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.
Suppose a pure Si crystal has \( 5 \times 10^{28} \) atoms per \( \text{m}^3 \). It is doped with \( 5 \times 10^{22} \) atoms per \( \text{m}^3 \) of Arsenic. Calculate majority and minority carrier concentration in the doped silicon. (Given: \( n_i = 1.5 \times 10^{16} \, \text{m}^{-3} \))
View Solution
2.
Draw a circuit diagram of a full-wave rectifier using p-n junction diodes. Explain its working and show the input-output waveforms.
View Solution
3.
A tank is filled with a liquid to a height of \( 12.5 \, \text{m} \). The apparent depth of a needle lying at the bottom of the tank is measured to be \( 9.0 \, \text{m} \). Calculate the speed of light in the liquid.
View Solution
4.
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.
View Solution
5.
Write any two features of nuclear forces.
View Solution
6.
Two small identical metallic balls having charges \( q \) and \( -2q \) are kept far at a separation \( r \). They are brought in contact and then separated at distance \( \frac{r}{2} \). Compared to the initial force \( F \), they will now:
- attract with a force \( \frac{F}{2} \)
- repel with a force \( \frac{F}{2} \)
- repel with a force \( F \)
- attract with a force \( F \)
View Solution

View All

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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.
Suppose a pure Si crystal has \( 5 \times 10^{28} \) atoms per \( \text{m}^3 \). It is doped with \( 5 \times 10^{22} \) atoms per \( \text{m}^3 \) of Arsenic. Calculate majority and minority carrier concentration in the doped silicon. (Given: \( n_i = 1.5 \times 10^{16} \, \text{m}^{-3} \))

2.
Draw a circuit diagram of a full-wave rectifier using p-n junction diodes. Explain its working and show the input-output waveforms.

3.
A tank is filled with a liquid to a height of \( 12.5 \, \text{m} \). The apparent depth of a needle lying at the bottom of the tank is measured to be \( 9.0 \, \text{m} \). Calculate the speed of light in the liquid.

4.
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.

5.
Write any two features of nuclear forces.

6.
Two small identical metallic balls having charges \( q \) and \( -2q \) are kept far at a separation \( r \). They are brought in contact and then separated at distance \( \frac{r}{2} \). Compared to the initial force \( F \), they will now:

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

1.Suppose a pure Si crystal has \( 5 \times 10^{28} \) atoms per \( \text{m}^3 \). It is doped with \( 5 \times 10^{22} \) atoms per \( \text{m}^3 \) of Arsenic. Calculate majority and minority carrier concentration in the doped silicon. (Given: \( n_i = 1.5 \times 10^{16} \, \text{m}^{-3} \))

2.Draw a circuit diagram of a full-wave rectifier using p-n junction diodes. Explain its working and show the input-output waveforms.

3.A tank is filled with a liquid to a height of \( 12.5 \, \text{m} \). The apparent depth of a needle lying at the bottom of the tank is measured to be \( 9.0 \, \text{m} \). Calculate the speed of light in the liquid.

4.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.

5. Write any two features of nuclear forces.

6.Two small identical metallic balls having charges \( q \) and \( -2q \) are kept far at a separation \( r \). They are brought in contact and then separated at distance \( \frac{r}{2} \). Compared to the initial force \( F \), they will now:

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
Suppose a pure Si crystal has \( 5 \times 10^{28} \) atoms per \( \text{m}^3 \). It is doped with \( 5 \times 10^{22} \) atoms per \( \text{m}^3 \) of Arsenic. Calculate majority and minority carrier concentration in the doped silicon. (Given: \( n_i = 1.5 \times 10^{16} \, \text{m}^{-3} \))

2.
Draw a circuit diagram of a full-wave rectifier using p-n junction diodes. Explain its working and show the input-output waveforms.

3.
A tank is filled with a liquid to a height of \( 12.5 \, \text{m} \). The apparent depth of a needle lying at the bottom of the tank is measured to be \( 9.0 \, \text{m} \). Calculate the speed of light in the liquid.

4.
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.

5.
Write any two features of nuclear forces.

6.
Two small identical metallic balls having charges \( q \) and \( -2q \) are kept far at a separation \( r \). They are brought in contact and then separated at distance \( \frac{r}{2} \). Compared to the initial force \( F \), they will now: