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Draw the well-labelled diagram of the human excretory system

Concept: Excretion: Substances to Be Eliminated

Principle of Electric motor

Concept: Electric Motor

Principle of Electric motor

Concept: Electric Motor

Why does the sun appear reddish early in the morning? Will this phenomenon be observed by an observer on the moon? Justify your answer with a reason.

Concept: Some Natural Phenomena Due to Sunlight

State the laws of refraction of light.

Concept: Refraction of Light > Refraction Through a Rectangular Glass Slab

A three digit number is equal to 17 times the sum of its digits. If 198 is added to the number, the digits are interchanged. The addition of first and third digit is 1 less than middle digit. Find the number.

Concept: Algebraic Methods of Solving a Pair of Linear Equations > Substitution Method

Solve the following quadratic equation for x: `4x^2 + 4bx – (a^2 – b^2) = 0`

Concept: Solutions of Quadratic Equations by Completing the Square

Explain sex determination in human beings.

Concept: Sex Determination in Humans

If 12x +13y =29 and 13x +12y=21, find x + y.

Concept: Linear Equations in Two Variables Applications

Write the quadratic equation whose roots are ‒2 and ‒3.

Concept: Quadratic Equations

The divisor and quotient of the number 6123 are same and the remainder is half the divisor. Find the divisor.

Concept: Quadratic Equations Examples and Solutions

If α + β = 5 and α^{3} +β^{3} = 35, find the quadratic equation whose roots are α and β.

Concept: Quadratic Equations

If the quadratic equation px^{2} − 2√5px + 15 = 0 has two equal roots then find the value of p.

Concept: Nature of Roots

Write the first two terms of the sequence whose nth term is t_{n} = 3n ‒ 4.

Concept: Arithmetic Progression

The 11^{th} term and the 21^{st} term of an A.P. are 16 and 29 respectively, then find:

(a) The first term and common difference

(b) The 34^{th} term

(c) ‘n’ such that t_{n} = 55

Concept: Arithmetic Progression

How many three digit natural numbers are divisible by 5?

Concept: Introduction to Sequence

Write the sample space for selecting a day randomly of the week.

Concept: Sample Space

In a certain race, there are three boys A, B, C. The winning probability of A is twice than B and the winning probability of B is twice than C. If P(A) + P(B) + P(C) = 1, then find the probability of win for each boy.

Concept: Basic Ideas of Probability

In a certain race, there are three boys A, B, C. The winning probability of A is twice than B and the winning probability of B is twice than C. If P(A) + P(B) + P(C) = 1, then find the probability of win for each boy.

Concept: Basic Ideas of Probability

Find the class mark of the classes 20-30 and 30-40.

Concept: Basic Ideas of Probability