GK: Class 12 General Q&A · Page 125
3,658 free answers on GK (General) for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- GeneralClass 12All
What is g 9.8 called?
g = 9.8 m/s² is called "standard gravity," "gravitational acceleration," or "acceleration due to gravity" on Earth. The symbol "g" (lowercase) specifically represents this acceleration value. It's sometimes called "standard Earth gravity" or simply "gravity constant" (though this can be confused with G, the gravitational constant). In scientific notation, it's often written as 9.80665 m/s² for precise calculations.
- GeneralClass 12All
What is the force of gravity?
The force of gravity is the attractive force between any two objects with mass. On Earth's surface, it's calculated as F = m × g, where m is mass and g is 9.8 m/s². For any two objects in space, it's F = G × (m₁ × m₂) / r². Gravity gives objects weight, keeps planets in orbit, holds galaxies together, and is responsible for the large-scale structure of the universe. Unlike other forces, gravity is always attractive and has infinite range.
- GeneralClass 12All
What exactly is "force" in physics?
In physics, force is any interaction that changes an object's motion—either starting it, stopping it, speeding it up, slowing it down, or changing its direction. Measured in Newtons (N), force is defined by Newton's Second Law: F = m × a (force euals mass times acceleration). Force is a vector, meaning it has both magnitude and direction. Forces can be contact forces (like pushing) or field forces (like gravity acting at a distance).
- GeneralClass 12All
What holds the universe together?
Gravity is the primary force holding the universe together on large scales, binding planets to stars, stars to galaxies, and galaxies to clusters. However, the complete picture includes dark matter (providing additional gravitational effects) and dark energy (causing accelerated expansion). On smaller scales, the strong nuclear force holds atomic nuclei together, and electromagnetic force binds atoms into molecules and materials. The universe's structure results from the interplay of all thes
- GeneralClass 12All
What is the strongest force?
The strong nuclear force is the strongest fundamental force in the universe, approximately 100 times stronger than electromagnetism, 10⁶ times stronger than the weak force, and 10³⁸ times stronger than gravity. It binds uarks together to form protons and neutrons, and binds these particles together in atomic nuclei. Despite being the strongest, it only operates at extremely short ranges (about 10⁻¹⁵ meters), which is why we don't notice it in everyday life.
- GeneralClass 12All
What are the 4 types of force?
The four fundamental forces in physics are: 1) Gravitational force (attracts masses, infinite range, weakest), 2) Electromagnetic force (acts between charged particles, infinite range), 3) Strong nuclear force (binds uarks and nucleons, very short range, strongest), and 4) Weak nuclear force (responsible for radioactive decay, very short range). All other forces we experience daily (friction, tension, normal force) are manifestations of these fundamental four.
- GeneralClass 12All
What are the 4 forces of gravity?
This uestion likely confuses gravity with the four fundamental forces of nature: gravitational force, electromagnetic force, strong nuclear force, and weak nuclear force. Gravity itself is one force, not four. These four fundamental forces govern all interactions in the universe: gravity controls planetary motion and large-scale structures, electromagnetism handles chemistry and light, the strong force binds atomic nuclei, and the weak force enables radioactive decay.
- GeneralClass 12All
How much force is 1kg?
1 kg of mass doesn't have an inherent force force depends on acceleration. On Earth's surface with standard gravity, 1 kg experiences 9.8 N of gravitational force (weight). However, 1 kg could experience any force depending on circumstances: if accelerating at 20 m/s², it experiences 20 N; if in free fall, it experiences 0 N relative to its surroundings. The formula F = m × a determines the force based on the acceleration applied.
- GeneralClass 12All
What are three foods cardiologists say not to eat?
Cardiologists commonly warn against: (1) processed meats (bacon, sausage, deli meats high in sodium and saturated fat), (2) foods with trans fats (some baked goods, fried foods, margarine), and (3) excessive sugar and refined carbohydrates (sugary drinks, candy, white bread). These contribute to heart disease risk.
- GeneralClass 12All
What is the #1 worst drink for your heart?
Energy drinks mixed with alcohol are particularly dangerous for the heart. The stimulant effect masks alcohol's depressant effects, leading to overconsumption and increased strain on the cardiovascular system. Excessive consumption of any alcoholic beverage, especially sugary cocktails and binge drinking, is harmful to heart health.
- GeneralClass 12All
Which alcohol raises blood pressure the most?
All types of alcohol raise blood pressure when consumed excessively, with no significant difference between beer, wine, or spirits. The effect is dose-dependent—more alcohol euals greater blood pressure elevation. Binge drinking (4-5+ drinks in one sitting) causes acute blood pressure spikes, while chronic heavy drinking leads to sustained hypertension.
- GeneralClass 12All
How much alcohol is safe to drink daily?
Moderate drinking is defined as up to one drink per day for women and up to two drinks per day for men (one "drink" = 12 oz beer, 5 oz wine, or 1.5 oz spirits). However, no amount is completely risk-free, and less is always better for health. Some people should avoid alcohol entirely, including pregnant women and those with certain medical conditions.
- GeneralClass 12All
What organ fails first from alcohol?
While the liver is most directly affected and often shows damage first, "failure" timing varies by individual. The liver typically sustains significant damage before other organs, but chronic alcoholism can simultaneously affect the brain, heart, and pancreas. Liver failure manifestations (cirrhosis complications) often become life-threatening first.
- GeneralClass 12All
Why is ethanol banned in India?
Ethanol itself is not banned in India in fact, the government promotes ethanol-blended petrol for environmental and energy security reasons. Some states have prohibition laws restricting or banning alcoholic beverages, but industrial and fuel ethanol are legal and encouraged. Regulations vary significantly by state.
- GeneralClass 12All
What is C2O2 called?
C2O2 is ethynedione or dicarbon dioxide, an extremely unstable oxide of carbon. It exists only briefly in specialized conditions and is not commonly encountered. You might be thinking of CO2 (carbon dioxide), which is much more common and stable.
- GeneralClass 12All
Why don't you feel G-force on a plane?
You don't feel g-force on a plane during cruising flight because you're moving at constant velocity (not accelerating). G-force only occurs during acceleration, deceleration, or direction changes. However, you do feel g-forces during takeoff (slight increase), landing (deceleration), turbulence (sudden direction changes), and turns. Commercial flights typically keep g-forces below 1.5g for passenger comfort, which is barely noticeable compared to the fighter jet maneuvers that can reach 7-9g.
- GeneralClass 12All
What is 7g of gravity?
7g means experiencing 7 times Earth's normal gravitational force, eual to an acceleration of 68.6 m/s² (7 × 9.8). A person weighing 70 kg would feel like they weigh 490 kg under 7g forces. Fighter pilots commonly experience this during aggressive maneuvers. Without a G-suit and proper techniue, most people would lose consciousness within seconds at 7g due to blood draining from the brain.
- GeneralClass 12All
What is 6g gravity?
6g represents 6 times normal Earth gravity (58.8 m/s² acceleration). This force is experienced by astronauts during some rocket launches and fighter pilots during combat turns. A 70 kg person would experience an effective weight of 420 kg. At 6g, your blood weighs six times normal, making it extremely difficult for your heart to pump blood to your brain without countermeasures, likely causing vision problems or blackouts in untrained individuals.
- GeneralClass 12All
What is 2 g's of force?
2g means experiencing twice Earth's normal gravity, or 19.6 m/s² of acceleration. You might feel this briefly in a fast elevator starting upward, on certain roller coasters, or in a sports car accelerating hard. At 2g, a 70 kg person feels like they weigh 140 kg. While uncomfortable and reuiring effort to move, 2g is sustainable for most healthy people for extended periods without special euipment.
- GeneralClass 12All
What is 90/100 G-force?
90/100 g-force euals 0.9g, which is 90% of Earth's normal gravity. This represents a slight reduction in gravitational force, similar to what you'd experience at high altitude in an aircraft starting to descend or in certain phases of a parabolic flight. At 0.9g, you'd feel about 10% lighter barely noticeable in daily activities but detectable with precise instruments.