MDCAT Physics MCQ's Test With Answers

MDCAT Physics MCQ's Test

Sr. # Questions Answers Choice
1 The magnitude of potential barrier for Ge is 0.7 v 0.3 V 7v 3 v
2 A pulsating DC can be converted into constant voltage by using Filter Full wave rectifier Half wave rectifie Bridge rectifier
3 In a full wave rectifier with input frequency 50Hz. The frequency of pulsating D)C) received as an output across the load is 50 Hz 100 Hz 500 Hz zero
4 The power output of a full wave rectifier is: Equal to H.W.R Twice of H.W.R Half of H.W.R Four times of H.W.R
5 In a full wave rectifier: DC current is twice that of half wave rectifier DC pulses are twice per cycle that of half wave rectifier DC voltage is twice that of half wave rectifier All are correct
6 A circuit that converts Pulsating DC into smooth DC contain : Filter Capacitor Inductor LC circuit
7 The efficiency of full wave rectifier is: 25.6% 81.2% 81.6% 71.2%
8 The efficiency of half wave rectifier is: 25.6% 1.2% 40.6% 66.6%
9 For a normal AC cycle, during T/2 to T the diode act as: Open switch full wave rectifier Close switch All are correct
10 A device which convert DC into AC is calleD) Invertor Generator Rectifier Motor
11 A certain noninverting amplifier has R1 of 1 kΩ and R2 of 100 kΩ. The closed-loop voltage gain is ……… 100,000 100 1000 101
12 The resistance of operational amplifier between inverting and non-inverting terminal is of the order of: Few Ohms Mega Ohms Few Kilo Ohms Micro Ohms
13 For the same value of resistors the output of non-inverting amplifier compared to the output of inverting amplifier is, (ignoring phase difference) Greater Equal Smaller Undefined
14 A non-inverting amplifier has infinite input resistance then the voltage gain of noninverting amplifier will be: Zero Infinite One 100
15 A non-conducting semiconductor diode is: Forward biased Poorly biased Reverse biased None of them
16 In full wave rectification, the output DC voltage across the load is obtained for. The positive half cycle of input AC only The negative half cycle of input AC The completes cycle of input AC only All of the above
17 The magnetic field due to the electric current in a conducting wire is: Towards the centre of the conducting wire Circular around the conducting wire In the direction of the electric current In the direction opposite to the electric current
18 The magnetic field of a solenoid is quite similar to that of a: Straight conductor A horse shoe magne Any magnet A bar magnet
19 The magnetic field produced due to the current in a straight wire is proportionalto the : Electric current Conducting material Length of the wire Diameter of the wire
20 If an electron vertically downwards, then the horizontal component of the earth’s magnetic field will deflect it to wards West East North North
21 A tritium and alpha particle enter the magnetic field with same kinetic energy, what will be the ratio of their radii? 3:4 √3: 1 √3: 4 √3:√2
22 An electron and a proton are projected at right angles to a uniform magnetic field with the electron trajectory will be less curved than proton’s trajectory the electron trajectory will be more curved than proton’s trajectory ) both trajectories will be equally curved ) both particles continue to move along a straight lins
23 The direction of force experienced by a moving in a magnetic field will be: Parallel to the field Opposite to the field Parallel to its direction of motion Perpendicular to both the field and the velocity vector
24 Charge to mass ratio (e/m) of a charge particle is also called its: Specific charge Specific Force Gyro-magnetic ratio Magneto-mechanical ratio
25 A positively charged particle is moving perpendicular to a uniform magnetic field. The magnetic force makes the particle to move along: An elliptical path A circular path A parabolic path None of these
26 Which one of the following particles projected perpendicular to a uniform magnetic field with the same velocity will be deflected least? Electron Proton Deuton None of these
27 A magnetic field Always exerts a force on a charged particle Never exerts a force on a charged particle Exerts a force on a charged particle if it is moving across the magnetic lines of force Exerts a force on a charged particle if it is moving along the magnetic lines of force.
28 A straight current carrying conductor experiences maximum forces in a uniform magnetic field when it is placed: Parallel to the field Perpendicular o the field At an angle of 45 to the field None of these
29 A long solenoid has 20 turns/ cm. The current necessary to produce a magnetic field of 20 mellites inside the solenoid is approximately: 1A 2A 4A 8A
30 Magnetic field inside a solenoid is: ) Directly proportional to current Inversely proportional to current Directly proportional to its length Inversely proportional to total no of turns
31 A source of a magnetic field is: An isolated magnetic A static electric charge A moving electric charge None of these
32 A steady current is flowing in a conductor of non-uniform cross-section. Thecharge passing through any cross-section per unit time is Directly proportional to the area of cross-section Inversely proportional to the area of cross-section Proportional to square of the area of cross-section Independent of the area of cross-section
33 A cell of negligible resistance and e.m.f 2 V is connected across a series combination of 2,3 and 5 ohms. The p.d. across the 3 Ω resistor is 0.6 V 1/3 V 2/3 V 4/3 V
34 When resistances are connected in Parallel, the effective resistance will be Product of the reciprocals of the individual resistances Product of the individual resistances Sum of the reciprocals of the individual resistances Sum of the individual resistances
35 Which combination of 7 identical resistors of 3-ohm will give 12/13 ohm: 3 series, 4 parallel 5 series, 2 parallel 2 series, 5 parallel 4 series, 3 parallel
36 Which of the Following bulb will glow Brightest? 100W 200W 300W 400W
37 The emf of a cell of negligible internal resistance is 2V. It is connected to the series combination of 𝟐𝛀, 𝟑𝛀 𝐚𝐧𝐝 𝟓𝛀 resistance. The potential difference across 𝟑𝛀 resistance will be in volt: 0.6 2/3 3 6
38 A 100W, 220V bulb is operated on a 110V line, the power consumed is: 25W 75W 50W 100W
39 Resistance of 60 watt bulbs in 120V line is: 20 ohms 240 ohms 0.15 ohms 180 ohms
40 If a source of emf is traversed from positive to negative the potential change will be: Positive Negative Zero Constant
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