List the fundamental quantities along with their units in SI system

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In the International System of Units (SI), the seven fundamental quantities and their respective units are:

Length (meter): It is defined as the length of the path traveled by light in a vacuum during a time interval of 1/299,792,458 of a second. The meter is widely used to measure the size and distance of objects, such as the dimensions of a room, the height of a building, etc.
Mass (kilogram): Mass is a scalar quantity that measures the amount of matter in an object. It is defined as the ratio of force to acceleration, and its unit in the International System of Units (SI) is the kilogram (kg).
Time (second): Time (second) is a fundamental physical quantity that measures the duration of an event. It is used to quantify the change in the state of a system and to describe how physical quantities vary over time. In the International System of Units (SI), the second is the base unit of time and is defined as the duration of 9,192,631,770 periods of radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom.
Electric current (ampere): An electric current is the flow of electric charge in a conductor. The unit of electric current in the International System of Units (SI) is Ampere (A). One Ampere is defined as the flow of one Coulomb of electric charge per second through a conductor. The Ampere is used to quantify the flow of electric charge in circuits, batteries, and other electrical systems.
Thermodynamic temperature (kelvin): Thermodynamic temperature, measured in kelvin (K), is a unit of measurement that refers to the temperature of a system in thermodynamics, based on the size of its thermal energy content. It is a fundamental quantity in physics and defines the temperature scale used in thermodynamics, and is proportional to the average thermal energy of a system's particles. The kelvin is defined as the fraction 1/273.16 of the thermodynamic temperature of the triple point of water and is the base unit of temperature in the International System of Units (SI).
Amount of substance (mole): The mole (mol) is the SI unit of measurement for the amount of a substance in a chemical reaction or sample. It is defined as the amount of substance that contains the same number of entities as there are in 12 grams of carbon-12, which is the most common isotope of carbon. The mole is a very large number and is used to describe large quantities of a substance, such as the number of atoms, ions, or molecules in a sample. The mole is a convenient and widely used unit in chemical calculations and is essential for accurately quantifying chemical reactions.
Luminous intensity (candela): Luminous intensity (candela) is the standard unit of measurement for the luminous power of a source of light in the International System of Units (SI). It is defined as the amount of light emitted by a source in a particular direction, and is proportional to the power of the source. A candela is a luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 10^12 Hz and that has a radiant intensity in that direction of 1/683 watt per steradian.

Units and Measurements Video Lecture

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Important Related Topics
Branches of Physics	Value Constants	System of Unit
Fundamental forces in nature	Measurement of length	Measurement of mass
Definition of Micrometer	Screw Gauge Measurement	Dimensional Analysis
Uses of vernier calipers	Conservation Laws in Physics	Fundamental and Derived Units

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) $

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2.
Two point charges -Q and Q are located at points (d, 0) and (0, d) respectively, in x-y plane. The electric field E at the origin will be:

$\frac{1}{4\pi\epsilon_0} \frac{\sqrt{2}Q}{d^2} (\hat{i} - \hat{j})$
$\frac{1}{4\pi\epsilon_0} \frac{\sqrt{2}Q}{d^2} (-\hat{i} - \hat{j})$
$\frac{1}{4\pi\epsilon_0} \frac{Q}{d^2} (\hat{i} - \hat{j})$
$\frac{1}{4\pi\epsilon_0} \frac{Q}{d^2} (-\hat{i} - \hat{j})$

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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 $60^\circ$ 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.
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.

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5.
The number of free electrons per unit volume ($\text{m}^3$) in a wire made of copper (resistivity $1.72 \times 10^{-8}\,\Omega\,\text{m}$) is $8.5 \times 10^{28}$. Calculate the average number of collisions made by an electron in one second when an electric field is maintained in the wire.

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6.
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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List the fundamental quantities along with their units in SI system

Units and Measurements Video Lecture

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?

2.
Two point charges -Q and Q are located at points (d, 0) and (0, d) respectively, in x-y plane. The electric field E at the origin will be:

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 $60^\circ$ in 0.2 s. The value of emf induced in the loop will be:

5.
The number of free electrons per unit volume ($\text{m}^3$) in a wire made of copper (resistivity $1.72 \times 10^{-8}\,\Omega\,\text{m}$) is $8.5 \times 10^{28}$. Calculate the average number of collisions made by an electron in one second when an electric field is maintained in the wire.

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List the fundamental quantities along with their units in SI system

Units and Measurements Video Lecture

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?

2.Two point charges -Q and Q are located at points (d, 0) and (0, d) respectively, in x-y plane. The electric field E at the origin will be:

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 $60^\circ$ in 0.2 s. The value of emf induced in the loop will be:

5.The number of free electrons per unit volume ($\text{m}^3$) in a wire made of copper (resistivity $1.72 \times 10^{-8}\,\Omega\,\text{m}$) is $8.5 \times 10^{28}$. Calculate the average number of collisions made by an electron in one second when an electric field is maintained in the wire.

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?

2.
Two point charges -Q and Q are located at points (d, 0) and (0, d) respectively, in x-y plane. The electric field E at the origin will be:

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 $60^\circ$ in 0.2 s. The value of emf induced in the loop will be:

5.
The number of free electrons per unit volume ($\text{m}^3$) in a wire made of copper (resistivity $1.72 \times 10^{-8}\,\Omega\,\text{m}$) is $8.5 \times 10^{28}$. Calculate the average number of collisions made by an electron in one second when an electric field is maintained in the wire.