Everyday Science

Option: B
Explanation :The telescope is an instrument that collects and analyzes the radiation emitted by distant sources. The most common type is the optical telescope, a collection of lenses and/or mirrors that is used to allow the viewer to see distant objects more clearly by magnifying them or to increase the effective brightness of a faint object. In a broader sense, telescopes can operate at most frequencies of the electromagnetic spectrum , from radio waves to gamma rays.

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Option: A
Explanation :A space probe is a robotic spacecraft that does not orbit Earth, but instead, explores further into outer space. A space probe may approach the Moon; travel through interplanetary space; flyby, orbit, or land on other planetary bodies; or enter interstellar space.

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Option: C
Explanation :The technology used to check the human eye for refractive error and cornea is Land sat and skylab.
Landsat uses electronic sensors for repetitive observations with moderate ground resolution. The Skylab flights used a wider range of electro-optical sensors and returned film cameras with moderate and high ground resolution.
Refractive error means that shape of your eye does not bend light correctly, resulting in a blurred image. Some common types of refractive errors are myopia , hyperopia , presbyopia , and astigmatism.
The cornea is your eye’s protective outer layer. Along with the sclera (the white of your eye), it serves as a barrier against dirt, germs, and other things that can cause damage. Therefore The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber.

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Option: A
Explanation :STS-1 (Space Transportation System-1) was the first orbital spaceflight of NASA’s Space Shuttle program. The first orbiter, Columbia, launched on 12 April 1981 and returned on 14 April, 54.5 hours later, having orbited the Earth 36 times.

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Option: C
Explanation :Nitrous oxide (N2O), also called dinitrogen monoxide, laughing gas, or nitrous, one of several oxides of nitrogen, a colourless gas with pleasant, sweetish odour and taste, which when inhaled produces insensibility to pain preceded by mild hysteria, sometimes laughter.Nitrous oxide was discovered by the English chemist Joseph Priestley in 1772; another English chemist, Humphry Davy, later named it and showed its physiological effect.

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Option: C
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Option: A
Explanation :Metallic bonds can occur between different elements. A mixture of two or more metals is called an alloy. Depending on the size of the atoms being mixed, there are two different kinds of alloys that can form: 1. Substitutional alloy 2. Interstitial alloy

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Option: C
Explanation :Pea sized portions of potassium chlorate and red phosphorus are reacted together by striking with a hammer. Smoke, a loud bang and a flash are observed.

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Option: D
Explanation :Hydrogen and helium, the lightest two gases, weigh so little that helium balloons and hydrogen dirigibles are able to float in the atmosphere. Hydrogen is a diatomic gas, and helium is a monatomic gas. Both hydrogen and helium are lighter than air.

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Option: B
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