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Q:

# What is refractive index ?

 A) it is defined as the ratio of speed of light in the medium to the speed of light in vacuum. B) it is defined as the product of speed of light in medium and in vacuum. C) it is defined as the ratio of speed of light in vacuum to the speed of light in the medium . D) None of above

Answer:   C) it is defined as the ratio of speed of light in vacuum to the speed of light in the medium .

Explanation:
Subject: Physics
Q:

Lens is made up of which glass

 A) Ordinary glass B) Pyrex glass C) Flint glass D) Cobalt glass

Answer & Explanation Answer: C) Flint glass

Explanation:
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Q:

Malleability and Ductility of metals can be accounted due to

 A) the crystalline structure in metal B) the interaction of electrons with metal ions in the lattice C) the presence of electrostatic force D) the capacity of layers of metal ions to slide over the other

Answer & Explanation Answer: D) the capacity of layers of metal ions to slide over the other

Explanation:
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Q:

Light travels fastest in

 A) Air B) Water C) Glass D) Diamond

Answer & Explanation Answer: A) Air

Explanation:

Light travels fastest in Vacuum. The fastest thing in the whole universe is the speed of light in a vacuum like outer space. It is about 2.99 x 108 m/s.

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Q:

How many bottles of water is a gallon?

 A) 16 B) 8 C) 4 D) 2

Answer & Explanation Answer: B) 8

Explanation:

The easiest way would measure it through half a liter water bottle. There are approximately 16.9 ounces(oz) of water in a 500ml water bottle.

Gallon is an imperial customary volume unit for the U.S.

As we have previously mentioned, the 16.9oz bottle is also known as 500ml in the metric system. According to U.S. standard, 1 gallon stands for 128 fluid oz.

Hence, Number of bottles in 1 gallon = 128/16.9 = 7.57 =~ 8.

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Q:

Sound travels fastest in

 A) Vacuum B) Air C) Glass D) Water

Answer & Explanation Answer: C) Glass

Explanation:

Sound is a mechanical vibration and needs a medium for propagation. The higher the density of the medium, the faster the sound travels. So, sound cannot travel through vacuum.

As the sound travels faster in solids than liquids and gases, sound travels faster in the glass than Air and water.

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Q:

In which layer is the pressure the highest?

 A) Ionosphere B) Stratosphere C) Troposphere D) Inner core

Answer & Explanation Answer: D) Inner core

Explanation:

"Pressure" is the ratio of mass to area. So, for any given area, the one with more mass pressing on it will experience a higher pressure.

As you go more deeply into the atmosphere OR earth itself, you are putting more and more mass over you. For the same unit area therefore, the pressure, (mass/area) increases.

Hence, the lowest layer will always have the highest pressure i.e, inner core.

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Q:

A periscope works by the principle of

 A) Total internal reflection B) Refraction C) Diffraction D) Reflection & Refraction

Answer & Explanation Answer: A) Total internal reflection

Explanation:

A periscope is an optical instrument that uses a system of prisms, lenses, or mirrors to reflect images through a tube.

Light from a distant object strikes the top mirror and is then reflected at an angle of 90 degrees down the periscope tube. At the bottom of the periscope, the light strikes another mirror and is then reflected into the viewer’s eye.

Hence, A periscope works by the principle of Total internal reflection.

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Q:

Sound following a flash of lightning is called

 A) Stoning B) Bolting C) Thunder D) Cloud clash

Answer & Explanation Answer: C) Thunder

Explanation:

The Sound Following the flash of lighting is because of Thunder.

Lightning is seen earlier than thunder because light travels much faster than sound.

The roar of thunder is the result of a shock wave produced when lightning super-heats the air through which it passes, causing that air to expand very rapidly. This rapid expansion of air creates a shock wave that travels outward at close to the speed of sound.

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