Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 84

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Weekly Quiz Competition

Question 1
4 / -1

A gamma ray photon creates an electron-positron pair. If the rest mass energy of an electron is 0.5 MeV and the total K.E. of the electron-positron pair is 0.78 MeV, then the energy of the gamma ray photon must be

A
0.78 MeV

B
1.78 MeV

C
1.28 MeV

D
0.28 MeV

Solution
Question 2
4 / -1

In a fission process, nucleus A divides onto two nuclei B and C, their binding energies being E_a, E_b and E_c, respectively. Then

A
E_b + E_c = E_a

B
E_b + E_c > E_a

C
E_b + E_c < E_a

D
E_b + E_c = E_a

Solution
Question 3
4 / -1

Complete the equation for the following fission process

A

B

C

D

Solution
Question 4
4 / -1

The example of nuclear fusion is

A
Formation of barium and krypton from uranium

B
Formation of helium from hydrogen

C
Formation of plutonium 235 from uranium 235

D
Formation of water from hydrogen and oxygen

Solution
Question 5
4 / -1

Energy in the sun is generated mainly by

A
Fusion of radioactive material

B
Fission of helium atoms

C
Chemical reaction

D
Fusion of hydrogen atoms
Question 6
4 / -1

When a slow neutron goes sufficiently close to a U²³⁵ nucleus, then the process that takes place is

A
Fission of U²³⁵

B
Fusion of neutron

C
Fusion of U²³⁵

D
First (1) then (2)
Question 7
4 / -1

Which of the following is a fusion reaction ?

A

B

C

D
None of the above
Question 8
4 / -1

Energy released in fusion of 1 kg of deuterium nuclei

A
8 × 10¹³ J

B
6 × 10²⁷ J

C
2 × 10⁷ kwh

D
8 × 10²³ MeV

Solution
Question 9
4 / -1

Which of the following is true for a sample of isotope containing U²³⁵ and U²³⁸?

A
Number of neutrons are same in both

B
Number of protons, electrons and neutrons are same in both

C
Contain same number of protons and electrons but U²³⁸ contains 3 more neutrons than U²³⁵

D
U²³⁸ contains 3 less neutrons than U²³⁵
Question 10
4 / -1

During the β - decay

A
An atomic electron is ejected

B
An electron, already present within the nucleus, is ejected

C
A proton in the nucleus decays emitting an electron

D
A neutron in the nucleus decay emitting an electron

Solution