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.
A circular coil of 100 turns and radius $\left(\frac{10}{\sqrt{\pi}}\right)$ cm carrying current of $5.0\,\text{A}$ is suspended vertically in a uniform horizontal magnetic field of $2.0\,\text{T}$. The field makes an angle $30^\circ$ with the normal to the coil. Calculate:
(I) the magnetic dipole moment of the coil, and
(II) the magnitude of the counter torque that must be applied to prevent the coil from turning.

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2.
A ray of light MN is incident normally on the face corresponding with side AB of a prism with an isosceles right-angled triangular base ABC. Trace the path of the ray as it passes through the prism when the refractive index of the prism material is (i) $\sqrt{2}$, and (ii) $\sqrt{3}$.

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3.
The resistance of a metal wire at $20^\circ\text{C}$ is $1.05\,\Omega$ and at $100^\circ\text{C}$ is $1.38\,\Omega$. Determine the temperature coefficient of resistivity of this metal.

View Solution

4.
A current of $4.0\,\text{A}$ flows through a wire of length $1\,\text{m}$ and cross-sectional area $1.0\,\text{mm}^2$, when a potential difference of $2\,\text{V}$ is applied across its ends. Calculate the resistivity of the material of the wire.

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5.
A parallel beam of monochromatic light falls normally on a single slit of width $a$ and a diffraction pattern is observed on a screen placed at distance $D$ from the slit. Explain:
(I) the formation of maxima and minima in the diffraction pattern, and
(II) why the maxima go on becoming weaker and weaker with its increasing number $n$.

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6.
A wire of length $L$ is bent round into (i) a square coil having $N$ turns and (ii) a circular coil having $N$ turns. The coil in both cases is free to turn about a vertical axis coinciding with the plane of the coil, in a uniform, horizontal magnetic field and carry the same currents. Find the ratio of the maximum value of the torque acting on the square coil to that on the circular coil.

View Solution

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

2.
A ray of light MN is incident normally on the face corresponding with side AB of a prism with an isosceles right-angled triangular base ABC. Trace the path of the ray as it passes through the prism when the refractive index of the prism material is (i) $\sqrt{2}$, and (ii) $\sqrt{3}$.

3.
The resistance of a metal wire at \(20^\circ\text{C}\) is \(1.05\,\Omega\) and at \(100^\circ\text{C}\) is \(1.38\,\Omega\). Determine the temperature coefficient of resistivity of this metal.

4.
A current of \(4.0\,\text{A}\) flows through a wire of length \(1\,\text{m}\) and cross-sectional area \(1.0\,\text{mm}^2\), when a potential difference of \(2\,\text{V}\) is applied across its ends. Calculate the resistivity of the material of the wire.

Similar Physics Concepts

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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

2.A ray of light MN is incident normally on the face corresponding with side AB of a prism with an isosceles right-angled triangular base ABC. Trace the path of the ray as it passes through the prism when the refractive index of the prism material is (i) $\sqrt{2}$, and (ii) $\sqrt{3}$.

3.The resistance of a metal wire at \(20^\circ\text{C}\) is \(1.05\,\Omega\) and at \(100^\circ\text{C}\) is \(1.38\,\Omega\). Determine the temperature coefficient of resistivity of this metal.

4.A current of \(4.0\,\text{A}\) flows through a wire of length \(1\,\text{m}\) and cross-sectional area \(1.0\,\text{mm}^2\), when a potential difference of \(2\,\text{V}\) is applied across its ends. Calculate the resistivity of the material of the wire.

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

2.
A ray of light MN is incident normally on the face corresponding with side AB of a prism with an isosceles right-angled triangular base ABC. Trace the path of the ray as it passes through the prism when the refractive index of the prism material is (i) $\sqrt{2}$, and (ii) $\sqrt{3}$.

3.
The resistance of a metal wire at \(20^\circ\text{C}\) is \(1.05\,\Omega\) and at \(100^\circ\text{C}\) is \(1.38\,\Omega\). Determine the temperature coefficient of resistivity of this metal.

4.
A current of \(4.0\,\text{A}\) flows through a wire of length \(1\,\text{m}\) and cross-sectional area \(1.0\,\text{mm}^2\), when a potential difference of \(2\,\text{V}\) is applied across its ends. Calculate the resistivity of the material of the wire.