Subject: Physics (Part-ii) Time: 40 Min chapter # 21 mcq’s for entry test


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



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Ch[1]. No. 21
12. Micro-Curie of radioactivity is equal to

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. T1/2/λ=0.693 B. λ T1/2=0.693

C. T1/2 =0.693λ D. 1/λT1/2 =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 zAX + 24He find zAX

A. 12H B. 23He

C. 24He D. 714N


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