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CBSE
Mathematics
Triangle
What is the length $x$ of the line segment CD in the triangle drawn given?

A. 4
B. 5
C. 6
D. 8
CBSE
Mathematics
Perimeter of regular shapes
For a rangoli competition the four participants of the Indira house draw the following rangoli. They drew a regular hexagon of side $8cm$ and then drew 6 equilateral triangles of the same size.

(A). What is the length of each side of the equilateral triangle?

IIT-JEE
Chemistry
Basicity of sulphurous acid and sulphuric acid are
CBSE
Biology
Types of plants
Fallen leaves from trees are useful because they
A) Solve the problem of fuelwood in village households
B) Enrich water quality
C) Enrich soil fertility
D) Beautify landscape
CBSE
Chemistry
Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous \[CuS{O_4}\] and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is(are)correct?
(i) In beakers A and B, exothermic process has occurred.
(ii) In beakers A and B, endothermic process has occurred.
(iii) In beaker C exothermic process has occurred.
(iv) In beaker C endothermic process has occurred.
CBSE
Mathematics
Linear equations in one variable
Solve: \[3(5x + 7) + 5(2x - 11) = 3(8x - 5) - 15\]
CBSE
Mathematics
Division of fractions
Solve the following: $0.4 \div 20$.

CBSE
Mathematics
Solution of quadratic equations
Solve $7{x^2} - 19x - 6 = 0$ .

CBSE
Mathematics
Algebraic expressions
Solve $\left( {4x + 5} \right)\left( {4x - 1} \right)$ .

CBSE
Mathematics
Solution of linear equations
Solve $3(x + 6) + 2(x + 3) = 64$ for the value of $x$ .

CBSE
Mathematics
Trigonometric functions
Solve $\dfrac{{\cot A - 1}}{{2 - {{\sec }^2}A}} = \dfrac{{\cot A}}{{1 + \tan A}}$ .

CBSE
Mathematics
Rational numbers
State true or false? Zero is the smallest rational number.

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