R4RIN – MCQs, Mock Tests | Analytical instruments Analytical Instrumentation MCQ Question Set 9

The first gamma camera is also known by which of the following names?

1. Hal camera
2. Anger camera
3. Muller camera
4. West camera

✅ Correct Answer: 2

Which of the following is not a component of gamma camera?

1. Collimator
2. Detector crystal
3. Pre-amplifier
4. Position logic circuit

✅ Correct Answer: 3

Which of the following is the first object that an emitted gamma photon encounters after exciting the body?

1. Collimator
2. Detector crystal
3. Photo multiplier tubes
4. Position logic circuit

✅ Correct Answer: 3

Which of the following is a pattern of holes through gamma ray absorbing material, usually lead or tungsten?

1. Collimator
2. Detector crystal
3. Photo multiplier tubes
4. Position circuitry

✅ Correct Answer: 1

When the energy of an absorbed gamma photon is released, a flash of light is produced. This is similar to which of the following effects?

1. Photoelectric effect
2. Compton effect
3. Pair production
4. Collision effect

✅ Correct Answer: 1

Which of the following components adds all the signals and determines where each scintillation event occurred in the detector?

1. Collimator
2. Detector crystal
3. Photo multiplier tubes
4. Position circuitry

✅ Correct Answer: 4

Gamma camera uses one scintillation detector.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 2

Gamma camera uses which of these components to produce a position intensity picture of a radioactive area?

1. Collimator
2. Scintillation detector
3. Photo multiplier tubes
4. Position circuitry

✅ Correct Answer: 2

Which of the following is known as a scintillation counter?

1. Scintillator
2. Scintillator along with a photo multiplier tube
3. Scintillator along with the crystal
4. Scintillator along with position circuitry

✅ Correct Answer: 2

Straight bore collimator is used for thyroid work in the medical field.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 2

In liquid scintillation counter, which of the following is a fluorescent substance?

1. Solvent
2. Solute
3. Crystal
4. Reagent

✅ Correct Answer: 2

When UV light is absorbed by the fluor molecules the light emitted is in which of the following colours?

1. Pink
2. Red
3. Green
4. Blue

✅ Correct Answer: 4

In liquid scintillation counter, which of the following is used to convert light into electrical signals?

1. Photo multiplier tube
2. Photo emissive tube
3. Photo voltaic cell
4. Photo reflector

✅ Correct Answer: 1

The reduction in counting efficiency of the scintillation detector is called as ______

1. Disintegration
2. Decay
3. Quenching
4. Reduction

✅ Correct Answer: 3

Which of the following is not a type of quenching?

1. Chemical quench
2. Interference quench
3. Colour quenching
4. Self-absorption

✅ Correct Answer: 2

In which type of quenching, the radiation emitted by the isotope is not detected due to absorption of the radiation by the sample itself?

1. Chemical quench
2. Interference quench
3. Colour quenching
4. Self-absorption

✅ Correct Answer: 4

Variation of gain with temperature does not cause instability.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 2

Due to the presence of red, green and yellow colour in the vial, which of the following occurs?

1. Chemical quench
2. Interference quench
3. Colour quenching
4. Self-absorption

✅ Correct Answer: 3

A quench curve can be constructed by plotting the counting efficiency versus _________

1. Q-number
2. Quench factor
3. H-number
4. Disintegrations

✅ Correct Answer: 3

Photomultipliers used in Liquid scintillation detectors are a source of instability.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 2

A discriminator circuit is which of the following circuits?

1. Wheatstone bridge
2. Instrumentation amplifier
3. Astable multivibrator
4. Schmitt trigger

✅ Correct Answer: 4

Which of the following is the function of the discriminator?

1. Rejects signals below a certain voltage
2. Rejects signals above a certain voltage
3. Rejects signal in a range alone
4. Filters noise alone

✅ Correct Answer: 1

The difference between the pulses having amplitudes between the two triggering levels is called ______

1. Pulse width
2. Energy gap
3. Window width
4. Amplitude variation

✅ Correct Answer: 3

The pulses having amplitudes between the two triggering levels are given by which of the following components?

1. Pre-amplifiers
2. Linear amplifiers
3. Anti-coincidence circuits
4. Discriminators

✅ Correct Answer: 4

Schmitt triggers are followed by which of the following components?

1. Pre-amplifier
2. Linear amplifier
3. Anti-coincidence circuit
4. Discriminators

✅ Correct Answer: 3

Which of the following components cancels all the pulses which trigger both the discriminators?

1. Pre-amplifier
2. Linear amplifier
3. Anti-coincidence circuit
4. Discriminator

✅ Correct Answer: 3

Which of the following is used when the number of channels is ten or less?

1. Two discriminators in series
2. Two discriminators in parallel
3. Series array of discriminators
4. Parallel array of discriminators

✅ Correct Answer: 4

If number of channels is more than ten, the problems of stability of discrimination voltages arise.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

The signal reaching which of the following components is the one lying in the window of pulse height analyser?

1. Pre-amplifier
2. Linear amplifier
3. Counter
4. Discriminators

✅ Correct Answer: 3

The measurement of pulse height is useful for energy determination.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

In X-ray spectrometers, the specimen or the sample is placed after which of the following components?

1. X-ray tube
2. Monochromator
3. Collimator
4. Detector

✅ Correct Answer: 1

Which of the following components are used to generate X-rays?

1. Meyer tube
2. West tube
3. Anger tube
4. Coolidge tube

✅ Correct Answer: 4

Using which of the following components is the generated x-rays focussed upon the specimen?

1. X-ray tube
2. Monochromator
3. Collimator
4. Detector

✅ Correct Answer: 3

The cathode in the Coolidge tube is made of which of the following elements?

1. Quartz
2. Iron
3. Tungsten
4. Barium

✅ Correct Answer: 3

The cathode in the Coolidge tube is kept in an inclined manner.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

Which of the following is not a target metal used in the Coolidge tube?

1. Rhodium
2. Cobalt
3. Gold
4. Silver carbide

✅ Correct Answer: 3

How can the resolution of the collimator be increased?

1. By reducing the separation between the metal plates of the collimator
2. By increasing the separation between the metal plates of the collimator
3. By increasing the number of metal plates
4. By decreasing the number of metal plates

✅ Correct Answer: 1

When x-rays emitted from molybdenum are allowed to pass through a zirconium filter, which of the following occurs?

1. It absorbs radiation of shorter wavelength
2. It absorbs radiation of longer wavelength
3. It allows radiation of shorter wavelength to pass through
4. It allows radiation in a particular band to pass through

✅ Correct Answer: 2

When compared to filters, monochromators provide much signal to noise ratio.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

Which of the following crystals are not suited for x-ray grating?

1. Topaz
2. Lithium fluoride
3. Calcium fluoride
4. Sodium fluoride

✅ Correct Answer: 4

The x-rays generated come out of the Coolidge tube through which of the following?

1. Beryllium window
2. Tungsten window
3. Collimator
4. Target material

✅ Correct Answer: 1

X-ray diffractometers are not used to identify the physical properties of which of the following?

1. Metals
2. Liquids
3. Polymeric materials
4. Solids

✅ Correct Answer: 2

X-ray diffractometers provide ____________ information about the compounds present in a solid sample.

1. Quantitative
2. Qualitative
3. Quantitative and qualitative
4. Either quantitative or qualitative

✅ Correct Answer: 3

Using the powder method of diffractometers, which of the following can be determined?

1. Percentage of K+
2. Percentage of Na+ and Cl-
3. Percentage of KBr and NaCl
4. Percentage of Br-

✅ Correct Answer: 3

In powder method, the powder sample is contained in which of the following?

1. Thin walled glass capillary tubes
2. Thin walled test tube
3. Thin walled curvettes
4. Thin walled flask

✅ Correct Answer: 1

Which of the following is the most common instrument for photographic recording of diffraction patterns?

1. Debye-Scherrer powder camera
2. Gamma camera
3. Geiger tube
4. Scintillation counter

✅ Correct Answer: 1

With the help of which of the following equations is the distance calculated from a known wavelength of the source and measured angle?

1. Coolidge equation
2. Bragg’s equation
3. Debye equation
4. Scherrer equation

✅ Correct Answer: 2

In Diffractometer, the identification of a component of the sample from its powder diffraction pattern is based upon the _________ of lines and their relative _______

1. Number, length
2. Number, intensity
3. Position, length
4. Position, intensity

✅ Correct Answer: 4

When certain geometric requirements are met, X-rays scattered from a crystalline solid can constructively interfere with each other and produce a diffracted beam.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

Diffractometers are similar to which of the following?

1. Optical grating spectrometer
2. Prism spectrometer
3. Photo multiplier
4. Photovoltaic cell as detector

✅ Correct Answer: 1