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Question 1581
StructuredStandard5 marks
CBSE Class 11 Mathematics · Conic Sections · Hyperbolas

A hyperbola has vertices (±7,0) and eccentricity \(\frac{4}{3}\). Find its equation.

Question 1582
StructuredStandard5 marks
CBSE Class 11 Mathematics · Straight Lines · Distance and intersections

Measure from (1,2), along 2x−y=0, the distance to 4x+7y+5=0.

Question 1583
StructuredStandard5 marks
CBSE Class 11 Mathematics · Sequences and Series · Special series and applications

A letter chain sends four copies at each stage. At ₹0.50 per letter, calculate the total postage through the mailing of the eighth set.

Question 1584
StructuredStandard6 marks
CBSE Class 11 Chemistry · Equilibrium · Buffer, salt hydrolysis and solubility equilibria

The ionization constant of nitrous acid is 4.5 × 10–4. Determine

(a)
the pH of 0.04 M sodium nitrite solution
(b)
also its degree of hydrolysis.
Question 1585
StructuredStandard4 marks
CBSE Class 11 Chemistry · Structure of Atom · Matter waves and uncertainty principle

An electron's position is measured to ±0.002 nm. Calculate the minimum momentum uncertainty. Explain whether a proposed momentum smaller than this uncertainty can be meaningfully specified.

Question 1586
StructuredStandard5 marks
CBSE Class 11 Mathematics · Trigonometric Functions · Multiple and half angles

If tan x=−\(\frac{4}{3}\) and x is in quadrant II, find sin(\(\frac{x}{2}\)), cos(\(\frac{x}{2}\)) and tan(\(\frac{x}{2}\)).

Question 1587
StructuredStandard5 marks
CBSE Class 11 Mathematics · Limits and Derivatives · Rules of differentiation

Differentiate sin(nx).

Question 1588
StructuredStandard5 marks
CBSE Class 11 Mathematics · Conic Sections · Hyperbolas

A hyperbola has foci (0,±√10) and contains (2,3). Find its equation.

Question 1589
StructuredStandard5 marks
CBSE Class 11 Mathematics · Straight Lines · Distance and intersections

Through (−1,2), determine every direction whose intersection with x+y=4 is exactly 3 units away.

Question 1590
StructuredStandard5 marks
CBSE Class 11 Mathematics · Sequences and Series · Special series and applications

₹10,000 is deposited at 5% simple interest per year. Find

(a)
the balance at the end of year 15
(b)
at the end of year 20.