General Q&A for Class 12 · Page 191
5,215 free answers in General for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- GeneralClass 12All
What are the six laws of physics?
While physics has numerous laws, six fundamental ones are: (1) Newton's Three Laws of Motion (governing force and motion), (2) Law of Universal Gravitation (describing gravitational attraction), (3) Laws of Thermodynamics (governing energy and entropy), (4) Conservation Laws (energy, momentum, charge), (5) Maxwell's Equations (electromagnetic phenomena), and (6) Laws of Quantum Mechanics (subatomic behavior). These principles underpin all physical phenomena and technological applications.
- GeneralClass 12All
What is the hardest formula in physics?
The difficulty depends on context, but contenders include Einstein's field equations from General Relativity (describing spacetime curvature), Schrödinger's equation from quantum mechanics (describing wave functions), and Maxwell's equations (describing electromagnetic fields). For students, formulas involving complex calculus or multiple variables often feel hardest. However, apparent difficulty usually reflects unfamiliarity rather than inherent complexity—most formulas become ap
- GeneralClass 12All
What is the most famous formula in physics?
E = mc² is physics' most famous formula, developed by Albert Einstein. It states that energy (E) equals mass (m) times the speed of light (c) squared, revealing that mass and energy are interchangeable. This revolutionary equation explains nuclear reactions, powers stars, and enabled nuclear technology. While not a kinematics formula, it demonstrates how fundamental physics equations can reshape our understanding of the universe.
- GeneralClass 12All
How to crack physics?
To excel in physics: (1) build strong mathematical foundations, (2) visualize concepts through diagrams and real-life applications, (3) derive formulas yourself to understand their origin, (4) practice problems with increasing difficulty levels, (5) learn to identify which formula applies to which situation, (6) maintain a dedicated error log to track common mistakes, (7) study in focused sessions with breaks, (8) explain concepts to others to test your understanding, and (9) stay curious by
- GeneralClass 12All
How to score 95%+ in Class 12?
Achieving 95%+ requires: starting preparation early (not just before exams), mastering NCERT textbooks completely, solving at least 5-10 numerical problems daily, understanding derivations conceptually, practicing sample papers and previous years' questions exhaustively, taking regular mock tests, analyzing mistakes to avoid repetition, maintaining organized notes for quick revision, and staying consistent with time management. Focus equally on theory and numerical problems, as both carry sig
- GeneralClass 12All
How do you get 90% in physics?
To score 90% in physics: (1) understand concepts deeply rather than memorizing, (2) solve numerical problems daily from different sources, (3) create formula sheets with derivations, (4) practice previous years' question papers under timed conditions, (5) clarify doubts immediately with teachers, (6) study diagrams and graphs thoroughly, (7) relate physics to real-world examples, and (8) revise regularly with short notes. Focus on weak areas and maintain consistency throughout the year.
- GeneralClass 12All
Is Class 11 physics very hard?
Class 11 physics is challenging but manageable with the right approach. It introduces abstract concepts and mathematical rigor that differ from earlier grades. Topics like kinematics, laws of motion, and energy require analytical thinking. However, with regular practice, understanding concepts rather than memorizing formulas, and solving numerical problems daily, students can excel. The difficulty often stems from weak mathematical foundations or inadequate practice rather than the subject it
- GeneralClass 12All
Is kinematics 1D or 2D?
Kinematics can be both 1D, 2D, or even 3D depending on the motion being studied. One-dimensional (1D) kinematics deals with motion along a straight line, like a car on a highway. Two-dimensional (2D) kinematics involves motion in a plane, such as projectile motion where objects move both horizontally and vertically. Three-dimensional motion occurs in space, like the trajectory of a spacecraft.
- GeneralClass 12All
What is 2D kinematics?
Two-dimensional kinematics analyzes motion in a plane using both x and y coordinates. Classic examples include projectile motion (a thrown ball follows a parabolic path) and circular motion. In 2D kinematics, you resolve velocity and acceleration into horizontal and vertical components and analyze each direction independently using 1D equations, then combine the results to describe the complete motion.
- GeneralClass 12All
What are the three kinematics?
This likely refers to the three types of motion quantities in kinematics: position/displacement (where an object is), velocity (how fast and in what direction it's moving), and acceleration (how velocity changes over time). Alternatively, it could mean the three dimensions of motion (1D, 2D, and 3D) or the three fundamental equations of motion. Context determines which interpretation applies.
- GeneralClass 12All
What are the four types of kinematics?
The four types of kinematic motion are: linear motion (movement in a straight line), rotational motion (spinning around an axis), projectile motion (curved path under gravity), and oscillatory motion (back-and-forth movement). Each type has specific equations and characteristics. For example, rotational kinematics uses angular displacement, angular velocity, and angular acceleration instead of their linear counterparts.
- GeneralClass 12All
What are the 6 types of motion?
The six fundamental types of motion in physics are: translational (movement from one position to another), rotational (spinning around an axis), oscillatory (repetitive back-and-forth), periodic (regular repeating intervals), circular (movement along a circular path), and random (unpredictable, like Brownian motion). Objects can exhibit multiple types simultaneously—for example, Earth undergoes both rotational and translational motion.
- GeneralClass 12All
What are 20 types of motion?
While there are countless specific motion examples, they generally fall under these categories: rectilinear (straight line), curvilinear (curved path), circular, rotational, oscillatory, vibratory, periodic, non-periodic, uniform (constant velocity), non-uniform (changing velocity), translational, projectile, spinning, rolling, sliding, free fall, parabolic, elliptical, hyperbolic, and helical motion. Most real-world motions combine several of these types.
- GeneralClass 12All
What are 10 examples of projectile motion?
Common projectile motion examples include: a basketball thrown toward a hoop, a soccer ball kicked across a field, water from a fountain, a bullet fired from a gun, a javelin throw, a long jump in athletics, a golf ball hit off a tee, a baseball pitch, fireworks exploding in the sky, and an arrow shot from a bow. All follow a parabolic trajectory under gravity's influence with no propulsion after launch.
- GeneralClass 12All
What are two types of projectiles?
Projectiles are classified as: (1) horizontal projectiles, launched parallel to the ground with initial vertical velocity of zero (like a ball rolled off a table), and (2) oblique or angular projectiles, launched at an angle to the horizontal with both horizontal and vertical initial velocity components (like a cannon ball fired at 45 degrees). Both experience the same gravitational acceleration downward.
- GeneralClass 12All
: Is kinematics easy?
Kinematics can be straightforward if you understand the core concepts and practice regularly. The basic equations are logical once you grasp what each variable represents. However, students often struggle with choosing the right equation and setting up problems correctly. Success comes from: drawing diagrams, listing known and unknown variables, selecting the appropriate equation, and practicing diverse problems. With consistent effort, most students find kinematics manageable.
- GeneralClass 12All
What are 5 examples of motion in real life?
Five everyday motion examples are: a car driving down a road (translational motion), a ceiling fan spinning (rotational motion), a child on a swing (oscillatory motion), the Earth orbiting the Sun (circular motion), and a bouncing ball (combination of projectile and oscillatory motion). These demonstrate how physics principles apply to daily experiences, making kinematics practical and relevant.
- GeneralClass 12All
What is v² in kinematics?
In kinematics equations, v² (v squared) represents the square of final velocity. It appears in the equation v² = u² + 2as because this relationship eliminates the time variable, making it useful when time isn't known or needed. Squaring velocity also relates to kinetic energy (KE = ½mv²), connecting kinematics with energy concepts in physics.
- GeneralClass 12All
: What speed is 3×10⁸?
3×10⁸ meters per second (300,000,000 m/s or 300,000 km/s) is the speed of light in a vacuum, denoted by the symbol 'c'. This is the fastest speed possible in the universe according to Einstein's theory of relativity. Light travels this distance every second, which means it could circle Earth's equator about 7.5 times in just one second. This constant appears in Einstein's famous equation E=mc².
- GeneralClass 12All
Are 40°C and 40°F the same?
No, they are very different temperatures. 40°C equals 104°F (hot weather or a high fever), while 40°F equals 4.4°C (cold weather). The only temperature where Celsius and Fahrenheit show the same numerical value is -40 degrees (-40°C = -40°F