MCAT — Quiz

MCAT Physics Mcq Questions Electronics

50 questions · Test your knowledge

1 A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is
2 The emf induced in a coil by a changing magnetic flux may have unit as
3 A coil of wire is arranged with its plan perpendicular to a uniform magnetic field o flux density B. when the radius of the coil increases from r1 to r2 in time ?t then what is the emf induced in the coil?
4 The emf induced in a conductor of unit length moving with unit velocity at right angles to a magnetic field is equal to
5 The self-inductance of a solenoid is increased when a soft iron core is inserted into it. This is because the soft iron core
6 A small coil lies inside a large coil. The two coils are horizontal concentric and carry currents in opposite directions. The large coil will experience
7 An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 4x10-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum speed of the aeroplane is
8 A.C can not be used for
9 Non inductive resistances are used in decreasing
10 Magnetic compass needle will be deflecting if it is kept near
11 The alternating current has frequency of 106 Hz in such a way that time period for completion of cycle is
12 Long distance transmission is easy for
13 Which one of the following devices does not function like an electric motor?
14 The out put voltage of a transformer is 3 times the input voltage then turns ratio will be
15 For long distance transmission the transformer used is
16 Self inductance of a long solenoid is
17 An electric current induced within the body of a conductor when that conductor either moves through a non uniform magnetic field or in a region where there is a change in magnetic flux is called
18 Lagging of changes in the magnetization of a substance behind changes in the magnetic field as the magnetic field is varied is known as magnetic
19 Transformer works on the principle of
20 When the motor is at its maximum speed then back emf will be
21 Electrons present in p-type material due to thermal pair generation are
22 Semi-conductors with donor atoms and free electrons belong to the type
23 Semi-conductor germanium and silicon are
24 Acceptor and donor impurities donate
25 p-n junction when reversed biased acts as a
26 In p-n-p transistor the collector current is
27 In n-p-n transistor, p works as
28 The simplest type of rectification known as half wave rectification is obtained by
29 Identify the correct statement about minority carriers
30 Depletion region of a junction is formed
31 The velocity of an oscillating charge as it moves to and fro along a wire is always
32 Which one of following band is completely filled in case of conductors?
33 Which one of the following has the greatest energy gap?
34 The value of resistivity for insulator is of the order of
35 Thermions are
36 Hole is equivalent to
37 Which one of the following is not a donor impurity?
38 Forward current through a semi conductor diode circuit is due to
39 In the transistor schematic symbol, the arrow
40 In full wave rectification the output D.C. voltage across the load is obtained for
41 The semiconductor diode can be used as a rectifier because _
42 In half-wave rectification the output D.C. voltages is obtained across the load for
43 The device or circuit used for conversion of A.C. into D.C. is called
44 The device used for conversion of D.C. to A.C. is called
45 The especially designed semiconductor diodes used as indicator lamps in electronic circuits are
46 The specially designed semi-conductor diodes used as fast counters in electronic circuits are
47 The alternating voltage is an example of
48 The rectangular voltage is an example of
49 The operational amplifier is
50 In a half-wave rectifier the r.m.s. value of the A.C. component of the wave is
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