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 question posted

6 months ago

Class 12th Inverse Trigonometric Functions

Let A = ${Z \in C : | \frac{z + 1}{z - 1} | < 1}$ and B = ${z \in C : a r g (\frac{z - 1}{z + 1}) = \frac{2 π}{3}} .$ Then $A \cup B$ is

0 Follower 4 Views

New question posted

6 months ago

Class 12th Inverse Trigonometric Functions

Let A = ${Z \in C : | \frac{z + 1}{z - 1} | < 1}$ and B = ${z \in C : a r g (\frac{z - 1}{z + 1}) = \frac{2 π}{3}} .$ Then $A \cup B$ is

0 Follower 2 Views

New answer posted

6 months ago

Class 12th Maths Matrices

Let f(x) = $\frac{x - 1}{x + 1}, x \in R - {0, - 1, 1} .$ If $f^{n + 1} (x) = f (f^{n} (x)) f o r a l l n \in N,$ then f⁶ (6) + f⁷ (7) is equal a to

0 Follower 9 Views

Payal Gupta

Contributor-Level 10

$f (x) = \frac{x - 1}{x + 1} \Rightarrow f (f (x)) = \frac{\frac{x - 1}{x + 1} - 1}{\frac{x - 1}{x + 1} + 1} = - \frac{1}{x}$

$f^{3} (x) = - \frac{x + 1}{x - 1} \Rightarrow f^{4} (x) = \frac{\frac{x - 1}{x + 1} + 1}{\frac{x - 1}{x + 1} - 1} = x$

$S o, f^{6} (6) + f^{7} (7) = f^{2} (6) + f^{3} (7)$

= $- \frac{1}{6} - \frac{7 + 1}{7 - 1} = - \frac{9}{6} = - \frac{3}{2}$

0 0

New answer posted

6 months ago

Class 12th Physics Wave Optics

A liquid of density 750 kgm^-3 flows smoothly through a horizontal pipe that tapers in cross-sectional area from A₁ = 1.2 * 10^-2m² to A₂ = $\frac{A_{1}}{2} .$ The pressure difference between the wide and narrow sections of the pipe is 4500 Pa. The rate of flow of liquid is_________ * 10^-3m³s^-1.

0 Follower 6 Views

alok kumar singh

Contributor-Level 10

Given A₂ = $\frac{A_{1}}{2}$

Bernoulli's b/w (1) & (2)

$\frac{P_{1}}{ρ g} + \frac{v_{1}^{2}}{2 g} + z_{1} = \frac{ρ_{2}}{ρ g} + \frac{v_{2}^{2}}{2 g} + z_{2}$

z₁ = z₂]

$\frac{P_{1} - P_{2}}{ρ g} = \frac{v_{2}^{2} - v_{1}^{2}}{2 g}$

[Q = A₁V₁ = A₂V₂]

$\frac{4500}{750} = \frac{{(\frac{Q}{A_{2}})}^{2}}{2} - {(\frac{Q}{A_{1}})}^{2}$

$12 = Q^{2} [\frac{1}{A_{2}^{2}} - \frac{1}{A_{1}^{2}}]$

$Q = 2 A_{1} = 2 * 1.2 * 1 0^{- 2}$

= 2.4 * 10^-2 m³ /sec

= 24 * 10^-3 m³ /sec

= 24

0 0

New answer posted

6 months ago

Class 12th Units and Measurement

A uniform disc with mass M = 4 kg and radius R = 10 cm is mounted on a fixed horizontal axle as shown in figure. A block with mass m = 2kg hangs from a massless cord that is wrapped around the rim of the disc. During the fall of the block, the cord does not slip and there is no friction at the axle. The tension in the cord is_________ N.

0 Follower 9 Views

alok kumar singh

Contributor-Level 10

NLM² for (1)

mg – T = ma

Þ 2 * 10 – T = 2a

Þ T + 2a = 20 - (1)

Rotation equestion for (2)

T * R = I_cma

Þ T R = $I_{C M} \frac{a}{R}$

$[α = \frac{a}{R}, N o s l i p p i n g c o n d i t i o n]$

T = $\frac{M a}{2}$

$T = \frac{4}{2} a$

T = 2a - (2)

from (1) & (2)

2T = 20

T = 10N

0 0

New answer posted

6 months ago

Class 12th Nuclei

0 Follower 4 Views

alok kumar singh

Contributor-Level 10

Given A₂ = $\frac{_{}}{}$ $\frac{A_{1}}{2}$

Bernoulli's b/w (1) & (2)

$\frac{P_{1}}{ρ g} + \frac{v_{1}^{2}}{2 g} + z_{1} = \frac{ρ_{2}}{ρ g} + \frac{v_{2}^{2}}{2 g} + z_{2}$

[z₁= z₂]

$\frac{P_{1} - P_{2}}{ρ g} = \frac{v_{2}^{2} - v_{1}^{2}}{2 g}$

[Q = A₁V₁ = A₂V₂]

$\frac{4500}{750} = \frac{{(\frac{Q}{A_{2}})}^{2}}{2} - {(\frac{Q}{A_{1}})}^{2}$

$12 = Q^{2} [\frac{1}{A_{2}^{2}} - \frac{1}{A_{1}^{2}}]$

$Q = 2 A_{1} = 2 * 1.2 * 1 0^{- 2}$

= 2.4 * 10^-2 m³ /sec

= 24 * 10^-3 m³ /sec

= 24

0 0

New answer posted

6 months ago

Class 12th Physics

A running fork of frequency 340 Hz resonates in the fundamental mode with a air column of length 125cm in a cylindrical tube closed at one end. When water is slowly poured in it, the minimum height of water required for observing resonance once again is __________cm.

(Velocity of sound in air is 340 ms^-1)

0 Follower 3 Views

alok kumar singh

Contributor-Level 10

First resonating length = $λ = \frac{V}{f} = \frac{340}{340} = 1 m$ $\frac{}{}$

Second resonating length = $\frac{3 λ}{4} = 75 c m$ $\frac{}{}$

Third resonating length = $\frac{5 λ}{4} = 125 c m$ $\frac{}{}$

Height of water required = 125 – 75 = 50cm

0 0

View All 2 Answers

New question posted

6 months ago

Class 12th Engineering

I completed class 12th with Arts + ITI with engineering trade. Which courses am I eligible for?

0 Follower 4 Views

New question posted

6 months ago

Class 12th Deenbandhu Mahavidyalay

Kya mujhe B.Sc me Deenbandhu Mahavidyalaya me admission milega agr mere class 12th me 61.2% hai?

0 Follower 3 Views

New answer posted

6 months ago

Class 12th Physics

A capacitor C₁ of capacitance $5 μ F$ is charged to a potential of 30V using a battery. The battery is then removed and the charged capacitor is connected to an uncharged capacitor C₂ of capacitance $10 μ F$ as shown in figure. When the switch is closed charge flows between the capacitors. At equilibrium, the charge on the capacitor C₂ is__________ $μ C .$

0 Follower 6 Views

alok kumar singh

Contributor-Level 10

Q = C₁v

...more

Q = C₁v

= 5 * 30

Q = 150 $μ c$

Now it is connected to an unchanged capacitor C₂

Let change on C₁ ® q₁

& 4 C₂ ® q₂

Apply kvL

$\frac{q_{1}}{q} - \frac{q_{2}}{C_{2}} = 0$

Þ q₂ = 2q₁ – (1)

& conservation of change

q₁ + q₂ = 150 – (2)

Þ from (1) & (2)

3q₁ = 150

q₁ = 50 $μ c$

$q_{2} = 100 μ c$

$q_{2} = 100 μ c o n c_{2}$

less

0 0

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
681k 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