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

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Q. 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?

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Q. 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?

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

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

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

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

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Q. ESR is remarkably sensitive when compared with NMR.

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

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

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

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Q. Klystron can generate power in which of the following ranges?

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

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Q. Microwaves are generated by __________ and the power level is adjusted with the ________

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Q. Which of the following is also known as reflex oscillator?

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

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

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

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

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Q. In basic ESR spectrometer, the cavity length is adjustable.

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