study 1. What does the term ‘hydrocarbon’ mean? (A) Compounds of carbon and oxygen only (B) Compounds of carbon and hydrogen only (C) Compounds of hydrogen and oxygen only (D) Compounds of carbon, hydrogen, and oxygen Answer Answer: (B) Compounds of carbon and hydrogen only 2. What is the full form of LPG? (A) Light Petroleum … Read more
1. Who synthesised urea from ammonium cyanate in 1828, disproving the ‘vital force’ theory? (A) Berzilius (B) F. Wohler (C) Kolbe (D) Berthelot Answer Answer: (B) F. Wohler 2. Which element possesses the unique property of catenation to form covalent bonds with other atoms of itself? (A) Oxygen (B) Nitrogen (C) Carbon (D) Sulphur Answer … Read more
चार-क्षेत्रीय अर्थव्यवस्था में गुणक विश्लेषण चार-क्षेत्रीय अर्थव्यवस्था में गुणक विश्लेषण (Multiplier Analysis in a Four-Sector Economy) मैक्रोइकॉनॉमिक्स (समष्टि अर्थशास्त्र) में, एक चार-क्षेत्रीय अर्थव्यवस्था को “खुली अर्थव्यवस्था” (Open Economy) कहा जाता है। इसका अर्थ है कि यह अर्थव्यवस्था न केवल अपने देश के भीतर बल्कि बाकी दुनिया के साथ भी व्यापार करती है। इसमें निम्नलिखित चार … Read more
अर्थशास्त्र में गुणांक (Multiplier) – इन्फोग्राफिक जे.एम. कीन्स का सिद्धांत अर्थशास्त्र में गुणांक (Multiplier) कैसे निवेश में एक छोटी सी वृद्धि राष्ट्रीय आय में कई गुना वृद्धि लाती है। 1. अवधारणा (The Concept) गुणांक (K) यह मापता है कि जब किसी अर्थव्यवस्था में नया निवेश (Investment) किया जाता है, तो उसके परिणामस्वरूप कुल राष्ट्रीय आय … Read more
Class 9 English Grammar: Active and Passive Voice Voice refers to the form of a verb that indicates whether the subject of the sentence performs the action or receives the action. Understanding how to convert sentences between Active and Passive voice is essential for the Editing/Omission and Sentence Transformation sections of your exams. The 5 … Read more
CBSE Class 9 English Grammar: Statements (Sentence Structure) A Statement (also called an Assertive or Declarative sentence) is a sentence that states a fact, describes an event, or expresses an opinion. It always ends with a full stop (.). Understanding the rules of statements is crucial for the Sentence Reordering (Jumbled Words) and Omission/Editing sections … Read more
CBSE Class 9 English Grammar: Tenses Tenses indicate the time of an action or event (Present, Past, Future) and the state of that action (Simple, Continuous, Perfect, Perfect Continuous). 1. PRESENT TENSE Actions happening now, habits, or universal truths. A. Simple Present Tense B. Present Continuous Tense C. Present Perfect Tense D. Present Perfect Continuous … Read more
English Grammar: Modals Modals (or Modal Auxiliaries) are special helping verbs used with main verbs to express ideas such as ability, possibility, permission, necessity, obligation, and advice. Key Rules of Modals Before learning individual modals, remember these three golden rules: Usage of Important Modals 1. Can & Could 2. May & Might 3. Will & … Read more
Class 9 English Grammar: Reported Speech Reported Speech (also known as Direct and Indirect Speech) is used to tell someone what another person said. The 5 Golden Rules of Conversion When changing Direct Speech into Indirect Speech, you must make changes in five main areas: 1. Change of Reporting Verb The verb outside the quotation … Read more