MCQs on Digital Electronics Q: Boolean Algebra is essentially based on Truth Logic Symbol Numbers Answer: (b) Logic Q: The logic behind NOR gate is that it gives HIgh output when both the inputs are low Low output when both the inputs are low HIgh output when both the inputs …
PHYSICS MCQs
MCQs on Transistor Q1: The base of a transistor is …………. doped Moderately Lightly Heavily None of the above Answer: (b) Lightly Q2: How many depletion layers are there in a transistor Four One Two Three Answer: (c) Two Q3: A transistor has Two p-n junctions One p-n junction Three p-n junctions …
MCQs on Tunnel Diode Q1: The tunnel diode is mainly used For very high speed of switching To control the power For rectification For fact chopping Answer: (a) For very high speed of switching Q2: The Tunnel diode is best suited for Amplitude limiters Amplifiers Oscillators Rectifiers Answer: (b) Amplifiers …
MCQs on RLC Circuit Q1: A 6.8 kΩ resistor, a 7 mH coil, and a 0.02 μF capacitor are in parallel across a 17 kHz ac source. The coil’s internal resistance Rw is 30 Ω. The equivalent parallel resistance, Rp (eq) is 1,878 Ω 18,780 Ω 18,750 Ω 626 Ω …
MCQs on Valve Electronics (Diode and Triode) Q1: Number of secondary electrons emitted per number of primary electrons depends on Material of target Frequency of primary electrons Intensity None of the above Answer: (c) Intensity Q2: In a diode, when there is saturation current, the plate resistance is Zero Infinite …
MCQs on Electromotive Force (EMF) Q1. The flux used in the equation for the calculation of induced emf in a transformer is in its RMS value Average value Maximum value Twice that of the maximum value Answer: (c) Maximum value Q2: What should be the value of primary to the secondary …
MCQs on Impedance Q1: What is the value of input impedance of a quarter-wave line 50 ohm and the load impedance of 20 ohms? 50 20 1000 125 Answer: (d) 125 Q2: The value of input impedance for a matched line will be equal to Load impedance Characteristic impedance Output …
MCQs on Oscillator Q1: Which among the following parameters acts as an initiator for the operation of an oscillator in the absence of input signal? Noise figure Noise voltage Noise power Noise temperature Answer: (b) Noise voltage Q2: Multivibrators belongs to which of the following category? Square wave oscillators Sinusoidal …
MCQs on Nuclear fission and Nuclear fusion Q1: The splitting of a nucleus into smaller nuclei is Fusion Fission Half-life gamma -radiation Answer: (b) Fission Q2: Name the moderator used in the nuclear reactor? Plutonium Thorium Graphite Berilium Answer: (c) Graphite Q3: Which isotope of Uranium has the capacity to …
MCQs on Viscosity Q1: Which of the following represents viscosity? Potential energy stored in fluid Resistance to fluid motion Roughness of the surface The pressure difference between the two fluids Answer: (b) Resistance to fluid motion Q2: What is the SI unit of viscosity? Candela Poiseiulle Newton/m No units Answer: …
MCQs on Gravitation What happens to the gravitational potential at the centre of the uniform spherical shell which shrinks gradually? (a) Remains constant (b) Decreases (c) Increases (d) Oscillates Answer: (b) Decreases Choose the factor on which the orbital velocity does not depend when the satellite is orbiting close to …
MCQs on Physical World and Measurement How many numbers of base SI units are there? (a) 5 (b) 10 (c) 7 (d) 9 Answer: (c) 7 What is the percentage error in the measurement of the kinetic energy of a body, if there is a positive error of 50% in …
MCQs on Laws of motion Choose the correct statement (a) A body can be accelerated by frictional force (b) There can be zero friction (c) Kinetic friction is greater than rolling friction (d) Frictional force and area of contact between the two surfaces are proportional Answer: (c) Kinetic friction is …
MCQs on Oscillations and Waves Calculate the amplitude for a SHM using the equation x = 3sin2pt + 4cos3pt (a) 3 (b) 5 (c) 4 (d) 7 Answer: (b) 5 What is the constant of propotionality of an oscillator if the damping force is directly propotional to the velocity (a) …
MCQs on Current Electricity What does the internal resistance of a cell mean? (a) The resistance of the material used in the cell (b) The vessel of the cell (c) The electrodes of the cell (d) The electrolyte used in the cell Answer: (d) The electrolyte used in the cell …
MCQs on Optics Calculate the velocity of the light ray in the medium, if the critical angle for TIR from medium to the vacuum is 30°. (a) 2 x 108 m/s (b) 1.5 x 108 m/s (c) 0.75 x 108 m/s (d) 3 x 108 m/s Answer: (b) 1.5 x …
MCQs on Second Law of Motion A bullet of 5 gms travels with a velocity of 100 m/sec. It penetrates a wooden block up to 6 cm. What is the average force imposed on the block by the bullet? 0 417 N 830 N 830 N Answer: (b) 417 N …
MCQs on Relative Velocity Two bikes travelling in the same direction move at a speed of 30 km/hr. The bikes are separated by a distance of 5 km. What would the speed of the car travelling in the opposite direction be if it meets these bikes at an interval of …
MCQs on Photometry What is the power of the lamp if its luminous efficiency is 2 lumen/watt and its luminous intensity is 42 candela? 62 W 138 W 76 W 264 W Answer: (d) 264 W In a movie hall, if the distance between the screen and the projector is …
MCQs on Semiconductor Device Which among the following is the most commonly used semiconductor? Silicon Carbon Germanium Sulphur Answer: (a) Silicon What happens to the resistance of a pure semiconductor when heated? The resistance increases The resistance decreases The temperature remains the same Can’t say Answer: (b) The resistance decreases …
MCQs on Third law of motion Walking is possible on the account of Newton’s First Law of Motion Newton’s Second Law of Motion Newton’s Third Law of Motion Newton’s Law of Gravitation Answer: (c)Newton’s Third Law of Motion When we jump out of the boat standing in still water, the …