ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 The SI unit of magnetic flux is. weber Nm<sup>-1</sup>A<sup>-1</sup> tesla gauss
2 The total number of lines of magnetic induction pasing through a surface perpendicular to the magnetic field is called magnetic flux magnetic flux density magnetic induction magnetic field intensity
3 The unit of magnetic flux is Weber-m<sup>2</sup> Weber-m<sup>3</sup> Henry Weber
4 Weber is a unit of magnetic flux magnetic filed intensity magnetic induction magnetic flux density
5 Magnetic flux and flux density are related by Flux density = flux x area Flux density = flux / area Flux density = flux - area None of these
6 The SI unit of magnetic flux is NmA<sup>-2</sup> NmA<sup>-1</sup> NAm<sup>-1</sup> Nm<sup>2</sup>A<sup>-1</sup>
7 If current through conductor is 1 A and length of conductor is 1m placed at right angle to the magnetic field, then the strength of magnetic field is F = B<sup>2</sup> F = 0 F = B F = B/2
8 The force exerted on a conductor of length L, carrying current I when placed in a magnetic field B is given by F=IB/L F= L x B/I F = IL x B F = IL . B
9 The SI unit of magnetic induction is Gauses Tesla Weber Weber<sup>2</sup>
10 A relationship between Gauses of magnetic induction and Tesla(T) is given by G 10<sup>-3</sup>T G = 10<sup>-2</sup>T G = 10<sup>-4</sup>T G = 10<sup>-1</sup>T
11 A meter wire carraying a current of 2A is at right angle to the uniform magnetic field of 0.5 Weber/m2The force on the wire is 5N 4N 1.5N 6N
12 The SI unit of magnetic induction is tesla which is equal to Newton/ampere-meter or N/A-m Newton/ampere<sup>2</sup>-meter or N/A<sup>2</sup>-m Newton/ampere<sup>2</sup>-meter<sup>2</sup> or N/A<sup>2</sup>-m<sup>2</sup> Newton/ampere<sup>2</sup>-meter<sup>2</sup>or N/A<sup>2</sup>-m<sup>2</sup>
13 The force acting as one meter length of the conductor placed at right angle to the magnetic field, when one A current is passing through it, defines the magnetic flux magnetic induction magnetic field self inductance
14 Gauss(G) is smaller unit of magnetic induction which is related to tesla(T) as IT = 10<sup>-4 </sup>G IT = 10<sup>5</sup>G IT = 10<sup>3</sup>G IT = 10<sup>4</sup>G
15 The force acting on a charge moving in a magnetic field is perpendicular to the both magnetic field and direction of motion is proportional to the magnetic of charges vanishes when the motion is directly opposite to the direction of field all of the above
16 'K' is the proportionality constant of force experienced by conductor. What is the value of 'K' in SI units? 0 1 0.5 -1
17 A current carrying conductor is placed at right angle to the magnetic field. The magnetic force experienced by the conductor is minimum maximum zero none of these
18 In a straight current carrying conductor, the direction of magnetic field can be found by right hand rule left hand rule head to tall rule none of these
19 The direction of lines of force depends upon the direction of voltage current charges none of these
20 The most suitable material for permanent magnet is cobalt iron steel alaminium
21 The field around a moving charge is called magnetic field conservative field non-conservative field none of these
22 The sources of magnetic field are isolated magnetic poles charges at rest charges in motion none of these
23 Heating effect caused by an electric circuit is written H = I<sup>2</sup>Rt H = I<sup>2</sup>R H = IR<sup>2</sup>t H = IR<sup>2</sup>
24 Electric generators which convert mechanical energy into solar energy thermal energy kinetic energy electrical energy
25 Solar cell converts sunlight directly into potential energy thermal energy mechanical energy electrical energy
26 If a 40 watt light bulb burns for 2 hours. how much heat is generated 288 x 10<sup>3</sup>J 288 x 10<sup>8</sup>J 288 x 10<sup>5</sup>J 288 x 10<sup>6</sup>J
27 The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of power current resistance temperature
28 The speed of randomly moving electrons depends upon pressure volume temperature mass
29 The conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of negative charges positive charges protons electrons
30 The charge carriers in gases are electrons ions protons ions and electrons
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