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Draw the welllabelled 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
State the laws of refraction of light.
Concept: Refraction of Light Through a Rectangular Glass Slab
State the laws of refraction of light.
Concept: Refraction of Light Through a Rectangular Glass Slab
State the laws of refraction of light.
Concept: Refraction of Light 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
A milk centre sold milk to 50 customers. The table below gives the number of customers and the milk they purchased. Find the mean of the milk sold by direct method.
Milk Sold (Litre)  1 – 2  2 – 3  3 – 4  4 – 5  5 – 6 
No. of Customers  17  13  10  7  3 
Concept: Tabulation of Data
Read the following extract and complete the table given below about 'Types of Diseases':
Health is defined as not simply the absence of disease. It involves a state of feeling well, both in body and in mind.
The diseases may be classified into the following types, Some diseases are present at birth. They are called congenital diseases. They may develop during pregnancy or are inherited, Some of them may be caused by environmental factors. Examples of congenital diseases are Down's syndrome, sickle cell anaemia, cystic fibrosis, haemophilia, etc.
Some diseases are acquired by humans themselves and hence are called SelfInflicted or Acquired diseases. Examples of acquired diseases are coronary heart diseases, hypertension.
Some diseases are transmitted from one person to another. They are called as Communicable or Infectious diseases. They are caused by biological agents, Examples of communicable diseases are Cholera, Typhoid, Measles, Malaria, etc.
Non communicable diseases are caused by exogenous factors like physical, chemical, nutritional deficiencies. The examples are Kwashiorkor, Pellagra, Scurvy, and Rickets, etc.
Title
Sr.No.  Types  Causes 
Examples 
1.  Congenital 
o develop during pregnancy o environmental factors 

2.  SelfInflicted Acquired  Coronary heart disease. hypertension  
3.  By biological agents  Cholera, typhoid, measles, malaria  
4.  Noncommunicable diseases  Kwashiorkor, Pellagra, Scurvy, and Rickets 
Concept: Writing Skill
Prove that "Opposite angles of a cyclic quadrilateral are supplementary".
Concept: Cyclic Quadrilateral
Complete the sentence by choosing the correct option.
The first English newspaper in India was started by _______
Concept: History of Mass Media
Explain sex determination in human beings.
Concept: Sex Determination
If 12x +13y =29 and 13x +12y=21, find x + y.
Concept: Linear Equation in Two Variables
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: Application of Quadratic Equation
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 of a Quadratic Equation
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