Science Quiz

Ella is experimenting with how objects move when she pushes them. What branch of science is she most likely studying?

• a. physics

• b. biology

• c. chemistry

• d. astronomy

Answer explanation

Ella is studying physics because it focuses on the laws of motion and how objects move when forces, like pushing, are applied. The other options, biology, chemistry, and astronomy, do not primarily deal with motion.

After taking a bath, Noah noticed fog forming on the bathroom mirror. What caused this to happen?

• a. The mirror got wet from the faucet.

• b. The water droplets leaked from the pipe.

• c. The mirror turned hot from the steam.

• d. Condensation formed due to water vapor.

Answer explanation

The fog on the mirror is due to condensation, which occurs when warm, moist air from the bath cools upon contact with the cooler surface of the mirror, causing water vapor to turn into liquid droplets.

When are cleaning agents dangerous?

• a. when used properly and stored well

• b. when used to scrub kitchen surfaces

• c. when used for removing stains on tiles

• d. when poured onto garden soil as water

Answer explanation

Cleaning agents can be dangerous when poured onto garden soil, as they may harm plants and disrupt the ecosystem. Proper use and storage, as well as cleaning surfaces, do not pose the same risks.

Which of the following shows a chemical change?

• a. tearing up a notebook page

• b. folding a shirt

• c. baking a cake

• d. crumpling paper

Answer explanation

Baking a cake involves a chemical change as ingredients undergo a transformation, creating new substances like carbon dioxide and changing the structure of the batter. The other options are physical changes.

Liam tore a cardboard box into smaller pieces. What property of the cardboard changed?

• a. Its size and shape

• b. Its smell and feel

• c. Its color and feel

• d. Its feel and weight

Answer explanation

When Liam tore the cardboard box, he changed its size and shape by breaking it into smaller pieces. Therefore, the correct answer is a. Its size and shape.

Which of the following is the odd one out?

• a. halo-halo

• b. caesar salad

• c. pizza

• d. coffee

Answer explanation

Halo-halo is a dessert, while the other options (Caesar salad, pizza, coffee) are savory or beverage items. This makes halo-halo the odd one out.

What is a good method to separate a mixture of water and sand?

• a. Pick up the sand with your hand

• b. Use a magnet to collect the sand

• c. Use filter paper to separate the sand

• d. Wait until the water disappears

Answer explanation

The best method to separate water and sand is to use filter paper. This allows the water to pass through while trapping the sand, effectively separating the two components. Other options are impractical or ineffective.

Which of the following is not considered a force?

• a. gravity

• b. magnetism

• c. friction

• d. speed

Answer explanation

Speed is a measure of how fast an object moves and does not exert a force. In contrast, gravity, magnetism, and friction are all forces that can cause changes in motion.

During a storm, Leo saw lightning and then heard thunder a few seconds later. Why?

• a. Light moves more slowly than sound

• b. Sound reaches our ears faster than light

• c. Light travels faster than sound

• d. Light and sound move together

Answer explanation

The correct answer is c. Light travels faster than sound. This is why Leo saw the lightning before hearing the thunder, as light reaches our eyes almost instantly while sound takes longer to travel.

In cooking “bibingka,” heat is transferred using charcoal placed on top and bottom. What kind of heat transfer happens here?

• a. conduction

• b. radiation

• c. convection

• d. all of the above

Answer explanation

In cooking bibingka, heat transfer occurs through conduction (direct contact with the pan), radiation (heat from charcoal), and convection (air movement). Thus, the correct answer is d. all of the above.