Description : Pick out the wrong statement. (A) Biological oxygen demand (B.O.D.) value of a sewerage sample is always lower than its chemical oxygen demand (C.O.D.) value (B) Environmental pollution by ... in but does not allow the short wavelength infra red radiation to escape out of the earth's atmosphere
Last Answer : (D) The characteristic of a green house body is that it allows the long wavelength incoming solar radiation to come in but does not allow the short wavelength infra red radiation to escape out of the earth's atmosphere
Description : The rate of emission of radiation by a body does not depend upon the (A) Wavelength of radiation (B) Surface temperature of the body (C) Nature of the surface (D) Shape and porosity of the body
Last Answer : (D) Shape and porosity of the body
Description : A nuclide of an alkaine earth metal undergoes radioactive deacy by emission of the `alpha-` particles in sucession. The group of the periodic tablle t
Last Answer : A nuclide of an alkaine earth metal undergoes radioactive deacy by emission of the `alpha-` particles in ... 6th group C. 14 th group D. 16th group
Description : When `._(13)^(27)Al` is bombarded whith `alpha`-particles, a radioactive isotope of phosphorus `._(15)^(30)P` with the emission of …. Is formed
Last Answer : When `._(13)^(27)Al` is bombarded whith `alpha`-particles, a radioactive isotope of phosphorus ` ... A. neutrons B. protons C. positrons D. electrons
Description : A radioactive substance does not undergo any change (in mass or charge) during – (1) ganuna-emission (2) oxidation (3) alpha-emission (4) beta-emission
Last Answer : (1) ganuna-emission Explanation: Gamma-rays do not carry any charge. These rays do not have any mass and hence can not be considered to be made up of particles.
Description : Pick out the wrong statement. (A) α-particle emission from a radioactive element makes it electrically negative (B) β-particle emission from a radioactive element makes it electrically ... ) The disintegration constant of a radioactive isotope is independent of pressure, temperature or concentration
Last Answer : (C) A radioactive element having a half life period of 20 years will completely disintegrated in 40 years
Description : The phenomenon of nuclear fission is opposite to that of (A) Radioactive decay (B) Thermionic emission (C) Nuclear fusion (D) Combustion
Last Answer : (C) Nuclear fusion
Description : Emission of β-particles during radioactive decay of a substance is from (A) Innermost shell (B) Nucleus (C) Outermost shell (D) None of these
Last Answer : (B) Nucleus
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 : Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV. (A) 0.8 (B) 7.8 (C) 200 (D) 10000
Last Answer : (A) 0.8
Description : In radioactive decay, the emission of an electron is characteristic of: w) Alpha decay x) Beta decay y) Gamma decay z) X-rays
Last Answer : ANSWER: X -- BETA DECAY
Description : The emission of a positron from a radioactive atom is generally accompanied by the emission of one of the following. Is it accompanied by the emission of: w) a meson x) a baryon y) an antineutrino z) a neutrino
Last Answer : ANSWER: Z -- A NEUTRINO
Description : A radioactive substance does not undergo any change (in mass or charge) during (1) gamma-emission (2) oxidation (3) alpha-emission (4) beta-emission
Last Answer : gamma-emission
Description : Monazite sample contains 9% `ThO""_(2)` and 0.35% `U""_(3)O""_(8).Pb""^(208)` and `Pb""^(206)` are the stable and products in the radioactive decay se
Last Answer : Monazite sample contains 9% `ThO""_(2)` and 0.35% `U""_(3)O""_(8).Pb""^(208)` and `Pb ... C. It is a fertile material D. It belongs to 4n series
Description : Let `T` be the mean life of a radioactive sample. `75%` of the active nuclei present in th sample initially will deacy in time
Last Answer : Let `T` be the mean life of a radioactive sample. `75%` of the active nuclei present in th sample initially will ... ` C. 4T D. `2 (log_(e) 2) T`
Description : A sample of radioactive material has mass `m`, decay constant `lambda`, and molecular weight `M`. Avogadro constant `=N_(A)`. The initial activity of
Last Answer : A sample of radioactive material has mass `m`, decay constant `lambda`, and molecular weight `M`. Avogadro constant ... N_(4))/(M)` D. `mMe^(lambda)`
Description : A radioactive sample has a half life 1500 years. A sealed tube conataining 1g of the sample will contain after 3000 years,
Last Answer : A radioactive sample has a half life 1500 years. A sealed tube conataining 1g of the sample will contain ... g of the sample D. 0.01g of the sample
Description : If a radioactive sample has decayed until only one eighth of the original sample remains unchanged how many half-lives have elapsed?
Last Answer : 3
Description : What name is given to the time taken for half the atoms in a sample of a radioactive isotope to decay?
Last Answer : Half-life
Description : According to Bohr's theory, an electron in one Bohr stationary orbit can go to a higher stationary orbit (a) By emission of electromagnetic radiation (b) Without any absorption ... absorption of any electromagnetic radiation (d) With absorption of electromagnetic radiation of a particular frequency
Last Answer : Ans:(d)
Description : ____ is defined as any radiation of energy by means of electromagnetic wave. A. Emission B. Radiation C. Radio D. Broadcasting
Last Answer : A. Emission
Description : Emission on a frequency or frequencies immediately outside the necessary bandwidth which result from the modulation process except spurious emission. A. Radiation B. Noise C. Out of the band D. Interference
Last Answer : C. Out of the band
Description : Production of radiation by a radio transmitting station A. Monitoring B. Emission C. Radiation D. Transmission
Last Answer : B. Emission
Description : The main purpose of control rod in a nuclear reactor is to control the (A) Chain reaction and hence the power output by regulating the number of secondary neutrons causing fission (B) ... radiation (C) Conversion of fissile material into fertile material (D) Velocity of the secondary neutrons
Last Answer : (A) Chain reaction and hence the power output by regulating the number of secondary neutrons causing fission
Description : Pick out the wrong statement. (A) Heat transfer from a hot body to cold body by the emission of heat waves is called radiation (B) Filmwise condensation takes place on non-wettable surfaces (C) The ... of a solution is affected by liquid head as well as boiling point elevation (D) None of these
Last Answer : (B) Filmwise condensation takes place on non-wettable surfaces
Description : Which one of the following statements is correct? (A) During the day, earth reflects solar radiation (B) During the day, earth reflects both solar radiations the emission from its surface (C) During the night, earth emits radiation from its surface (D) All of these
Last Answer : Answer: Option D
Description : Which one of the following statements regarding remote sensing is correct? (A) The interaction of the electromagnetic radiation with the target (B) The emission of electromagnetic radiation from the target (C) Both (a) and (b) (D) Neither (a) nor (b
Last Answer : Answer: Option C
Description : A process by which heat is transferred through a material without a bulk movement of the material. a. Convection b. Conduction c. Radiation d. Emission
Last Answer : Conduction
Description : LASER stands for: a. Light Amplification by Simulated Emission of Radiation b. Light Amplification by Stimulated Emission of Radiation c. Light Amplification by Simulated Emitted Rays d. Light Amplification by Stimulated Emitted Rays
Last Answer : b. Light Amplification by Stimulated Emission of Radiation
Description : Laser is the acronym for a) Light Amplification by Stimulated Emission of Radiation b) Light Amplification by Spontaneous Emission of Radiation c) Light Amplified by Stimulated Emission of Radiation d) Light Amplification by Standard Emission of Radiation
Last Answer : a) Light Amplification by Stimulated Emission of Radiation
Description : LED stands for _________ A. Low Emission Display B. Liquid Emitting Display C. Less Emitting Diode D. Light Emitting Diode
Last Answer : D. Light Emitting Diode
Description : A frheshly prepared radioactive source of half life 2 hrs emits radiation of intensity which is 32 times the permissible safe value of intensity. Whic
Last Answer : A frheshly prepared radioactive source of half life 2 hrs emits radiation of intensity which is 32 times the ... B. 5hrs C. 10 hrs D. 32 hrs
Description : If by mistake radioactive substance gets into human body, then from the point of view of radiation damage, the most harmful will be one that emits.
Last Answer : If by mistake radioactive substance gets into human body, then from the point of view of radiation damage, ... neutrons C. `beta`-rays D. `alpha`-rays
Description : The radiation from naturally occuring radioactive substance as seen after deflection by a magnetic field in one direction are :
Last Answer : The radiation from naturally occuring radioactive substance as seen after deflection by a magnetic field in one ... D. either `alpha` or `beta`-rays
Description : Why Deinococcusradiodurans is able to survive massive exposure to radiation? A- .Because it produces a thick shell which acts as a shield from the radiation B- Because it has unique DNA repair ... its cellwall contains radioactive elements D- Because it has many copies of genes encoding DNA repair
Last Answer : Because it has many copies of genes encoding DNA repair
Description : Most of what we call background radiation comes from two sources. One is the naturally radioactive elements around us. What is the other source?
Last Answer : ANSWER: COSMIC RADIATION
Description : Which physical phenomenon or principle is most often applied in the search for petroleum reservoirs? w) magnetic field distortions x) electromagnetic radiation y) natural radioactive decay of minerals z) acoustic wave transmission and reflection
Last Answer : ANSWER: Z -- ACOUSTIC WAVE TRANSMISSION AND REFLECTION
Description : If a manufacturer is trying to put together a sample collection of her product and order is not important how many combinations can be created with 15 items that will be placed in packages containing?
Last Answer : Need answer
Description : A drop of each of the following, is placed separately on four slides. Which of them will not coagulate? (a) Blood serum (b) Sample from the thoracic duct of lymphatic system (c) Whole blood from pulmonary vein (d) Blood plasma
Last Answer : (a) Blood serum
Description : Monochromatic radiation of wavelength `lambda` is incident on a hydrogen sample in ground state. hydrogen atoms absorb a fraction of light and subsequ
Last Answer : Monochromatic radiation of wavelength `lambda` is incident on a hydrogen sample in ground state. ... different wavelength .Find the value of `lambda`
Description : The process of drawing a sample from a population is known as _________. a. Sampling b. Census c. Survey research d. None of the above
Last Answer : a. Sampling
Description : The type of sampling in which each member of the population selected for the sample is returned to the population before the next member is selected is called _________. a. Sampling without replacement b. Sampling with replacement c. Simple random sampling d. Systematic sampling
Last Answer : b. Sampling with replacement
Description : By which of the following methods could a cup of hot coffee lose heat if placed on a metal table in a room? (a) Conduction and radiation (b) Conduction and convection (c) Convection and radiation (d) Conduction, convection, radiation and evaporation
Description : The rotor slots of a repulsion-type motor are generally skewed (placed nonparallel to the rotor axis) to _________. A. produce a constant starting torque B. permit a greater air gap with the starter C. permit a smaller air gap with the starter D. reduce eddy current losses
Last Answer : Answer: A
Description : _________ is the transition of a given substance from the solid to the gas phase with no intermediate liquid stage. a. Convection b. Conduction c. Radiation d. Sublimation
Last Answer : Sublimation
Description : A half wavelength Dipole antenna has _________ Radiation Pattern a. Hemispherical b. Omni-Directional c. Isotropic d. End fire
Last Answer : A half wavelength Dipole antenna has Omni-Directional Radiation Pattern
Description : Width of frequency band just enough to ensure the transmission of information at a required rate and quality required, and under a specified condition and class of emission. A. Occupied bandwidth B. Transmission bandwidth C. Necessary bandwidth D. Frequency bandwidth
Last Answer : C. Necessary bandwidth
Description : The width of the frequency band which is just sufficient to ensure the transmission of information at the rate and with the quality required under a specified condition and class of emission. A. Occupied bandwidth B. Reference frequency C. Necessary bandwidth D. Frequency tolerance bandwidth
Description : Secondary cooling circuit is a must in molten sodium cooled fast breeder reactor for (A) Achieving high degree of superheat in the steam (B) Faster heat removal rate from the core (C) ... circulation pressure (D) Avoiding the mixing of water with radioactive sodium, as it may cause explosion
Last Answer : (D) Avoiding the mixing of water with radioactive sodium, as it may cause explosion