MCQ on Half Life: Chemistry is considered to be the most scoring subject in NEET JEE Exam. As it is one of the easiest scoring subjects, it is often ignored and undermined a subject. But if you want to get an edge over others, here is a tip, master NEET/JEE Chemistry concepts. Chemistry demands the attention of students in understanding reactions and concrete basic understanding but once done it only gets easier from there. Mastering NCERT syllabus for NEET/JEE Chemistry should be topping your list of to-do for chemistry.

In this post we are providing you MCQ on Half Life, which will be beneficial for you in upcoming NEET, JEE, Medical and Engineering Exams.

MCQ on Half Life

Q1. Which of the following radiations is the most penetrating?
a) 𝞬
b) 𝜶
c) 𝜷
d) neutron

Q2. What would be the remaining concentration of 10.4 micrograms of ²³¹Pa after 3.25 x 10⁵ years if the half-life is 3.25 x 10⁴ years?
a) 0.0102 micrograms
b) 0.0240 micrograms
c) 1.4 micrograms
d) 2.18 micrograms

Q3. What would be the remaining concentration of 300 g of radioactive substance after 18 hours if the half-life is 3 hours?
a) 2.34 g
b) 3.34 g
c) 4.68 g
d) 9.37 g

Q4. The radioactive isotope of phosphorus, P-32 is used as a tracer in the liver. If 3.5 mg is left in a sample after 288 hrs then how much P-32 was administered initially? [Half-life of P-32 is 14.3 days]
a) 1.96 mg
b) 4.17 mg
c) 6.26 mg
d) 7 mg

Q5. 200 mg of ¹⁴C will become 25 mg in how many years if the half-life is 5760 years?
a) 5760 years
b) 17280 years
c) 11520 years
d) 23040 years

Q6. Uranium-238 forms thorium-234 after radioactive decay and has a half-life of 4.5 x 10⁹ years. How many years will it take to decay 75% of the initial amount?
a) 9 x 10¹⁰ years
b) 9 x 10⁹ years
c) 4.5 x 10⁹ years
d) 4.5 x 10¹⁰ years

Q7. How many milligrams of tritium will remain after 49.2 years if the starting amount is 32 mg? The half-life of tritium is 12.3 years.
a) 1 mg
b) 2 mg
c) 4 mg
d) 8 mg

Q8. What would be the remaining concentration of 1 g of radioactive substance after 400 days if the half-life is 100 days?
a) 1/2
b) 1/4
c) 1/8
d) 1/16

Q9. Find the half-life of ₆¹⁴C if 𝝺 is 2.31 x 10^-4.
a) 4 x 10³ years
b) 3 x 10³ years
c) 3.5 x 10⁴ years
d) 2 x 10² years

Q10. If a body requires 0.01 m activity of radioactive substance (half-life = 6 hrs) after 24 hrs of injection then what is the maximum activity of injection to be injected?
a) 0.04
b) 0.08
c) 0.16
d) 0.32

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By Team Learning Mantras