4.For Tutor Adil B Only! For Tutor Adil B Only! For Tutor Adil B Only! For Tutor Adil B Only! For Tutor Adil B Only!
7.Photon has mass or not? I am confused, since we say, it has zero rest mass but how does it is affected by gravity then?
Classical Physics deals with the description of state or motion of a particle at macroscopic level. It involves study of state, motion, change, energies and transformation associated with the body at wider dimensions. It includes classical mechanics, classical thermodynamics and electromagnetism. In classical physics, any particle is characterized as a point particle and further associated parameters to define and study the particle are taken into consideration at macroscopic level.
Question 1: Which of the following forces acts away from the body?
a) Magnetic force b) Tensile force
c) Friction force d) Reaction force
Answer: b) Tensile force
Explanation: Tensile force is an external force which acts away from the body. It is a stretching force applied to a body away from it.
Question 2: When the work done by a particle moving around the closed loop is zero, then the force is said to be ____________.
a) zero force b) non-conservative force
c) conservative force d) none of these
Answer: c) conservative force
Explanation: In conservative force, work is independent of the path. A force is said to be conservative if the work done by the particle over a closed path is zero.
Question 3: The shortest distance between any two points in a plane is __________.
a) circle b) parabola
c) ellipse d) straight line
Answer: d) straight line
Explanation: The shortest distance between the two points is the length of the straight line drawn from one point to another.
Question 4: What is the path of the particle moving under a constant conservative field ?
a) Hyperbolic b) Parabolic
c) Cycloid d) Ellipsoidal
Answer: c) Cycloid
Explanation: A particle moving under conservative force moves in a cycloidal path.
Question 5: Inertial frame is a frame of reference that moves with a __________ velocity relative to a fixed frame.
a) constant b) uniform
c) Non-uniform d) accelerated
Answer: a) constant
Explanation: In an inertial frame of reference, the body remains at rest or moves with a constant relative to an inertial system or fixed frame.
Question 6: Which of the following Newton’s laws of motion defines an inertial frame of reference?
a) Newton’s first law b) Newton’s second law
c) Newton’s third law d) All of these
Answer: a) Newton’s first law
Explanation: Newton’s first law defines an inertial frame of reference which describes that body remains at rest or in motion unless an external force is applied to it.
Question 7: Newton’s second law of motion is applicable only on the body travelling with a constant ___________.
a) velocity b) acceleration
c) speed d) all of these
Answer: b) acceleration
Explanation: Newton’s second law describes that application of constant force causes the body to accelerate or change its velocity at constant rate.
Question 8: In the conservation of energy, the sum of total mechanical energy of the system remains _________.
a) zero b) one
c) constant d) none of these
Answer: c) constant
Explanation: The conservation of total mechanical energy states that the sum of potential energy and kinetic energy always remains constant.
Question 9: Which of the following quantities describes the quantitative measure of inertia?
a) Weight b) Gravity
c) Force d) Mass
Answer: d) Mass
Explanation: Mass is described as a quantitative measure of inertia. Inertia is resistance that a body offers to a change in its state or motion upon the application of force. The greater the mass, the smaller the change or vice versa.
Question 10: Newton’s 1st law of motion is applicable for ____________.
a) Free particle b) Moving particle
c) Rest particle d) Accelerated particle
Answer: a) Free particle
Explanation: Newton’s first law is applicable on the particles without any constraint or under the application of external forces.