General Science Mixed Quiz: Set 76

Force depends on how fast momentum changes, not on the momentum itself. Newton's second law states that the rate of change of momentum of a body is proportional to the net force on it and takes place in the direction of the force.

Accelerators speed up the vulcanisation of rubber; they are not a part of paint.

In household wiring the wire with green insulation is the earth wire, not the live wire, so this statement is not correct.

A ligament is the connective tissue that joins one bone to another at a joint. It is very elastic and strong, and it holds the bones in place so that a joint can move without the bones slipping apart.

A medium more concentrated than the cell is hypertonic, so water leaves the cell by osmosis. In osmosis water moves across a selectively permeable membrane from the side with fewer dissolved particles to the side with more.

The fusion of a male gamete with a female gamete is called fertilisation, and the single cell it produces is the zygote.

The parietal (oxyntic) cells in the lining of the stomach secrete hydrochloric acid into the gastric juice. Hydrochloric acid makes the stomach strongly acidic, with a pH of roughly 1.5 to 3.5.

The hepatitis B vaccine was the first vaccine made by recombinant DNA technology.

Xylem carries water along with the minerals dissolved in it from the roots up to the stem and leaves. Plants have two kinds of conducting tissue.

Abscisic acid is the one plant hormone in this list that slows growth instead of speeding it up, which is why it is often called the stress hormone of plants.

Both changes let more molecules escape from the surface each second. Evaporation is a surface process: only molecules at the surface with enough energy break away into the air.

Galileo was the first to argue that, with air resistance removed, every body falls with the same acceleration regardless of its mass.

More than three-fourths of all described animal species are arthropods, that is insects, spiders, scorpions, centipedes, crabs and prawns. A hard chitinous exoskeleton, jointed appendages, small body size and, in insects, the power of flight allowed the group to spread into almost every habitat on earth.

Litmus is a purple dye taken from lichens, and in the classification used in school science lichens are placed in Thallophyta, the group of simple plants whose body is an undifferentiated thallus with no true root, stem or leaf.

This bacterium ferments the lactose of milk into lactic acid, and the acid makes the milk protein coagulate, which is why a spoonful of old curd added to warm milk sets the whole vessel.

An ordinary filament bulb is filled with a mixture of argon and nitrogen because both are chemically unreactive and will not burn the white-hot tungsten filament.

During a hard sprint the muscles run short of oxygen and switch to anaerobic respiration, which leaves lactic acid behind.

One parsec equals about 2,06,265 astronomical units, which rounds to 2 × 10⁵ A.U.

Marie Curie discovered radium; the first two pairs have their discoveries swapped. Marie Curie and Pierre Curie discovered the radioactive elements polonium and radium in 1898, and Marie Curie went on to win Nobel Prizes in both physics (1903) and chemistry (1911).

Marsilea is a water fern, a pteridophyte, and pteridophytes are the first land plants with true vascular tissues, xylem and phloem.