Micro-Curie of radioactivity is equal to A. 3.7×104 Bq B. 14 Bq C. 17×1010 Bq C. 3.7×102 13

A. 3.7×10⁴ Bq B. 14 Bq

C. 17×10¹⁰ Bq C. 3.7×10²
13. 1 Rutherford (R) is equal to

A. 3.7×10^-5 Ci B. 2.7×10^-5 Ci

C. 2.7×10^-6 Ci D. 3.7×10^-6 Ci
14. In one average life

A. half the active nuclei decay B. more than half the active nuclei decay

C. less than half the active nuclei decay D. none of these
15. Which is the correct relation between half life and decay constant?

A. T_1/2/λ=0.693 B. λ T_1/2=0.693

C. T_1/2 =0.693λ D. 1/λT_1/2 =0.693
16. In Wilson cloud chamber the potential difference applied to clear the chamber from ions is

A. exactly 1 KV B. Exactly 2 KV

C. of the order of 1 kV D. of the order of 2 kV
17. The time to reach positive ions to the cathode is called GM counter

A. half time B. dead time

C. delay time D. average time

1 8. ₈ ¹⁷O + ₁¹H _z^AX + ₂⁴He find _z^AX

A. ₁²H B. ₂³He

C. ₂⁴He D. ₇¹⁴N