Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 37

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

A radioactive material has a half life of 10 days. What fraction of the material would remain after 30 days?

A
0.5

B
0.25

C
0.125

D
0.33

Solution
Question 2
4 / -1

Which of the following is not conserved in nuclear reactions?

A
total energy

B
mass number

C
charge number

D
number of fundamental particles
Question 3
4 / -1

In a sample of radioactive material, what fraction of the initial number of active nuclei will remain undisintegrated after half of a half life of the sample?

A

B

C

D

Solution
Question 4
4 / -1

A radioactive nucleus is being produced at a constant rate ∝ per second. Its decay constant is λ. If N₀ are the number of nuclei at time t = 0, then the maximum number of nuclei possible are

A

B
N₀

C

D

Solution
Question 5
4 / -1

The binding energies of nuclei X and Y are E₁ and E₂ respectively. Two atoms of X fuse to give one atom of Y and an energy Q is released. Then

A
Q = 2E₁ – E₂

B
Q > (E₂ – 2E₁)

C
Q < (2E₁ – E₂)

D
Q = E₂ – 2E₁
Question 6
4 / -1

The binding energy of an electron in the ground state of He is equal to 24.6 eV. The energy required to remove both the electrons is

A
49.2 eV

B
24.6 eV

C
38.2 eV

D
79.0 eV
Question 7
4 / -1

A particle of mass 3 m at rest decays into two particles of masses m and 2m having non zero velocities. The ratio of the de-Broglie wavelength of the particles (λ₁/λ₂) is

A
1

B
2

C
3

D
1/2

Solution
Question 8
4 / -1

The order of energies of energy levels A, B and C is E_A < E_B < E_C. If the wavelength corresponding to transitions C → B, B → A and C→ A are λ₁, λ₂ and λ₃ respectively, then which of the following relation is correct?

A

B

C

D

Solution
Question 9
4 / -1

The energy required to excite an electron from n = 2 to n = 3 energy level is 47.2 eV. The charge no. of the nucleus, around which the electron is revolving will be

A
5

B
10

C
15

D
20

Solution
Question 10
4 / -1

The ratio (R) of the rate of production of neutrons to the rate of leakage of neutrons from a spherical body of uranium of radius r is proportional to

A
R ∝ r

B

C
R ∝ r²

D

Solution