Q1. The water in an open pond remains cool even in hot summer because (a) Of continuous evaporation of water (b) Water radiates heat more rapidly than the atmosphere (c) Water absorbs heat less rapidly than the atmosphere (d) Water absorbs heat more rapidly than the atmosphere (UPSC Prelims 1979) Answer: (c) Water absorbs heat …
Q1. The Vitamin responsible for anti-sterile activity is (a) Vitamin A (b) Vitamin B (c) Vitamin C (d) Vitamin D (UPSC Prelims 1979) Answer: (c) Vitamin C Explanation: Vitamin C plays a key role in cellular health, tissue repair, and immune function. Its antioxidant properties help prevent sterility-related conditions by maintaining reproductive tissue integrity and …
Q1. The content of water is greater than fats, the plasma is more than proteins, proteins are more than fats and fats less than plasma. Which constitutes the major Part of the human body ? (a) Fats (b) Water (c) Plasma (d) Proteins (UPSC Prelims, 1979) Answer: (b) Water Explanation: The human body is composed …
Q1. Gobar gas contains mainly (a) Carbon dioxide (b) Methane (c) Ethylene (d) Carbon monoxide (UPSC Prelims 1979) Answer: (b) Methane Explanation: Gobar gas, produced from the anaerobic decomposition of cow dung, primarily consists of methane, which is a combustible gas. It is used as a renewable source of energy for cooking and lighting. The …
Q1. The first metal used by the man was (a) Iron (b) Copper (c) Aluminium (d) Gold (UPSC Prelims 1979) Answer: (b) Copper Explanation: Copper was one of the earliest metals discovered and used by humans, primarily because it occurs in native form and can be easily extracted and shaped. Its low melting point and …
Q1. Solar eclipse occurs when (a) Earth comes between sun and moon (b) Moon is at right angle to the earth (c) Moon comes between sun and earth (d) Sun comes between moon and earth (UPSC Prelims 1979) Answer: (c) Moon comes between sun and earth Explanation: A solar eclipse takes place when the Moon …
1. Sets Before studying relations and functions, we must understand sets. A set is a well-defined collection of distinct objects. Example: If \( A = \{1, 2, 3\} \), then the elements of set \(A\) are 1, 2, and 3. 2. Cartesian Product of Sets If \(A\) and \(B\) are two non-empty sets, then …
Polynomials – Class 9 Mathematics Polynomials are one of the most important topics in Class 9 Mathematics. They are widely used in algebra, geometry, and higher-level mathematics. In this blog, we will understand what polynomials are, their types, degrees, and solve examples step by step. 1. What is a Polynomial? An algebraic expression that contains …
Number System – Class 9 Mathematics The Number System forms the foundation for algebra, geometry, and higher mathematics. In this blog, we will understand different types of numbers in a simple and clear manner. 1. What is a Number System? A number system is a way of representing numbers and classifying them based on their …
The Laws of Motion were formulated by Sir Isaac Newton in the year 1687. They describe how and why objects move. These laws form the foundation of classical mechanics. 1. Newton’s First Law of Motion (Law of Inertia) Statement: An object remains in its state of rest or of uniform motion in a straight line …