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ECAT Pre General Science Online Test
| Sr. # | Questions | Answers Choice |
|---|---|---|
| 1 | 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:"Times New Roman","serif""><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:"Times New Roman","serif""><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:"Times New Roman","serif""><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:"Times New Roman","serif""><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:"Times New Roman","serif""><o:p></o:p></span></p> |
| 2 | 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 |
| 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 | 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 |
| 5 | 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) |
| 6 | 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 |
| 7 | The phenomenon of generation of induced emf is called | Electrostatic induction Magnetic induction Electromagnetic induction Electric induction Both (A) and (D) |
| 8 | An induced current can be produced by: | Constant magnetic field Changing magnetic field Varying magnetic feild Constant electric field None of these |
| 9 | 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 |
| 10 | 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 |
| 11 | 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) |
| 12 | A long wire wound tightly on a cylindrical core is called: | Potentiometer Solenoid Toroid Wheat and stone bridge None of these |
| 13 | 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 |
| 14 | Magnetic flux passing through a element whose vector area makes an angle0º with lines of magnetic force is: |
BA<span style="font-family: "Times New Roman", 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:"Times New Roman","serif""><o:p></o:p></span></p> Zero BA BA sin<span style="font-size:12.0pt;line-height:107%; font-family:"Times New Roman","serif";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 |
| 15 | At a given instant, a photon moves in +x direction in a region where there magnetic field in -z direction. The magnetic force on the proton will be the: | -y direction +y direction +z direction -z direction None of these |
| 16 | NmA-1 is commonly called: | Weber Apmere Guass Coulomb None of these |
| 17 | Strength of magnetic field is measured in SI units, in: | N N/Am Am/N Nm/A None of these |
| 18 | The permeability of free space is measured in: | Wb/Am Wb A/m Am/Wb m/Web A None of these |
| 19 | If the number of turns of a solenoid (carrying a steady current I) is doubled without changing the length of a solenoid, then magnetic field: | Becomes Half Becomes double Is not affected Becomes one fourth None of these |
| 20 | The magnetic field inside a solenoid can be increased by: | Increasing n Decreasing I Increasing I By using iron core within solenoid All correct except (B) |
| 21 | Total number of turns on 0.15 m length solenoid is 300. the value of n is: | Greater than 300 Smaller than 300 Equal to 300 Any of (A) or (B) Any of (A) or(C) |
| 22 | Hold the solenoid in the right hand with fingers curling in the direction of current. The direction of the field will be given by: | <p class="MsoNormal" style="text-align:justify"><span style="font-size: 12pt; line-height: 107%; font-family: "Times New Roman", serif;">Thumb<b><o:p></o:p></b></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Curled fingers<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Middle finger<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Arm of right hand<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">None of these<o:p></o:p></span></p> |
| 23 | In the formula B= µ̻ nl, the symbol n denotes: | <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Total number of turns of solenoid<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size: 12pt; line-height: 107%; font-family: "Times New Roman", serif;">Number of turns per unit length<b><o:p></o:p></b></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Number of turns per unit volume<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Numbers of turns per unit area<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Number of moles<o:p></o:p></span></p> |
| 24 | A field is uniform and much stronger: | <p class="MsoNormal" style="text-align:justify"><span style="font-size: 12pt; line-height: 107%; font-family: "Times New Roman", serif;">Inside a long solenoid<b><o:p></o:p></b></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Outside a long solenoid<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">At the end of a long solenoid<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">At the central point of long solenoid<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">None of these<o:p></o:p></span></p> |
| 25 | A solenoid is a coil of wire which is: | <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Short, loosely wound, cylindrical<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Long, tightly wound, spherical<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Long, loosely wound, cylindrical<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size: 12pt; line-height: 107%; font-family: "Times New Roman", serif;">Long, tightly wound, cylindrical<b><o:p></o:p></b></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">None of these<o:p></o:p></span></p> |
| 26 | Amperean path is a: |
<p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Closed path<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Rectangular path<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Circular path<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size: 12pt; line-height: 107%; font-family: "Times New Roman", serif;">Any of above<b><o:p></o:p></b></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Broken path<o:p></o:p></span></p> |
| 27 | Magnetic induction is also called as: | <p class="MsoNormal" style="text-align:justify"><span style="font-size: 12pt; line-height: 107%; font-family: "Times New Roman", serif;">Ampere’s law<b><o:p></o:p></b></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Faraday’s law<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Lenz’s law<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Newton’s law<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Coulomb’s law<o:p></o:p></span></p> |
| 28 | if the field is directed along the normal to the area, then flux is: | <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Maximum<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Equal to zero<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Equal to BA<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Minimum<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size: 12pt; line-height: 107%; font-family: "Times New Roman", serif;">Both (A) and (C)<b><o:p></o:p></b></span></p> |
| 29 | the current is pass
through the straight wire. The magnetic field established around it has its
lines of force: |
<p class="MsoNormal" style="text-align:justify"><span style="font-size: 12pt; line-height: 107%; font-family: "Times New Roman", serif;">Circular and endless<b><o:p></o:p></b></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Oval in shape and endless<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Straight<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Parabolic<o:p></o:p></span></p> All are true |
| 30 | Magnetic lines of force: | <p class="MsoNormal" style="text-align:justify"><span style="font-size: 12pt; line-height: 107%; font-family: "Times New Roman", serif;">Cannot intersect at all<b><o:p></o:p></b></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Intersect at infinity<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Intersect within magnet<o:p></o:p></span></p> <p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:"Times New Roman","serif"">Intersect at Neutral Point<o:p></o:p></span></p> <span style="font-family: "Times New Roman", serif; font-size: 16px; text-align: justify;">None of these</span> |
