Class 4 Science Chapter 5 Test 2 Updated: 12 Jun 2022 656 Welcome to your Class 4 Science Chapter 5 Test 2 1. When the bulb of thermometer touches a hot object, the mercury or alcohol _______________ Expands Contracts Both at same time None of these None 2. To hear a clear echo, the reflecting surface should be at least _______meters away from the source of sound. 7 17 27 37 None 3. Fahrenheit and degree centigrade are the units of _______. Hotness Coldness Temperature None of these None 4. Heat is a form of ________. Matter Energy Coal Oil None 5. The sound reaches our ears through particles of the _______ Vacuum Light Air None of these None 6. _______ is used to measure the hotness or coldness of an object. Temperature Energy Thermometer None of these None 7. The instrument used to measure temperature is called ______. Temperature Energy Thermometer None of these None 8. When the bulb of thermometer touches a cold object, the mercury or alcohol _______ Expands Contracts Both at same time None of these None 9. Heat always travels from _________ object. Cold to hot Hot to cold Hot to hot Cold to cold None 10. Sound needs some _________ to travel. Vacuum Light Medium None of these None 11. The _________ present in our throat produce sound. vocal cards Mic system No cards Simple cards None 12. 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 None 13. When the object is cold, its temperature _______ Increases Decreases Both at the same time None of these None Time's up
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