**The principle used in radar is the same as that of sonar. In radar, we use radio waves, whereas in sonar, we use:**A) Red wavesB) Infrared wavesC) Ultrasonic wavesD) Supersonic waves Show Answer Correct Answer: C – Ultrasonic waves
**An ionic bond between two atoms is:**A) Complete transfer of valence electronsB) Half transfer of valence electronsC) Complete transfer of electronsD) None of these Show Answer Correct Answer: A – Complete transfer of valence electrons
**How is dengue fever transmitted?**A) Bite of an infected mosquitoB) Bite of an infected male Aedes mosquitoC) Bite of an infected female Anopheles mosquitoD) Bite of an infected female Aedes mosquito Show Answer Correct Answer: D – Bite of an infected female Aedes mosquito
**The sky is blue because of:**A) Rayleigh scatteringB) ReflectionC) Mie scatteringD) Absorption Show Answer Correct Answer: A – Rayleigh scattering
**Cyclones:**A) Experience Coriolis effects that deflect air to the right in the Southern HemisphereB) Are associated with super geotropic windsC) Are typically regions of fair weatherD) Are associated with low-pressure systems Show Answer Correct Answer: D – Are associated with low-pressure systems
**Rainbow formation is due to:**A) Absorption of sunlight by water dropletsB) Diffusion of sunlight through water dropletsC) Ionization of water dropletsD) Refraction and reflection of sunlight by water droplets Show Answer Correct Answer: D – Refraction and reflection of sunlight by water droplets
**The layer of the atmosphere in which the ozone layer lies is:**A) ExosphereB) MesosphereC) TroposphereD) Stratosphere Show Answer Correct Answer: D – Stratosphere
**Which distance is bigger—an astronomical unit (AU) or a light-year (LY)?**A) An astronomical unit (AU)B) Neither one is a measurement of distanceC) They’re both about the same distanceD) A light-year (LY) Show Answer Correct Answer: D – A light-year (LY)
**The rotation in which the Earth rotates is from:**A) West to eastB) East to westC) North to southD) South to north Show Answer Correct Answer: A – West to east
**Blood contains:**A) Red blood cellsB) White blood cellsC) PlateletsD) All of these Show Answer Correct Answer: D – All of these
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