**The principle used in radar is the same as that of Sonar. In radar we use radio waves while in Sonar we use:**A) Red WavesB) Infrared WavesC) Ultrasonic WavesD) Supersonic Waves Show Answer Correct Answer: C – Ultrasonic Waves
**A body can escape the gravitational pull of the earth if it is thrown up with a velocity of:**A) 25 miles/secB) 60 miles/secC) 7 miles/secD) 10 miles/sec Show Answer Correct Answer: C – 7 miles/sec
**In a fission nuclear reaction, a heavy nucleus breaks up into smaller nuclei whereas in another nuclear reaction two or more nuclei combine to form a heavy nucleus. This reaction is called:**A) Chemical ReactionB) Nuclear ReactionC) Nuclear FusionD) None of these Show Answer Correct Answer: C – Nuclear Fusion
**Night vision is possible with the help of:**A) Red LightB) Violet LightC) Infrared RaysD) Ultraviolet Light Show Answer Correct Answer: C – Infrared Rays
**Parsec is a unit of:**A) EnergyB) TimeC) PowerD) Distance Show Answer Correct Answer: D – Distance
**Myopia is a defect of human eye. It can be corrected by using a lens called:**A) Convex LensB) Concave LensC) Cylindrical LensD) Plano-convex Lens Show Answer Correct Answer: B – Concave Lens
**German Silver is an alloy of:**A) Zinc and NickelB) Copper and ZincC) Copper and NickelD) Copper and Tin Show Answer Correct Answer: C – Copper and Nickel
**Walnuts can be broken in the hand by squeezing two together but not one. It is because of:**A) Work doneB) PowerC) EnergyD) Force Show Answer Correct Answer: D – Force
**The Continent Antarctica lies at the:**A) North PoleB) South PoleC) Middle of the EarthD) Equator Show Answer Correct Answer: B – South Pole
**The temperature of the dead body is:**A) 0°CB) 37°CC) Room temperatureD) Temperature of the place where it is Show Answer Correct Answer: D – Temperature of the place where it is
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