Topic: Nuclear Chemistry

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Q:

(a) :  A
(b) :  B
(c) :  C
(d) :  D
Answer:  A
Explanation:  
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Q:

What is the half-life of a radioactive substance if 87.5% of any given amount of the substance disintegrates in 40 minutes

(a) :  160 min
(b) :   10 min
(c) :  20 min
(d) :  13 min 20 sec
Answer:  13 min 20 sec
Explanation:  
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Q:

(a) :  A
(b) :  B
(c) :  C
(d) :  D
Answer:  C
Explanation:  
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Q:

(a) :  A
(b) :  B
(c) :  C
(d) :  D
Answer:  A
Explanation:  
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Q:

(a) :  A
(b) :  B
(c) :  C
(d) :  D
Answer:  B
Explanation:  
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Q:

Number of --particles emitted per second by a radioactive element falls to 1/32 of its original value in 50 days. The half-life-period of this elements is

(a) :  5 days
(b) :  15 days
(c) :  10 days
(d) :  20 days
Answer:  10 days
Explanation:  
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Q:

(a) :  A
(b) :  B
(c) :  C
(d) :  D
Answer:  B
Explanation:  
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Q:

(a) :  A
(b) :  B
(c) :  C
(d) :  D
Answer:  B
Explanation:  
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Q:

A radioactive sample has a half-life of 1500 years.A sealed tube containing 1gm of the sample will contain after 3000 years

(a) :  1gm of the sample
(b) :  0.5gm of the sample
(c) :  0.25gm of the sample
(d) :   0.00gm of the sample
Answer:  0.25gm of the sample
Explanation:  
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