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You Are On Question Answer Bank SET 2025
101251. The instrument used to detect the presence and direction of flow of current is called?
Answer: galvanometer
101252. The property by which a conductor opposes the flow of electric current through it, is known as?
Answer: resistance
101253. Electric current is the flow of?
Answer: electrons
101254. The colour of earth wire is generally?
Answer: green
101255. The filament of an electric bulb is made up of tungsten because it possess?
Answer: high melting point and resistance
101256. Fuse wire is made up of?
Answer: Tin and Lead (solder)
101257. When large current passes through the fuse wire, it melts away. Why?
Answer: Due to the low melting point of tin - lead alloy
101258. A device used instead of fuse?
Answer: MCB (Miniature Circuit Breaker - It works on the Principle of magnetic effect of electric current)
101259. What is the unit of intensity of Magnetic field?
Answer: Tesla
101260. Rubber, plastic, paper, glass, mica etc. are electrical ...........?
Answer: insulators
101261. Power of an ordinary torch cell is?
Answer: 1.5 volt
101262. Magnetic effect of electric current was discovered by?
Answer: Oersted
101263. The law of electromagnetic induction have been used in the construction of a?
Answer: generator
101264. Which instrument is used to measure magnetic field?
Answer: Fluxmeter
101265. The device used for converting current from a lower voltage to a higher voltage is known as?
Answer: transformer
101266. What is electronics?
Answer: Study of behaviour of electrons; their control & use
101267. A material which allows only a feeble current to pass through it are called?
Answer: Semiconductors
101268. The process of adding certain impurities in the crystal structure of a semiconductor so as to improve its conductivity is called?
Answer: Doping
101269. The process of allowing electric current to flow in one direction only is?
Answer: Rectification
101270. What is Detection?
Answer: The process of extracting audio signals from the high frequency carrier waves is detection
101271. Which device converts alternating current (AC) to direct current (DC)?
Answer: Rectifier
101272. Which device convert DC to AC?
Answer: Electric oscillator
101273. ‘IC’ chip for computers are usually made of?
Answer: silicon
101274. The common constituent of transistor is?
Answer: germanium
101275. What is a sound?
Answer: Sound is a form of energy which produces the sensation of hearing
101276. Sound waves are?
Answer: longitudinal waves
101277. The Unit of loudness is?
Answer: Decibel
101278. The unit of intensity of light?
Answer: Lambert
101279. Sounds with frequencies lower than the lowest limit of human hearing are called?
Answer: infrasonic waves
101280. Sounds with frequency higher than 20,000 Hz are known as?
Answer: ultrasonic waves
101281. The audible frequency of human ear?
Answer: Between 20 hertz & 20;000 hertz
101282. Sounds are distinguished from each other by?
Answer: pitch (frequency) loudness (intensity) and quality
101283. Which waves are used in mobile phone?
Answer: Micro waves
101284. How is the sound produced?
Answer: By the vibration of material body
101285. What is frequency of sound?
Answer: The number of vibrations made by a body in one second is called its frequency
101286. Bat can fly at night because it produces?
Answer: Ultrasonic sound
101287. The distance travelled by a wave during the time a particle of the medium makes one vibrationis called?
Answer: Wave length
101288. The distance travelled by a wave in one second?
Answer: Velocity of the wave
101289. What are sound waves?
Answer: Longitudinal waves
101290. A wave motion in which the particles of the medium vibrate parallel to the direction of propagation of wave is?
Answer: Longitudinal
101291. The reflected sound is called?
Answer: Echo
101292. The apparatus used for measuring the depth of the sea on the basis of echo is called?
Answer: sonar
101293. How is the sound produced when we speak?
Answer: By the vibration of vocal cords
101294. Which sound is produced by Galton whistle?
Answer: Ultrasonic
101295. When a harmonium is played, how is the sound produced?
Answer: By the vibration of the reeds
101296. What is required for the propagation of sound?
Answer: Medium
101297. When the frequency of the sound wave is increased, what happens to its wave length?
Answer: Decreased
101298. Which unit is used to measure the frequency of sound?
Answer: Hertz
101299. Normal level of sound is?
Answer: 60-120 dB
101300. The maximum displacement of the particles of the medium from their equilibrium position?
Answer: Amplitude
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