Nuclear Power Engineering

A. α-particle emission from a radioactive element makes it electrically negative
B. β-particle emission from a radioactive element makes it electrically positive
C. A radioactive element having a half life period of 20 years will completely disintegrated in 40 years
D. The disintegration constant of a radioactive isotope is independent of pressure, temperature or concentration

A. Atoms with same number of nucleons but different number of protons are called isobars
B. Atoms with same number of protons but different number of nucleons are called isoters
C. Out of α, β, and γ-rays, the one having maximum penetration power are γ-rays
D. The product formed by emission of α-particle has mass number less by 4 units than the parent nuclide

A. The nucleus of a hydrogen atom is identical with a proton
B. A, β-ray particle is identical with an electron
C. Mass of an electron is about 1/1800th of the lightest nucleus
D. Positron is heavier than a proton

A. The ratio of the density of the ‘nucleus’ to that of the ‘atom’ is 1012
B. α-particle is identical with a doubly charged helium ion
C. The mass of deuterium atom is half that of helium atom
D. Gamma rays are high energy electrons

A. Positron is the antiparticle of electron
B. In α-decay, the ratio of neutron to proton decreases
C. Ionising power of β-rays is higher than that of α-rays
D. Speed of α-rays is more than that of γ-rays

A. Loss of electrons from neutral atoms produces negative ions
B. The radius of nucleus & atomic size are of the order of 10-12 cm & 10-8 cm respectively
C. Gain of electrons by neutral atoms form cations
D. Proton to neutron ratio in a stable nucleus is 2 : 1

A. The disintegration rate of a radioactive substance cannot be increased by heating it
B. Electrons have negligible mass and unit negative change
C. Deuterium atom has one proton and two neutrons in its nucleus
D. Cadmium is capable of absorbing neutrons

A. Deuterium
B. Ortho-hydrogen
C. Tritium
D. None of these

A. Natural uranium fuelled heavy water cooled & moderated
B. Highly enriched uranium (85% U-235) fuelled
C. Homogeneous
D. Fast breeder

A. Pressurised water reactor (PWR)
B. Boiling water reactor (BWR)
C. Candu reactor
D. Molten sodium cooled reactor