General Q&A for Class 12
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- GeneralClass 12CBSE
Electric Field at Centre of Ring with Non-Uniform Charge Distribution. Four quadrants carry linear charge densities: +2λ, −2λ, +λ, −λ. Find electric field at centre.
For a quarter-circle arc of linear charge density λ and radius R, the field at the centre has magnitude:E_quadrant = (√2 λ) / (4πε₀R)Direction: along the bisector of the quadrant, pointing away from arc (for +λ) or toward arc (for −λ).Resolving all four quadrant fields into x and y components:Ex = [−2 − 2 + 1 + 1] × (λK/√2) = −2λK/√2Ey = [−2 + 2 + 1 − 1] × (λK/√2) = 0Magnitude:|E| = 2λK/√2 = λ / (2πε₀R)<
- GeneralClass 12CBSE
P°(hexane) = 408 Torr, P°(heptane) = 141 Torr. x(hexane) = 0.300. Find Y₆ and Y₇.
Step-1: Partial pressures:P(hexane) = 0.300 × 408 = 122.4 TorrP(heptane) = 0.700 × 141 = 98.7 TorrStep-2: Total pressure:P_total = 122.4 + 98.7 = 221.1 TorrStep-3: Vapour mole fractions:Y₆ (hexane) = 122.4 / 221.1 ≈ 0.554Y₇ (heptane) = 98.7 / 221.1 ≈ 0.446Answer: Y₆ ≈ 0.554, Y₇ ≈ 0.446
- GeneralClass 12CBSE
2N₂O₅(g) → 4NO₂(g) + O₂(g). Initial P = 50 mmHg; P at 30 min = 87.5 mmHg. Find P at 60 min.
Step-1: Let N₂O₅ decrease by 2p. Total pressure = 50 + 3p:50 + 3p = 87.5 ⇒ p = 12.5 mmHgP(N₂O₅) at 30 min = 50 − 2(12.5) = 25 mmHgStep-2: Rate constant (first order):k = (1/30) × ln(50/25) = ln(2)/30 = 0.02310 min⁻¹Step-3: P(N₂O₅) at 60 min (= two half-lives = 25% of initial):P(N₂O₅) at 60 min = 50/4 = 12.5 mmHgStep-4: Total pressure at 60 min:Decrease = 50 − 12.5 = 37.5
- GeneralClass 12All
What is the difference between psychosis and neurosis?
Psychosis and neurosis are terms historically used in the field of psychology to describe certain mental health conditions, but their usage and classification have evolved. In modern psychiatric terminology, these terms have been largely replaced by more specific and clinically defined diagnoses. However, understanding their historical context can provide insight into their original meanings: Psychosis: Definition (Historical): Psychosis: Historically, psychosis was us
- GeneralClass 12All
What is the difference between prism and a pyramid?
Prisms and pyramids are both three-dimensional geometric shapes, but they have distinct characteristics and shapes. Here are the key differences between a prism and a pyramid: Prism: Shape: Prism: A prism is a polyhedron with two parallel and congruent polygonal bases connected by rectangular or parallelogram faces. The bases are parallel and identical in shape. Faces: Prism: Has rectangular or parallelogram faces connecting corresponding vertices of th
- GeneralClass 12All
What is the difference between phrase and clause?
In linguistics and grammar, a phrase and a clause are both groups of words, but they serve different functions in a sentence. Here are the key differences between a phrase and a clause: Phrase: Definition: Phrase: A phrase is a group of words that functions as a single unit within a sentence. It does not have a subject and a predicate. Components: Phrase: Consists of one or more words but lacks a finite verb. It can include nouns, verbs, adjectives, adv
- GeneralClass 12All
What is the difference between petrol and diesel?
Petrol (gasoline) and diesel are two different types of fuels commonly used in internal combustion engines. Here are the key differences between petrol and diesel: Composition: Petrol (Gasoline): Composition: Petrol is a mixture of hydrocarbons, typically obtained from crude oil through a refining process. It consists of lighter hydrocarbons, such as octane and heptane. Diesel: Composition: Diesel is also derived from crude oil but has a different compo
- GeneralClass 12All
What is the difference between perfect competition and monopoly?
Perfect competition and monopoly are two extreme market structures that represent opposite ends of the spectrum in terms of market organization and the number of sellers. Here are the key differences between perfect competition and monopoly: Perfect Competition: Number of Sellers: Perfect Competition: In perfect competition, there are a large number of sellers or firms. No single seller has a significant influence on the market price. Product Differentiation:</
- GeneralClass 12All
What is the difference between parametric and non-parametric tests?
Parametric and non-parametric tests are statistical methods used to analyze data, but they differ in their assumptions and the types of data they are suitable for. Here are the key differences between parametric and non-parametric tests: Parametric Tests: Assumptions: Parametric Tests: Make specific assumptions about the underlying population distribution, typically assuming that the data follows a specific probability distribution (often the normal distribution).
- GeneralClass 12All
What is the difference between paneer and tofu?
Paneer and tofu are both popular protein-rich foods used in various cuisines, but they have different origins, textures, and nutritional profiles. Here are the key differences between paneer and tofu: Paneer: Origin: Paneer: Paneer is a fresh cheese that originated in the Indian subcontinent. It is commonly used in Indian, Pakistani, and Bangladeshi cuisines. Ingredients: Paneer: Made from cow's milk, paneer is produced by curdling milk with an acidic a
- GeneralClass 12All
What is the difference between paging and segmentation?
Paging and segmentation are memory management schemes used in computer operating systems to organize and allocate memory for processes. They have different approaches to managing memory, and here are the key differences between paging and segmentation: Paging: Division of Memory: Paging: Divides physical memory into fixed-size blocks called pages. Similarly, the logical memory is divided into fixed-size blocks known as page frames. Unit of Transfer: Pag
- GeneralClass 12All
What is the difference between multiprogramming and multitasking?
Multiprogramming and multitasking are both concepts related to the concurrent execution of multiple processes in computer systems, but they have different meanings and implications. Here are the key differences between multiprogramming and multitasking: Multiprogramming: Definition: Multiprogramming: Involves the concurrent execution of multiple programs or processes by a computer system. The system keeps several programs in main memory simultaneously and switches betw
- GeneralClass 12All
What is the difference between modem and router?
A modem and a router are two distinct devices that play different roles in a home or business network. Here are the key differences between a modem and a router: Modem: Function: Modem: Stands for "modulator-demodulator." Its primary function is to modulate and demodulate signals to enable the transmission of digital data over analog communication lines. Modems connect a computer or network to the Internet service provider (ISP) using various transmission technologies such as DSL, cable, fibe
- GeneralClass 12All
What is the difference between men and man?
"Men" and "man" are terms used to refer to human males, but they are used in different contexts and have distinct grammatical functions. Man: Singular Form: Man: Singular form used to refer to an adult human male. General Reference: Man: Can be used in a generic or general sense to refer to humanity as a whole. For example, "Man has explored outer space." Synonyms: Man: Can be used as a synonym for an adult male individual. Men: Plural Form: Men: Plural form of "man," used to refer to more th
- GeneralClass 12All
What is the difference between merger and acquisition?
Merger and acquisition are terms often used in the business world to describe the combination or integration of two companies. However, they have distinct meanings and implications. Here are the key differences between a merger and an acquisition: Merger: Definition: Merger: A merger is a strategic business combination in which two or more companies agree to combine their operations and assets to form a new entity. Resulting Entity: Merger: Results in t
- GeneralClass 12All
What is the difference between marginal costing and absorption costing?
Marginal costing and absorption costing are two different approaches used in managerial accounting for the allocation of production costs to products. Here are the key differences between marginal costing and absorption costing: Marginal Costing: Focus on Variable Costs: Marginal Costing: Focuses on variable costs (direct costs) associated with production, such as direct materials, direct labor, and variable manufacturing overhead. Treatment of Fixed Costs:
- GeneralClass 12All
What is the difference between magma and lava?
"Magma" and "lava" refer to molten rock beneath and above the Earth's surface, respectively. The key difference lies in their location and state. Here are the distinctions between magma and lava: Magma: Location: Magma: Magma is molten rock that is located beneath the Earth's surface, typically within the Earth's crust or mantle. State: Magma: Exists in a molten state but is still within the Earth, where it may be stored in magma chambers or move throug
- GeneralClass 12All
What is the difference between a Mac address and an IP address?
MAC address (Media Access Control address) and IP address (Internet Protocol address) are both identifiers used in computer networks, but they serve different purposes and operate at different layers of the networking stack. Here are the key differences between a MAC address and an IP address: MAC Address (Media Access Control address): Layer: MAC Address: Operates at the data link layer (Layer 2) of the OSI model. Uniqueness: MAC Address: Unique physic
- GeneralClass 12All
What is the difference between living and non-living things?
Living and non-living things are two broad categories that distinguish entities based on fundamental characteristics related to life processes. Here are the key differences between living and non-living things: Living Things: Characteristics of Life: Living Things: Exhibit characteristics of life, including cellular organization, metabolism (the ability to obtain and use energy), responsiveness to stimuli, growth, development, reproduction, adaptation, and the ability
- GeneralClass 12All
What is the difference between linear and logistic regression?
Linear regression and logistic regression are both techniques used in statistical modeling and machine learning, but they serve different purposes and are applied to different types of problems. Here are the key differences between linear and logistic regression: Linear Regression: Type of Output: Linear Regression: Predicts a continuous output variable. The output can take any real value within a range. Use Cases: Linear Regression: Commonly used for predicting values such as house prices, t