Biological Tools And Techniques — Part 1 MCQs with Explanations

The correct answer is B: Flame photometry * Flame photometry is a technique specifically designed to measure the concentration of certain elements, like sodium (Na) and potassium (K) , based on their emission of light when introduced into a flame. * Here's why the other options are less suitable: * UV-Visible spectrophotometry: This technique measures how much UV or visible light a substance absorbs. It's good for identifying and quantifying organic molecules, but not ideal for directly measuring sodium or potassium in a complex matrix like rock or soil. * HPLC (High-Performance Liquid Chromatography): This is a separation technique. It separates different components in a liquid mixture. While it can be coupled with detectors that could measure sodium and potassium , it's not the primary or most efficient method for just measuring those elements. * Colorimetry: This method measures the absorbance of light by a colored solution to determine the concentration of a substance. While some reactions can be developed that produce colored compounds from sodium or potassium, it's generally more complex and less accurate than flame photometry for direct measurement of these elements. So, because Flame photometry directly measures the light emitted by sodium and potassium when heated in a flame, it's the most appropriate technique for estimating their concentration in rock and soil samples.

70% is the correct answer to “Which concentration of ethanol (ethyl alcohol) is the most effective as a disinfectant”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Heat is the correct answer to “Which of the following method works primarily by denaturing proteins”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

GC - MS is the correct answer to “Dioxins and furans are two toxic gaseous pollutants which can be measured by”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Air is the correct answer to “HEPA filters are used to filter”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Shorter the wavelength, Higher the resolving power is the correct answer to “What is the relationship between resolving power of a microscope and wavelength”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Gas chromatography is the correct answer to “Which of the following techniques is most suitable for the estimation of organic or their residues”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

HPLC is the correct answer to “In which type of chromatography four modes viz., absorption, partition, ion exchange and exclusion, are present”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

MPN is the correct answer to “Which of the following is not a molecular method for detection of microbial population from waterl soil”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Fluorescent microscope is the correct answer to “An ultraviolet light source is used in”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

All the above is the correct answer to “Element contaminating the water body is determined and quantified by using one of the following methods”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Dry weight determination is the correct answer to “Which of the following technique does not give a viable count”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

260 nm is the correct answer to “The most effective germicidal wavelength of UV is”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Transmission electron microscopy is the correct answer to “Which one of the following is used to study the structural details of biological tissues using freezefracture technique”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

XRD is the correct answer to “Which of the following instruments is based on Bragg's law”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Drag versus gravitational force is the correct answer to “Sedimentation efficiency depends on the relative strength of”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

121°C is the correct answer to “The typical temperature for autoclaving (operating at 15 pounds per square inch of pressure) is”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

X - ray diffraction is the correct answer to “To understand the 3D structure of the molecule following technique is called”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Fluorescence is the correct answer to “When certain types of molecules absorb UV energy, energy in the UV or visible regions is emitted as the excess energy. This phenomenon is known as”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

0.2 - 0.29 μm is the correct answer to “The band labelled as UV - C which is lethal to microorganisms is”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

UV light is the correct answer to “Which of the following is not a chemical agent causing mutation”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Atomic absorption spectrophotometer is the correct answer to “Which of the following instrument is most suitable to estimate heavy metals from the effluent”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

MALDI-TOF is the correct answer to “One of the following platforms is used for whole cell fingerprinting”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Diffraction is the correct answer to “Which of these required quantum nature of light for their explanation”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Potentiometry is the correct answer to “CO can be suitably determined by”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Atomic absorption spectrophotometer is the correct answer to “Which one of the following techniques can be used for determining the level of cadmium in soil”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Flame photometry is the correct answer to “Sodium is usually estimated by which of the following analytical technique”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

The degree of absorption of monochromatic light by a homogenous medium is the correct answer to “Beer - Lambert's law defines”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

X - ray crystallography is the correct answer to “Which one of the following is the best tool to study the interacting residues in protein - ligand interaction”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Atomic absorption spectrophotometer is the correct answer to “Hollow cathode lamp is used in”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Molecular exclusion chromatography is the correct answer to “Which is used to separate molecules on the basis of their sizes”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Membrane filtration is the correct answer to “The heat sensitive components of microbial medium are sterilized by”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Conductivity bridge is the correct answer to “The instrument used for determination of transparency of water is”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Emission is the correct answer to “Remote sensing of ocean-atmospheric parameters carried out in the microwave channels is based on the phenomenon of”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Atomic absorption spectrophotometer is the correct answer to “If one wishes to measure total As, As +3 and As +5 in a sample the most suitable analytical tool is”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Excessive flux of visible radiations is the correct answer to “Snow blindness is caused due to”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Fluorescence spectroscopy is the correct answer to “Which of the following experimental methods is not used to determine three-dimensional structures of biological macromolecules”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

LIDAR is the correct answer to “Which of the following instrument cap map the concentration of SO 2 over an area of land”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Autoclaving is the correct answer to “Which of the following treatment achieves sterilization”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.

Autoclave at 121°C is the correct answer to “Which of the following would be the fastest way to kill endospores”. This question is standard in competitive examination syllabi for Biological Tools And Techniques.