GED Practice Test: Video 1 Answers (25 Questions) Flashcards

What is 15% of 80?

Answer: 12

10% of 80 is 8 and 5% is 4, so 15% is 12. Choosing 10 or 16 comes from mis-adding the 10% and 5% pieces.

Solve for x: 3x + 5 = 20.

Answer: 5

Subtracting 5 gives 3x = 15, so x = 5. Answer 15 forgets to divide by 3.

What is 3/4 + 1/8?

Answer: 7/8

3/4 equals 6/8, and 6/8 + 1/8 = 7/8. Adding tops and bottoms (4/12) is a common mistake.

What is the slope of the line y = 2x - 3?

Answer: 2

In y = mx + b, m is the slope, so the slope is 2. The value -3 is the y-intercept, not the slope.

What is the average of 4, 8, and 12?

Answer: 8

4 + 8 + 12 = 24, and 24 divided by 3 is 8. Ten would be the average of 8 and 12 only.

What is 2 to the fifth power?

Answer: 32

2 x 2 x 2 x 2 x 2 = 32. Ten comes from multiplying 2 by 5 instead of using an exponent.

A $40 jacket is on sale for 25% off. What is the sale price?

Answer: $30

25% of 40 is 10, so the sale price is 40 - 10 = $30. Answer $10 is only the discount amount.

What is the main idea of a passage?

Answer: The central point the author wants to convey

The main idea is the central message the whole passage develops. Supporting details only back it up and are not the main idea.

Which sentence uses the correct word?

Answer: They're going to the store later.

They're is the contraction of 'they are', which fits the sentence. 'Their' shows possession and 'there' points to a place.

A character slams the door and clenches her fists. What can you infer?

Answer: She is angry

Slamming a door and clenching fists are signs of anger. Delight or sleepiness would not be shown this way.

Which choice fixes the comma splice? 'I was tired, I went to bed.'

Answer: I was tired, so I went to bed.

Adding a comma plus 'so' correctly joins the independent clauses. Removing the comma entirely creates a run-on.

An author lists facts and urges readers to vote. What is the likely purpose?

Answer: To persuade

Urging readers to take action signals a persuasive purpose. Entertainment would rely on humor or story, not a call to vote.

Which sentence has correct subject-verb agreement?

Answer: The dogs bark loudly.

'Dogs' is plural, so the verb 'bark' is correct. 'Dogs barks' mismatches number.

What gas do plants take in during photosynthesis?

Answer: Carbon dioxide

Plants absorb carbon dioxide and release oxygen. Oxygen is the product, not the input.

Newton's first law says an object at rest stays at rest unless what happens?

Answer: An unbalanced force acts on it

An object changes its motion only when an unbalanced force acts on it. Time or temperature alone does not change motion.

In DNA, which base pairs with adenine?

Answer: Thymine

In DNA, adenine pairs with thymine. Uracil replaces thymine only in RNA, which makes it a tempting wrong choice.

What charge does an electron carry?

Answer: Negative

Electrons carry a negative charge, protons are positive, and neutrons are neutral.

In an experiment, what is the independent variable?

Answer: The factor the scientist changes

The independent variable is what the experimenter changes. The measured result is the dependent variable.

Which is an example of a chemical change?

Answer: Iron rusting

Rusting makes iron oxide, a new substance. Melting, tearing, and dissolving change form only.

Which principle divides government into legislative, executive, and judicial branches?

Answer: Separation of powers

Separation of powers splits authority among three branches. Federalism divides power between national and state governments.