Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 87

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Weekly Quiz Competition

Question 1
4 / -1

Which one is correct about fission?

A
Approx. 0.1% mass converts into energy

B
Most of energy of fission is in the form of heat

C
In a fission of U²³⁵ about 200 eV energy is released

D
On an average, one neutron is released per fission of U²³⁵
Question 2
4 / -1

Consider a radioactive material of half-life 1.0 minute. If one of the nuclei decays now, the next one will decay

A
After 1 minute

B

C

D
After any time
Question 3
4 / -1

In which radioactive disintegration, neutron dissociates into proton and electron

A
He⁺¹ emission

B
β - emission

C
γ –emission

D
Positron emission
Question 4
4 / -1

Select the wrong statement

A
Radioactivity is a statistical process

B
Radioactivity is a spontaneous process

C
Radioactivity is neutral characteristics of few elements

D
Radioactive elements cannot be produced in the laboratory
Question 5
4 / -1

The relationship between λ and half life (T_1/2) of a radioactive substance is

A

B

C

D
Question 6
4 / -1

The half life (T) and the disintegration constant (λ) of a radioactive substance are related as

A
λT = 1

B
λT = 0.693

C

D

Solution
Question 7
4 / -1

In the uranium radioactive series, the initial nucleus is ₉₂U²³⁸ and the final nucleus is ₈₂Pb²⁰⁶. When the uranium nucleus decays to lead, the number of α - particles emitted will be

A
1

B
2

C
4

D
8

Solution
Question 8
4 / -1

The half life of ¹³¹I is 8 days. Given a sample of ¹³¹I at time t = 0, we can assert that

A
No nucleus will decay before t = 4 days

B
No nucleus will decay before t = 8 days

C
All nuclei will decay before t = 16 days

D
A given nucleus may decay at any time after t = 0

Solution
Question 9
4 / -1

Which of the following statements are true regarding radioactivity?
(I) All radioactive elements decay exponentially with time
(II) Half life time of a radioactive element is time required for one half of the radioactive atoms to disintegrate
(III) Age of earth can be determined with the help of radioactive dating
(IV) Half life time of a radioactive element is 50% of its average life period
Select correct answer using the codes given below Codes

A
I and II

B
I, III and IV

C
I, II and III

D
II and III
Question 10
4 / -1

The particles emitted by radioactive decay are deflected by magnetic field. The particles will be

A
Protons and α - particles

B
Electrons, protons and α - particles

C
Electrons, protons and neutrons

D
Electrons and α - particles