Q: The strongest fundamental force in nature is

ForceRelative Strength Electromagnetic force \${10}^{-3}\$ Strong nuclear force \$1\$ Weak nuclear force \${10}^{-13}\$ Gravitational force \${10}^{-40}\$Strongest is the strong nuclear force .

Q: Which of the following is not correct about nuclear forces?

\$\begin{array}{l}\text { Inshort range that is less than } 0.7 \mathrm{fm} \text { the nuclear force } \\\text { becomes repulsive. }\end{array}\$

Question 1

Which of the following is not a fundamental force ?

Accepted Answer

There are 4 fundamental forces, which are as follows :1) Gravitational Force2) Weak Nuclear force3) Strong nuclear force4) Electromagnetic forceHence, frictional force is not a fundamental force. Thus, option D is correct.

Question 2

Which force is weakest of all fundamental forces?

Accepted Answer

Gravitational force is the attraction between two masses.Electromagnetic force is the force between two charged particles or two poles of a magnet. It is stronger than Gravitational.Weak nuclear force is the weak force of attraction between the subatomic particles of the nucleus of an atom. Though the name suggests that it is weak, it is stronger than electromagnetic.Strong nuclear force is the stronger version of nuclear force.It is the strongest force in nature.

Question 3

Classical Physics deals mainly with macroscopic phenomena and includes subjects like Mechanics, Electrodynamics, Optics and Thermodynamics.

Accepted Answer

Classical physics is inadequate to handle microscopic domain and Quantum Theory is currently accepted as the proper framework for explaining microscopic phenomena as it deals with the constitution and structure of matter at the minute scales of atoms and nuclei.

Question 4

The branch of science which deals with nature and natural phenomena is called

Accepted Answer

The branch of science concerned with the nature and properties of matter and energy is called Physics. The subject matter of physics includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms.Hence option D is the correct answer.

Question 5

The strongest fundamental force in nature is

Accepted Answer

ForceRelative Strength  Electromagnetic force ${10}^{-3}$ Strong nuclear force $1$ Weak nuclear force ${10}^{-13}$ Gravitational force ${10}^{-40}$Strongest is the strong nuclear force .

Question 6

Which of the following is not correct about nuclear forces?

Accepted Answer

$\begin{array}{l}\text { Inshort range that is less than } 0.7 \mathrm{fm} \text { the nuclear force } \\text { becomes repulsive. }\end{array}$

Question 7

What is the contribution of S. Chandra sekhar to physics?

Accepted Answer

S. Chandrasekhar was an Indian-born American astrophysicist who, with William A. Fowler, won the 1983 Nobel Prize for Physics for key discoveries that led to the currently accepted theory on the later evolutionary stages of massive stars.&#10;&#10;By the early 1930s, scientists had concluded that after converting all of their hydrogens to helium stars lose energy and contract under the influence of their own gravity. These stars, known as white dwarf stars, contract to about the size of Earth, and the electrons and nuclei of their constituent atoms are compressed to a state of extremely high density. Chandrasekhar determined what is known as the Chandrasekhar limit&#8212;that a star having a mass more than 1.44 times that of the Sun does not form a white dwarf but instead continues to collapse, blows off its gaseous envelope in a supernova explosion, and becomes a neutron star. An even more massive star continues to collapse and becomes a black hole. These calculations contributed to the eventual understanding of supernovas, neutron stars, and black holes.&#10;&#10;He did important work on energy transfer by radiation in stellar atmospheres and convention on the solar surface. He also attempted to develop the mathematical theory of black holes, describing his work in The Mathematical Theory of Black Holes (1983).&#10;&#10;His other books include An Introduction to the Study of Stellar Structure (1939), Principles of Stellar Dynamics (1942), Radiative Transfer (1950), Hydrodynamic and Hydromagnetic Stability (1961), Truth and Beauty: Aesthetics and Motivations in Science (1987), and Newton&#8217;s Principia for the Common Reader(1995).

Question 8

A force can change the shape and volume of an object.

Accepted Answer

A force can change the shape and volume of an object. This is one of the effect of force. When we squeeze a metal can, its shape and volume both change. So, the given statement will be true.

Question 9

Why does the police used dogs for detective work?

Accepted Answer

Dog's eyesight,smelling power and hearing capability is very good. It can even listen the ultrasonic waves. So police use dog for detective work.

Question 10

Which of the following is a contact force ?

Accepted Answer

Frictional forces arise when two bodies come in contact with each other (b).