CBSE 11TH PHYSICS - Online Test

Answer : Option A
Explaination / Solution:

Average speed is the absolute value of the average velocity or the magnitude of the velocity. Average Speed is always positive.

Answer : Option A
Explaination / Solution:

In the equation y(x, t) = a sin (kx + ωt + φ ) the term before trignometric function is called amplitude Hence a (term before trignometric function) is the amplitude.

Answer : Option B
Explaination / Solution:

Potential energy is the stored energy of an object. It is the energy by virtue of an object's position relative to other objects. Potential energy is often associated with restoring forces such as a spring or the force of gravity. It is applicable only for conservative forces.

Answer : Option D
Explaination / Solution:

As per the definition of angular accerlation  that " it is the time rate of change of  angular velocity" , therefore  α=dωdt

Answer : Option B
Explaination / Solution:

Set of elements (vectors) in a vector space is called a basis, or a set of basis vectors, if the vectors are linearly independent and every vector in the vector space is a linear combination of this set.In more general terms, a basis is a linearly independent spanning set.

Given a basis of a vector space, every element of vector space can be expressed uniquely as a linear combination of basis vectors, whose coefficients are referred to as vector coordinates or components.

We can represent vector v as

v⃗ =xi^+yj^+zk^

Answer : Option A
Explaination / Solution:
No Explaination.

Answer : Option D
Explaination / Solution:

This is Meyer's Equation

At constant volume as there is no work done on the gas(ΔV=0) all the heat supplied goes for the increase of internal energy. Hence temperature of body increases with less supply of heat. Whereas at constant pressure heat supplied accounts for both internal energy and work done on the gas.

if we increase temp. of 1 mole of gas by 1K or 1C then

PΔV=nRΔTn=1moleΔT=1∘CPΔV=RW=PΔVCP>CVCP−CV=WCP−CV=R

This is also called Meyer's formula.

Answer : Option C
Explaination / Solution:

Microscopic domain includes atomic,molecular and nuclear phenomena. It can be said as the study of matter.It includes the study of structure and configuration of atom,nucleus and the constitute particles of atom-electron,proton,neutron and interaction with elementary particles like electron,photon etc.

Answer : Option D
Explaination / Solution:

When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body. According to Newton's law for every action there is always opposit and equal reaction or the mutual actions of two bodies upon each other are always equal and opposite in direction.

Answer : Option A
Explaination / Solution:

When a fluid is in motion, it must move in such a way that mass is conserved.Consider the steady flow of fluid through a duct (that is, the inlet and outlet flows do not vary with time). The inflow and outflow are one-dimensional, so that the velocity V and density ρ are constant over the area A.

Now we apply the principle of mass conservation. Since there is no flow through the side walls of the duct, what mass comes in overA1 goes out of A2, (the flow is steady so that there is no mass accumulation). Over a short time interval Δt

As volume is same so this equation can be written as 

A1V1=A2V2

This is a statement of the principle of mass conservation for a steady, one-dimensional flow, with one inlet and one outlet. This equation is called the continuity equation for steady one-dimensional flow.