MCQs on Photoelectric Effect Q1: Photoelectric effect was explained by Einstein Faraday Plank Hertz Answer: (a) Einstein Q2: In a photoelectric experiment for 4000 Å incident radiation, the potential difference to stop the ejection is 2 V. If the incident light is changed to 3000 Å, then the potential required …
MCQs on Optical Microscope Q1: What is the ratio of resolving power of an optical microscope for wavelengths λ1= 4000 Å and λ2= 6000 Å? 2:3 3:2 6:25 16:9 Answer: (b) 3:2 Q2: Two identical glass (μg=3/2) equi – convex lenses of focal length f each are kept in contact. …
MCQs on Fibre Optics Q: Data signal with minimum error is generated by which among the following Signal processing circuits Photodiode Linear circuitry None of the above Answer: (c) Linear circuitry Q: Which among the following is described by the concept of numerical aperture in an optical fibre? Light collection …
MCQs on Elastic and Inelastic Collision Q1: The principle of conservation of linear momentum can be strictly applied during a collision between two particles provided the time of impact is Moderately small Extremely large Extremely small Depends on a particular case Answer: (b) Extremely small Q2: In an elastic collision …
MCQs on Work Done by Constant Force Q1: If the unit of force and length each be increased by four times, then the unit of energy is increased by 16 times 8 times 2 times 4 times Answer: (a) 16 times Q2: A man pushes a wall and fails to …
MCQs on Conservation of Energy and Momentum Q1: Work done in raising a box depends on How fast it is raised The strength of the man The height by which it is raised None of the above Answer: (c) The height by which it is raised Q2: A light and …
MCQs on Non-uniform Circular Motion Q1: A bottle of soap water is grasped by the neck and swings briskly in a vertical circle. Near which portion of the bottle do the bubbles collect Near the bottom In the middle of the bottle Near the neck Uniformly distributed in the bottle …
MCQs on Radioactivity Q1: The neutral atoms of all isotopes of the same element contain the same number of __________. neutrons only. Electrons Mass numbers Masses Answer: (b) Electrons Q2: The atomic number is not changed by which type of radioactive decay? Beta Gamma Alpha The atomic number is affected …
MCQs on Zener Diode Q: In a Zener diode with a high breakdown voltage has Lightly doped P and N P or N is lightly doped Heavily doped P and N None of these Answer: (a) Lightly doped P and N Q: In Zener diode, the Zener breakdown takes place Below 6 …
MCQs on Oscillation Q1: The time period of a simple pendulum is T remaining at rest inside a lift. Find the time period of the pendulum when the lift starts to move up with an acceleration of g/3 T T/2 2T/5 T√3/2 Answer: (d) T√3/2 Q2: The length of the …
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 …
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 …