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You Are On Question Answer Bank SET 2026
101301. How is Echo produced?
Answer: By the reflection of sound
101302. A wave in which particles of the medium vibrate perpendicular to the direction of propagation of the wave is?
Answer: Transverse wave
101303. How is the speed of supersonic plane expressed?
Answer: Mach number
101304. Supersonic plane fly with the speed?
Answer: Greater than the speed of sound
101305. When will the sound be painful to the ears?
Answer: When the sound is above 120 dB
101306. What are the essential characteristics of a wave?
Answer: Wave length; amplitude; frequency and velocity
101307. What is known as the study of sound?
Answer: Acoustics
101308. Which property of sound is affected by change in air temperature?
Answer: Wavelength
101309. Which property of a wave is independent of the other?
Answer: Amplitude
101310. Why an astronaut can’t hear his companion at the surface of the moon?
Answer: There is no medium for sound propagation
101311. Ultrasonic waves are produced by?
Answer: Piezo electric effect
101312. When mechanical waves have a frequency below the audible range it is known as?
Answer: Infrasonics
101313. Which wave are used in sonography?
Answer: Ultrasonic
101314. When mechanical waves have a frequency above the audible range it is known as?
Answer: Ultrasonics
101315. What is the velocity of sound in air?
Answer: 300 m/s
101316. In which medium the velocity of sound is maximum?
Answer: Steel
101317. What is the velocity of sound in vacuum (in m/s)?
Answer: 0
101318. With the rise in temperature, velocity of sound?
Answer: Increases
101319. The velocity of sound in any gas depends upon its?
Answer: Density and Elasticity
101320. The energy produced in a nuclear reactor is on account of?
Answer: nuclear fission
101321. " ഇന്ത്യയിലെ ഇംഗ്ലീഷ് ചാനൽ " എന്നറിയപ്പെട്ടിരുന്ന നദി ഏതായിരുന്നു [" inthyayile imgleeshu chaanal " ennariyappettirunna nadi ethaayirunnu]
Answer: മയ്യഴി പുഴ [Mayyazhi puzha]
101322. " കേരളത്തിലെ ഗംഗ " എന്നറിയപ്പെടുന്ന നദി ഏതാണ് [" keralatthile gamga " ennariyappedunna nadi ethaanu]
Answer: പമ്പ [Pampa]
101323. The age of rocks and fossils can be calculated through?
Answer: carbon dating
101324. The first man made element is?
Answer: Technitium
101325. Which element is usually used in radiation theraphy?
Answer: Cobalt - 60
101326. The first atomic reactor in India is?
Answer: Apsara (Maharashtra - Trombay)
101327. India’s first fast breeder reactor is at?
Answer: Kalpakkom in Tamilnadu
101328. മനുഷ്യൻ ആദ്യമായി ബഹിരാകാശ യാത്ര നടത്തിയ വർഷം? [Manushyan aadyamaayi bahiraakaasha yaathra nadatthiya varsham?]
Answer: 1961 ( യൂറി ഗഗാറിൻ ) [1961 ( yoori gagaarin )]
101329. കേരള പോസ്റ്റൽ സർക്കിൾ പ്രവർത്തനം ആരംഭിച്ചവർഷം [Kerala posttal sarkkil pravartthanam aarambhicchavarsham]
Answer: 1961
101330. In the interior of the sun, which reaction takes place?
Answer: Nuclear fusion
101331. In the core of the sun, hydrogen nuclei fuse together to form which nuclei?
Answer: Helium
101332. ഗാലപ്പഗോസ് ദ്വീപ് സ്ഥിതി ചെയ്യുന്നത് ഏത് രാജ്യത്താണ് [Gaalappagosu dveepu sthithi cheyyunnathu ethu raajyatthaanu]
Answer: ഇക്വഡോർ [Ikvador]
101333. The radiation which is not affected by the magnetic field or electric field is?
Answer: GAMA rays
101334. A metal which can absorb and stop radioactive radiations:?
Answer: Lead
101335. " അൽമാ ജസ്റ്റ് " എന്ന ജ്യോതിശാസ്ത്ര ഗ്രന്ഥം രചിച്ചത് ആരായിരുന്നു [" almaa jasttu " enna jyothishaasthra grantham rachicchathu aaraayirunnu]
Answer: ടോളമി [Dolami]
101336. When a nucleus emits a beta particle its atomic number:?
Answer: Increases by one
101337. When a nucleus emits a beta particle it always emits?
Answer: Anti neutrino
101338. Which is the element with the greatest half life period?
Answer: Urnanium - 238
101339. Artificial radioactivity was first discovered by?
Answer: Irene Joliot Curie and Frederic Joliot
101340. The radiations which can penetrate most through substances are?
Answer: Gamma rays
101341. The radio isotope formed in the atmosphere due to the action of cosmic rays is?
Answer: Carbon 14
101342. An isotope which is used in the production of radio pharmaceutical substance is?
Answer: Oxygen 15
101343. When an alpha particle is emitted the atomic number of isotope?
Answer: Decreases by two
101344. When a nucleus emits a beta particle the mass number of atom?
Answer: Remains the same
101345. The half life period of Carbon 14 is:?
Answer: 5760 years
101346. Reactions involving changes in the nucleus are called?
Answer: Nuclear energy
101347. Pitch blende is the ore of?
Answer: Uranium
101348. Which radiation exhibit highest ionizing power?
Answer: Alpha rays
101349. The scientist who showed that radioactive isotope may give off three types of radiation was?
Answer: Rutherford
101350. Alpha particle is the nucleus of which atom?
Answer: Helium
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