Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 127

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

Certain radio-active substances reduces to 25% of itsvalue in 16 days. Its half-life is

A
32 days

B
8 days

C
64 days

D
28 days

Solution
Question 2
4 / -1

A
92, 236

B
88, 230

C
90, 234

D
91, 234

Solution
Question 3
4 / -1

The half-life of a radioactive substance against α–decay is 1.2 × 10⁷ s. What is the decay rate for 4 × 10¹⁵ atomsof the substance

A
4.6 × 10¹² atoms/s

B
2.3 × 10¹¹ atoms/s

C
4.6 × 10¹⁰ atoms/s

D
2.3 × 10⁸ atoms/s

Solution
Question 4
4 / -1

A radioactive material has an initial amount 16 g. After 120 days it reduces to 1 g, then the half-life of radioactive material is

A
60 days

B
30 days

C
40 days

D
240 days

Solution
Question 5
4 / -1

A
β–emission

B
α–emission

C
e^–capture

D
Fission
Question 6
4 / -1

A

B

C

D

Solution
Question 7
4 / -1

If ₉₂U²³⁸undergoes successively 8 α–decays and time6 β–decays, then resulting nucleus is

A
₈₂U²⁰⁶

B
₈₂Pb²⁰⁶

C
₈₂U²¹⁰

D
₈₂U²¹⁴

Solution
Question 8
4 / -1

The activity of a sample of a radioactive material is A at time t₁ and A₂ at time t₂(t₂> t₁). If its mean life is T, then

A
A₁t₁ = A₂t₂

B
A₁ – A₂ = t₂ – t₁

C
A₂ = A₁e^{(t₁–t₂)/T}

D
A₂ = A₁e^{(t₁–t₂)T}

Solution
Question 9
4 / -1

A

B

C

D

Solution
Question 10
4 / -1

Which of the following rays are not electromagnetic waves?

A
γ–rays

B
β–rays

C
Heat rays

D
X-rays