Physics MCQs

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A fuel cell is an electrochemical cell that converts the potential energy from a fuel into electricity through an electrochemical reaction of hydrogen fuel with oxygen or another oxidizing agent

Notes:
The SI unit of magnetic flux is the weber (Wb) and the CGS unit is the maxwell.

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The activity of a radioactive sample is said to be one rutherford. 1 rutherford (Rd) = 10⁶ decays/second

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The value of Rydberg constant is 1.0973 x 10⁷ m^-1

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The SI unit of pressure is the pascal (Pa), defined as the pressure exerted by a force of one newton per square meter. The pascal is used to measure the pressure of gases and liquids, such as the pressure of the air in a tire or the pressure of water in a pipe. It is also used to measure the strength of materials, such as the pressure that a building foundation can withstand. It is the base unit of pressure in the International System of Units (SI). Other units of pressure, such as the bar, the atmosphere, and the pound per square inch, can be converted to pascals.

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Mirage is formed due to both Refraction and Total internal reflection of light. A mirage is a naturally occurring optical phenomenon in which light rays bend to produce a displaced image of distant objects or the sky.

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When the wooden block is not resting against a support, the block and nails both move forward on being hit with a hammer. However, when the block is held firmly against a support, and the nail is hit, an equal reaction of the support drives the nail into the block.

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A nautical mile is a unit of measurement used in both air and marine navigation, and for the definition of territorial waters. Historically, it was defined as one minute of latitude along any line of longitude. Knowing your latitude you also know the factor to determine what one minute of longitude is. Therefore, using nautical miles for length and knots makes common sense when navigating and traveling long distances. Today the international nautical mile is defined as exactly 1852 metres.

Notes:
Mach number is a measure of speed of an aeroplane. When we say an aircraft is flying at Mach 1, it means that the speed of the vehicle is 343 m/s. Mach number is the ratio between the true airspeed of the aircraft and the local speed of sound.

Notes:
In a stationary wave, the distance between two successive nodes (anti-nodes) is one half wavelengths. Therefore​, the distance between a node and the immediate next anti-node is one fourth of a wavelength.