Aim To determine the focal length of a convex lens by obtaining the image of a distant object. Apparatus Required Theory For an object placed at infinity (practically a distant object), the image formed by a convex lens lies at the focus F of the convex lens. Distance between the optical centre O and the […]
Aim To determine the focal length of a concave mirror by obtaining the image of a distant object. Apparatus Required Theory Procedure Observations S. No. Name of the object Distance between mirror and screen(Focal length) 1. Pole f1 = 29.8 cm 2. Tree 1 f2 = 30 cm 3. Tree 2 f3 = 30 cm […]
Aim To study the dependence of current (I) on the potential difference (V) across a resistor and determine its resistance. Also plot a graph between V and I. Materials Required Battery eliminator Ammeter Voltmeter Rheostat One way plug key Resistor Connecting wires Theory Ohm’s Law: At constant temperature, the potential difference (V) across a conductor […]
Coordinate Geometry – Important Questions Find a relation between x and y such that the point (x , y) is equidistant from the points (7, 1) and (3, 5). Find the distance between the following pairs of points : (2, 3), (4, 1) (-6, 2), (-4, -3) (7, 6), (2, 1) (4, -3), (2, -8) […]
Statistics – Previous Years Questions The mean and median of a distribution are 14 and 15 respectively. The value of mode is 16 17 18 13 [1 Mark] [CBSE 2020] 2. Find the mode of the following distribution: [2 Marks] [CBSE 2020] Classes: 0-20 20-40 40-60 60-80 80-100 Frequency: 10 8 12 16 4 3. […]
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 […]
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 […]
Surface Areas And Volumes – Previous Years Questions A spherical metal ball of radius 8 cm is melted to make 8 smaller identical balls. The radius of each new ball is __________cm. [CBSE 2020] [1 Mark] Find the perimeter of a protector if its diameter is 21 cm. (Use π = 22/7) [CBSE 2017] [2 […]
Area Related To Circles – Previous Years Questions In the given figure, O is the centre of a circle such that diameter AB = 13 cm and AC = 12 cm. BC is joined. Find the area of the shaded region. (Take π = 3.14) [CBSE 2016] [3 Marks] In the given figure, find the […]
Circles Important Questions How many tangents can a circle have? In two concentric circles, a chord of the larger circle touches the smaller circle. If the length of this chord is 8 cm and the diameter of the smaller circle is 6 cm, then find the diameter of the larger circle. Draw a circle and […]