Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 120

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Weekly Quiz Competition

Question 1
4 / -1

During a negative beta decay

A
An atomic electron is ejected

B
An electron which is already present within the nucleus is ejected

C
A neutron in the nucleus decays emitting an electron

D
A part of the binding energy is converted into electron

Solution
Question 2
4 / -1

The half-life period of radium is 1600 years. Its average life time will be

A
3200 years

B
4800 years

C
2319 years

D
4217 years

Solution
Question 3
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 4
4 / -1

Beta rays emitted by a radioactive material are

A
Electromagnetic radiation

B
The electrons orbiting around the nucleus

C
Charged particles emitted by nucleus

D
Neutral particles

Solution
Question 5
4 / -1

In the given reaction
_ZA^A → _Z–1Y^A → _Z–1K^A–4 → _Z–1K^A–4 radiations are emitted in the sequence

A
α, β, γ

B
β, α, γ

C
γ, α, β

D
β, γ, α

Solution
Question 6
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 7
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 8
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
Question 9
4 / -1

If T is the half life of a radioactive material, then the fraction that would remain after a time T/2 is

A

B

C

D

Solution
Question 10
4 / -1

If the decay or disintegration constant of a radioactive substance is λ, then its half life and mean life are respectively
( log_e 2 can be written as In 2)

A

B

C

D