Pick out the wrong statement?

Related Mcqs:

1. Pick out the wrong statement?

   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

2. Pick out the wrong statement?

   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

3. Pick out the wrong statement?

   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

4. Pick out the wrong statement?

   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

5. Pick out the correct statement?

   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

6. Pick out the correct statement?

   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

7. Thorium can be converted into U-233 in a _____________ reactor?

   A. Liquid metal cooled
   B. Fast breeder
   C. Thermal
   D. Swimming pool

8. Hydrogen differs from deuterium in _____________ properties?

   A. Radioactive
   B. Physical
   C. Chemical
   D. All A., B. and C.

9. Mass of a positron is same as that of a/an__________________?

   A. Electron
   B. α-particle
   C. Proton
   D. Neutron

10. Which of the following is a moderating material used in nuclear reactor ?

    A. Graphite
    B. Cadmium
    C. Zircaloy (an alloy of zirconium and aluminium)
    D. Stainless steel