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2031
Radioactivity is the phenomenon associated with the
A. transition of radiowaves
B. nuclear reaction
C. decay of nucleus
D. production of α-particles only
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Correct Option
Explanation
Radioactivity refers to spontaneous decay processes of unstable nuclei.
2032
Both positive and negative mu mesons decay into:
A. Electrons only
B. Neutrino-antineutrino pairs only
C. Electrons and neutrino-antineutrino pairs
D. None of these
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Correct Option
Explanation
Muon (mu) decay proceeds via the weak interaction producing an electron plus a neutrino and an antineutrino.
2033
Zirconia is classified as:
A. Ceramic solid
B. Ionic Compound
C. Metal
D. Either (A) or (B)
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Explanation
Zirconia (zirconium dioxide) is a ceramic material commonly classified as a ceramic solid.
2034
Cobalt 60 is used in medicine and is an intense source of:
A. Neutrons
B. γ-rays
C. ß-particles
D. a-particles
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Correct Option
Explanation
Cobalt-60 is a strong source of gamma (γ) rays used in radiotherapy.
2035
The ionisation potential of hydrogen atom is
A. 10.36 volt
B. 14.24 volt
C. 13.60 volt
D. 8.24 volt
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Explanation
The well-known ionisation energy for hydrogen from the ground state is 13.6 electron volts (13.60 V).
2036
The relationship between mass number, atomic number and neutron number is
A. A = Z - N
B. N = Z - A
C. A = Z + N
D. Z = A + N
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Correct Option
Explanation
Mass number A is the sum of atomic number Z and neutron number N: A = Z + N.
2037
____ therapy machines were the initial cancer treatment device.
A. Cobalt-70
B. Cobalt-50
C. Cobalt-40
D. Cobalt-60
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Correct Option
Explanation
Historically, cobalt-60 teletherapy units were widely used as early external-beam radiotherapy devices for cancer treatment.
2038
Assuming that internucleon potential in deuteron to be of rectangular well type with depth V0 and range r0. If En is the binding energy of deuteron, the radius of deuteron is given by
A. rg = F0 V!“ (TE)
B. +4 = 10V!"2 VR(Eg)
C. EA == m2, E2 == mc2
D. +2 = 10 Vì 2 T(En)
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Correct Option
Explanation
OCR answer key in the block indicates option C is the correct expression for the deuteron radius in the rectangular-well approximation.
2039
An atom of a constituent varies from an atom of one of its ______ in the number of neutrons in nucleus.
A. Isotopes
B. Protons
C. Electrons
D. None of these
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Explanation
Isotopes are atoms of the same element that differ in neutron number while having the same proton number.
2040
121. De Broglie equation treats an electron as
A. both wave and particle
B. a wave
C. a particle
D. none
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Correct Option
Explanation
De Broglie associated a wavelength with particles, treating electrons as having both wave and particle properties, so option C is correct.
