Top 100 Important Everyday Science Mcqs Set-3 21- Hardware is related to: A. CalculatorB. ComputersC. AcidsD. Heavy metals View Answer Answer : B. Computers Description 22- Which of the following is used in a diesel engine? 1. Cylinder 2. Spark plug 3. Piston A. 1, 2 and 3 B. 1 and 2 C. 2 and 3D. 1 and 3 View Answer Answer : D. 1 and 3 Description 23- Which of the following is the combination of the three primary colours used in a colour TV? A. Yellow, Blue, RedB. Green, Yellow, Blue C. Red, Green, Yellow D. Green, Blue, Red View Answer Answer : D. Green, Blue, Red Description 24- AC cannot be used in: A. AmplifierB. TransformerC. PendulumD. Galvanometer View Answer Answer : C. Pendulum Description 25- Which of the following best explains the phenomenon Simple Harmonic Motion? A. CylinderB. DiscC. PendulumD. None of these View Answer Answer : C. Pendulum Description 26- A thermostat is: A. A device which varies the temperature of a bath B. An instrument by which the accuracy of thermometers are determined C. A device used to maintain constant temperature of a water bath or an ovenD. A modern type of the thermo flask which works on the principle of equipartition of heat energy View Answer Answer : C. A device used to maintain constant temperature of a water bath or an oven Description 27- Jet engines are: A. Rotary engines B. Turbine engines C. External combustion engines D. Reaction engines View Answer Answer : D. Reaction engines Description 28- Rocket works on the principle of: A. Conservation of energy B. Conservation of mass C. Conservation of momentumD. None of these View Answer Answer : C. Conservation of momentum Description 29- The spring balance works on the principle of: A. Boyle’s lawB. Hooke’s lawC. Bernoulli’s principle D. Pascal’s law View Answer Answer : B. Hooke's law Description 30- A biogas plant works to its maximum capacity when: A. Conditions are aerobic and temperature 40°C B. Conditions are aerobic and sewage is supplied C. Conditions are anaerobic and sewage is suppliedD. Conditions are anaerobic and temperature 40°C View Answer Answer : D. Conditions are anaerobic and temperature 40°C Description 31- In an engine run on diesel, ignition is caused through: A. FrictionB. Automatic starter C. Spark plugD. Compression View Answer Answer : D. Compression Description 32- In an electronic watch, the component corresponding to the pendulum of a pendulum clock is: A. DiodeB. TransistorC. Balance Wheel D. Crystal Oscillator View Answer Answer : D. Crystal Oscillator Description 33- The silvered surface of thermos flask prevents transfer of heat by: A. ConductionB. ConvectionC. RadiationD. All of these View Answer Answer : C. Radiation Description 34- Which of the following items is not provided in a first aid box? A. A pair of scissors B. Rectified spiritC. Boric acidD. Pain killing tablets like Anacin View Answer Answer : D. Pain killing tablets like Anacin Description 35- In TV transmission: A. Sound and video signals are transmitted simultaneouslyB. Sound is transmitted first and then the video signal followsC. Video signal is transmitted first, followed by sound signal D. Sound and video signals are transmitted from different places at the same time View Answer Answer : A. Sound and video signals are transmitted simultaneously Description 36- If a bimetallic strip is heated, it will: A. Not bend at all B. Bend towards the metal with lower thermal expansion coefficientC. Bend towards the metal with higher thermal expansion coefficient D. Twist itself into a helix View Answer Answer : B. Bend towards the metal with lower thermal expansion coefficient Description 37- Theodolite is an instrument used by: A. PilotsB. NavigatorsC. CartographersD. Surveyors View Answer Answer : D. Surveyors Description 38- Which of the following is correct? A. Dynamo converts electrical energy into heat energy and electric motor converts mechanical energy into electrical energy B. Dynamo converts mechanical energy into electrical energy and electric motor converts electrical energy into mechanical energyC. Both dynamo and electric motor convert electrical energy into mechanical energyD. Both dynamo and electric motor convert mechanical energy into electrical energy View Answer Answer : B. Dynamo converts mechanical energy into electrical energy and electric motor converts electrical energy into mechanical energy Description 39- An electron microscope gives higher magnification than an optical microscope because: A. It uses more powerful lenses B. The velocity of electrons is smaller than that of visible light C. The electrons have more energy than the light particles D. The wavelength of electrons is smaller as compared to the wavelength of visible light View Answer Answer : D. The wavelength of electrons is smaller as compared to the wavelength of visible light Description 40- The conversion of electrical energy into chemical energy is observed in: A. FanB. Storage batteryC. HeaterD. Incandescent bulb View Answer Answer : B. Storage battery Description 1 2 3 4 5
