NCERT Solutions For Class 11 Physics Chapter 2: Units and Measurements

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NCERT Solutions for Class 11 Physics Chapter 2 Units and Measurements deals with the various units of measurement. Measurement is a fundamental concept in science. Without the ability to measure, a theory or experiments cannot be deduced.

Chapter 2 Units and Measurements along with Unit 2 Kinematics and Unit 3 Laws of Motion has a weightage of 23 marks in the CBSE Class 11 Physics Examination. NCERT Solutions for Units and Measurements deal with the conversion of various units, conservation laws in physics, and fundamental forces in nature.

Download PDF: NCERT Solutions for Class 11 Physics Chapter 2

NCERT Solutions for Class 11 Physics Chapter 2

The NCERT Solutions for Chapter 2 Physics for Class 11 are as given below –

NCERT SOLUTIONS

NCERT SOLUTION

NCERT SOLUTION \

NCERT SOLUTION

Class 11 Physics Chapter 2 – Concepts Covered

To measure a physical quantity, we have to find how many times a standard amount of that quantity is present in the measured quantity. The number obtained is the magnitude and the standard chosen to represent it is the unit of the physical quantity.

The unit is a chosen standard that is widely accepted and in terms of which the other quantities are measured.

To express a measurement, the numerical value (n) and the unit (μ) of the quantity are needed.

Measurement of physical quantity = Numerical value x Unit

Fundamental Units do not require any other physical quantity to express them. They cannot be resolved further.

For example, in MKS system, the Mass, Length and Time which are expressed in kilogram, metre and second respectively are known as fundamental units.

Earlier different systems of units were followed to measure the quantities. Nowadays, the SI system is widely used.

As per SI Unit System,

Length – metre
Mass – kilogram
Time – second
Electric Current – Ampere
Thermodynamic temperature – Kelvin
Amount of substance – Mole
Luminous intensity – Candela

The dimensions of a physical quantity refer to the powers to which the fundamental units must be raised to represent a given physical quantity.

The dimensional formula is an expression demonstrating how the fundamental quantities enter into the unit of that quantity.

Class 11 Physics Chapter 2 Related Guides –

Fundamental and Derived Units of Measurement	Least count error	Precision of a measurement
Dimensional Analysis	Measurement of length	Measurement of mass
Micrometer	Screw Gauge	Unit of Force
Unit of Acceleration	Unit of Velocity	Unit of Momentum
Unit of Mass	Unit of Volume	Unit of Length

Class 11 Physics Study Guides:

NCERT Solutions for Class 11 Physics	Physics Formula	Physics Study Notes
Difference between in Physics	Relation between articles in Physics	SI Units in Physics
Derivations in Physics	Physics Constants	Class 11 Physics Notes

CBSE CLASS XII Related Questions

1.
Consider the nuclear reaction $ X \to Y + Z $. Let $ M_x $, $ M_y $, and $ M_z $ be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

$ (M_x - M_z)<M_y $
$ (M_x - M_y)<M_z $
$ M_x>(M_y + M_z) $
$ M_x<(M_y + M_z) $

View Solution

2.
A charged particle $+q$ in an electric field $\vec{E}$ experiences a force in the direction of the electric field. As a result, its kinetic energy changes. Similarly, the charged particle also experiences a force when it moves in a magnetic field $\vec{B}$. But this magnetic force is perpendicular to both velocity $\vec{v}$ of the charged particle and the magnetic field $\vec{B}$, so it cannot change the kinetic energy of the charged particle. Consider two charged particles 1 and 2 of masses $m$ and $\frac{m}{2}$ having charges $-q$ and $+2q$ respectively. They are accelerated from rest through the same potential difference $V$ and acquire kinetic energy $K_1$ and $K_2$. Then they enter in a region of uniform magnetic field $\vec{B}$ perpendicular to their velocities.

3.
Consider a cylindrical conductor of length $ l $ and area of cross-section $ A $. Current $ I $ is maintained in the conductor and electrons drift with velocity $ \vec{v}_d \, (|\vec{v}_d| = \frac{eE}{m} \tau) $, where symbols have their usual meanings. Show that the conductivity of the material of the conductor is given by \[ \sigma = \frac{n e^2 \tau}{m}. \]

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4.
Write two advantages of reflecting telescope over refracting telescope.

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5.
An electric field $\vec{E}$ is established across the ends of a cylindrical conductor of length L and area of cross-section A. Discuss how electrons attain an average velocity, independent of time. Hence, obtain a relation between current in the conductor and this ‘average velocity’ of electrons.

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6.
Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?

The total charge of the two spheres is conserved.
Both spheres attain the same potential.
The final potential of the system equals $\frac{1}{4\pi\epsilon_0} \frac{(q_1 + q_2)}{(r_1 + r_2)}$
The final potential of the system equals $\frac{1}{4\pi\epsilon_0} \frac{(q_1 + q_2) (r_1 + r_2)}{r_1 r_2}$

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NCERT Solutions For Class 11 Physics Chapter 2: Units and Measurements

NCERT Solutions for Class 11 Physics Chapter 2

Class 11 Physics Chapter 2 – Concepts Covered

CBSE CLASS XII Related Questions

1.
Consider the nuclear reaction \( X \to Y + Z \). Let \( M_x \), \( M_y \), and \( M_z \) be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

4.
Write two advantages of reflecting telescope over refracting telescope.

6.
Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?

Similar Physics Concepts

Comments

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NCERT Solutions For Class 11 Physics Chapter 2: Units and Measurements

NCERT Solutions for Class 11 Physics Chapter 2

Class 11 Physics Chapter 2 – Concepts Covered

CBSE CLASS XII Related Questions

1.Consider the nuclear reaction \( X \to Y + Z \). Let \( M_x \), \( M_y \), and \( M_z \) be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

4.Write two advantages of reflecting telescope over refracting telescope.

6.Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
Consider the nuclear reaction \( X \to Y + Z \). Let \( M_x \), \( M_y \), and \( M_z \) be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

4.
Write two advantages of reflecting telescope over refracting telescope.

6.
Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?