Department of Science 2018-2019 Revision Worksheet Answer Key Topic: Physics L- 4.1, 4.2 and 4.3 Grade 4... Name:... Date:.../11/2018 Q.1. Fill in the blanks. 1) Sound is produced by vibrations. 2) Sound travels in waves. 3) Sound cannot travel through vaccuum. 4) Sound travels best through solids. 5) Sound level or loudness of sound is called volume. 6) What is the unit of sound level, or volume? decibels. Q.2. Choose the correct answer. 1-Sound level or volume is measured by which instrument?... a) Thermometer b) sound level meter c) measuring tape. 2- Loud sounds over a longer period of time can damage your ears.... a) True b) false 3- An object that produces sound is called the... of sound b) source b) place c) medium 4- Ali investigates the change of sound levels with distance. For a fair test what factors should he keep the same? a) Distance and source of sound. b) Sound meter and source of sound. c) Distance and sound meter.
Q.2. Here are some of the speeds at which sound travels through different media. Medium Air Water Steel Speed of sound 330 m/s 1430 m/s 3600 m/s a) Sound travels at a speed of 1430 m/s through the liquid. b) Sound travels slowest through which medium? Air c) Sound travels faster in air than in water. True or False? False Q.3. Jack covered a bowl with thin plastic cling wrap. He then placed some paper balls on top. He played the radio close to it. What makes the paper balls on the drum to move? a) Vibration due to sound b) Attraction between the balls. Q.4. The table below shows a tally chart for a sound survey. Type of sound Tally marks Total Mechanical 7 Living things 13 Natural 3 a) Find the total number of sounds heard for each type. Complete the table. b) Draw the graph using tally chart. Label it neatly. 14 c) Which sound is most popular? Living things 12 10 8 d) In which area is the sound survey taken place? 1- City 2- Rural area. 6 4 2 Mechanical Living things Natural
Q.5. The string telephone works better with tight string because... a) Vibrations can travel through tight string. b) Loose string makes the waves shorter. Q.6. In the string telephone some of the sound vibrations will be transmitted away from the string when the vibration travels through the string. So which will work better? a) Shorter string b) Longer string Note: If the string is kept tight, the sound waves will travel. If the string is loose, the sound is less. This is because the lose string causes the vibrations to travel all around rather than directly down the string. Try experimenting with different lengths of string, types of string, and types of cups to see which produces the best sound over the longest distance. Q.7. Look at the experiment below and answer the questions below. 1- In 1658, the Irish scientist, Robert Boyle, did experiments to investigate how we hear sounds. 2- He placed a clock in a glass jar and slowly pumped out all the air. 3- He could not hear the clock ticking anymore. 4- What was the conclusion of his experiment? Ans: Sound needs a medium to travel. Sound cannot travel through vaccuum.
Q.8. Look at the decibel scale and answer the questions. a- Name two soft sounds: rustling leaves and whisper b- Name two sounds that can damage your ear: fireworks and jet engine c- What is the volume of city traffic? 70 db Grade 4... First Term revision worksheet - 10 Answer Key Date: / /2018 Q.1. Choose the correct answer. Topic: Skeletons L-1.1, 1.2, 1.3, 1.4, 1.5 1) Which animal below is a mammal? a) Turtle b) snake c) eagle d) bear 2) What are vertebrates? a) Animals with a backbone b) Animals without a backbone 3) My body is moist and smooth; I lay eggs, and live in or out the water. Who am I? a) Amphibian b) reptile c) fish d) bird 4) All insects have. Legs. a) 6 b) 8 c) 10 d) 4 5) Is the picture a vertebrate or invertebrate? a) Vertebrate b) invertebrate 6) Which of the following has an exoskeleton? a) Birds b) crab c) fish d) giraffe 7) Place where two or more bones meet. a) joint b) marrow c) calcium 8) Which of the following is NOT a job of the skeleton? a) Support and give shape to the body. b) Makes blood cells c) Removes waste from the body
9) These connect muscles to bones. a) Ligaments b) joints c) tendons 10) What protects the spinal cord? a) Skull b) rib cage c) vertebral column 11) How many bones are there in an adult human skeleton? a) 300 b) 206 c) 106 d) 66 12) The rib cage protects your: a) Liver b) Heart c) Lungs d) All the above. 13) Each bone that makes up the back bone is called a. a) vertebra b) Vertebrates c) Invertebrates d) Scale 14) The human spine is an example of an.... a) Endoskeleton b) Exoskeleton 15) Soft, flexible material by which a baby s bones are made is called... a) cartilage b) marrow c) spine 16) Group the given animals Fish Lady bug Elephant Slug Lobster Snail No skeleton External skeleton Internal skeleton slug snail fish lady bug elephant lobster
17) Match the following: 1 Skull bone 4 Shock absorber 2 Back bone 1 22 bones 3 Ligament 2 33 vertebrae 4 Rubbery cartilage 3 Joins bone to bone 18) Label the bones of the human skeleton. Use some words from the box. upper arm bone, pine, elbow, thigh bone, skull, ribcage, hip bone, kneecap, elbow ribcage hip bone thigh bone knee cap 19) Compare the two x-rays below. a- Which picture shows the bones of a child s hand? Picture A Picture A Picture B Picture B b- Give reason for your analysis:... The bones in... picture A are smaller....... Children have smaller bones.... The bones in picture B are longer.
UNITED ARAB EMIRATES ROSARY SCHOOL / HALWAN Licensed from the Ministry of Education Under No. (50) دولة االمارات العربية المححذة مذرسة الوردية الخاصة / حلوان المرخصة مه وزارة الحربية و الحعليم جحث رقم )50 ) Department of Science 2018-2019 Grade: 4... First Term revision worksheet - 11 Date: / /2018 Choose the correct answer. Topic: States of matter L- 3.1 and 3.2 1) The particles in a... are freely moving. a) Liquid b) solid c) gas 2) A form of matter that has a definite shape and volume is a solid. a) True b) false 3) The volume of a.. depends on the size of the container. a) Solid b) liquid c) gas 4) Rashid investigated properties of some materials. Here are his observations. Identify the state of matter from its properties. Materials Properties Solid/liquid/gas 1 2 3 Does not flow. Does not change its shape. Has fixed volume. Spreads in all directions. Takes up all space available. Takes the volume of the container. Flows from a higher level to lower level. Has no definite shape and takes the shape of the container. Has fixed volume. Solid Gas Liquid 5) Identify the states of matter in the following. a) Bottle filled with water. Bottle:..., solid Water:.. liquid b) Hot air balloon Balloon:......, solid Hot air:.... gas c) Baked bread Bread:... solid Pockets of air:... gas d) Bottle of shampoo Bottle:... solid shampoo:... liquid e) Milk and cereal Milk:... liquid cereal:... solid
6) Look at the model of the water cycle. a- What is the use of the electric lamp? 1- To give light. 2- To provide heat for evaporation. b- Ice cubes kept on the box lid speed up which process in water cycle? 1- Condensation 2- Evaporation 3- Melting 7) Name the three states of water. a) Solid:..... ice b) Liquid: water c) Gas: water vapour 8) Look at the molecules in the picture below. a b c Identify the states of matter from the molecular arrangement a)... solid b) liquid c). gas
9) Look at the picture of the water cycle below and label it. condensation precipitation evaporation SEA collection a- Name the processes in the water cycle. 1- Change of water to water vapour:. evaporation 2- Change of water vapour to water:. condensation 3- Water falls back to the earth:.... precipitation 4- Water in rivers, streams, etc.:... collection b- Complete the story of how water moves from sea, to the atmosphere and lands back on land. Firstly the water starts off in the s ea it then is transferred to the air by the process of e. vaporation This is because the sun heats the water and it turns into water. vapour The water vapour then cools or c ondenses to form clouds. The tiny droplets of water join together, become heavy and fall back to the earth as, rain sleet, snow, etc. This is called p. recipitation The water c ollects in oceans, s, treams r ivers, etc.