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 The entire wave form of sinusoidal voltage is actually a set of all the: Positive maximum value + V<sub>o</sub>and negative maximum value -V<sub>o</sub> Posiotive maximum value +V<sub>o </sub>and zero Zero and negative maximum value -V<sub>o</sub> Any of these None of these
2 The waveform of alternating voltage is a: Square Rectangular Saw-tooth Sinusoidal None of these
3 The wave form of alternating voltage is the graph between: Voltage across X-axis and time across y-axis Current and time Voltage along y-axis and time along x-axis Voltage and current Either (B) or (D)
4 The most common source of alternating voltage is: Motor Transformer AC genrator Both (A) and (C) Both (A) and (B)
5 The time interval during which the Voltage source changes its polarity once is known as: Time period T Half the time period Quarter the time period Two third of the time period None of these
6 Nowadays, Most of the electric energy is produced by the A.C. generators using: Hydal water Geothermal energy Solar energy Biomass Both (B) and (D)
7 Alternating current is produced by a voltage source which polarity: Remains the same Reverse after period T Keeps on reversing with time Reverse after every time interval T/2 Both (C) and (D)
8 Alternating current can be transmitted: To long distance At very high cost At very low cost Both (A) and (C) Both (A) and (B)
9 The direction of induced current is always so as to oppose the cause which produces it. This is Lenz's law Ampere's law Faraday's law Coulomb's law None of these
10 Faraday's law of electromagnetic induction has been used in the construction of: Galvanometer Voltmeter Electric motor Electric genrator Commutator
11 The law of electromagnetic induction is related to: Coulomb Ampere Faraday Lenz None of these
12 The rate change of area expressed is expressed in: None of these ms<sup>-1</sup> m<sup>2</sup>s<sup>-2</sup> ms<sup>-2</sup> m<sup>2</sup>s<sup>-1</sup>
13 Plan of a coil makes an angle of 20º with the lines of magnetic field. The angle between B and vector area of plane of coil is:

 Also 20<span style="font-family: &quot;Times New Roman&quot;, serif; font-size: 12pt; text-align: justify;">º</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></p> 70<span style="font-family: &quot;Times New Roman&quot;, serif; font-size: 12pt; text-align: justify;">º</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></p> 90<span style="font-family: &quot;Times New Roman&quot;, serif; font-size: 12pt; text-align: justify;">º</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></p> 180<span style="font-family: &quot;Times New Roman&quot;, serif; font-size: 12pt; text-align: justify;">º</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></p> None of these
14 A square loop of wire is moving through a uniform magnetic field. The normal to the loop is oriented parallel to the magnetic field. The emf induced in the loop is: Zero Of smaller magnitude Of larger magnitude Sometimes B, sometimes C Neither of these
15 A metal road of length 1m is moving at a speed of 1 ms-1In a direction making angle of 30º with 0.5 Y magnetic field. The emf produced in the rod is:

 0.25 N 0.25 V 2.5 V 2.5 N 25 V
16 Motional emf is called motional: Electromagnetic force and is measured in newtons Electromotive force and is measured in volt Electromotive force and is measured in newtons Electromagnetic force and is measured in volts None of these
17 When the conductor moved across a magnetic field: Emf induced is similar to that of a battery<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></p> Emf induced gives rise to induced current<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></p> An emf induced across its ends<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></p> All are correct<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></p> None of these<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></p>
18 A coil of constant area is placed in a constant magnetic field. An include current is produced in the coil when: The coil is destroyed The coil is Rotated The coil is neither destroyed nor rotated Both (A) and (B) None of these
19 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
20 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
21 The induced current in the loop can be increased by: Using a stronger magnetic field Moving the loop faster Replacing the loop by a coil of many turns All above Both (A) and (B)
22 The induced current is a conductor depends upon: Resistance of the loop Speed with which the conductor moves Any of these Both (A) and (B) None of these
23 The phenomenon of generation of induced emf is called Electrostatic induction Magnetic induction Electromagnetic induction Electric induction Both (A) and (D)
24 An induced current can be produced by: Constant magnetic field Changing magnetic field Varying magnetic feild Constant electric field None of these
25 An emf is set up in a conductor when it: is kept in a magnetic field is kept in a electric field Move across a magnetic field Both (A) and (B) None of these
26 The current produced by moving a loop of a wire across a magnetic field is called: Direct current Magnetic current Alternating current Induced current None of these
27 When the charged particle is projected at right angles to the field, then experienced by it will be: Maximum Zero qvB Both (A) and (B) Both (A) and (C)
28 A long wire wound tightly on a cylindrical core is called: Potentiometer Solenoid Toroid Wheat and stone bridge None of these
29 Magnetic flux passing through the an element of are A placed perpendicular to a uniform magnetic field Bis: Maximum Minimum Zero Very small None of these
30 Magnetic flux passing through a element whose vector area makes an angle0º with lines of magnetic force is:

 BA<span style="font-family: &quot;Times New Roman&quot;, serif; font-size: 12pt; text-align: justify;">CosѲ</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></p> Zero BA BA sin<span style="font-size:12.0pt;line-height:107%; font-family:&quot;Times New Roman&quot;,&quot;serif&quot;;mso-fareast-font-family:Calibri; mso-fareast-theme-font:minor-latin;mso-ansi-language:EN-US;mso-fareast-language: EN-US;mso-bidi-language:AR-SA">Ѳ</span> None of these
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