MCQs on Cyclotron

MCQs on Cyclotron

Q1: The angular frequency of a cyclotron is independent of

1. Speed
2. Mass
3. Magnetic field
4. Charge

Answer: (a) Speed

Q2: The maximum kinetic energy of the positive ion in the cyclotron is

1. qBR²/2m
2. q²B²R²/2m
3. q²B²R²/m
4. qBR/m

Answer: (b) q²B²R²/2m

Q3: Cyclotron cannot accelerate

1. Electrons
2. Neutrons
3. Positive ions
4. (Both (1) and (2)

Answer: (d) Both (1) and (2)

Q4: The cyclotron frequency of an electron grating in a magnetic field of 1 T is approximately

1. 28 MHz
2. 280 MHz
3. 2.8 GHz
4. 28 GHz

Answer: (d) 28 GHz

Q5: Suppose a cyclotron is operated at an oscillator frequency of 12 MHz and a dee radius of 53cm. What is the resulting kinetic energy of the deuterons?

1. 16.6 MeV
2. 12 MeV
3. 15 MeV
4. 14 MeV

Answer: (a) 16.6 MeV

Q6: An alternating electric field of frequency f is applied across the dees (radius = R) of a cyclotron that is being used to accelerate protons (mass = m). The operating magnetic field (B) used in the cyclotron and the kinetic energy (K) of the proton, produced by it, are given by

1. B = mf/e and K= 2mπ²v²R²
2. B =2πmf/e and K= m²πvR²
3. B =2πmf/e and K= 2mπ²v²R
4. B = mf/e and K= m²πvR²

Answer: (c) B =2πmf/e and K= 2mπ²v²R

Q7: The energy of emergent protons in MeV from a cyclotron having a radius of its dees 2 m and applied magnetic field 0.8 T is (mass of proton = 1.67 x 10^-27 kg).

1. 0.961 x 10^-11 J
2. 1.22 x 10^-11 J
3. 1.5 x 10^-12 J
4. 12 x 10^-11 J

Answer: (a) 0.961 x 10^-11 J

Q8: Cyclotron can be used in

1. Particle therapy to treat cancer
2. Source of high energy beam for a nuclear physics experiment
3. Produce short-lived positron-emitting isotopes for PET imaging
4. All the above

Answer: (d) All the above

Q9: A proton of energy 100 eV is moving perpendicular to a magnetic field 10-4 T. The cyclotron frequency of the proton in radian/sec

1. 2.80 x 10⁶
2. 9.6 x 10³
3. 5.6 x 10⁶
4. 1.76 x 10⁶

Answer: (b) 9.6 x 10³

Q10: A cyclotron can accelerate

1. β particles
2. α particles
3. High-velocity gamma rays
4. High-velocity X-rays

Answer: (b) α particles