GK: Class 12 General Q&A · Page 36
3,658 free answers on GK (General) for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- GeneralClass 12All
Bleaching Powder Formula
The chemical formula for bleaching powder is Ca(OCl)₂ or more accurately CaCl(OCl)·H₂O, though it's actually a mixed calcium salt rather than a single compound, primarily containing calcium hypochlorite (Ca(OCl)₂), calcium chloride (CaCl₂), and calcium hydroxide (Ca(OH)₂) in varying proportions. The principal active ingredient responsible for bleaching action is calcium hypochlorite. Bleaching powder is produced industrially by passing chlorine gas over slaked lime (calcium hydroxide),
- GeneralClass 12All
Evaluate i 888
This mathematical expression asks to evaluate i^888, where i is the imaginary unit defined as i = √(-1), the fundamental unit of complex numbers satisfying i² = -1. To evaluate powers of i, recognize the cyclic pattern: i¹ = i, i² = -1, i³ = i² × i = -1 × i = -i, i⁴ = i² × i² = (-1)(-1) = 1, i⁵ = i⁴ × i = 1 × i = i, and the pattern repeats every four powers. Therefore, to evaluate i^n for any integer n, divide n by 4 and e
- GeneralClass 12All
TSA of Cone
TSA stands for Total Surface Area of a cone, which is the sum of the curved (lateral) surface area and the base area. The formula is: TSA = πr(r + l) or πr² + πrl, where r is the radius of the circular base and l is the slant height (the distance from the apex/vertex of the cone to any point on the circumference of the base). The slant height l can be calculated using the Pythagorean theorem: l = √(r² + h²), where h is the perpendicular height of the cone (vertic
- GeneralClass 12All
OTP Full Form
OTP stands for One-Time Password, a security authentication mechanism that generates a unique, temporary password valid for only a single login session or transaction, typically expiring within a few minutes (usually 30 seconds to 10 minutes). OTPs provide an additional security layer beyond static passwords, implementing two-factor authentication (2FA) or multi-factor authentication (MFA) to protect against unauthorized access, password theft, and hacking attempts. When you attempt to log in
- GeneralClass 12All
Cos 180
The value of cos 180° (or cos π radians) equals -1. This is a fundamental trigonometric value that students memorize along with other standard angles like 0°, 30°, 45°, 60°, and 90°. Understanding why cos 180° = -1 requires visualizing the unit circle or understanding the cosine function's definition. In the unit circle (a circle with radius 1 centered at origin), the cosine of an angle represents the x-coordinate of the point where the angle's terminal side int
- GeneralClass 12All
How to Eat Chia Seeds
Chia seeds can be eaten in several ways to maximize their nutritional benefits while ensuring proper digestion and absorption. The most common and recommended method is to soak chia seeds in water or liquid for at least 15-30 minutes before consumption—this allows them to absorb liquid (they can absorb up to 10-12 times their weight), forming a gel-like consistency that's easier to digest and helps with hydration. A typical ratio is 1 tablespoon of chia seeds to 3-4 tablespoons of water
- GeneralClass 12All
Which One of the Following is a Chemical Change
A chemical change (also called a chemical reaction) is a process where substances are transformed into new substances with different chemical compositions and properties, involving the breaking and forming of chemical bonds. This differs fundamentally from physical changes where only the form, state, or appearance changes while the chemical composition remains the same. Examples of chemical changes include: burning wood or paper (combustion producing ash, carbon dioxide, water vapor), rusting
- GeneralClass 12All
MNC Full Form
MNC stands for Multinational Corporation (also called Multinational Company), a business organization that operates in multiple countries beyond its home nation, with facilities, assets, or subsidiaries in at least one foreign country and typically a centralized management headquarters in the home country. MNCs are characterized by: operations spanning multiple countries, centralized decision-making with coordination across international units, significant foreign direct investment, global su
- GeneralClass 12All
ADCA Full Form
ADCA stands for Advanced Diploma in Computer Applications, a computer education course designed to provide comprehensive knowledge and practical skills in computer applications, software, programming, and IT fundamentals. Typically lasting 12-24 months depending on the institution and course structure, ADCA covers broader and more advanced topics than basic computer courses like DCA (Diploma in Computer Applications), making it suitable for individuals seeking to enhance their computer profic
- GeneralClass 12All
Why Did Jerome Offer to Pack
This question refers to a famous humorous story "Packing" by Jerome K. Jerome, included in many English textbooks, where the narrator (Jerome) confidently offers to pack for an upcoming trip, believing himself to be an efficient packer, while his friends Harris and George watch. However, Jerome's packing attempt becomes a comedy of errors—he forgets items, must unpack and repack multiple times, steps on butter, packs his tobacco pouch inside already-closed luggage, and generally demonst
- GeneralClass 12All
Tartaric Acid Has a Specific Rotation of 12.0
This statement refers to the optical activity of tartaric acid, a naturally occurring organic acid found in many fruits, particularly grapes, and widely used in food and beverage industries. Specific rotation is a measure of how much a chiral (optically active) substance rotates plane-polarized light when light passes through its solution. The specific rotation value depends on the substance's molecular structure (particularly stereochemistry), concentration, solvent, temperature, and wavelen
- GeneralClass 12All
STD Full Form
STD has multiple meanings depending on context. Most commonly in telecommunications, STD stands for Subscriber Trunk Dialing, the system allowing telephone users to dial long-distance calls directly without operator assistance, using area codes (STD codes) that identify geographic regions. In India, every city and region has a designated STD code (like 011 for Delhi, 022 for Mumbai, 080 for Bangalore), which callers must dial before the local phone number when calling from outside that region
- GeneralClass 12All
Selenophile
A selenophile is a person who loves the moon, finds beauty and peace in moonlight, and feels a special connection or attraction to lunar aesthetics and imagery. The word combines "selene" (Greek goddess of the moon, also the Greek word for moon) and "phile" (lover of, one who has an affinity for). Selenophiles might enjoy moon-gazing, find calm in moonlit nights, appreciate lunar photography, collect moon-related art or items, or simply feel drawn to the moon's serene presence and symbolic me
- GeneralClass 12All
Dr Rajendra Prasad
Dr. Rajendra Prasad (1884-1963) was a prominent Indian independence movement leader, accomplished lawyer, scholar, and statesman who became the first President of independent India, serving from 1950 to 1962—the longest tenure of any Indian president. Born in Bihar, he was deeply influenced by Mahatma Gandhi, joining the independence movement and participating in major campaigns including the Non-Cooperation Movement, Salt Satyagraha, and Quit India Movement, enduring multiple imprisonm
- GeneralClass 12All
NECC
NECC most commonly stands for National Egg Coordination Committee, an organization in India involved in egg production, marketing, and promotion, working to increase egg consumption through awareness about its nutritional benefits and supporting the poultry industry. The committee works on market development, quality standards, and promoting eggs as an affordable, high-quality protein source, particularly important for addressing malnutrition in India where protein deficiency remains a signif
- GeneralClass 12All
As Far as Hemisphere is Concerned India Lies in
As far as hemisphere is concerned, India lies in the Northern Hemisphere and the Eastern Hemisphere. The Northern Hemisphere is the half of Earth that lies north of the Equator (0° latitude), while the Eastern Hemisphere is generally defined as the half of Earth east of the Prime Meridian (0° longitude) and west of 180° longitude. India's mainland extends from approximately 8°4'N to 37°6'N latitude and from 68°7'E to 97°25'E longitude, placing it entirely north of
- GeneralClass 12All
Coercion Meaning
Coercion is the practice of forcing or compelling someone to act or behave in a particular way against their will through threats, intimidation, manipulation, or force, violating their freedom of choice and autonomy. Coercion can be physical (using or threatening violence), psychological (emotional manipulation, threats, intimidation), economic (exploiting financial dependence or threatening economic harm), or legal/institutional (misusing authority or legal systems to force compliance). The
- GeneralClass 12All
Acetic Acid Formula
The chemical formula for acetic acid is CH₃COOH or C₂H₄O₂, representing a simple organic acid containing two carbon atoms, four hydrogen atoms, and two oxygen atoms arranged in a specific structure. The formula CH₃COOH better represents the molecular structure: a methyl group (CH₃) attached to a carboxyl group (COOH), which gives acetic acid its acidic properties. The carboxyl group's hydrogen can dissociate in water, releasing H⁺ ions and forming acetate ions (CH₃COO⁻), making the solution a
- GeneralClass 12All
Who Wrote Mahabharata
The Mahabharata is traditionally attributed to Sage Vyasa (also known as Veda Vyasa or Krishna Dvaipayana), one of the most revered figures in Hindu tradition, who is considered not just the author but also a character within the epic itself. According to legend, Vyasa composed the Mahabharata and dictated it to Lord Ganesha, who served as the scribe with the condition that Vyasa must recite continuously without pause, while Ganesha agreed to write only if he understood every verse—this
- GeneralClass 12All
Agitated Meaning
Agitated means feeling or appearing troubled, nervous, disturbed, or upset, characterized by physical restlessness or emotional distress. The term describes a state of heightened unease where someone cannot remain calm or composed, often manifesting through fidgeting, pacing, rapid speech, inability to sit still, or visible signs of anxiety or irritation. Agitation can result from various causes: stress, anxiety, fear, anger, frustration, physical discomfort, medical conditions, or substance