Everyday Science MCQs

Page No. 109

The primary function of the feathers in birds is to _________?


aProvide insulation for preserving body heat

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bProvide striking surface to the wings for flying

✓


cMake the body surface waterproof

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dimpart coloration for species as well as sex recognition

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What is ‘Stealth Technology‘?


aA device which when attached to an aircraft makes it invisible on the radar

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bA coating which reduces the visibility of an aircraft on radar

✓


cA Technology by which it is possible for the aircraft’s to spy in the enemy air-space

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dA technology by using which paratroopers can be dropped stealthily behind the enemy columns.

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Bats can also fly in dark because they are capable of taking the help of _________?


aUltraviolet Waves

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bUltrasonic Waves

✓


cElectromagnetic Waves

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dSpecial Retina

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View Answer Ultrasonic Waves

The Green House Effect is caused by an excess of ?


aCarbon dioxide

✓


bCarbon monoxide

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cCarbon tetrachloride

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dNone of the above

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View Answer Carbon dioxide

T.V. transmission cannot cover a very large area because


athe strength of T.V. waves is very limited

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bpicture cannot be transmitted clearly after a specific distance

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cthe shape of the earth is spherical

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dthe air is not a good conductor of light and sound/waves

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The cow’s milk contains how much amount of water in terms of percentage?


a60%

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b65%

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c72%

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d80%

✓


View Answer 80%

An iceberg is floating in sea. How much of its mass will remain above the surface of water?


aOne tenth

✓


bOne fifth

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cOne fourth

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dOne third

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View Answer One tenth

An astronaut inside a spacecraft is in a state of weightlessness. This implies that?


aThe mass of the astronaut is reduced to zero

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bGravity inside the spacecraft ceases to act

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cThe astronaut is outside the influence of the earth’s gravitational force

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dThe astronaut and the spacecraft are both in a free-failing state

✓



The sun appears red at sunrise and sunset while it appears white at noon, because


aOf refraction

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bIt is cooler at sunrise and at sunset

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cOf diffraction leading to red end of the spectrum reaching the earth.

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dOf Scattering of light due to dust particles and air molecules.

✓



A lake starts freezing because of the cold atmosphere. It will first freeze


aAt the bottom

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bln the middle pan

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cAt the top surface

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dUniformly throughout the water body

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View Answer At the top surface

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