Do magnets get stronger if you stack them?

Do magnets get stronger if you stack them? Once a magnet is fully magnetised, it cannot be made any stronger as it is fully ‘saturated’. As more magnets are stacked together, the strength will increase until the length of the stack is equal to the diameter. After this point, any further magnets added will provide […]

What is the oldest ice core sample?

What is the oldest ice core sample? The deepest ice core records come from Antarctica and Greenland, where the very deepest ice cores extend to 3 kilometers (over two miles) in depth. The oldest continuous ice core records extend to 130,000 years in Greenland, and 800,000 years in Antarctica. What two events must occur for […]

What are contour lines for Class 7?

What are contour lines for Class 7? (i) Contour lines are isolines of height. (ii) These are drawn by joining the places of equal altitude. (iii) These help in identification of land forms and their altitude from sea level. (iv) These lines also help us to understand the nature and direction of the slope. What […]

Which country is coal rich and oil poor?

Which country is coal rich and oil poor? India: Rich in coal but poor in energy. What is chemical formula of oil? The chemical formula for crude oil is CnH2n+2, where n is a positive integer. Crude oil is basically a combination of several hydrocarbon molecules, comprising hydrogen, H and carbon atoms, C. Among the […]

What was the conclusion of the gold foil experiment?

What was the conclusion of the gold foil experiment? Rutherford’s gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. Based on these results, Rutherford proposed the nuclear model of the atom. Why was gold foil used in Rutherford’s experiment? Rutherford used gold for his scattering experiment because […]

What are the two theories of population?

What are the two theories of population? The theories are: 1. The Malthusian Theory of Population 2. The Optimum Theory of Population 3. The Theory of Demographic Transition. What are the three basic phases of population growth? They are: (i) the high stationary phase marked by high fertility and mortality rates; (ii) the early expanding […]

Is it harmful to reheat tea?

Is it harmful to reheat tea? First things first, do not reheat the tea if it has been left at room temperature for anywhere between 4 to 8 hours. If you forgot to have your tea for a maximum of 10 to 15 minutes, it is safe to drink. The presence of milk results in […]

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