General Science Mixed Quiz: Set 200

This goes against the conservation of charge: the total charge of an isolated system always stays the same. Electric charge has three basic properties.

The poise is the CGS unit of dynamic or absolute viscosity, named after the French physician Jean Poiseuille, and one poise equals one dyne-second per square centimetre, which is the same as one gram per centimetre per second.

Ammonium chloride sublimes: on heating, it changes directly from a solid into vapour without melting, and the vapour turns back into solid on a cool surface.

Ice melts at 0 degrees Celsius, and 0 degrees Celsius is 273 K on the Kelvin scale. To change Celsius into Kelvin, add 273 to the Celsius reading, so 0 + 273 gives 273 K; the melting point of ice is usually written as 273.15 K in exact work.

At sunrise and sunset sunlight passes through a much thicker layer of air, which scatters away most of the blue light and leaves mainly red and orange to reach our eyes.

Quartz is silicon dioxide (SiO 2 ), so it contains silicon and oxygen. Quartz is one of the most common minerals in the Earth's crust and the main part of sand.

Nuclear power plants produce energy by splitting heavy nuclei, and the energy released is given by Einstein's relation E = mc².

In the Mond process impure nickel is heated in a stream of carbon monoxide at a moderate temperature, forming the volatile compound nickel tetracarbonyl; the vapour is led away from the solid impurities and heated more strongly, whereupon it decomposes and deposits very pure nickel.

During a sprint the muscles need energy faster than the blood can supply oxygen, so they switch to anaerobic respiration and lactic acid builds up.

Silk is the protein fibroin, spun by the silkworm, so it is a polymer made by a living organism and is therefore natural, like cellulose, starch, wool and natural rubber.

The pituitary releases FSH and LH, and the ovary responds with estrogen and progesterone; together these hormones run the cycle.

It is the target of penicillin, which blocks its formation, and the amount of it in the wall is what makes a bacterium stain Gram-positive or Gram-negative.

Antibodies are made by B lymphocytes, which turn into plasma cells that release antibodies in very large numbers during an immune response.

Bronchioles are the fine branches of the airways in the lungs, and their walls have no cartilage. Cartilage is a firm but flexible connective tissue.

The juice in the stem of sugarcane is rich in sucrose, the ordinary table sugar we get from it. Sucrose is a disaccharide (C₁₂H₂₂O₁₁) made of one glucose and one fructose unit joined together.

The cervix is the lower, narrow neck of the uterus, so it belongs to the female reproductive system. The human male reproductive system has a pair of testes that make sperm and the hormone testosterone.

Algae are the predominantly aquatic members of the Kingdom Plantae. They are simple, chlorophyll-bearing organisms with a thallus body that is not divided into true roots, stems and leaves.

Ultraviolet light is an electromagnetic wave, and all electromagnetic waves are transverse, not longitudinal. In an electromagnetic wave, the electric and magnetic fields vibrate at right angles to each other and to the direction in which the wave travels, which is the mark of a transverse wave.

What looks like a single flower in a sunflower or marigold is really a head made of many tiny flowers, called florets, packed together.

Sulphuric acid has two replaceable hydrogen atoms, so its equivalent mass is 98 ÷ 2 = 49 g, and 49 g in one litre makes exactly one gram-equivalent per litre.