R4RIN – MCQs, Mock Tests | Analytical instruments Analytical Instrumentation MCQ Question Set 14

It is advantageous to use ions from a variety of gases.

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

✅ Correct Answer: 1

Which of the following gases is not often used in ion spectroscopy?

1. Helium
2. Argon
3. Nitrogen
4. Neon

✅ Correct Answer: 3

ISS is sensitive to every element heavier than which of the following?

1. Helium
2. Hydrogen
3. Nitrogen
4. Neon

✅ Correct Answer: 1

Which of the following is the lightest isotope used as a primary ion?

1. He
2. 2He
3. 3He
4. 3H

✅ Correct Answer: 3

The specificity will vary depending on the scattering gas used.

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

✅ Correct Answer: 1

ISS is less sensitive than which of the following?

1. SIMS
2. Auger
3. ESCA
4. AES

✅ Correct Answer: 1

Which of the following is the detection limit of ISS for monolayer?

1. 10 -1 %
2. 10 -2 %
3. 10 -3 %
4. 10 -4 %

✅ Correct Answer: 3

After passing through the pre-filter, ions are passed through which of the following?

1. Quadrupole mass spectrometer
2. Time of flight mass spectrometer
3. Radiofrequency mass spectrometer
4. Magnetic deflection mass spectrometer

✅ Correct Answer: 1

Which of the following is the range of quadrupole mass spectrometer used in SIMS?

1. 100-200 amu
2. 200-300 amu
3. 500-1000 amu
4. 200-500 amu

✅ Correct Answer: 3

Which of the following is the resolution of quadrupole mass spectrometer used in SIMS?

1. 1 amu
2. 2 amu
3. 5 amu
4. 3 amu

✅ Correct Answer: 1

Electron spin resonance involves detecting the detection of a physical phenomenon of _________ of electromagnetic radiation.

1. Adsorption
2. Absorption
3. Radiation
4. Reflection

✅ Correct Answer: 1

Electron spin resonance is also known as which of the following?

1. Electron paramagnetic resonance
2. Electron diamagnetic resonance
3. Electron paramagnetic reoccurrence
4. Electron diamagnetic reoccurrence

✅ Correct Answer: 1

The value of the magnetic moment is known as which of the following?

1. Thompson magneton
2. Bohr magneton
3. Goldstein magneton
4. Rutherford magneton

✅ Correct Answer: 2

When a strong magnetic field is applied to the unpaired spins of an electron, the electrons will be split into two groups.

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

✅ Correct Answer: 1

When the electrons are aligned either parallel or antiparallel to the direction of the external magnetic field, the electrons will precess about the axis at a frequency that is proportional to which of the following?

1. Applied magnetic field
2. Electron magnetic moment
3. Applied magnetic field and electron magnetic moment
4. Neither applied magnetic field not electron magnetic moment

✅ Correct Answer: 3

If a weaker radiofrequency alternating magnetic field, having the frequency of precession of the electron is applied at right angles to fixed magnetic field, which of the following occurs?

1. Fragmentation
2. Scattering
3. Resonance
4. Absorption

✅ Correct Answer: 3

If the population of ground state exceeds the population of the excited state a net absorption of __________ radiation takes place.

1. Infrared
2. Ultraviolet
3. Microwave
4. X-ray

✅ Correct Answer: 3

The population ratio can be given by which of the following laws?

1. Bohr law
2. Beer-Lambert law
3. Kelvin law
4. Boltzmann law

✅ Correct Answer: 4

The sensitivity of measurement is greatly enhanced by using which of the following?

1. High magnetic field
2. Low magnetic field
3. High electric field
4. Low electric field

✅ Correct Answer: 1

ESR sensitivity increases with __________ temperature and with _________ magnetic field strength.

1. Increasing, increasing
2. Increasing, decreasing
3. Decreasing, increasing
4. Decreasing, decreasing

✅ Correct Answer: 3

ESR is remarkably sensitive when compared with NMR.

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

✅ Correct Answer: 1

Reflex klystron is used in which of the following frequency ranges?

1. 1000 to 2000 MHz
2. 1000 to 10000 MHz
3. 1000 to 15000 MHz
4. 1000 to 20000 MHz

✅ Correct Answer: 4

Under ideal conditions, a commercial X-band spectrometer can detect of the order of which of the following number of spins at room temperature?

1. 101
2. 105
3. 1010
4. 1012

✅ Correct Answer: 4

Waveguides look like _________ cross-section pipes with dimensions of the order of the wavelength to be transmitted.

1. Triangular
2. Circular
3. Rectangular
4. Square

✅ Correct Answer: 3

Klystron can generate power in which of the following ranges?

1. 10 – 100 mW
2. 10 – 200 mW
3. 10 – 500 mW
4. 100 – 400 mW

✅ Correct Answer: 3

Microwave frequency can be tuned over a small range by adjusting the distance between which of the following?

1. Cathode and anode
2. Anode and the reflector
3. Cathode and the reflector
4. Cathode and grid

✅ Correct Answer: 3

Microwaves are generated by __________ and the power level is adjusted with the ____

1. Triode, rectifier
2. Pentode, attenuator
3. Klystron tube, attenuator
4. Diode, rectifier

✅ Correct Answer: 3

Which of the following is also known as reflex oscillator?

1. Triode
2. Pentode
3. Special tube
4. Klystron tube

✅ Correct Answer: 4

Microwaves reflected back from the cavity are routed to which of the following?

1. Attenuator
2. Klystron
3. Load
4. Diode detector

✅ Correct Answer: 4

Which of the following routes are the microwaves entering from the klystron towards the cavity?

1. Oscillator
2. Attenuator
3. Circulator
4. Reflector

✅ Correct Answer: 3

By introducing which of the following, signal-to-noise ratio can be improved?

1. Small amplitude field modulation
2. Large amplitude field modulation
3. Small amplitude field attenuation
4. Large amplitude field attenuation

✅ Correct Answer: 1

Which of the following is adjusted as a fine control for frequency tuning?

1. Cathode
2. Anode
3. Reflector voltage
4. GridFS

✅ Correct Answer: 3

In basic ESR spectrometer, the cavity length is adjustable.

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

✅ Correct Answer: 2

The cavity resonant frequency should be equal to which of the following?

1. Frequency of electric field
2. Klystron frequency
3. Frequency of magnetic field
4. Mechanical frequency

✅ Correct Answer: 2

When klystron frequency is close to the cavity resonant frequency, much less power is reflected from the cavity to the diode.

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

✅ Correct Answer: 1

From which of the following are electrons emitted in the klystron tube?

1. Cathode
2. Anode
3. Grid
4. Reflector electrode

✅ Correct Answer: 1

Which of the following is the operating frequency of the ESR spectrometer?

1. 1.7 to 3.4 GHz
2. 1.5 to 4.2 GHz
3. 3.2 to 5.4 GHz
4. 8.8 to 9.6 GHz

✅ Correct Answer: 4

At which of the following frequencies is the magnetic field at the sample modulated?

1. 1 kHz
2. 10 kHz
3. 100 kHz
4. 1000 kHz

✅ Correct Answer: 3

The output of the klystron does not pass through which of the following?

1. Isolator
2. Reflector
3. Power leveller
4. Directional coupler

✅ Correct Answer: 2

Which of the following is used as detector crystal in ESR spectrometer?

1. Silicon rectifier
2. Silicon tungsten rectifier
3. Silicon boron rectifier
4. Silicon quartz rectifier

✅ Correct Answer: 2

After detection, the resulting signal will have which of the following frequencies?

1. 1 kHz
2. 10 kHz
3. 100 kHz
4. 1000 kHz

✅ Correct Answer: 3

Which of the following is the modulation amplitude range of ESR spectrometer?

1. 1mG to 10G
2. 2mG to 15G
3. 3mG to 20G
4. 5mG to 40G

✅ Correct Answer: 4

In which of the following ranges will the receiver time constant of the ESR spectrometer lie?

1. 0 to 10 s
2. 0.3 to 1 s
3. 0.03 to 10 s
4. 0.003 to 100 s

✅ Correct Answer: 4

Which of the following is the oscilloscope field width of the ESR spectrometer?

1. 0.2 to 40 G
2. 0.1 to 20 G
3. 0 to 10 G
4. 0.01 to 20 G

✅ Correct Answer: 1

The magnet used in ESR spectrometer provides a magnetic field which can be varied from ________ to _______

1. 20 mgauss, 100mgauss
2. 200 mgauss, 20kgauss
3. 20 mgauss, 20kgauss
4. 100 mgauss, 10kgauss

✅ Correct Answer: 2

Which of the following sensor is used in ESR spectrometer?

1. Hall-effect sensor
2. Load cell
3. Strain gauge
4. Bourdon gauge

✅ Correct Answer: 1

Which of the following oscillator is used as 1230 Hz oscillator?

1. Hartley oscillator
2. Crystal oscillator
3. RC oscillator
4. Wien bridge oscillator

✅ Correct Answer: 4

What does AFC stand for?

1. Auto frequency correct
2. Automated frequency correct
3. Automatic frequency control
4. Automatic frequency circuit

✅ Correct Answer: 3

Klystron requires _______ for the klystron beam and up to _____ for the klystron reflector.

1. +400 V, -730 V
2. +650 V, -400 V
3. +200 V,-530 V
4. +180 V,-270 V

✅ Correct Answer: 2

The klystron body is insulated from ground by an insulating gas casket.

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

✅ Correct Answer: 1