2 ND FORM REVISION EXERCISE

Transcription

1 1 2 ND FORM REVISION EXERCISE Name: Form: 1. The human eye focuses on different objects at different distances by changing:- a. the position of the eye lens b. the position of the cornea c. the shape of the lens d. the shape of the cornea 2. The coloured portion of the eye is called the a. Retina b. Iris c. Pupil d. Cornea 3. The eye disease that is caused by a clouding of the lens of the eye is called a. Glaucoma b. Astigmatism c. Cataract d. Conjunctivitis 4. Which class of animal has skin with fur or hair, feeds their young milk and maintains a constant body temperature? a. Birds b. Mammals c. Reptiles d. Fish 5. The five classes of vertebrates are: a. Mammals, Marsupials, Monotremes, Birds, Frogs b. Mammals, Animals, Fish, Birds, Reptiles c. Mammals, Fish, Birds, Amphibians, Reptiles d. Vertebrates, invertebrates, birds, fish, reptiles

2 2 6. Fill in the blank spaces. 7.

3 3 8. The diagram below shows how the pupil of the eye looks in a dimly lit room. On the diagram F, show how the pupil will look in a brightly lit room. 1mark

4 marks How the ear works.. Sound waves enter the outer ear. They travel down the ear canal and make the eardrum vibrate. (The eardrum is a thin skin that stretches across the inner end of the ear canal.) The vibrations of the eardrum cause vibrations in the three little bones in the inner ear. These little bones vibrate a spiral-shaped organ called the "cochlea." The cochlea is filled with liquid and tiny hairs. Each hair has its own connection with a nerve that goes to the auditory nerve. Auditory means hearing. The auditory nerve sends a signal to the brain. 10. Directions: Answer the questions 1-9 below about the ear and how it works using the passage above. 1. As sound waves reach the ear they travel down the ear canal and makes what vibrate? 2. The eardrum is a thin skin that stretches across the of the ear. 3. What do sound waves cause the eardrum to do? a. vibrate b. stretch c. hear

5 5 4. What is located inside the cochlea? a. liquid and tiny bones b. liquid and tiny hairs 5. What are the three little bones are located in the inner ear called. 3marks 6. Auditory means?. 1 mark 7. The auditory nerve sends messages to the a. brain b. eardrum b. 8. Sound travels fastest through a) liquids c) a vacuum b) air d) solids 9. Frequency is measured in units called a) hertz c) centimeters b) watts d) joules 10. Forms of Energy Continued Directions: Match the energy form(s) to the description provided. A few questions may have more than one answer. 1. Falling rocks from the top of a mountain 2. Release of energy from the Sun 3. Energy released from food after it is eaten 4. Batteries 5. The energy that runs a refrigerator 6. Nuclear fission reactors 7. The rumble of thunder from a storm (a) Mechanical (b) Electrical (c) Heat (d) Radiant (e) Chemical (f) Nuclear (g) Sound 8. Rubbing your hands together 9. Gasoline

6 6 10. Food before it is eaten 11. Lightening 10.b Transformation of Energy Directions: Use the following forms of energy to fill in the table below: mechanical, electrical, heat, radiant, chemical, nuclear, and sound. The first one has been done for you. ORIGINAL ENERGY FORM FINAL ENERGY FORM 1. Electric motor electrical mechanical 2. A battery that runs a moving toy 3. A solar panel on the roof of a house 4. A person lifting a chair 5. A nuclear power plant 6. A toaster 7. A church bell 8. Gasoline powering a car 9. A light bulb 10. Photosynthesis 11.Problem: On January 1, the meter looked like this: On January 31, the meter looked like this:

7 How many kilowatt-hours of electricity were used during January? 7 If the cost of electricity in Denver is $.089 per kwh, how much did electricity cost for January? Our world is made up of three states of matter. What are they? 14. Draw a diagram to represent 8 particles in each state of matter. SOLID LIQUID GAS

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