Category: Physics

Does the universe have a center? There is no centre of the universe! According to the standard theories of cosmology, the universe started with a “Big Bang” about 14 thousand million years ago and has been expanding ever since. Yet there is no centre to the expansion; it is the same everywhere. Is Tulsa really […]

Is Salad a mixture? Mixtures are two or more substances that are mixed together but not chemically joined. A good example of a mixture is a salad. There are tomatoes, lettuce, cucumbers, and salad dressing all mixed together. No chemical reactions occur between the vegetables and the dressing. Is sand a mixture? Answer: Sand and […]

Which is not mineral? Steel is not a mineral because it is an alloy produced by people. “Inorganic” means that the substance is not made by an organism. Wood and pearls are made by organisms and thus are not minerals. “Solid” means that it is not a liquid or a gas at standard temperature and […]

What is the sign of proportion? Symbol “∝” stands for ‘is proportional to’. When two quantities x and y are in inverse proportion (or vary inversely) they are written as x ∝ 1 y . What is indirect proportion in math? If one value is inversely proportional to another then it is written using the […]

Which one of the following is the strongest reducing agent? Lithium Which of the following is only reducing agent? KMnO4​ Is hno3 a reducing agent? In nitric acid, the oxidation state of nitrogen is +5, that is the maximum oxidation state nitrogen can acquire in a compound. So it can get oxidised to +5 state […]

What are the 2 heaviest subatomic particles? Electrons are negatively charged and are the heaviest subatomic particle. Protons are positively charged and the lightest subatomic particle. Neutrons have no charge and are the lightest subatomic particle. Which is heavier neutron or positron? So, based on given details we can conclude that neutron is the heaviest […]

What happens when a wave strikes an object and bends? Reflection occurs when waves bounce back from a surface that they cannot pass through. Refraction occurs when waves bend as they enter a new medium at an angle and start traveling at a different speed. Diffraction occurs when waves spread out as they travel around […]

How many miles is it to walk around an acre? A square acre is 208.7 feet on a side, so the perimeter of an acre is about 835 feet, or about 16 percent of a mile. If you walk a brisk pace of 3 miles an hour, you can cover a mile in 20 minutes. […]

How do neurons communicate? Neurons talk to each other using special chemicals called neurotransmitters. Neurotransmitters are like chemical words, sending “messages” from one neuron to another. There are many different sorts of neurotransmitters: some stimulate neurons, making them more active; others inhibit them, making them less active. Why are neurons important? Neurons are responsible for […]

What is a equivalent expression? What are equivalent expressions? Equivalent expressions are expressions that work the same even though they look different. If two algebraic expressions are equivalent, then the two expressions have the same value when we plug in the same value(s) for the variable(s). What is an equivalent? 1 : equal in force, […]