Nuclei Test

Result

Nuclei Test - 16

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
1 / -0

Joining of light nuclei of elements to form a heavy nucleus with the release of energy is called :

A
nuclear fission

B
nuclear fusion

C
nuclear combustion

D
nuclear combination

Solution

Answer is B.

In nuclear physics, nuclear fusion is a nuclear reaction in which two or more atomic nuclei collide at a very high speed and join to form a new type of atomic nucleus. During this process, matter is not conserved because some of the matter of the fusing nuclei is converted to photons (energy).
Question 2
1 / -0

Which is the lightest element in the universe?

A
Helium

B
Hydrogen

C
Nitrogen

D
Silicon

Solution

$$\text {Hydrogen}$$ is the lightest element in the universe with atomic number $$1$$ and so, it has the simplest atomic structure.
Question 3
1 / -0

The two elements, with same number of electrons but different mass number, are known as

A
isotopes

B
isomers

C
isotones

D
isobars

Solution

Two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
Question 4
1 / -0

The order of magnitude of radius of nucleus is ___________.

A
$$10^{-15} m$$

B
$$10^{15} m$$

C
$$10^{-10} m$$

D
$$10^{10} m$$
Solution
$$10^{-15}$$ m
The order of magnitude of nuclear radii is 1 fermi = $$ 10^{-15}$$ meters.
Question 5
1 / -0

Fusion reactions take lace at high temperature because

A
atoms are ionized at high temperature

B
molecules break up at high temperature

C
nuclei break up at high temperature

D
kinetic energy is high enough to overcome repulsion between nuclei

Solution

Extremely high temps needed for fusion because $$K.E.$$ should large enough to overcome repulsion between nuclei.
Question 6
1 / -0

If the binding energy per nucleon for $$_{3}{Li}^{7}$$ is $$5.6 MeV$$, the total binding energy of a lithium nucleus is?

A
$$139.2 MeV$$

B
$$39.2 MeV$$

C
$$15.8 MeV$$

D
$$115.8 MeV$$

Solution

Binding energy per nucleon = 5.6 MeV
No. of nucleon = No. of proton + No. of neutron
=3 + 4 = 7
So, for 7 Nucleon $$=7\times 5.6 \\=39.2MeV$$
Question 7
1 / -0

In the options below which one of the isotope of the uranium can cause fission reaction?

A
$$U_{234}$$

B
$$U_{235}$$

C
$$U_{237}$$

D
$$U_{238}$$

Solution

2.5 neutrons on the average are released by the fission of each Uranium-235 nucleus that absorbs a low energy neutron.
Question 8
1 / -0

The average binding energy per nucleon is maximum for the nucleus

A
$$_{ 2 }H^{ 4 }$$

B
$$_{ 8 }O^{ 16 }$$

C
$$_{ 26 }Fe^{ 56 }$$

D
$$_{ 92 }U^{ 238 }$$

Solution

Binding energy per nucleon increases with atomic number. The greater the binding energy per nucleon the more stable is the nucleus.
For $$_{ 26 }Fe^{ 56 }$$ number of nucleons is $$56.$$
This is most stable nucleus, since maximum energy is needed to pull a nucleon away from it.
Question 9
1 / -0

Which of the following is the radio-isotope?
$$_{19}^{39}K, _{19}^{40}K$$

A
$$_{19}^{39} K$$

B
$$_{19}^{40} K$$

C
$$_{19}^{39} K, _{19}^{40} K$$

D
none of them

Solution

$${}_{19}^{40}K$$ is the radioactive isotope of Potassium element.
As it has more number of neutrons than number of protons.
Question 10
1 / -0

The mass number of sulfur atom is:

(Given: Atomic number = 16 and number of neutrons = 16)

A
18

B
32

C
24

D
16

Solution

Atomic number = number of protons = $$16$$

Mass number = Number of protons + number of neutrons

So the mass number of sulfur = $$32$$

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Nuclei Test - 16

Result

Nuclei Test - 16

Score

-

Rank

-

SHARING IS CARING

Question 1

nuclear fission

nuclear fusion

nuclear combustion

nuclear combination

Solution

Question 2

Helium

Hydrogen

Nitrogen

Silicon

Solution

Question 3

isotopes

isomers

isotones

isobars

Solution

Question 4

$$10^{-15} m$$

$$10^{15} m$$

$$10^{-10} m$$

$$10^{10} m$$

Solution

Question 5

atoms are ionized at high temperature

molecules break up at high temperature

nuclei break up at high temperature

kinetic energy is high enough to overcome repulsion between nuclei

Solution

Question 6

$$139.2 MeV$$

$$39.2 MeV$$

$$15.8 MeV$$

$$115.8 MeV$$

Solution

Question 7

$$U_{234}$$

$$U_{235}$$

$$U_{237}$$

$$U_{238}$$

Solution

Question 8

$$_{ 2 }H^{ 4 }$$

$$_{ 8 }O^{ 16 }$$

$$_{ 26 }Fe^{ 56 }$$

$$_{ 92 }U^{ 238 }$$

Solution

Question 9

$$_{19}^{39} K$$

$$_{19}^{40} K$$

$$_{19}^{39} K, _{19}^{40} K$$

none of them

Solution

Question 10

18

32

24

16

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.