MCQs on Bipolar Junction Transistor Q1: For a transistor to operate in an active region what is the essential possible condition of biasing? Collector-base and emitter-base junctions are reverse biased. Collector-base junction is reverse biased and the emitter-base is forward biased Collector-base and emitter-base junctions are forward biased Collector-base junction …
MCQs on Photodiode Q1: Photodiode is used in the detection of Visible light Invisible light No light Both visible and invisible light Answer: (d) Both visible and invisible light Q2: In using a photodiode as a photodetector, it is invariably reverse biased The power consumption is much reduced compared to …
MCQs on PN Junction Diode Q1: In a PN junction with no external voltage, the electric field between acceptor and donor ion is called a Peak Barrier Threshold Path Answer: (b) Barrier Q2: In a PN junction the potential barrier is due to the charges on either side of the …
MCQ on Series and Parallel Circuits Q1: A certain circuit is composed of two parallel resistors. The total resistance is 1,403 Ω. One of the resistors is 2 Ω. The other resistor value is 1,403 Ω 4.7 kΩ 2 kΩ 3,403 Ω Answer: (b) 4.7 kΩ Q2: A voltage divider …
MCQ on Junction Transistor Q1. The emitter-base junction of a transistor is ………. Biased while the collector-base junction is …………. Reverse, Forward Reverse, Reverse Forward, forward Forward, reverse Answer: (d) Forward, reverse Q2: A NPN transistor conducts when Both collector and emitter are positive with respect to the base Collector …
MCQ on Inductance Q1: Mutual inductance between two magnetically coupled coils depends on Permeability of the core material Number of turns of the coils The cross-sectional area of their common core All of the above Answer: (d) All of the above Q2: What will be the inductance if the iron …
MCQ on Ac Generator Q1: An alternator is an electromechanical ac generator. True False Answer: (B) False Q2: In A.C generator increasing the no. of turns in the coil Decreases the Electromotive force (EMF) Electromotive force (EMF) remains the same Increases the Electromotive force (EMF) Electromotive force (EMF) becomes zero …
MCQ on Voltage Regulator Q1: Which of the following is considered as three-pin voltage regulator ICs? Voltage regulators which are adjustable Fixed voltage regulator Both a and b Answer: (c) Both a and b Q2: Which type of IC voltage regulator there is a continuous variation in the impedance of …
MCQ on Mass Defect Q1: If the radius of the 13Al27 nucleus is taken to be RAl then the radius of 53Te125 nucleus is nearly (53/13)1/3RAl 5/3 RAl ⅗ RAl (13/53) ⅓ RAl Answer: (b) 5/3 RAl Q2: A nucleus of uranium decays at rest into nuclei of thorium and …
MCQ on Keplers Law Q1: When a planet orbits the Sun, one of the foci of the elliptical orbit is The axis The perihelion The centre The Sun Answer: (d) The Sun Q2: What has an eccentricity of zero? A straight line A large ellipse A circle A small ellipse …
MCQs on Decomposition Reaction CO2 obtained by the complete decomposition of 20 g CaCO3 at STP is (a) 4.48 l (b) 2.24 l (c) 44.8 l (d) 48.4 l Answer: (a) Decomposition of hydrogen peroxide to give H2O + O2 is an example of (a) reduction (b) oxidation (c) both …
MCQs on Titration Which of the following is used as an indicator in the titration of iodine with hypo? (a) Methyl red (b) Methyl orange (c) Starch (d) Potassium ferricyanide Answer: (c) What will be the pH at the equivalence point in the titration of a weak acid and a …
MCQs on Atmosphere The term biosphere refers to (a) Rocks and minerals (b) Plants and animals (c) Water sources (d) Atmosphere and lithosphere Answer: (b) The boundary between troposphere and stratosphere is known as (a) tropopause (b) ionopause (c) stratopause (d) mesopause Answer: (a) Ozone hole is (a) increase in …
MCQs on Glucose ????-D(+)-Glucose has how many asymmetric carbons? (a) 4 (b) 3 (c) 6 (d) 5 Answer: (a) In the process of glycolysis (a) glucose is converted to haem (b) glucose is oxidised to pyruvate (c) pyruvate is converted to citrate (d) glucose is oxidised to glutamate Answer: (b) …
MCQs on Fuel Cell Which of the following converts energy from the combustion of fuel directly to the electrical energy? (a) Ni-Cd cell (b) Dynamo (c) Fuel cell (d) Electrolytic cell Answer: (c) Which of the following is continuously replaced in a fuel cell? (a) Oxidiser (b) Fuel (c) Both …
MCQs on Chlorine Gas Which among the following is the strongest oxidising agent? (a) F2 (b) I2 (c) Br2 (d) Cl2 Answer: (a) Calcium chlorite has the molecular formula (a) Ca(ClO4)2 (b) Ca(ClO3)2 (c) CaClO2 (d) Ca(ClO2)2 Answer: (d) Four lone pairs of electrons are present in (a) O (b) …
MCQs on Quantum Numbers Which of the following quantum numbers can distinguish between two electrons present in the same orbital? (a) Azimuthal quantum number (b) Principal quantum number (c) Magnetic quantum number (d) Spin quantum number Answer: (d) How many orbitals can have the following quantum numbers, n = 3, …
MCQs on Entropy For spontaneous adsorption of gas (a) ΔS is negative so ΔH should be highly positive (b) ΔS is negative so ΔH should be highly negative (c) ΔS is positive so ΔH should also be highly positive (d) ΔS is positive so ΔH should be negative Answer: (b) …
MCQs on Aromaticity Which of the following compounds is not aromatic? 2. Which of the following is not a characteristic property of arenes? (a) Delocalisation of ????-electrons (b) Resonance (c) Greater stability (d) Electrophilic additions Which of the following statements is true for benzene? (a) Benzene easily undergoes …
MCQs on Benzene and its Derivatives This can be a halide in the Friedel Crafts reaction (a) isopropyl chloride (b) chlorobenzene (c) bromobenzene (d) chloroethene Which of the following will not easily undergo Friedel Crafts reaction? (a) Xylene (b) Nitrobenzene (c) Cumene (d) Toluene When phenyl methyl ether reacts with …
MCQs on VSEPR Theory Which of the following species has 120° bond angles? (a) NCl3 (b) PH3 (c) ClF3 (d) BCl3 Which of the following species has a trigonal planar shape? (a) NO3– (b) CO2 (c) N3 (d) NO2– Which of the following has a linear shape? (a) NO2– (b) …