Tags Class 12th

Class 12th

Get insights from 12k questions on Class 12th, answered by students, alumni, and experts. You may also ask and answer any question you like about Class 12th

Follow Ask Question

12k

Questions

Discussions

Active Users

Followers

New answer posted

6 months ago

Class 12th Maths NCERT Exemplar Solutions Class 12th Chapter Three

If $A$ and $B$ are two matrices of the same order, then $A - B = B - A$

0 Follower 2 Views

Payal Gupta

Contributor-Level 10

This is a True or False Type Questions as classified in NCERT Exemplar

$\begin{array}{l} F a l s e . \\ Since s u b t r a c t i o n s o f a n y t w o m a t r i c e s o f t h e s a m e o r d e r i s n o t c o m m u t a t i v e i . e ., A - B \neq B - A \end{array}$

0 0

New answer posted

6 months ago

Class 12th Maths NCERT Exemplar Solutions Class 12th Chapter Three

If $A$ and $B$ are two square matrices of the same order, then $A + B = B + A$ .

0 Follower 2 Views

Payal Gupta

Contributor-Level 10

This is a True or False Type Questions as classified in NCERT Exemplar

$\begin{array}{l} T r u e . \\ I f A a n d B a r e s q u a r e m a t r i c e s o f t h e n t h e i r a d d i t i o n i s c o m m u t a t i v e i . e ., A + B = B + A \end{array}$

0 0

New answer posted

6 months ago

Class 12th Physics NCERT Exemplar Solutions Class 12th Chapter Seven

Two light beams of intensities 4I and 9I interfere on a screen. The phase difference between these beams on the screen at point A is zero and at point B is . The difference of resultant intensities, at the point A and B, will be_________I.

0 Follower 2 Views

Vishal Baghel

Contributor-Level 10

$I_{A} = 9 l + 4 l + 2 \sqrt[]{9 l * 4 l} c o s 0 °$

$= 13 l + 12 l = 25 l$

$I_{B} = 9 l + 4 l + 2 \sqrt[]{9 l * 4 l} c o s π$

$= 13 l - 12 l = l$

$∴ I_{A} - I_{B} = 24 l$

0 0

New answer posted

6 months ago

Class 12th Physics NCERT Exemplar Solutions Class 12th Chapter Nine

A closely wounded circular coil of radius 5cm produces a magnetic field of 37.68 * 104 T at its centre. The current through the coil is_ A. [Given, number of turns in the coil is 100 and = 3.14]

0 Follower 3 Views

Vishal Baghel

Contributor-Level 10

$B_{c e n t r e} = N \frac{μ_{0} i}{2 r}$

$\Rightarrow \frac{100 * 4 π * 1 0^{- 7} * i}{2 * 5 * 1 0^{- 2}} = 37.68 * 1 0^{- 4}$

$∴ i = \frac{37.68}{4 * 3.14} = 3 A$

0 0

New answer posted

6 months ago

Class 12th Physics NCERT Exemplar Solutions Class 12th Chapter Fifteen

The current I flowing through the given circuit will be_________A.

0 Follower 4 Views

Vishal Baghel

Contributor-Level 10

$i = \frac{v}{R_{N e t}} = \frac{6}{3} = 2 A$

0 0

New answer posted

6 months ago

Class 12th Maths NCERT Exemplar Solutions Class 12th Chapter Three

Two matrices are equal if they have the same number of rows and the same number of columns.

0 Follower 2 Views

Payal Gupta

Contributor-Level 10

This is a True or False Type Questions as classified in NCERT Exemplar

$\begin{array}{l} F a l s e . \\ T h e t w o m a t r i c e s a r e s a i d t o b e e q u a l i f t h e i r c o r r e s p o n d i n g e l e m e n t s a r e s a m e . \end{array}$

0 0

New answer posted

6 months ago

Class 12th Physics NCERT Exemplar Solutions Class 12th Chapter Ten

One mole of a monoatomic gas is mixed with three moles of a diatomic gas. The molecular specific heat of mixture of constant volume is $\frac{α^{2}}{4} R J / m o l K;$ then the value of will be________.

(Assume that the given diatomic gas has no vibrational mode.)

0 Follower 2 Views

Vishal Baghel

Contributor-Level 10

$C_{v} = \frac{α^{2} R}{4} J / m o l^{- k}$

As, Cv (mix) = $\frac{1 * \frac{3}{2} R + 3 * \frac{5}{2} R}{4} = \frac{9 R}{4} = \frac{α^{2} R}{4}$

$∴ α = 3$

0 0

New answer posted

6 months ago

Class 12th Physics NCERT Exemplar Solutions Class 12th Chapter Nine

The pressure P1 and density d1 of diatomic gas $(γ = \frac{7}{5})$ changes suddenly to P2(>P1) and d2 respectively during an adiabatic process. The temperature of the gas increases and becomes ________times of its initial temperature. (given $\frac{d_{2}}{d_{1}} = 32)$

0 Follower 3 Views

Vishal Baghel

Contributor-Level 10

For adiabatic process – PVY = const

$T_{1} {V_{1}}^{Y - 1} = T_{2} V_{2}^{Y - 1}$

$\frac{T_{2}}{T_{1}} = {(\frac{v_{1}}{v_{2}})}^{Y - 1} = {(\frac{d_{2}}{d_{1}})}^{Y - 1} = {(32)}^{(\frac{7}{5} - 1)} = {(32)}^{2 / 5}$

$= {(2)}^{2} = 4$

0 0

New answer posted

6 months ago

Class 12th Maths NCERT Exemplar Solutions Class 12th Chapter Three

A square matrix where every element is unity is called an identity matrix.

0 Follower 2 Views

Payal Gupta

Contributor-Level 10

This is a True or False Type Questions as classified in NCERT Exemplar

$\begin{array}{l} F a l s e . \\ Since, i n a n i d e n t i t y m a t r i x a l l t h e e l e m e n t s o f p r i n c i p a l d i a g o n a l a r e u n i t y r e s t a r e z e r o . \\ e . g ., A = [\begin{matrix} 1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1 \end{matrix}] = I_{3} \end{array}$

0 0

New question posted

6 months ago

Class 12th Physics NCERT Exemplar Solutions Class 12th Chapter Nine

0 Follower

Get authentic answers from experts, students and alumni that you won't find anywhere else

On Shiksha, get access to

66k Colleges
1.2k Exams
684k Reviews
1800k Answers

Community GuidelinesUser Points System

QuestionsDiscussionsTags

Need guidance on career and education? Ask our experts

Your Question

Class 12th

Questions

Discussions

Active Users

Followers

All

Discussions

Unanswered Questions

Share Your College Life Experience