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Chemistry Quiz on HalfLife
Quiz on HalfLife: NEET/JEE Chemistry is considered to be the most scoring subject. 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 todo for chemistry. In this post we are providing you quiz on HalfLife.
Quiz on HalfLife
Q1. Uranium 238 forms thorium234 after radioactive decay and has a halflife of 4.5 x 10^{9} years. How many years will it take to decay 75% of the initial amount?
a) 4.5 x 10^{9} years
b) 9 x 10^{10} years
c) 4.5 x 10^{10} years
d) 9 x 10^{9} years
d) 9 x 10^{9} years
Q2. What would be the remaining concentration of 1 g of radioactive substance after 400 days if the halflife is 100 days?
a) 1/16
b) 1/4
c) 1/2
d) 1/8
a) 1/16
Q3. Which of the following radiations is the most penetrating?
a) ?
b) ?
c) ?
d) neutron
a) ?
Q4. Find the halflife of _{6}^{14}C if ? is 2.31 x 10^{4}.
a) 4 x 10^{3} years
b) 3 x 10^{3} years
c) 3.5 x 10^{4} years
d) 2 x 10^{2} years
b) 3 x 10^{3} years
Q5. How many milligrams of tritium will remain after 49.2 years if the starting amount is 32 mg? The halflife of tritium is 12.3 years.
a) 8 mg
b) 2 mg
c) 1 mg
d) 4 mg
b) 2 mg
Q6. 200 mg of ^{14}C will become 25 mg in how many years if the halflife is 5760 years?
a) 5760 years
b) 17280 years
c) 23040 years
d) 11520 years
b) 17280 years
Q7. If a body requires 0.01 m activity of radioactive substance (halflife = 6 hrs) after 24 hrs of injection then what is the maximum activity of injection to be injected?
a) 0.04
b) 0.32
c) 0.16
d) 0.08
c) 0.16
Q8. What would be the remaining concentration of 300 g of radioactive substance after 18 hours if the halflife is 3 hours?
a) 9.37 g
b) 2.34 g
c) 3.34 g
d) 4.68 g
d) 4.68 g
Q9. The radioactive isotope of phosphorus, P32 is used as a tracer in the liver. If 3.5 mg is left in a sample after 288 hrs then how much P32 was administered initially? [Halflife of P32 is 14.3 days]
a) 7 mg
b) 6.26 mg
c) 1.96 mg
d) 4.17 mg
b) 6.26 mg
Q10. What would be the remaining concentration of 10.4 micrograms of ^{231}Pa after 3.25 x 10^{5} years if the halflife is 3.25 x 10^{4} years?
a) 0.0240 micrograms
b) 2.18 micrograms
c) 1.4 micrograms
d) 0.0102 micrograms
d) 0.0102 micrograms
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