Arithmetic Progressions Previous Years Questions For what value of k will k + 9, 2k – 1 and 2k + 7 are the consecutive terms of an A.P. ? [CBSE 2016] [1 Mark] In an AP, if the common difference is -4 and the seventh term is 4, then find the first term. [CBSE 2018] […]
Quadratic Equations – Previous Years Questions The quadratic equation x2 – 4x + k = 0 has distinct real roots if k = 4 k > 4 k = 16 k < 4 [CBSE 2020] [1 Mark] Write the discriminant of the quadratic equation (x + 5)2 = 2(5x – 3). [CBSE 2019] [1 Mark] […]
Pair of Linear Equations in Two Variables – Previous Years Questions The pair of linear equations y = 0 and y = -6 has a unique solution no solution infinitely many solution only solution (0,0) [CBSE 2020] [1 Mark] Solve the following pair of linear equations:3x – 5y = 42y + 7 = 9x [CBSE […]
Control and Coordination Notes Stimulus:- The change in the environment to which an organism respond and react is called stimulus. Receptors:- The group of cells present in sense organs which are sensitive to change in environment are called receptors. There are five types of receptors:- Gustatory receptor Olfactory receptor Photo receptor Phono receptor Thermo receptor […]
Periodic Classification of Elements Important Questions “Atomic number of an element is considered to be a more appropriate parameter than its atomic mass for a chemist.” Take the example of element X (atomic number 13) to justify this statement. How many triads did Dobereiner identify from the existing elements during his time ? Give an […]
Periodic Classification of Elements Notes Döbereiner’s triads:- Dobereiner arranged elements with similar properties into groups having three elements each and called those groups triads.When the three elements in a triad were written in the order of increasing atomic masses, the atomic mass of middle element was roughly equal to the average atomic masses of other […]
Carbon and its Compounds Previous Years Questions Assertion (A) : Melting point and boiling point of ethanol are lower than that of sodium chloride. Reason (R) : The force of attraction between the molecules of ionic compounds are very strong. Answer the question selecting appropriate options given below : a. Both Assertion (A) and Reason […]
Carbon and its Compounds Important Questions a. Complete the following equations:-b. Write the name of the following:-i. CH3CH2COOHii. CH3CH2Brc. Draw the electron dot structure of ethene (C2H4). a. Name the compound CH3CH2OH and identity its functional group.b. Give a chemical test to distinguish between ethanol and ethanoic acid.c. Name the product formed when an organic […]
Polynomials Important Questions If one of the zeroes of the cubic polynomial x3 + ax2 + bx + c is -1, then the product of other two zeroes is b – a + 1 b – a – 1 a – b + 1 a – b – 1 Find a quadratic polynomial, the sum […]
Polynomials Previous Years Questions The number of zeroes for a polynomial p(x) where graph of y = p(x) is given in figure is- 3 4 0 5 [CBSE 2020] [1 Mark] If x = 3 is one root of the quadratic equation x2 – 2kx – 6 = 0, then find the value of k. […]