Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 123

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Weekly Quiz Competition

Question 1
4 / -1

The rate of disintegration of fixed quantity of a radioactive element can be increased by

A
Increasing the temperature

B
Increasing the pressure

C
Chemical reaction

D
It is not possible
Question 2
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
T/λ = 0.693

D
λ /T = 0.693

Solution
Question 3
4 / -1

Radon (Rn) decays int o Polonium (Po) by emitting an α– particle with half-life of 4 days. A sample contains 6.4 × 10¹⁰ atoms of Rn. After 12 days, the number ofatoms of Rn left in the sample will be

A
3.2 × 10¹⁰

B
0.53 × 10¹⁰

C
2.1 × 10¹⁰

D
0.8 × 10¹⁰

Solution
Question 4
4 / -1

Decay constant of radium is λ. By a suitable process its compound radium bromide is obtained. The decay constant of radium bromide will be

A
λ

B
More than λ

C
Less than λ

D
Zero
Question 5
4 / -1

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

A
1

B
2

C
4

D
8

Solution
Question 6
4 / -1

The decay constant of a radio isotope is λ. If A₁ and A₂ are its activities at times t₁ and t₂ respectively, the number of nuclei which have decayed during the time(t₁–t₂)

A
A₁t₁–A₂t₂

B
A₁– A₂

C
(A₁– A₂) /λ

D
λ (A₁– A₂)

Solution
Question 7
4 / -1

Which of the following is a correct statement?

A
Beta rays are same as cathode rays

B
Gamma rays are high energy neutrons

C
Alpha particles are singly ionized helium atoms

D
Protons and neutrons have exactly the same mass

Solution
Question 8
4 / -1

Half lives of two radioactive substances A and B are respectively 20 minutes and 40 minutes. Initially the sample of A and B have equal number of nuclei. After 80 minutes, the ratio of remaining number of A and B nuclei is

A
1 : 16

B
4 : 1

C
1 : 4

D
1 : 1

Solution
Question 9
4 / -1

A nucleus _nX^m emits one α and one β particles. The resulting nucleus is

A
_nX^m–4

B
_n–2X^m–4

C
_n–4X^m–4

D
_n–1X^m–4

Solution
Question 10
4 / -1

If the radioactive decay constant of radium is 1.07 × 10^–4 per year, than its half life period is approximately equal to

A
8,900 years

B
7,000 years

C
6,476 years

D
2,520 years

Solution