# Class 10 – Probability – Important Questions

Probability – Important Questions A box contains 90 discs, numbered from 1 to 90. If 1 disc is drawn at random from the box, the probability that it bears a prime number less than 23, is : 7/90 10/90 4/45 9/89 What is the sum of the probabilities of all the elementary events of an […]

# Class 10 – Probability – Previous Years Questions

Probability – Previous Years Questions If two different dice are rolled together, the probability of getting an even number on both dice is 1/36 1/2 1/6 1/4 [CBSE 2014] [1 Mark] A number is selected at random from the numbers 1 to 30. The probability that it is a prime number is 2/3 1/6 1/3 […]

# Class 10 – Constructions – Previous Years Questions

Constructions – Previous Years Questions Draw a circle of radius 5 cm. Construct a pair of tangents to it so that they are inclined at 60°. Measure the lengths of the two tangents. [CBSE 2017] [3 Marks] Construct a triangle with sides 5 cm, 6 cm and 7 cm. Now construct another triangle whose sides […]

# Class 10 – Circles – Previous Years Questions

Circles – Previous Years Questions In the given figure PQ is a tangent at a point C to a circle with centre O. If AB is a diameter and ∠CAB = 30°. Find ∠PCA. [CBSE 2016] [1 Mark] Two concentric circles of radii a and b (a > b) are given. Find the length of […]

# Class 10 Some Applications of Trigonometry Previous Years Questions

Some Applications of Trigonometry – Previous Years Questions A ladder, leaning against a wall, makes an angle of 60° with the horizontal. If the foot of the ladder is 2.5 m away from the wall, find the length of the ladder. [CBSE 2016] [1 Mark] If the shadow of a vertical pole at a particular […]

# Class 10 Arithmetic Progressions Previous Years Questions

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] […]

# Class 10 – Quadratic Equations – Previous Years Questions

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] […]

# Class 10 – Pair of Linear Equations in Two Variables – Previous Years Questions

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 […]

# Class 10 Control and Coordination Notes

Control and Coordination Notes Stimulus:- The change in the environment to which an organism response 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 […]

# Class 10 Periodic Classification of Elements Important Questions

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 […]