A. Deuterium
B. Ortho-hydrogen
C. Tritium
D. None of these
Related Mcqs:
- A radioactive isotope undergoes decay with respect to time following _____________ law?
A. Logarithmic
B. Exponential
C. Linear
D. Inverse square - The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then____________?
A. 3/4th of it will disintegrate in two months
B. It will completely disintegrate in two months
C. It will completely disintegrate in four months
D. 1/8th of it will remain intact at the end of four months - The most abundant isotope of natural uranium is ___________________?
A. 92U238
B. 92U235
C. 92U234
D. None of these - Radioactivity of an isotope is expressed in______________________?
A. Barn
B. MeV
C. Curie
D. Ergs - If 4 gm of a radioisotope has a half life period of 10 days, the half life of 2 gm of the same isotope will be ____________ days?
A. 5
B. 10
C. 20
D. 30 - Emission of β-particles during radioactive decay of a substance is from__________________?
A. Innermost shell
B. Nucleus
C. Outermost shell
D. None of these - The disintegration rate of a radioactive element _______________?
A. Progressively increases
B. Progressively decreases
C. Remains constant throughout
D. May increase or decrease depending on the material - Radioactive decay is a _____________ change?
A. Chemical
B. Nuclear
C. Physical
D. None of these - The half life period of a radioactive element depends upon the___________________?
A. Temperature
B. Pressure
C. Amount of element present
D. None of these - The new nucleus formed after β-decay of a radioactive element has___________________?
A. Less atomic number
B. Less atomic weight
C. More atomic number
D. More atomic weight
