**Water is heated in a kettle. The inside water is heated by convection. A person sitting near the fire receives heat by:**A) ConductionB) ConvectionC) RadiationD) Reflection Show Answer Correct Answer: C – Radiation
**The measurement of rainfall is made by an instrument known as:**A) HygrometerB) BarometerC) HydrometerD) Rain gauge Show Answer Correct Answer: D – Rain gauge
**Light year is a unit of:**A) DistanceB) Time periodC) Light intensityD) Speed Show Answer Correct Answer: A – Distance
**Three elements needed for the healthy growth of plants are:**A) Nitrogen, Phosphorus, PotassiumB) Nitrogen, Carbon, PhosphorusC) Nitrogen, Potassium, CalciumD) Nitrogen, Sulfur, Phosphorus Show Answer Correct Answer: A – Nitrogen, Phosphorus, Potassium
**Copper can be converted into gold by:**A) HeatingB) Artificial RadioactivityC) ElectroplatingD) Chemical Reaction Show Answer Correct Answer: B – Artificial Radioactivity
**In winter an iron pipe feels colder than a wooden window. This is because wood is:**A) ConductorB) Non-ConductorC) Semi-ConductorD) Not a solid while iron is a solid Show Answer Correct Answer: B – Non-Conductor
**The echo (reflected sound) will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least:**A) 1120 ftB) 120 ftC) 56 ftD) 100 ft Show Answer Correct Answer: C – 56 ft
**It is possible to recognize a person in the dark by simply hearing his unique voice. It is because of the:**A) PitchB) FrequencyC) Time periodD) Quality Show Answer Correct Answer: D – Quality
**When a ray of sunlight enters a dark room, its straight path becomes visible because of dust particles hanging in the air. This is because dust particles are:**A) VisibleB) TransparentC) OpaqueD) Invisible Show Answer Correct Answer: C – Opaque
**A six feet tall lady wants to see her full image in a plane mirror. The minimum length of the mirror will be:**A) 6 feetB) 12 feetC) 4 feetD) 3 feet Show Answer Correct Answer: D – 3 feet
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