mm None of these |
| 25 | A particle is moving along a circular path with uniform speed. Its projection will execute____along the____of the circle: | Circular motion, circumference Vibrator, chord SHM, diameter SHM, circumference |
| 26 | The time taken to complete one vibration is called: | Frequency Amplitude Time Time period |
| 27 | When quarter of a cycle is completed, the phase of vibration is: | 90<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;">°</span> 180<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;">°</span> 45<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;">°</span> 360<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;">°</span> |
| 28 | The body oscillates due to ______ accelerates and overshoots the rest position due to _____: | Applied force , inertia Restoring force, friction Frictional force, inertia Restoring force, inertia |
| 29 | Amplitude in SHM is equivalent to_____ in circular motion: | Diameter Radius Circumference None of these |
| 30 | The graph showing the variation of displacement with time is a: | Sine curve Straight line Parabola None of these |
