Class 4 Science Chapter 5 Test 2 Updated: 12 Jun 2022 245 Welcome to your Class 4 Science Chapter 5 Test 2 1. _________ use echo to catch its prey in darkness. Rat Cat Bat None of these 2. Doctors usually measure temperature in _______ scale. Centigrade Fahrenheit Kelvin None of these 3. The symbol of degree centigrade is _______ 0F oC oD oCd 4. _______ is used to measure the hotness or coldness of an object. Temperature Energy Thermometer None of these 5. The instrument used to measure temperature is called ______. Temperature Energy Thermometer None of these 6. When the bulb of thermometer touches a cold object, the mercury or alcohol _______ Expands Contracts Both at same time None of these 7. To hear a clear echo, the reflecting surface should be at least _______meters away from the source of sound. 7 17 27 37 8. The sound reaches our ears through particles of the _______ Vacuum Light Air None of these 9. When sound bounces back from an object (reflects) at a certain distance and we hear it again, it is called ____. Real sound No sound Echo None of these 10. When the object is hot, its temperature _______ Increases Decreases Both at the same time None of these 11. Fahrenheit and degree centigrade are the units of _______. Hotness Coldness Temperature None of these 12. Heat always travels from _________ object. Cold to hot Hot to cold Hot to hot Cold to cold 13. When the object is cold, its temperature _______ Increases Decreases Both at the same time None of these Time's up
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