--- type: Quiz title: "Sound Quiz: 38 MCQs for OSSC, CGL, RRB & Govt Exams" canonical: "https://www.easy2crack.com/mcqs/physics/sound-quiz-T5Oyu0oo" subject: physics questions: 38 free: true updated: null tags: ["mcq", "practice", "physics"] --- # Sound Quiz: 38 MCQs for OSSC, CGL, RRB & Govt Exams 38 multiple-choice questions with answers. ## Q1. Which of the following atmospheric layers is responsible for the deflection of radio waves? A. Troposphere B. Stratosphere C. Mesosphere D. Ionosphere **Answer:** d ## Q2. The value of 1 kilowatt hour is A. 3.6 X 10 6 J B. 3.6 X 10 3 J C. 10 3 J D. 10 5 J **Answer:** a ## Q3. Which waves cannot be transmitted through vacuum? A. Light B. Heat C. Sound D. Electromagnetic **Answer:** c ## Q4. A dynamo which is said to generate electricity actually acts as a A. Source of ions B. source of electric charge C. Converter of energy D. Source of electrons **Answer:** c ## Q5. Long radio waves are reflected by which of the following layer of Eart's surface? A. Troposphere B. lonosphere C. Tropopause D. Stratosphere **Answer:** b ## Q6. Dynamo is a machine which is used for A. Conversin of high voltage to low voltage B. Conversion of electrial energy to mechanical energy C. Conversion of mechanical energy to electrical energy D. Conversin of low voltage to high voltage **Answer:** c ## Q7. Wireless communication is reflected back to the Earth's surface by the A. troposphere B. Stratosphere C. Ionosphere D. Exosphere **Answer:** c ## Q8. Turbines and Dyanamous are used to convert which energy to electrial energy A. Chemical energy B. Solar energy C. Mechanical energy D. Magnetic energy **Answer:** c ## Q9. What is the distance between two succesive crestsw or successive troughs called? A. Amplitude B. Wavelength C. Frequency D. None of the above **Answer:** b ## Q10. A device which converts electical energy into mechanical energy is A. Dynamo B. Transformer C. Electric motor D. Inductor **Answer:** c ## Q11. Which of the following is a mechanical wave? A. Radio waves B. X-rays C. Light waves D. Sound waves **Answer:** d ## Q12. A device which convers chemical energy into electrical energy is called A. Battery B. Motor C. Generator D. Moving coil meter **Answer:** a ## Q13. A rader which detects the presence of an enemy aircraft uses A. Light waves B. Raiod waves C. Sound waves D. Ultrasound waves **Answer:** b ## Q14. Electric motors operating at low voltages tend to burn out because A. They draw more current which is inversely proportilonal B. They draw more current which is inversely proportional to the square root of the voltage C. They draw heat proportional to y2 D. Low voltage sets in electrical discharge **Answer:** a ## Q15. Which one of the following types of waves are used in a Night Vision appartaus? A. Radio waves B. Micro waves C. Infra-red waves D. None of the above **Answer:** c ## Q16. Which of the ofllowing metals is used as filament in lighting bulbs? A. Iron B. Molybdnum C. Silver D. Tungsten **Answer:** d ## Q17. Waves used for telecommunication are A. Visible light B. Infrared C. Ultraviole D. Micorwave **Answer:** d ## Q18. In a three-pin electrical plug longest pin should be connected to A. Ground terminal B. Live terminal C. Netural terminal D. any terminal **Answer:** a ## Q19. Following rays are used in the diagnosis of intestinal diseases A. X-rays B. a-rays C. B-rays D. Y-rays **Answer:** a ## Q20. CT scan is done by using A. Inra-red Rays B. Ultrasonic Waves C. Visible Light D. X-rays **Answer:** d ## Q21. The electric current does not flow between two peoperly connected charged bodies if they are having A. Same charge B. Same capacity C. Same resistivity D. Same Potential **Answer:** d ## Q22. Which element is the best conductor of electricity? A. Silver B. Copper C. Aluminium D. Iron **Answer:** a ## Q23. A fuse is used in main electric supply as a safety device. Which one of the following statements about the fuse is correct? A. It is connected in parallel with the main switch B. It is made mainly from silver alloys C. It must have a low melting point D. It must have a very high resistance **Answer:** c ## Q24. Principle of fuse is A. Chemical effect of electricity B. Mechanical effect of electricity C. Heating effect of electricity D. Magnetic effect of electricity **Answer:** c ## Q25. A fuse wire is characterized by A. Low resistance and high melting point B. Low resistance and low melting point C. High resistance and low melting point D. High resistance and high melting point **Answer:** c ## Q26. The filament of halogen lamp is an alloy of A. Tungsten and iodine B. Tungsten and bromine C. tungsten and sodium D. Molybdenum and sodium **Answer:** c ## Q27. A write with black insulation during electric supply si A. Live wire B. Earth wire C. Netural wire D. Fuse wire **Answer:** c ## Q28. Which gas is filled in normal tubelights? A. Sodium vapour with aragon B. Sodium vapour with neon C. Mercury vapour with argon D. Mercury vapour with neon **Answer:** c ## Q29. What gases are filled in fluorescent tube? A. Neon B. Sodium C. Mercury D. Mercury and neon **Answer:** d ## Q30. Which does the white light produce in the tube? A. Argon B. Nitrogen C. Carbon dioxide D. Both (A) and (B) **Answer:** d ## Q31. Fluorescent tubes are fitted with a choke. The choke coil A. Steps up the line voltage B. Steps down the line voltage C. Reduces current in the circuit D. Chokes low frequency current **Answer:** a ## Q32. A mobile phone charger is A. An inverter B. A UPS C. A step up transformer D. A step down transformer **Answer:** d ## Q33. If potential difference and current flowing through a wire is increased twice each, then electric power A. Will remain unaffected B. Will increase four times C. Will increase two times D. Will decrease half **Answer:** b ## Q34. Transformer is used for A. Converting AC into DC B. Converting DC into AC C. To step up DC voltages D. To step up or step down AC voltages **Answer:** d ## Q35. Alternate current is not preferable A. to charge storage batery B. To run /start an electric motor C. To transmit electric power D. To heat up electric toaster **Answer:** a ## Q36. The device used for converting alternating current to direct current is called A. Inverter B. Rectifier C. Transformer D. Tranmitter **Answer:** b ## Q37. Alternating current is converted to direct current A. By Dynamo B. By Motor C. By Transformer D. By Rectifier **Answer:** d ## Q38. The Earth's magnetic field is due to A. Currents circulating inside the core B. Presence of a huge magnet at its centre C. Moving charges inn space outside D. None of the above **Answer:** a --- Source: https://www.easy2crack.com/mcqs/physics/sound-quiz-T5Oyu0oo Site: https://www.easy2crack.com · Machine index: https://www.easy2crack.com/llms.txt · MCP: https://www.easy2crack.com/mcp