Primary 4 Science Chapter 5

What does the term 'reflect' mean?

• To move in an orbit

• To create shadows

• The action of light bouncing off a surface

• To absorb light

Answer explanation

The term 'reflect' refers to the action of light bouncing off a surface. This is the correct choice, as it directly describes the physical phenomenon of reflection, unlike the other options which do not accurately define the term.

What is a 'ray' in terms of light?

• A shadow cast by an object

• A line that light travels in

• A diagram of light

• A type of mirror

Answer explanation

A 'ray' in terms of light refers to a line that light travels in. It represents the direction and path of light, distinguishing it from other options like shadows or diagrams.

What is the definition of 'source'?

• Where something comes from

• A vehicle for space travel

• A type of asteroid

• The action of light bouncing

Answer explanation

The term 'source' refers to the origin or starting point of something, making 'where something comes from' the correct definition. The other options do not relate to this meaning.

What does 'absorb' mean?

• To reflect light

• To create a shadow

• To take in a substance

• To move in a circle

Answer explanation

The term 'absorb' means to take in a substance, such as when a sponge soaks up water. The other options do not accurately describe this action.

What is a 'comet'?

• A type of spacecraft

• A lump of ice and dirt moving in orbit

• A model of the Earth

• A rocky mass that orbits the Sun

Answer explanation

A comet is best described as a lump of ice and dirt moving in orbit around the Sun. This distinguishes it from spacecraft, Earth models, and rocky masses like asteroids.

What does 'orbit' refer to?

• The action of light bouncing off a surface

• The movement of a body in space around a larger body

• A vehicle for space travel

• A type of asteroid

Answer explanation

'Orbit' refers to the movement of a body in space around a larger body, such as a planet orbiting a star. This definition distinguishes it from other options like light reflection or vehicles.

What is the meaning of 'solar system'?

• A diagram of light

• A model of the Earth

• A type of spacecraft

• The Sun and the planets, moons, comets, and asteroids around it

Answer explanation

The term 'solar system' refers to the Sun and all celestial bodies that orbit it, including planets, moons, comets, and asteroids. This definition encompasses the correct choice, distinguishing it from the other options.

What does 'spacecraft' mean?

• A vehicle for travelling in space

• A type of asteroid

• A model of the Earth

• A diagram of light

Answer explanation

A 'spacecraft' is defined as a vehicle designed for travel in space, making the first answer choice correct. The other options refer to unrelated concepts.

What is the 'axis' in terms of rotation?

• A type of spacecraft

• A rocky mass that orbits the Sun

• An imaginary line around which something spins

• A model of the Earth

Answer explanation

The 'axis' refers to an imaginary line around which an object rotates. This concept is fundamental in understanding rotational motion, distinguishing it from other options like spacecraft or celestial bodies.

What does 'tilted' mean?

• A type of shadow

• At an angle, not vertical

• The action of light bouncing

• Moving in a circle

Answer explanation

'Tilted' means something is positioned at an angle rather than being vertical. This definition aligns with the correct answer choice, which describes the orientation of an object that is not standing straight up.