General Science Mixed Quiz: Set 86

This statement is wrong: the gravitational force between two bodies depends on their masses and on the distance between them.

A beam seen from the side is visible only because tiny particles send some of its light sideways. Light travelling in a straight line cannot enter our eyes unless something redirects it towards us.

Charge equals current multiplied by time, so Q = 1.5 A × 0.010 s = 0.015 C. Electric current is the rate at which charge flows, I = Q/t, so the charge that passes in a given time is Q = I × t. One ampere means one coulomb of…

Rotational kinetic energy is ½Iω², and the ring has the larger moment of inertia. For a thin ring about the axis through its centre and perpendicular to its plane, all the mass sits at distance R, so I = MR².

Only this equation has the same number of iron, hydrogen and oxygen atoms on both sides. Iron reacts with steam to form iron(II,III) oxide and hydrogen gas.

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

Milk of magnesia is a suspension of magnesium hydroxide, a mild base that neutralises excess stomach acid without harming the body.

Together the two resins take out every dissolved ion, which leaves demineralised water. In the cation exchange resin (written RH), metal ions such as Ca2+, Mg2+ and Na+ are swapped for H+ ions.

Lysosomes are membrane-bound sacs of digestive enzymes that break down foreign material such as bacteria and worn-out cell parts. Lysosomes are formed by the Golgi apparatus and contain hydrolytic enzymes that work in an acidic interior.

Calcium chloride is an ionic compound, so it has a formula unit mass rather than a molecular mass, and the value is found by adding the atomic masses of all the atoms in the formula.

Platelets plug a damaged vessel and start the chain that forms a clot. Platelets, or thrombocytes, are small cell fragments made from large cells called megakaryocytes in the bone marrow.

Hooke's law holds only as far as the limit of proportionality, and that limit is either equal to or lower than the elastic limit, so statements 1 and 4 are the correct pair.

Infectious jaundice, caused mainly by the hepatitis A and hepatitis E viruses, spreads through water and food contaminated with faeces.

Glass is made by melting silica sand with fluxes and stabilisers, and this option lists the standard batch. Silica, from pure sand, forms the glassy network.

Breaking down carbohydrates to release energy is respiration, which happens in the cytoplasm and mitochondria, not a job of chlorophyll.

Levers are grouped by where the fulcrum, the load and the effort sit. In a second class lever the load lies between the fulcrum and the effort.

Transfer RNA picks up a specific amino acid and brings it to the ribosome, where it is added to the growing protein chain.

Diffusion is the spontaneous mixing of the particles of two substances, caused by the constant motion of those particles. Particles of matter are always moving and have spaces between them.

Where oil meets water, the unequal pull of their molecules sets up a surface (interfacial) tension that keeps the two liquids as separate layers.

Violet light has the shortest wavelength among the visible colours, so the medium bends it the most. The splitting of white light into its colours is called dispersion.