Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 128

Score
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Weekly Quiz Competition

Question 1
4 / -1

A sample of radioactive element has a mass of 10 g at an instant t = 0. The approximate mass of this element inthe sample after two mean lives is

A
2.50 g

B
3.70 g

C
6.30 g

D
1.35 g

Solution
Question 2
4 / -1

Radioactive nuclei that are injected into a patient collect at certain sites within its body, undergoing radioactive decay and emitting electromagnetic radiation. These radiations can then be recorded by a detector. This procedure provides an important diagnostic tool called

A
Gamma camera

B
CAT scan

C
Radiotracer technique

D
Gamma ray spectroscopy
Question 3
4 / -1

A radioactive decay chain starts from ₉₃Np²³⁷ and produces ₉₀Th²²⁹by successive emissions. The emitted particles can be

A
Two α–particles and one β–particle

B
Three β⁺ particles

C
One α particle and two β⁺ particles

D
One α–particle and two β^– particles

Solution
Question 4
4 / -1

The half-life of sample of a radioactive substance is 1 hour. If 8 × 10¹⁰ atoms are present at t = 0, then thenumber of atoms decayed in the duration t = 2 hour tot = 4 hour will be

A
2 × 10¹⁰

B
1.5 × 10¹⁰

C
Zero

D
Infinity

Solution
Question 5
4 / -1

Carbon dating is best suited for determining the age of fossils if their age in years is of the order of

A
10³

B
10⁴

C
10⁵

D
10⁶
Question 6
4 / -1

The half-life of radium is about 1600 years. Of 100 g of radium existing now, 25 g will remain unchanged after

A
2400 years

B
3200 years

C
4800 years

D
6400 years

Solution
Question 7
4 / -1

The half-life of a radioactive substance is 40 years. How long will it take to reduce to one fourth of its original amount and what is the value of decay constant

A
40 year, 0.9173/year

B
90 year, 9.017/year

C
80 year, 0.0173 year

D
None of these

Solution
Question 8
4 / -1

The half-life of a radioactive substance is 3.6 days. How much of 20 mg of this radioactive substance will remain after 36 days

A
0.0019 mg

B
1.019 mg

C
1.109 mg

D
0.019 mg

Solution
Question 9
4 / -1

A radioactive material has a half life of 10 days. What fraction of the material would remain after 30 days

A
0.5

B
0.25

C
0.125

D
0.33

Solution
Question 10
4 / -1

A
5 min

B

C
10 min

D
15 min

Solution