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 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

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. Heavy water is preferred over ordinary water as a coolant, because it?

   A. Acts both as an efficient coolant as well as a moderator
   B. Can be heated to a higher temperature without pressurizing
   C. Is less prone to radiation damage
   D. All A., B. and C.

8. Which of the following is not a good moderating material ?

   A. Concrete
   B. Boron
   C. 18/8 stainless steel
   D. All A., B. and C.

9. Heavy water has maximum density at ______________ °C ?

   A. 4
   B. 11.6
   C. 0
   D. 18.6

10. Nuclear fuel usually used in a Boiling Water Reactor (BWR) is__________________?

    A. Plutonium
    B. Enriched uranium
    C. Natural uranium
    D. Thorium