Description : Which of the following HPLC detectors is used as a bulk property or general purpose detector? A. Electrochemical detector B. Fluorescence detector C. UV-Visible detector D. Evaporative Light scattering detector
Last Answer : D. Evaporative Light scattering detector
Description : Indicate the HPLC detector that is most sensitive to change in temperature : (A) PDA detector (B) Refractive Index detector (C) Electrochemical detector (D) Fluorescence detector
Last Answer : (B) Refractive Index detector
Description : Which of the following techniques would be most useful to identify and quantify the presence of a known impurity in a drug substance? A. NMR B. MS C. IR D. HPLC
Last Answer : IR
Description : HPLC is an abbreviation for? A. High Profit Liquid Chromatography B. High Pressure Liquid Chromatography C. Higher Performance Low Chromatography D. Higher Profit Low Chromatography
Last Answer : High Pressure Liquid Chromatography
Description : What is shielding in NMR? A. Using a curved piece of metal to block an opponent’s attack B. Putting metal around an Rf source C. When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei D. Blocking parts of a molecule from Rf radiation
Last Answer : When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei
Description : Chemical shifts (δ) are typically reported in units of A. Gauss (G) B. Millitesla per meter (mT/m) C. Parts per million (ppm) D. Percent (%)
Last Answer : Parts per million (ppm)
Description : Which of the following names refers to the highest energy spin state of an ¹H nucleus in a magnetic field? A. Spin-up B. Spin-down C. Parallel D. |+½>
Last Answer : Spin-down
Description : he dipole magnetic moment (μ) is directly proportional to nuclear spin (I), connected by a constant called the A. Gyromagnetic ratio (γ) B. Planck's constant (h) C. Nuclear susceptibility (χ) D. Chemical shift (δ)
Last Answer : Gyromagnetic ratio (γ)
Description : In mass spectrometry, fragmentation of ions is achieved through? A. Ionization B. Splitting C. Solubilization D. Coupling
Last Answer : Ionization
Description : The basis of the technique of chromatography for separating components of a mixture is? A. the differing movement of particles of different mass in an electrical field B. the interaction of the ... infrared radiation by the components. D. the deflection of charged particles in a magnetic field.
Last Answer : the interaction of the components with a stationary and a mobile phases
Description : In a chromatographic separation, which of the following is most appropriate for the qualitative identification of a substance? A. Relative retention factor B. Retention factor C. Retention time D. Resolution
Last Answer : Retention time
Description : Column efficiency is measured in terms of number of theoretical plates, which is: A. Inversely related to height equivalent to theoretical plates B. Directly related to the peak width C. Directly related to height equivalent to theoretical plates D. Inversely related to the peak width
Last Answer : Inversely related to height equivalent to theoretical plates
Description : Which one of the following is necessary for mass spectrometry to occur? A. Loss of an electron B. Change of alignment of a proton in a magnetic field C. A molecular vibration D. Excitation of an electron from the ground state to a higher energy state
Last Answer : Loss of an electron
Description : The base peak in mass spectrum is? A. The lowest mass peak B. The peak corresponding to the parent ion C. The highest mass peak D. The peak set to 100% relative intensity
Last Answer : The peak set to 100% relative intensity
Description : Signal splitting in NMR arises from? A. Shielding effect B. Spin-spin decoupling C. Spin-spin coupling D. Deshielding effecr
Last Answer : Spin-spin coupling
Description : 1H nuclei located near electronegative atoms tend to be ______ relative to 1H nuclei A. Shielded B. Deshielded C. Resonanced D. Split
Last Answer : Deshielded
Description : Which of the following is used as a carrier gas in gas chromatography A. Carbon dioxide B. Oxygen C. Helium D. Methane
Last Answer : Helium
Description : What is a chromophore? A. A coloured compound B. A group of atoms in compound responsible for electromagnetic radiation C. A group of atoms in a compound responsible for the absorption of electromagnetic radiation D. A group of atoms in coloured compound
Last Answer : A group of atoms in a compound responsible for the absorption of electromagnetic radiation
Description : Infrared spectroscopy provides valuable information about A. Molecular weight B. Melting point C. Conjugation D. Functional groups
Last Answer : Functional groups
Description : To improve a chromatographic separation, you must A. Increase the number of theoretical plates on the column. B. Increase the height of the theoretical plates on the column. C. Increase both the number ... the column. D. Decrease both the number and the height of the theoretical plates on the column
Last Answer : Increase the number of theoretical plates on the column
Description : The fluid exiting a chromatographic column is called the A. eluent B. eluate C. analyte D. elution
Last Answer : eluate
Description : Mobile phase can be A. gas or liquid B. solid or liquid C. only solid D. gas only
Last Answer : gas or liquid
Description : Chromatography can be used to A. form mixtures B. change mixture compositions C. separate mixtures into pure substances D. all of these
Last Answer : separate mixtures into pure substances
Description : In organic molecules, fluorescence seldom results from absorption of UV radiation of wavelengths lower than (A) 350 nm (B) 200 nm (C) 300 nm (D) 250 nm
Last Answer : (A) 350 nm
Description : The calibration of an HPLC detector can be evaluated by measurement of? A. Retention time B. Temperature C. Flow rate accuracy D. Intensity of the peak
Last Answer : D. Intensity of the peak
Description : Pick out the extensive property out of the following. (A) Surface tension (B) Free energy (C) Specific heat (D) Refractive index
Last Answer : (B) Free energy
Description : Describe Refractive Index property of solution. Explain its dependence on composition and temperature.
Last Answer : Refractive index: Refractive index of a medium is defines as the ratio of speed of light in vacuum to the speed of light in the medium. Refractive index = (speed of light in vacuum/ speed of ... decreases as the solution is denser and as a result of this refractive index of the solution decreases.
Description : What is the principle of UV-Visible spectrum ?
Last Answer : Molecules that have pie electrons or bondless electrons absorb energy from these electronic ultraviolet and visible light rays of the molecular orbitals and are transmitted for short periods of ... molecular orbitals in excited state. This results in UV-Visible or Electronic Absorption Spectrum.
Description : Which one of the following is used for determining the structure of crystal - (1) Gamma rays (2) X-rays (3) UV rays (4) visible light
Last Answer : (2) X-rays Explanation: Crystallography is the science that examines crystals which can be found everywhere in nature, from salt to snowflakes to gemstones.
Description : The radiant energy having lowest energy is – (1) gamma rays (2) UV rays (3) visible light (4) microwave radiation
Last Answer : (4) microwave radiation Explanation: The parts of the electromagnetic spectrum, arranged from highest energy to lowest, are gamma rays, Xrays, Ultraviolet light, visible light, infrared light, microwaves, and radio waves.
Description : Name the spectral series which appear in the region of electromagnetic spectrum. (a) Visible region (b) UV region (c) Far IR region
Last Answer : Ans: (a) Balmer Series (b) Lymen Series (c) Pfund Series
Description : UV light falls in the category of------? A. Ionizing Radiations (Answer) B. Non Ionizing Radiation C. Visible light D. None
Last Answer : A. Ionizing Radiations (Answer)
Description : The radiant energy having lowest energy is (1) gamma rays (2) UV rays (3) visible light (4) microwave radiation
Last Answer : microwave radiation
Description : With a gas turbine engine, engine anti-icing should be selected ‘ON’: a. Whenever the igniters are on b. Whenever the IOAT is +10°C or below and the air contains visible moisture c. Whenever the TOAT is +10°C or below and it is raining d. Whenever the ice detector system warning light comes on
Last Answer : b. Whenever the IOAT is +10°C or below and the air contains visible moisture
Description : With a gas turbine engine, engine anti-icing should be selected ON': a. Whenever the igniters are on b. Whenever the IOAT is +10°C or below and the air contains visible moisture c. Whenever ... is +10°C or below and it is raining d. Whenever the ice detector system warning light comes on
Description : What is the relationship between the UV index and latitude?
Last Answer : Feel Free to Answer
Description : 6. “The refractive index of diamond is 2.42”. What is the meaning of this statement in relation to speed of light? [Delhi] -Chemistry-10
Last Answer : Answer. hope this helps you
Description : 5. The refractive index of diamond is 2.42. What is the meaning of this statement? -Physics-10
Last Answer : Diamond has a refractive index of 2.42 which means that the speed of light in diamond will reduce by a factor of 2.42 as compared to its speed in the air. In other words, the speed of light in diamond is 1/2.42 times the speed of light in vacuum.
Description : 2. Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 x 108 ms-1. -Physics-10
Last Answer : Refractive index of a medium (nm) = Speed of light in vacuum/Speed of light in the medium Speed of light in vacuum (c) = 3 × 108 m/s Refractive index of glass (ng) = 1.50 Speed of light in the ... Speed of light in vacuum/ Refractive index of glass = c/ng =3 × 108/1.50 = 2x 108 ms-1.
Description : “The refractive index of diamond is 2.42”. What is the meaning of this statement in relation to speed of light? -Physics
Last Answer : I hope it helped you
Description : The refractive index of a given piece of transparent quartz is greatest for which light? -Do You Know?
Last Answer : answer:
Description : The refractive index of a piece of transparent quartz is the greatest for which light? -Do You Know?
Description : What is Refractive Index ? -Physics
Last Answer : Refractive index is a measure of how much speed of light changes when it enter the medium from air.
Description : What is the refractive index of sound 1.44?
Last Answer : The refractive index of sound through kerosene oil is 1.44 .
Description : What is the refractive index of sound 1.6?
Last Answer : The refractive index of sound through mica is 1.6 .
Description : What is the refractive index of sound 1.456?
Last Answer : The refractive index of sound through alum is 1.456 .
Description : What is the refractive index of sound 2.63?
Last Answer : The refractive index of sound through glass is 2.63 .
Description : What is the refractive index of sound 2.42?
Last Answer : The refractive index of sound through diamond is 2.42 .
Description : What is the refractive index of sound 1.33?
Last Answer : The refractive index of sound through water is 1.33 .
Description : What is the refractive index of sound 1.30?
Last Answer : The refractive index of sound through ice is 1.30 .