NCERT Class 9 Maths Solutions: Linear Equations in Two Variables Question: Which one of the following options is true, and why? y = 3x + 5 has A. a unique solution B. only two solutions C. infinitely many solutions Concept in a Minute: Linear equations in two variables have infinitely many solutions. A linear equation […]

NCERT Class 9 Maths Solutions: Introduction to Euclids Geometry Question: The following statement is true or false? Give reason for your answer. If two circles are equal, then their radii are equal. A. True B. False Concept in a Minute: Definition of equal circles. Explanation: Two circles are defined as equal if they have the

NCERT Class 9 Maths Solutions: Heron’s Formula Question: An isosceles triangle has perimeter 30 cm and each of the equal sides is 12 cm. Find the area of the triangle. Concept in a Minute: To find the area of a triangle when all side lengths are known, Heron’s formula is used. For an isosceles triangle,

NCERT Class 9 Maths Solutions: Coordinate Geometry Question: How will you describe the position of a table lamp on your study table to another person? Concept in a Minute: To describe the position of an object, we need a reference point and a way to measure distance and direction from that reference point. This is

NCERT Class 9 Maths Solutions: Circles Question: If two equal chords of a circle intersect within the circle, prove that the line joining the point of intersection to the centre makes equal angles with the chords. Concept in a Minute: Congruent Triangles: Triangles are congruent if all three corresponding sides and all three corresponding angles

NCERT Class 10 Science Solutions: The Human Eye and the Colourful World Question: The human eye forms the image of an object at its ______. A. cornea B. iris C. pupil D. retina Concept in a Minute: The human eye functions like a camera. Light enters the eye through the pupil and is focused by

NCERT Class 10 Science Solutions: Our Environment Question: Which of the following constitute a food-chain? A. Grass, wheat and mango B. Grass, goat and human C. Goat, cow and elephant D. Grass, fish and goat Concept in a Minute: A food chain shows the flow of energy from one living organism to another. It starts

NCERT Class 10 Science Solutions: Metals and Non-metals Question: An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be: A. calcium B. carbon C. silicon D. iron Concept in a Minute: The question tests the understanding of the

NCERT Class 10 Science Solutions: Magnetic Effects of Electric Current Question: Which of the following correctly describes the magnetic field near a long straight wire? A. The field consists of straight lines perpendicular to the wire B. The field consists of straight lines parallel to the wire C. The field consists of radial lines originating

NCERT Class 10 Science Solutions: Light – Reflection and Refraction Question: Which one of the following materials cannot be used to make a lens? A. Water B. Glass C. Plastic D. Clay Concept in a Minute: To form a lens, a material must be transparent and have a refractive index different from the surrounding medium