Category: Physics

What are the most common driving mistakes? Here’s a list of the 10 most common mistakes we humans make when operating an automobile. Crossing Lanes While Turning. Using Your Daylights At Night. Bad Seating Position. Riding The Brakes. Leaving Your High Beams On. Not Using Your Turn Signal. Driving Slowly In The Passing Lane. Not […]

Which light scatters most? Violet light Why is Red scattered the least? When light enters the atmosphere, it is scattered by small air particles. The scattering of light is inversely proportional to the fourth power of its wavelength. As the red light has the highest wavelength among all the colours in the visible light, it […]

Is Kingdom Protista unicellular or multicellular? The kingdom Protista contains the single-celled eukaryotes in contrast to the bacteria which are examples of the prokaryotic cell type. Protists are a diverse group of organisms that are either unicellular or multicellular without highly specialized tissues. Is algae a protist? Algae, singular alga, members of a group of […]

Which sphere do humans belong to? Humans (biosphere) built a dam out of rock materials (geosphere). Water in the lake (hydrosphere) seeps into the cliff walls behind the dam, becoming groundwater (geosphere), or evaporating into the air (atmosphere). How do all 5 spheres interact? All the spheres interact with other spheres. For example, rain (hydrosphere) […]

Is pass to the left a firm rule? You may never pass a vehicle which has stopped at a crosswalk to allow a pedestrian to cross. A. Wrong because “pass to the left” is a firm rule. Which of the following is not a safe situation for passing? When moving through an intersection. WHen pavement […]

How do we use sound energy? The simplest and most obvious use of sound energy is for hearing. Humans can hear frequencies between about 20 Hz and 20,000 Hz. Another way that we use sound waves to learn about our surroundings is SONAR (short for Sound Navigation And Ranging), which is used to map objects […]

Why do tennis balls bounce higher on hills than airplanes? The acceleration due to gravity varies with height as g’ = (1-2h/R) where R is the radius of the Earth and h is the height.As the formula indicates g decreases as height increasesSo on the hills the acceleration due to gravity is lesser and the […]

Does a gas have a definite volume? A gas does not have a definite shape or volume. Gas molecules will spread out evenly to fill any container. You could use the following example to help students appreciate how far apart the molecules of a gas are compared to the molecules in a liquid or solid: […]

Does oxygen have mass since it is a gas? Oxygen has an atomic mass of 16 gram per mole. The gas oxygen that is in the “air” has the formula O2. The formula for carbon dioxide is CO2, that means one atom of carbon and two atoms of oxygen. The atomic mass of carbon is […]

Does internal resistance change with current? As current decreasesd, voltage across the internal resistance of the cell, Ir, decreased (using V=IR), because internal resistance should remain constant. Therefore voltage across the terminals increased (as less is wasted across the internal resistor). Does internal resistance depend on external resistance? Generally, the external resistance should be comparable […]