MCQ on Cyclotron
Q1: The angular frequency of a cyclotron is independent of
a) Mass
b) Magnetic field
c) Charge
Answer: (a) Speed
Q2: The maximum kinetic energy of the positive ion in the cyclotron is
a) qBR2/2m
b) q2B2R2/2m
c) q2B2R2/m
d) qBR/m
Answer: (b) q2B2R2/2m
Q3: Cyclotron cannot accelerate
a) Electrons
b) Neutrons
c) Positive ions
d) (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
a) 28 MHz
b) 280 MHz
c) 2.8 GHz
d) 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?
a)16.6 MeV
b)12 MeV
c)15 MeV
d)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
a)B = mf/e and K= 2mπ2v2R2
b)B =2πmf/e and K= m2πvR2
c)B =2πmf/e and K= 2mπ2v2R
d)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).
a)0.961 x 10-11 J
b)1.22 x 10-11 J
c)1.5 x 10-12 J
d)12 x 10-11 J
Answer: (a) 0.961 x 10-11 J
Q8: Cyclotron can be used in
a)Particle therapy to treat cancer
b)Source of high energy beam for a nuclear physics experiment
c)Produce short-lived positron-emitting isotopes for PET imaging
d)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
a)2.80 x 106
b)9.6 x 103
c)5.6 x 106
d)1.76 x 106
Answer: (b) 9.6 x 103
Q10: A cyclotron can accelerate
a)β particles
b)α particles
c)High-velocity gamma rays
d)High-velocity X-rays
Answer: (b) α particles
