You Are On Question Answer Bank SET 2025
101251. The instrument used to detect the presence and direction of flow of current is called?
101252. The property by which a conductor opposes the flow of electric current through it, is known as?
101253. Electric current is the flow of?
101254. The colour of earth wire is generally?
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?
101260. Rubber, plastic, paper, glass, mica etc. are electrical ...........?
101261. Power of an ordinary torch cell is?
Answer: 1.5 volt
101262. Magnetic effect of electric current was discovered by?
101263. The law of electromagnetic induction have been used in the construction of a?
101264. Which instrument is used to measure magnetic field?
101265. The device used for converting current from a lower voltage to a higher voltage is known as?
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?
101268. The process of adding certain impurities in the crystal structure of a semiconductor so as to improve its conductivity is called?
101269. The process of allowing electric current to flow in one direction only is?
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)?
101272. Which device convert DC to AC?
Answer: Electric oscillator
101273. ‘IC’ chip for computers are usually made of?
101274. The common constituent of transistor is?
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?
101278. The unit of intensity of light?
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?
101291. The reflected sound is called?
101292. The apparatus used for measuring the depth of the sea on the basis of echo is called?
101293. How is the sound produced when we speak?
Answer: By the vibration of vocal cords
101294. Which sound is produced by Galton whistle?
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?
101297. When the frequency of the sound wave is increased, what happens to its wave length?
101298. Which unit is used to measure the frequency of sound?
101299. Normal level of sound is?
Answer: 60-120 dB
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101300. The maximum displacement of the particles of the medium from their equilibrium position?
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