Unit 5-9 MCQ Test

Look at the diagram showing the model of a helium atom.

• Protons and electrons are found in the nucleus

• Electrons are positively charged and in the nucleus

• Neutrons and protons are in the nucleus, electrons orbit it

• Protons orbit the nucleus, electrons are inside it

What holds the atom together?

• Attraction between protons and neutrons

• Gravity from the nucleus

• Electrostatic attraction between opposite charges

• Magnetic forces between electrons and protons

Which is the purest form of gold?

• 9 carat

• 18 carat

• 24 carat

• Gold alloy

A silver ring is marked 900. What does this mean?

• The ring is 90% silver

• 900 atoms in the ring are silver

• The ring contains 90 g of silver

• The ring is made only of silver and carbon

Look at the table showing salt content in 1000 g of seawater. What is the mass of sodium chloride in 1000 g of seawater?

• 3.5 g

• 35.0 g

• 0.35 g

• 350 g

Which statement correctly compares weather and climate?

• Weather is short-term; climate is long-term patterns

• Climate and weather mean the same thing

• Weather depends on sunlight only

• Climate changes every hour

Look at the table of daily temperatures. What kind of data is this?

• Climate data

• Weekly prediction

• Weather data

• Wind data

Look at the graph of Earth’s temperature over 400,000 years. What does the graph show about Earth’s climate?

• Always cold

• Random and unpredictable

• Cycles between warm and cold periods

• Climate only changed once

A light ray strikes a mirror at 30°. What is the angle of reflection?

• 0°

• 15°

• 30°

• 60°

What do you need to investigate light reflection?

• Tuning fork and mirror

• Laser, water tank, protractor

• Ray box, mirror, ruler, protractor

• Bunsen burner, prism, beaker