Physics ECAT Pre Engineering MCQ's Test For Full Book With Answers

Physics ECAT Pre Engineering MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 Light year is a unit of: Time Distance Velocity Intensity of light
2 When a conductoris moved across a magnetic field: Emf induced its similar to that of a battery Emf induced gives rise to induced current An emf is induced across its ends All are correct None of these
3 In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called: Both A and C Induced emf Both A and B Motion emf Electrostatic emf
4 In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called: Motion emf Electrostatic emf Induced emf Both A and B Both A and C
5 When a conductor is moved across a magnetic field, the redistribution of charge sets up: Magnetic field Electrostatic field Electromagnetic field All of these None of these
6 When a conductor moved with its length parallel to the lines of magnetic fled: An emf is induced across its ends Emf induced is similar to that of a battery Emf passes through the conductor Both A and B None of these
7 The product of induced current and the resistance of the wire through which the current is passing is called: Electromagnetic induction induced emf Induced current Self induced None of these
8 The unit of induced emf is: Volt Nm/As Joule coul<sup>-1</sup> Both A and C All of these
9 Referring to above figure, a changing current in coil P can be produced: At the instant the switch is closed At the instant the switch is opened With the help of rheostat All of these None of these
10 Referring to above figure, due to change in current in the coil P, the change in magnetic flux: Is associated with coil P Is associated with coil S Causes an induced current is coil S All of these None of these
11 Referring to above figure, current in coil P falls from its maximum value to zero: At the instant the switch is closed At the instant the switch is opened When switch is kept open When switch is kept closed None of these
12 Referring to above figure, current in the coil P grows from zero to its maximum value: At the instant the switch is closed At the instant the switch is opened When switch is kept open All of above Neither of above
13 A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when: The coil is distorted The coil is rotated The coil is neither distorted nor rotated Both A and B None of these
14 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
15 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
16
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
17 Micheal Faraday and joseph Henry belong respectively to: USA and England England and France England and USA USA and France None of these
18 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
19 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
20 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
21 The phenomenon of generation of induced emf is called: Electrostatic induced Magnetic induced Electromagnetic induced Electric induced Both A and C
22

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>
23 An induced current can be produced by: Constant magnetic field Changing magnetic field Varying magnetic field Constant electric field None of these
24 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
25 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
26 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
27 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
28 Which of the following quantities remain constant in step up transformer? Current Voltage Power Heat
29 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
30 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
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