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.
Assertion (A) : All atoms have a net magnetic moment. Reason (R) : A current loop does not always behave as a magnetic dipole.
- Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
- Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
- Assertion (A) is true, but Reason (R) is false.
- Both Assertion (A) and Reason (R) are false.
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2.
Draw a circuit diagram of a full-wave rectifier using p-n junction diodes. Explain its working and show the input-output waveforms.
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3.
A square loop of side 0.50 m is placed in a uniform magnetic field of 0.4 T perpendicular to the plane of the loop. The loop is rotated through an angle of 60° in 0.2 s. The value of emf induced in the loop will be:
- 5 V
- 3.5 V
- 2.5 V
- Zero V
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4.
Two parallel plate capacitors X and Y are connected in series to a 6 V battery. They have the same plate area and same plate separation but capacitor X has air between its plates, whereas capacitor Y contains a material of dielectric constant 4. Calculate the capacitances of X and Y, if the equivalent capacitance of the combination of X and Y is \( 4 \, \mu\text{F} \). Calculate the potential difference across the plates of X and Y.
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5.
Photoemission of electrons occurs from a metal (\( \phi_0 = 1.96 \, \text{eV} \)) when light of frequency \( 6.4 \times 10^{14} \, \text{Hz} \) is incident on it. Calculate: Energy of a photon in the incident light, The maximum kinetic energy of the emitted electrons, and The stopping potential.
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6.
Write any two features of nuclear forces.
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