Explanation

The intensity of earthquake is measured by Richter Scale.

Richter Scale was invented in 1935.

Explanation

Cooking gas, also known as liquified petroleum gas (LPG), is a mixture of propane and butane.

It is a flammable mixture of hydrocarbon gases.

Explanation

• Sunlight is a good source of vitamin D.
• When our skin is exposed to sunlight, it produces vitamin D.
• It is essential for bone health, immune function, and the regulation of calcium levels in the blood.

Explanation

One of the early signs of vitamin A deficiency is night blindness (nyctalopia).

while

Vitamin K deficiency leads to uncontrolled bleeding during an injury.

A deficiency of Vitamin D results in Rickets

Explanation

Because sound is just vibrating air, space has no air to vibrate and therefore no sound in a vacuum.

Sound waves below 20 Hz are known as infrasound.

Sound waves above 20 kHz are known as ultrasound

Sound waves transmit a medium such as a gas, liquid, or solid.

• The speed of sound in air is about 343 meters per second
• The sound travels at 1,481 m/s in water 
• The speed of sound in a vacuum is zero meters per second.

Explanation

• Humidity in the air was measured by a Hygrometer.
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• A hygrometer is an instrument used to measure relative humidity.
• Humidity is the measure of the amount of moisture in the air.
• A psychrometer is an example of a hygrometer.
• hygrometer.
  
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• The humidity in the air tells us about the ratio of Water vapors in the air

Explanation

Aluminum is the most abundant metal in the Earth's crust.

It comprising about 8% of its weight.

It is primarily found in the form of bauxite ore.

Explanation

• 60-80 is the normal pulse rate of adult.
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• A normal resting heart rate for adults ranges from 60 to 100 beats per minute.
• A normal resting heart rate should be between 60 to 80 beats per minute, but it can vary from minute to minute.
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Explanation

The theory of relativity usually encompasses two interrelated theories by Albert Einstein:

special relativity and general relativity, proposed and published in 1905 and 1915

E =mc2

 C in this equation Velocity of light

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Principle of Theory of relativity

ND27122022

Explanation

The longest bone is the Femur (thigh bone) and the shortest one is the Stapes (one of the 3 small bones inside the ear).

The largest and broadest is the hip bone or pelvis.

The lowest part of the backbone called the sacrum

The smallest bone is the stirrup (stapes) 

The strongest bone for its size is the lower jaw or mandible.

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