BECE Science Objective

Question 1

The very hard greenish-black coating around the edges of your teeth is known as

Accepted Answer

plaque

Answer

Plaque is a sticky, colorless film of bacteria that constantly forms on your teeth. If not removed regularly through brushing and flossing, plaque can harden into tartar (calculus), which absorbs stains and can appear greenish-black, especially around the gum line and tooth edges. This hardened plaque is what the question describes.

Question 2

The technique of limiting the number of seedlings per stand to improve development is known as

Accepted Answer

thinning out.

Answer

Thinning out is a horticultural practice where excess or weaker seedlings are removed from a group. This technique is used to reduce competition among plants for resources like light, water, and nutrients, thereby improving the growth and development of the remaining, stronger seedlings.

Question 3

Which of the following electrical components is not built from semiconductors?

Accepted Answer

Capacitor

Answer

Semiconductors are materials like silicon and germanium that are fundamental to modern electronic components due to their unique electrical properties. LEDs, Transistors, and Diodes are all semiconductor devices that rely on the properties of p-n junctions. A capacitor, however, is a passive component that stores electrical energy in an electric field between two conductive plates separated by a dielectric (insulating) material, and its operation does not inherently rely on semiconductor materials.

Question 4

Which of the following bodily forms allows fluid to travel most easily?

Accepted Answer

Streamline

Answer

A streamline shape is designed to offer the least resistance to fluid flow, whether it's liquid or gas. Objects with streamlined forms, like fish, birds, or aircraft wings, allow the fluid to flow smoothly around them with minimal turbulence. This characteristic enables them to move through fluids most easily and efficiently compared to other shapes like triangular, rectangular, or spherical.

Question 5

One advantage of technology for industrialization is

Accepted Answer

provision of equipment.

Answer

When a ray of light passes from a less dense medium (like air) to a denser medium (like water or glass), it slows down. This change in speed causes the light ray to bend towards the normal, which is an imaginary line perpendicular to the surface at the point where the light enters the new medium. Conversely, when light goes from a denser to a less dense medium, it bends away from the normal.

(BECE) Basic Education Certificate Examination Practice Test

(BECE) Basic Education Certificate Examination Practice Test

BECE Science Objective