Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 56

Score
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Weekly Quiz Competition

Question 1
4 / -1

Radioactive substances do not emit

A
Electron

B
Helium nucleus

C
Positron

D
Proton
Question 2
4 / -1

In a radioactive substance at t = 0, the number of atoms is 8 × 10⁴. Its half life period is 3 years. The number of atoms 1 × 10⁴ will remain after interval

A
9 years

B
8 years

C
6 years

D
24 years

Solution
Question 3
4 / -1

Some radioactive nucleus may emit

A
Only one α, β or γ at a time

B
All the three α, β and γ one after another

C
All the three α, β and γ simultaneously

D
Only α and β simultaneously

Solution
Question 4
4 / -1

Which can pass through 20 cm thickness of the steel

A
α - particles

B
β - particles

C
γ - rays

D
Ultraviolet rays
Question 5
4 / -1

What percentage of original radioactive atoms is left after five half lives

A
0.3%

B
1%

C
31%

D
3.125%

Solution
Question 6
4 / -1

Alpha rays emitted from a radioactive substance are

A
Negatively charged particles

B
Ionised hydrogen nuclei

C
Doubly ionised helium atom

D
Uncharged particles having the mass equal to proton
Question 7
4 / -1

Half life of Bi²¹⁰ is 5 days. If we start with 50,000 atoms of this isotope, the number of atoms left over after 10 days is

A
5,000

B
25,000

C
12,500

D
20,000

Solution
Question 8
4 / -1

A nucleus of atomic mass A and atomic number Z emits β - particles. The atomic mass and atomic number of the resulting nucleus are

A
A, Z

B
A + 1, Z

C
A, Z + 1

D
A - 4, Z - 2

Solution
Question 9
4 / -1

The radioactivity of a certain radioactive element drops to 1/64 of its initial value in 30 sec. Its half life is

A
2 sec

B
4 sec

C
5 sec

D
6 sec

Solution
Question 10
4 / -1

The decay constant λ of the radioactive sample is the probability of decay of an atom in unit time, then

A
λ decreases as atoms become older

B
λ increases as the age of atoms increases

C
λ is independent of the age

D
Behavior of λ with time depends on the nature of the activity