Physical World - Online Test
Q1. Strong Nuclear Force is
Answer : Option A
Explaination / Solution:
In particle physics, the strong interaction is the mechanism responsible for the strong nuclear force (also called the strong force or nuclear strong force), and is one of the four known fundamental interactions, with the others being electromagnetism, the weak interaction and gravitation. At the range of 10−15 m (femtometer), the strong force is approximately 137 times as strong as electromagnetism, a million times as strong as the weak interaction and 1038times as strong as gravitation.
Q2. Strong Nuclear Force has
Answer : Option C
Explaination / Solution:
Strong Nuclear Force : The nucleus is held by the forces which protect them from the enormous repulsion forces of the positive protons. It is a force with short range and not similar to the electromagnetic force. We know that the nucleus is made up with its fundamental particles that are the protons and neutrons. These are formed with quarks which are held together with strong force. This strong force is residual color force. The basic exchange particle is called gluon which works as mediator forces between quarks. Both the particles; gluons and quarks are present in protons and neutrons.
Q3. The sun releases energy coming from
Answer : Option B
Explaination / Solution:
In addition to intense heat, there is an incredible amount of pressure at the Sun's core. In fact, the vast amounts of hydrogen atoms in the Sun's core are compressed and heated so much that they fuse together.
This reaction, known as nuclear fusion, converts hydrogen atoms into helium. The by-product of nuclear fusion in the Sun's core is a massive volume of energy that gets released and radiates outward toward the surface of the Sun and then into the solar system beyond it.
Q4. Weak Nuclear Force
Answer : Option A
Explaination / Solution:
The weak nuclear force stops a neutron from decaying into a proton and an electron. When this happens, an electron leaves the atom. This is known as beta decay.
Q5. The difference between nuclear forces and electromagnetic forces is that
Answer : Option A
Explaination / Solution:
The nuclear force does not depend upon the charge of nucleons.Nuclear forces usually depend upon the velocity of the nucleons.
Q6. In β-decay, the nucleus emits.
Answer : Option A
Explaination / Solution:
In nuclear physics, beta decay (β-decay) is a type of radioactive decay in which a beta ray (fast energetic electron or positron), and a neutrino are emitted from an atomic nucleus. For example, beta decay of a neutron transforms it into a proton by the emission of an electron, or conversely a proton is converted into a neutron by the emission of a positron (positron emission), thus changing the nuclide type.
Q7. The fundamental force with the shortest range is
Answer : Option C
Explaination / Solution:
There are four fundamental forces in nature which are Gravitational force, Strong force, Weak force and Electromagnetic force.
Gravitational Force: This force is the weakest but has an infinite range.
Strong Nuclear force: This force holds the nucleus of an atom together. It is the strongest of the forces. It acts over a range of about 10-15m.
Weak Nuclear Force: This force is weak compared to the strong force as the name implies and has the shortest
range of 10-18m
Electromagnetic Force: This is the second strongest force after the strong force and it acts on electrically charged particles. It has strength of 1/137 relative to the strong force but has an infinite range.
Q8. in every conservation principle
Answer : Option C
Explaination / Solution:
In physics, a conservation law states that a particular measurable property of an isolated physical system does not change as the system evolves over time. Exact conservation laws include conservation of energy, conservation of linear momentum, conservation of angular momentum, and conservation of electric charge.
Q9. for motion under an external conservative force
Answer : Option D
Explaination / Solution:
Mechanical energy is the sum of the potential and kinetic energies in a system. The principle of the conservation of mechanical energy states that the total mechanical energy in a system (i.e., the sum of the potential and kinetic energies) remains constant as long as the only forces acting are conservative forces.
Q10. The law of conservation of energy is.
Answer : Option B
Explaination / Solution:
The law of conservation of energy is thought to be valid across all domains of nature, from the microscopic to the macroscopic. It is routinely applied in the analysis of atomic, nuclear and elementary particle processes. At the other end. all kinds of violent phenomena occur in the universe all the time. Yet the total energy of the universe (the most ideal isolated system possible!) is believed to remain unchanged.
