Description : Pick out the wrong statement. (A) The X-rays cannot be deflected by electric field unlike cathode rays (B) The intensity of X-rays can be measured by ionisation current produced due to the ... the anode-cathode voltage (D) Crystal structure of a material can be studied by an electron microscope
Last Answer : (C) The quality of X-rays can be controlled by varying the anode-cathode voltage
Description : __________ is used for examining the macro-structure of a material. (A) Metallurgical microscope (B) Optical microscope (C) X-rays (D) Visual inspection by naked eye
Last Answer : (D) Visual inspection by naked eye
Description : Which one of the following techniques made it possible to genetically engineer living organisms? (a) Recombinant DNA techniques (b) X-ray diffraction (c) Heavier isotope labelling (d) Hybridization
Last Answer : (a) Recombinant DNA techniques
Description : Nucleotide arrangement in DNA can be seen by (a) X-ray crystallography (b) electron microscope (c) ultracentrifuge (d) light microscope
Last Answer : (a) X-ray crystallography
Description : How does X-ray diffraction aid in the understanding of the structure of molecules?
Last Answer : X-ray diffraction is the investigative use of X-rays to discoverthe internal structure of a number of different things. The basicapproach is to set up a target material and direct a beam ... a broad field with diverging and complex investigativetechniques. Even so, the fundamentals remain the same.
Description : The internal structure of crystals was first studied with which of the following? w) x-rays x) isotopes y) electron microscopes z) lasers
Last Answer : ANSWER: W -- X-RAYS
Description : Bacillus thuringiensis (Bt) strains have been used for designing novel (a) biofertilizers (b) bio-metallurgical techniques (c) bio-mineralization processes (d) bioinsecticidal plants.
Last Answer : (d) bioinsecticidal plants.
Description : Using X-ray crystallography, this woman scientist determined the structures of large biochemical molecules, including penicillin in 1949 and vitamin B12 in 1956. In 1969 she determined the three ... X-ray techniques of the structures of important biochemical substances." Name this woman scientist.
Last Answer : ANSWER: (DOROTHY) CROWFOOT HODGKIN
Description : (a) granular structure (b) first observed under the electron microscope as dense particles by Geprge Palade ( c ) composed of RNA and proteins not sur
Last Answer : (a) granular structure (b) first observed under the electron microscope as dense particles by ... Nucleolus B. Ribosomes C. Cristae D. Chloroplast
Description : What is viewed through an electron microscope? (1) Electrons and other elementary particles (2) Structure of bacteria and viruses (3) Inside of human stomach (4) Inside of the human eye
Last Answer : (2) Structure of bacteria and viruses Explanation: Electron microscopes are used to observe a wide range of biological and inorganic specimens including microorganisms, cells, large molecules, ... microscope because electrons have wavelengths about 100,000 times shorter than visible light photons.
Last Answer : Structure of bacteria and viruses
Description : Cells are commonly studied in the lab. If you were examining various unlabelled slides of cells under the microscope, you could tell if the cell was from a plant by the presence of (A) A nucleus (B) A cell membrane (C) Cytoplasm (D) A cell wall
Last Answer : (D) A cell wall
Description : A spectroscopic instrument can resolve two nearly wavelength `lambda and lambda = Delta lambda if lambda//Delta lambda` is smaller than `8000` This is
Last Answer : A spectroscopic instrument can resolve two nearly wavelength `lambda and lambda = Delta lambda if ... many lines will be resolved by the instrument?
Description : In a protein molecule the disulphide bond is not broken by (A) Reduction (B) Oxidation (C) Denaturation (D) X-ray diffraction
Last Answer : Answer : C
Description : X-ray diffraction can be observed by using __________. A. Diffraction Grating B. Rock salt crystal C. Convex lens D. Michelson’s interferometer
Last Answer : A. Diffraction Grating
Description : significant diffraction of X ray can be obtained A. By a single slit B. By a double slit C. By diffraction D. By Atomic crystal
Last Answer : A. By a single slit
Description : Hawthorne studies A. Recognizes that the appropriate management actions depend on the situation B. Studied the relationship of lighting levels to worker productivity. C. Involves the use of quantitative techniques to improve management decision making. D. None of these options is correct
Last Answer : Studied the relationship of lighting levels to worker productivity.
Description : The Management Science Approach . A. Recognizes that the appropriate management actions depend on the situation B. Studied the relationship of lighting levels to worker productivity. C. ... quantitative techniques to improve management decision making. D. None of these options is correct
Last Answer : Involves the use of quantitative techniques to improve management decision making.
Description : Hawthorne studies A. Recognizes that the appropriate management actions depend on the situation B. Studied the relationship of lighting levels to worker productivity. C. Involves the use of quantitative techniques to improve management decision making. D. None of these options is correct.
Description : The Management Science Approach . A. Recognizes that the appropriate management actions depend on the situation B. Studied the relationship of lighting levels to worker productivity. C. ... quantitative techniques to improve management decision making. D. None of these options is correct.
Last Answer : Involves the use of quantitative techniques to improve management decision making
Description : Which of the following scientific instruments has the greatest resolving power? w) electron microscope x) light microscope y) phase-contrast microscope z) centrifuge
Last Answer : ANSWER: W -- ELECTRON MICROSCOPE
Description : A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers. (1) reflection (2) refraction (3) diffraction (4) total internal reflection
Last Answer : (4) total internal reflection Explanation: If the angle of incidence of light ray in the denser medium is greater than the critical angle of the concerned media pair, the light is not at all reflected in to the rarer medium but is totally reflected. This is known as 'total internal reflection'.
Description : The waveform of a certain signal can be studied by – (1) Spectrometer (2) Cathode ray oscilloscope (3) p - n junction diode (4) Sonometer
Last Answer : (4) Sonometer Explanation: A spectrometer is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. Cathode ray oscilloscope is an electronic display ... electron beam that is used to produce visible patterns or graphs on a phosphorescent screen.
Last Answer : total internal reflection
Description : The waveform of a certain signal can be studied by (1) Spectrometer (2) Cathode ray oscilloscope (3) p – n junction diode (4) Sonometer
Last Answer : Sonometer
Description : Which one of the following techniques is safest for the detection of cancers? (a) Magnetic resonance imaging (MRI) (b) Radiography (X-ray) (c) Computed tomography (CT) (d) Histopathological studies
Last Answer : (a) Magnetic resonance imaging (MRI)
Description : Other than electrons, what else can you magnify and view with an electron microscope?
Last Answer : My Paycheck
Description : On which property of electrons does the electron microscope work?
Last Answer : Answer: Wave nature.
Description : What is the magnification of an electron microscope?
Last Answer : Answer: 100000.
Description : What is the difference between a Light Microscopes and an Electron Microscope?
Last Answer : The optical microscope is the most common. It uses light to image a sample that is too small to be seen by the naked eye.The scanning electron microscope examines the surface of objects using an electron beam and measuring reflection.Short Answer = Resolution.
Description : What is the difference between how a light microscope magnifies an image and how an electron microscope magnifies an image?
Last Answer : What is the answer ?
Description : How many electron microscope in Pakistan and which place?
Last Answer : 1
Description : Under the electron microscope, you observe a cell with three different types of large organelles, each bounded by two membranes. The cell is most likely (a) A plant (b) An animal (c) A fungus (d) A bacterium
Last Answer : Ans:(a)
Description : An electron microscope gives higher magnification than an optical microscope, because: (1) It uses more powerful lenses (2) the velocity of electron is smaller than that of visible (3) the ... particles (4) the wavelength of electrons is smaller as compared to the wavelength of visible light
Last Answer : (4) the wavelength of electrons is smaller as compared to the wavelength of visible light Explanation: An electron microscope uses a beam of electrons to illuminate a specimen and produce a ... photons. Magnification is the process of enlarging something only in appearance, not in physical size.
Description : An electron microscope gives higher magnifications than an optical microscope because - (1) The velocity of electrons is smaller than that of light (2) The wavelength of electrons is smaller as ... have more energy than the light particulars (4) The electron microscope uses more powerful lenses
Last Answer : (2) The wavelength of electrons is smaller as compared to the wavelength of visible light Explanation: An electron microscope is a microscope that uses a beam of accelerated electrons as a spume ... a higher resolving power than a light microscope and can reveal the structure of smaller objects.
Description : Electron microscope was invented by – (1) Knoll and Ruska (2) Robert. Koch (3) Lecuwenhock (4) C.P. Swanson
Last Answer : (1) Knoll and Ruska Explanation: It is widely accepted that the first prototype of an electron microscope was built by Ernst Ruska and Max Knoll in 1931; it was not more powerful than an ... . An electron microscope uses a beam of electrons to illuminate a specimen and produce a magnified image.
Description : Electron Microscope is more magnifier than light microscope because –
Last Answer : Wavelength of electron is less than the wavelength of light
Description : The construction of electron microscope was based on?
Last Answer : Dual Nature of Matter
Description : Write a note on Electron Microscope?
Last Answer : This is advanced microscope. Its resolving power is 250 times more than a normal microscope. In this microscope a beam of electrons under high voltage is passed through object for making ... Electron microscope has a capacity to magnify an object upto 250000 times than its original size.
Description : Genetic engineering is possible, because (a) we can cut DNA at specific sites by endonucleases like DNase I (b) restriction endonucleases purified from bacteria can be used in vitro (c) the phenomenon of transduction in bacteria is well understood (d) we can see DNA by electron microscope
Last Answer : (b) restriction endonucleases purified from bacteria can be used in vitro
Description : What are the structures called that give an appearance as ‘beads-on-string’ in the chromosomes when viewed under electron microscope? (a) Genes (b) Nucleotides (c) Nucleosomes (d) Base pairs
Last Answer : Nucleosomes
Description : Electron microscope has a high resolution power. This is due to (a) electromagnetic lenses (b) very low wavelength of electron beam (c) low wavelength of light source used (d) high numerical aperture of glass lenses used.
Last Answer : (b) very low wavelength of electron beam
Description : A major breakthrough in the studies of cells came with the development of electron microscope. This is because (a) the electron microscope is more powerful than the light microscope as it ... (d) electron beam can pass through thick materials, whereas light microscopy requires thin sections.
Last Answer : (b) the resolving power of the electron microscope is much higher than that of the light microscope
Description : The _____ microscope would be used to view cell structures within ultrathin sections of cells. a. scanning electron b. transmission electron c. bright-field d. dark-field
Last Answer : b. transmission electron
Description : If you wanted to study the surface of a bacterial cell, you would use a. A transmission electron microscope. b. A light microscope with phase-contrast optics. c. A scanning electron microscope. d. A light microscope with dark-field optics.
Last Answer : c. A scanning electron microscope.
Description : If you wanted to study bacterial motility you would most likely use a. A transmission electron microscope. b. A tight microscope with dark-field optics. c. A scanning electron microscope. d. A light microscope with phase-contrast optics.
Last Answer : a. A transmission electron microscope.
Description : What type of microscope is usually necessary for observing viruses? A Dark field microscope B Phase contrast microscope C Electron microscope D Compoundmicroscope
Last Answer : C Electron microscope
Description : A three dimensional image is obtained by a)Electron microscope b) Scanning electron microscope c) Magnetic imaging d)None of these
Last Answer : b) Scanning electron microscope
Description : Who invented Electron Microscope and what was its use?
Last Answer : Ans: Knoll and Ruska invented Electron Microscope. It is used to know the finer details of the cell