Description : Which of the following radiations is the least penetrating? (A) α-rays (B) β-rays (C) γ-rays (D) X-rays
Last Answer : (A) α-rays
Description : Cobalt - 60 is used as a source of __________ in medical therapy & industrial radiography. (A) X-rays (B) γ-rays (C) α-rays (D) β-rays
Last Answer : (B) γ-rays
Description : When cathode rays strike a target of high atomic weight, they give rise to – 1) α -rays (2) β and γ rays (3) X-rays (4) positive rays
Last Answer : (3) X-rays Explanation: When cathode rays strike a solid target of high atomic weight and high melting point such as tungsten, molybdenum, etc, they give rise to a highly pen-etrating radiation called the X-rays (LIT Physics by Dr. P.K Aganval).
Description : Cathode rays when obstructed by metal cause emission of - (1) γ – ray (2) X – ray (3) α – ray (4) β – ray
Last Answer : B. X – ray
Description : Pick out the correct statement. (A) Positron is the antiparticle of electron (B) In α-decay, the ratio of neutron to proton decreases (C) Ionising power of β-rays is higher than that of α-rays (D) Speed of α-rays is more than that of γ-ray
Last Answer : (A) Positron is the antiparticle of electron
Description : The atomic number of a radioactive element is not changed, when it emits __________ rays. (A) α (B) β (C) γ (D) α & β
Last Answer : (C) γ
Description : Pick out the wrong statement. (A) Atoms with same number of nucleons but different number of protons are called isobars (B) Atoms with same number of protons but different number of nucleons are ... product formed by emission of α-particle has mass number less by 4 units than the parent nuclide
Last Answer : (B) Atoms with same number of protons but different number of nucleons are called isoters
Description : β-rays emission in radioactive disintegration is always accompanied by the emission of (A) γ-rays (B) α-rays (C) Neutrons (D) None of these
Last Answer : (A) γ-rays
Description : Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters? (A) I-131 (B) Sr-90 (C) Au-198 (D) Ra-226
Last Answer : (D) Ra-226
Description : Ozone layer above the surface of Earth provides a shield against – (1) X-rays (2) Ultra-violet rays (3) Gamma rays (4) Infra-red rays
Last Answer : (2) Ultra-violet rays Explanation: The Ozone layer absorbs 97-99% of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth.
Description : The light rays used for eliminating bacteria – (1) X-rays (2) infrared rays (3) microwave radiation (4) ultra-violet radiation
Last Answer : (4) ultra-violet radiation Explanation: Ultraviolet radiation is used to kill microorganisms, molds and fungus in various environmental applications. UV sterilization is used for air- ... water purification, aquarium and pond maintenance, laboratory hygiene and food and beverage protection.
Description : Which of the following has the highest energy? A. gamma rays (Answer) B. X-rays C. Ultra-violet radiation D. radio waves
Last Answer : A. gamma rays (Answer)
Description : Ozone layer above the surface of Earth provides a shield against (1) X-rays (2) Ultra-violet rays (3) Gamma rays (4) Infra-red rays
Last Answer : Ultra-violet rays
Description : The light rays used for eliminating bacteria (1) X-rays (2) infrared rays (3) microwave radiation (4) ultra-violet radiation
Last Answer : ultra-violet radiation
Description : Pick out the wrong statement. (A) Polymeric fibres are never produced by addition polymerisation (B) Property of tackiness is exhibited by uncured rubber (C) Sharp melting point is not observed in thermoplastic polymers (D) Polythene generally has an excellent resistance to ultra violet rays
Last Answer : (A) Polymeric fibres are never produced by addition polymerisation
Description : Pick out the wrong statement pertaining to 'green house' for the plants. (A) 'Green house' (made of glass) allows visible sunlight (i.e., short wavelength solar radiation like ultra-violet rays) ... ' thereby warming up the earth's surface (D) 'Green house' is colder than the outside atmosphere
Last Answer : (D) 'Green house' is colder than the outside atmosphere
Description : Ozone is (A) A primary pollutant (B) A secondary pollutant (C) Impervious to ultra-violet rays (D) Both (B) and (C)
Last Answer : (D) Both (B) and (C)
Description : Radiations which is not emitted during radioactivity is – (1) α rays (2) β rays (3) γ rays (4) Cathode rays
Last Answer : (4) Cathode rays Explanation: Radioactivity is the process by which a nucleus of an unstable atom loses energy by emitting particles of ionizing radiation. It includes the emission of energetic alpha particles (α), beta particles (β), and gamma rays.
Description : What do radioactive substances emit? (1) Radio waves (2) Infrared waves (3) Ultraviolet waves (4) α, β and γ rays
Last Answer : (4) α, β and γ rays Explanation: Of the three main types of radiation given off during radioactive decay, two are particles and one is energy; scientists call them alpha, beta and gamma after the first three letters of the Greek alphabet.
Description : ___________ remain undeflected in a magnetic field a) β particles b) α particles c) γ rays d) Proton beams
Last Answer : c) γ rays
Description : Is there an connection between commercial manicures and skin cancer/ultra violet rays?
Last Answer : https://www.reuters.com/article/us-dermatology-uv-light/are-nail-salon-uv-lamps-a-skin-cancer-risk-idUSKBN0DG1VC20140430 quote: NEW YORK (Reuters Health) - The ultraviolet lamps used in some ... month, lead author Dr. Lyndsay Shipp from Georgia Regents University in Augusta told Reuters Health.
Description : Consider the following statements: 1. The atmosphere of the primitive earth was reducing 2. The primary source of energy for the chemosynthetic reactions on earth that led to the origin of life was the solar energy 3. Liquid water did not ... 1 and 2 (b) 1 and 4 (c) 1, 2, and 3 (d) 1, 3, and 4
Last Answer : Ans:(d)
Description : The Ozone layer protects us from: (1) Cosmic rays (2) Ultra-Violet rays (3) Visible rays (4) Infrared rays
Last Answer : (2) Ultra-Violet rays Explanation: The ozone layer refers to a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet (UN) radiation. It absorbs 97- 99% of the Sun's ... 200 nm to 315 nm wavelength), which otherwise would potentially damage exposed life forms near the surface.
Description : (3) checking the penetration of ultra-violet rays to the earth Explanation: Ozone in the ozone layer filters out sunlight wavelengths from about 200 nm UV rays to 315 nm, with ozone peak absorption at about 250 nm. This ... the lower UV-C (200 nm-280 nm) and the entire UV-B band (280 nm-315 nm).
Last Answer : The advantage of detergents over soaps is – (1) Detergents are soluble in water (2) Detergents could not give much lather (3) Detergents give lather even with hard water (4) Soaps give lather with only soft water
Description : (1) the action of ultraviolet rays on oxygen Explanation: The majority of tropospheric ozone formation occurs when nitrogen oxides (NOx), carbon monoxide (CO ) and volatile organic compounds (VOCs), such as xylene, ... violet rays. NOx, CO, and VOCs are called ozone precursors. CO + 2O2 + CO2 + O3
Last Answer : Water is not effective in extinguishing a fire caused by petrol because - (1) the flame is too hot for water to cool it down (2) water and petrol react chemically (3) water and petrol are ... (4) water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
Description : Which of the following has the lowest frequency? (1) Visible light (2) Gamma rays (3) Xrays (4) Ultra violet rays
Last Answer : (1) Visible light Explanation: The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide over current protection of an electrical circuit ... or strip that melts when too much current flows through it, thereby interrupting the flow of current.
Description : In a filament type light bulb most of the electric power consumed appears as – (1) visible light (2) infra-red rays (3) ultra-violet rays (4) fluorescent light
Last Answer : (2) infra-red rays Explanation: When electricity is passed through the filament, the filament gets hot. Depending on the temperature of the filament, radiation is emitted from the filament. The ... energy converts into visible light and rest of it is emitted as heat or infrared radiation.
Description : The ozone layer protects us from - (1) Ultra violet rays (2) Radio waves (3) Visual radiation (4) Infrared radiation
Last Answer : (1) Ultra violet rays Explanation: The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
Description : Which of the following parts of the sunlight makes the solar cooker hot? (1) Ultra violet (2) Red light (3) Infra red (4) Cosmic rays
Last Answer : (3) Infra red Explanation: Glass transmits visible light but blocks infrared thermal radiation from escaping. This amplifies the heat trapping effect. A solar cooker, or solar oven, is a device which ... The vast majority of the solar cookers presently in use are relatively cheap, low-tech devices.
Description : Night vision is possible with the help of ------? A. Red light B. Violet light C. Infrared Rays (Answer) D. Ultra violet Light E. None of these
Last Answer : C. Infrared Rays (Answer)
Last Answer : Ultra-Violet rays
Description : The presence of ozone in the stratosphere is responsible for (1) increasing the average global temperature in recent years (2) higher rate of photosynthesis (3) checking the penetration of ultra-violet rays to the earth (4) supplying oxygen for people travelling in jets
Last Answer : checking the penetration of ultra-violet rays to the earth
Last Answer : Visible light
Description : In a filament type light bulb most of the electric power consumed appears as (1) visible light (2) infra-red rays (3) ultra-violet rays (4) fluorescent light
Last Answer : infra-red rays
Description : Which of the following parts of the sunlight makes the solar cooker hot ? (1) Ultra violet (2) Red light (3) Infra red (4) Cosmic rays
Last Answer : Infra red
Description : The region of the electromagnetic spectrum immediately above the frequencies to which the human eye is sensitive is called: w) ir x) ultra-violet y) rf z) gamma ray
Last Answer : ANSWER: X -- ULTRA-VIOLET
Description : The region of the electromagnetic spectrum immediately above the frequencies to which the human eye is sensitive is called: A. I r B. ultra-violet C. r f D. gamma ray
Last Answer : B. ultra-violet
Description : The mass number of an element is not changed, when it emits __________ radiations. (A) α & β (B) β & γ (C) γ & α (D) α, β, & γ
Last Answer : (B) β & γ
Description : Of the following, the most energetic form of NON-IONIZING radiation is: w) ultra-violet light x) infra-red light y) radar z) microwaves
Last Answer : ANSWER: W -- ULTRA-VIOLET LIGHT
Description : Which of the following accounts for the maximum energy release in the nuclear fission process? (A) Kinetic energy of fission products (B) Radioactive decay of fission products (C) Instantaneous release of γ-rays (D) Kinetic energy of neutrons
Last Answer : (A) Kinetic energy of fission products
Description : If α, β and γ are coefficients of linear, area l and volume expansion of a solid then
Last Answer : If α, β and γ are coefficients of linear, area l and volume expansion of a solid then (A) α:β:γ 1:3:2 (B) α:β:γ ... C) α:β:γ 2:3:1 (D) α:β:γ 3:1:2
Description : The mammalian DNA polymerase involved in error correction is (A) DNA polymerase α (B) DNA polymerase β (C) DNA polymerase γ (D) DNA polymerase δ
Last Answer : Answer : B
Description : Replication of nuclear DNA in mammals is catalysed by (A) DNA polymerase α (B) DNA polymerase β (C) DNA polymerase γ (D) DNA polymerase III
Last Answer : Answer : A
Description : The immediate parent of α, β and γ endorphins is (A) Pro-opiomelanocortin (B) β-lipotropin (C) ATCH (D) Lipoprotein
Description : Insulin receptor is made up of (A) One α-and one β-subunit (B) Two α-and two β-subunit (C) Two, α two β-and two γ-subunit (D) One α, one β-one γ-and one δ-subunit
Description : In the insulin receptor, tyrosine kinase domain is present in (A) α-Subunits (B) β-Subunits (C) γ-Subunits (D) δ-Subunits
Description : Insulin binding sites are present on the (A) α-subunits of insulin receptor (B) β-subunits of insulin receptor (C) γ-subunits of insulin receptor (D) α-and β−subunits of insulin receptor
Description : All of the following can be formed from pro-opiomelanocortin except (A) α-and β-MSH (B) β-and γ-Lipotropins (C) α-and β-Endorphins(D) FSH
Last Answer : Answer : D
Description : The nucleotide binding site of G-proteins is present on their (A) α-Subunit (B) β-Subunit α- and β- (C) γ-Subunit (D) δ-Subunit