281. A body can escape the gravitational pull of the Earth if it is thrown up with a velocity of 7 miles per second.
282. An adult human being has 206 bones.
283. A person with blood type O is called a universal donor.
284. Myopia is a disease connected with the eyes.
285. The average adult pulse rate is 72-80 beats per minute.
286. Bats can fly in the dark because they are capable of taking the help of ultrasonic waves.
287. In order to prevent the corrosion of iron pipes, they are often coated with a layer of zinc. This process is termed galvanization.
288. Coulomb is the scientific unit to measure electric charge.
289. The chemical name of quartz is Silicon Dioxide.
290. Phosphorus is an essential component of nucleic acids.
291. Sulphur is a secondary plant nutrient.
292. When a patient’s immune system becomes reactive to a drug, this is an example of an allergy.
293. People living in high altitudes (like mountains) usually have a larger number of Red Blood Cells.
294. Electrons are negatively (-) charged particles of an atom.
295. The diesel engine was discovered by Rudolf Diesel.
296. The safety pin was invented by Walter Hunt.
297. The innermost part of the Earth is the Core.
298. There are 32 teeth in the human mouth.
299. Sunlight is composed of seven colors.
300. A glass chimney stops an oil lamp from smoking because it increases the supply of oxygen to the flame by convection and the heat produced ensures complete combustion.