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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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