ECAT Pre General Science Online Test With Answers

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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
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