46. Earth elements that have intermediate properties between those of metals and non-metals are called:
(A) Metallurgy
(B) Metalloid
(C) Elementary
(D) Sub-atomic
Answer:
(B) Metalloid
Explanation:
Metalloids (such as silicon and boron) are chemical elements whose physical and chemical properties fall in between, or are a mixture of, those of typical metals and non-metals.
47. The solubility of gases generally decreases as temperature _______.
(A) decreases
(B) breaks even
(C) saturates
(D) increases
Answer:
(D) increases
Explanation:
According to Henry’s Law and chemical principles, the solubility of a gas in a liquid solvent typically decreases as the temperature of the solution increases because higher kinetic energy causes gas molecules to escape.
48. Select the odd one out from the following.
(A) Crust
(B) Mantle
(C) Membrane
(D) Core
Answer:
(C) Membrane
Explanation:
The Crust, Mantle, and Core are the three primary geological layers of the Earth. A “membrane” is a biological or synthetic structural layer, making it the odd one out.
49. The side-view mirrors on vehicles show:
(A) bigger than the actual size of the object
(B) inverted image of the object
(C) smaller than the actual size of the object
(D) same as the size of the object
Answer:
(C) smaller than the actual size of the object
Explanation:
Vehicle side-view mirrors use convex mirrors. Convex mirrors always form virtual, erect, and diminished (smaller) images of objects, which provides the driver with a wider field of view.
50. The concave mirror _______ a light beam while the _______ mirror diverges it.
(A) converges, convex
(B) diverges, concave
(C) reflects, spherical
(D) refracts, plane
Answer:
(A) converges, convex
Explanation:
In optics, a concave mirror focuses (converges) incident light rays inward to a focal point. Conversely, a convex mirror spreads out (diverges) the light rays that strike it.
