D. A. Test Questions 04-01-10

• 1. In both examples, the load exerts a downward force of 30 Newtons. Student A uses a fixed pulley to lift the board a distance of 10 meters. Student B uses a pulley system to lift the board a distance of 10 meters. Which of the following statements is true?

• A. Both students apply the same amount of force.

• B. Student A applies less force and pulls the rope a shorter distance.

• C. Student B applies less force and pulls the rope a longer distance.

• D. Student B applies less force and pulls the rope a shorter distance.

2. Which of the following accurately describes the work done by Student A and Student B?

• A. Student A did more work than Student B.

• B. Student B did more work than student A.

• C. Both students did the same amount of work.

• D. The pulleys reduced the amount of work that was done.

3. Suppose the box exerts a downward force of 50 Newtons and the board is 3 meters long. A man wishes to

use the lever to lift the box. How can man reduce the

amount of force he needs to apply?

• A. Apply an upward force to the box with his hands.

• B. Reduce the friction between the box and the board.

• C. Move the fulcrum as close to the box as possible; apply a downward force to side B.

• D. Move the fulcrum as close to side B as possible; apply a downward force to side B.

4. Suppose the man wanted to use the lever to lift the box as high as possible.

How could he accomplish this task?

• A. Move the fulcrum as close to side A as possible; apply less than 50 Newtons of force to side A.

• B. Move the fulcrum as close to side B as possible; apply more than 50 Newtons of force to side B.

• C. Apply an upward force between the fulcrum and side B.

• D. Apply a downward force between the fulcrum and side A.

5. The golf ball in the illustration is resting on the tee. Which of the following statements is

false? • A. The tee pushes up

on the ball.• B. The ball pushes

down on the tee.• C. No forces are

acting on the ball.• D. All of the forces

acting on the ball are balanced.

6. The bowling ball in the illustration moves in a straight line down the right side of the lane then suddenly curves to the left and strikes the pin in

front. What causes the ball to change its direction?

• A. The bowling pin exerts an opposing force on the ball.

• B. One or more unbalanced forces act on the ball.

• C. The forces acting on the ball increase.• D. No forces act on the ball.

7. What will happen to machine if the boy applies a constant force to the lawnmower

in the same direction?• A. The machine will

change its direction and speed up.

• B. The machine move in a straight line at a constant speed.

• C. The machine’s speed will decrease unless the boy increases his force.

• D. The machine will move in a straight line and its speed will increase steadily.

8. Which of the following statements best describes why the ball thrown on Earth

changes its speed and direction?

• A. The ball has less mass in space than on Earth.

• B. No unbalanced forces act on the ball in space.

• C. The only forces acting on the ball on Earth are balanced forces.

• D. Friction and gravity acted on the ball on Earth.

9. When magnesium, sulfur, and oxygen combine chemically, they form magnesium sulfate, a

substance used to make bath salts. Magnesium, sulfur, and oxygen must be ___.

• A. Solids

• B. Solutions

• C. Elements

• D. Mixtures.

• Photosynthesis

6H2O + 6CO2 C6H12O6 + 6O2(water) (carbon dioxide) (glucose) (oxygen)

• 10. Which of the substances above is not a compound?

• A. Water• B. Carbon dioxide• C. Glucose• D. oxygen

11. Which of the body’s systems is responsible for delivering nutrients to the

cells of the body?

• A. The skeletal system

• B. The excretory system

• C. The digestive system

• D. The circulatory system

12. Which of the following statements is supported by the information in the table

above?

• A. Sulfur is found only in organic compounds.

• B. Carbon is found only in organic compounds.

• C. Carbon is found in all of the organic compounds.

• D. If a compound does not contain hydrogen, it is not organic.

13. What is the body’s first line of defense against invaders

such as viruses and bacteria?

• A. The skeletal system

• B. The muscular system

• C. The circulatory system

• D. The integumentary system

14. Which element that composed the compounds in the venn diagram would be

located in the area indicated by the letter X?

• H2O water

• NH3 ammonia

• NaOH baking soda

• A. Sodium• B. Oxygen• C. Nitrogen• D. hydrogen

15. Which of the body’s system is responsible for producing red blood cells?

• A. The skeletal system

• B. The immune system

• C. The respiratory system

• D. The circulatory system

16. Which of the following is the most important function of the kidneys?

• A. To digest food

• B. To eliminate excess water

• C. To filter substances from blood.

• D. To regulate body temperature.

17. A man watches as his wife eat a sour lemon. The man feels a sudden painful

contraction in his jaw. The pain disappears a few seconds later. What is the most likely

cause of the unpleasant sensation?

• A. A response to an external stimulus• B. A response to an internal stimulus• C. A cavity in his tooth• D an upset stomach

18. If human is exposed to cold temperatures, his blood moves away from

his feet and hands. How is this response of greatest benefit to the person?

• A. He remembers to put on shoes and gloves.• B. He feels warmers when his hands and feet

are cold.• C. There are fewer nerves in the handes and

feet to sense the cold.• D. the movement maintains his internal body

temperature.

19. When a bird such as a penguin is exposed to cold temperatures, its body automatically responds by puffing up its feather, trapping a layer of air next to its skin. This helps the bird to maintain a constant temperatures. Which of the

following the most similar automatic response to cold in humans?

• A. Building a fire

• B. Putting a on a jacket

• C. Drinking a hot liquid

• D. Forming goose bumps

20. Which of the following is the likely reason why most humans do not make

similar extreme adjustment?

• A. The human environment does not change.• B. Humans cannot detect changes in the

environment.• C. A human’s body temperature changes with

the environment.• D. Humans often adjust the environment to

meet their needs.

21. When one’s body runs a fever, the need to urinate usually increases as

well. How does this response help to restore homeostasis?

• A. The person loses excess water.• B. It makes the kidnew work harder.• C. Urine removes excess heat as it leaves

the body.• D. It prevents the person from staying in

bed too long.

22. Food poisoning may occur when we eat food that is contaminated with a bacteria.

Which of the following is the body’s protective response to E. Coli?

• A. Itching

• B. Fever

• C. Vomiting

• D. sneezing

23. Which of the following describes a response to an internal stimulus?

• A. A girl feels dizzy at lunch time when she skips breakfast.

• B. A baby cries when his mother leaves the room.

• C. A boy jumps when he hears a balloon pop.• D. A cook’s eyes water when he cuts an onion.

24. While attending a swim meet, a team member’s body reacts to attempt to maintain

homeostasis. Which of the following describes a response to an internal

stimulus?

• A. Jumping at the sound of the start signal• B. Shivering from cold after leaving the water.• C. Developing a muscle cramp during a race.• D. Developing a sunburn from overexposure to

the sun.