General Science Mixed Quiz: Set 157

With uniform acceleration, velocity changes by the same amount in every equal interval of time, so the velocity-time graph is a straight line whose slope equals the acceleration.

Pedology is the study of soils, including their formation from parent rock, their profile and horizons, their classification and their fertility, and it is the science behind soil surveys and land capability maps.

The refrigerator uses 5 kW × 10 h × 30 days = 1,500 kWh, and at ₹ 4 per kWh that costs ₹ 6,000.

The red cells of group O carry neither the A antigen nor the B antigen, so when they are transfused the antibodies in the recipient's plasma find nothing to bind to and the cells are not destroyed, which is why group O, and strictly O negative, can be given to…

The statement is false because the latent heat of fusion of ice is high, about 334 joules per gram, or roughly 80 calories per gram.

A small piece of tissue called an explant is placed in a sterile nutrient medium with growth regulators, it forms an unorganised mass called a callus and then whole plantlets, because a plant cell is totipotent, that is, able to give rise to a complete plant; the plants so raised…

The statement that the sensitivity of the human ear does not vary with frequency is false, because the ear is far more sensitive to some frequencies than to others.

The stapes, shaped like a stirrup, is the innermost of the three ossicles of the middle ear and is the smallest bone in the human body, measuring only a few millimetres; the smallest muscle of the body, the stapedius, is attached to it.

Inside a long, narrow solenoid the field lines run straight and parallel and are evenly spaced, which is the picture of a uniform field.

Pure alumina melts at a very high temperature, so it is dissolved in molten cryolite, which is sodium aluminium fluoride, usually with a little fluorspar added; this brings the working temperature down sharply and makes the melt a good conductor.

Almost all the mass of an atom is in its nucleus, so the mass number, which the question calls atomic mass, is the total of protons and neutrons, the two kinds of nucleons.

It takes most force to start an object moving, less to keep it sliding and least to keep it rolling.

In the rock-salt structure of sodium chloride, every Na+ ion is surrounded by six Cl− ions and every Cl− ion by six Na+ ions, so the coordination number is 6 for both.

Spindle fibres attach to the kinetochore, a disc-shaped protein structure on the centromere of each chromosome. During cell division the spindle, made of microtubules, pulls the copies of each chromosome apart.

Only statement 3 is correct: the acid must be added slowly to water, and dilution lowers the concentration of hydronium ions per unit volume.

For an ideal gas in a fixed volume at a fixed temperature, pressure is proportional to the number of molecules, so half the molecules give half the pressure.

Chloropropane has two carbon–carbon bonds, seven carbon–hydrogen bonds and one carbon–chlorine bond, all single covalent bonds, making 10 in total.

Each product has been linked to the chemical paired with it. Lead has been found as a trace contaminant in many lipsticks, coming from colour pigments; since lipstick is swallowed in small amounts, regular use raises concern because lead is a toxic heavy metal that harms the nervous system.

Lipids, including steroids and the phospholipids of membranes, are made by the smooth endoplasmic reticulum, so a defect there would stop lipid synthesis.

A ring of muscle at the lower end of the stomach, the pyloric sphincter, opens and closes to let food pass into the small intestine a little at a time.