Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 33

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Weekly Quiz Competition

Question 1
4 / -1

The relation between the half life T of a radioactive sample and its mean life t is

A
T = 0.693 t

B
t = 0.693 T

C
t = T

D
t = 2.718 T

Solution
Question 2
4 / -1

A radioactive nucleus can decay simultaneously by two different processes which have decay constants λ₁ and λ₂. The effective decay constant of the nuclide is λ, where

A

B

C

D
Question 3
4 / -1

A sample of radioactive material has mass m, decay constant λ and molecular weight M. Avogadro constant = N_A . The initial activity of the sample is

A
λ m

B

C

D
m N_A e^λ

Solution
Question 4
4 / -1

An element A decays into element C by a two step process
A → B₂ + He⁴
B → C + 2e^–
Then

A
A and C are isotopes

B
A and C are isobars

C
A and B are isotopes

D
A and B are isobars
Question 5
4 / -1

If the binding energy per nucleon in 3Le⁷ and 2He⁴ nuclei are respectively 5.60 MeV and 7.06 MeV, then the energy of proton in the reaction ₃Li⁷ → 2 ₂He⁴

A
19.6 MeV

B
2.4 MeV

C
8.4 MeV

D
17.3 MeV
Question 6
4 / -1

Which of the following undergo fission reaction easily by slow moving neutrons?

A
U-235, P-239

B
P-239, Th-234

C
U-238, Rn-232

D
Th-234, U-238
Question 7
4 / -1

In the Bohr’s model of hydrogen atom, the lowest orbit corresponds to

A
Infinite energy

B
The maximum energy

C
The minimum energy

D
Zero energy
Question 8
4 / -1

Ionisation potential of Hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. The spectral lines emitted by hydrogen atoms according to Bohr’s theory will be

A
One

B
Two

C
Three

D
Four

Solution
Question 9
4 / -1

The ratio of the frequencies of the long wavelength limits of the Lyman and Balmer series of hydrogen is

A
27 : 5

B
5 : 27

C
4 : 1

D
1 : 4

Solution
Question 10
4 / -1

A freshly prepared radioactive substance of half life 2 hour emits radiations of density 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this substance is

A
6 hours

B
12 hours

C
24 hours

D
128 hours

Solution