Class 4 Science Chapter 5 Test 2 Updated: 12 Jun 2022 64 Welcome to your Class 4 Science Chapter 5 Test 2 1. 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 2. The symbol of Fahrenheit scale is _______ 0F oC oFa oCd 3. Sound needs some _________ to travel. Vacuum Light Medium None of these 4. When the object is hot, its temperature _______ Increases Decreases Both at the same time None of these 5. Doctors usually measure temperature in _______ scale. Centigrade Fahrenheit Kelvin None of these 6. A hard and smooth object ________ sound better. Refracts Reflects Both a & b None of these 7. The symbol of degree centigrade is _______ 0F oC oD oCd 8. When the bulb of thermometer touches a hot object, the mercury or alcohol _______________ Expands Contracts Both at same time None of these 9. The sound reaches our ears through particles of the _______ Vacuum Light Air None of these 10. In thermometer, ______ present in its bulb. Mercury Alcohol Both a & b None of these 11. To hear a clear echo, the reflecting surface should be at least _______meters away from the source of sound. 7 17 27 37 12. The instrument used to measure temperature is called ______. Temperature Energy Thermometer None of these 13. _________ use echo to catch its prey in darkness. Rat Cat Bat None of these Time is Up! Time's up
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