General Science Mixed Quiz: Set 15

Constant velocity means no acceleration, and by Newton's second law force equals mass into acceleration, so the net force must be zero.

At normal atmospheric pressure water stays liquid between 0 °C and 100 °C, and 12 °C lies inside that range.

The body is thrown up at 20 m/s and gravity takes away 10 m/s of speed every second, so after 2 seconds its speed is zero.

A silicon diode in forward bias drops about 0.7 volt across itself, whatever the supply voltage is.

Escape velocity is the minimum speed a body must be given so that it leaves the gravitational pull of the planet and never returns.

Solder is an alloy of lead and tin, usually in nearly equal parts. An alloy is a mixture of a metal with one or more other elements, made to gain a property the pure metal lacks.

This is the heat that one gram of water at a hundred degrees Celsius must absorb to become steam at the same temperature, with no rise in temperature at all; the same quantity is released when steam condenses back to water.

Algae belong to Thallophyta, the simplest division of the plant kingdom. Their body is a thallus, which means it is not divided into root, stem and leaf, and they have no vascular tissue.

A magnet cannot be cut into a single north pole and a single south pole.

It states that the upthrust on a body dipped fully or partly in a fluid equals the weight of the fluid the body pushes aside.

Force has to be applied to break the chalk because its particles hold one another together, and that pull is the force of attraction between particles.

Platelets are the tiny cell fragments that rush to a cut and start the clot. They are also called thrombocytes and are made in the bone marrow from large cells called megakaryocytes.

A centre-tap full wave rectifier needs two p-n junction diodes, one for each half of the input cycle. The secondary winding of the transformer is tapped at its middle, so its two halves give equal voltages of opposite sign.

Adrenaline is made by the adrenal glands, which sit like caps on top of the two kidneys. It is released in fear, anger or sudden danger, so it is called the "fight or flight" hormone.

The name itself says so: in Greek arthros means jointed and podos means foot, so arthropods are the animals with jointed legs.

This set is wrong because chikungunya is caused by a virus, the chikungunya virus, and not by bacteria. It is spread by Aedes mosquitoes, the same day-biting mosquitoes that carry dengue and Zika, and it causes high fever with severe joint pain.

The zygote divides as it travels down the fallopian tube and the resulting ball of cells gets implanted in the thick lining of the uterus.

Kinetic energy is half m v squared, so half of 22 multiplied by 5 multiplied by 5 gives 275 joules.

Pascal's law states that pressure applied to an enclosed fluid is transmitted undiminished in every direction to all parts of the fluid and to the walls of the container.

Both of these modes need matter: conduction passes energy from particle to particle and convection carries it by the movement of a fluid.