Tag: matter around us
Questions Related to matter around us
Parsec is the unit of:
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Speed
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Time
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Distance
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None of the above
Electron Volt is a unit of:
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Potential difference
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Energy
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Charge
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Velocity
The electron volt (symbol eV; also written electronvolt) is a unit of energy equal to approximately 1.602$\times$10$^{−19}$ joule (SI unit J).
The international standards of weight and measures are made of:
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gold silver alloys
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platinum - iridium alloys
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copper - gold alloys
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platinum - iron alloys
On Celsius scale, $0$ Kelvin is equal to:
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$273^0C$
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$0^oC$
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$-273^oC$
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$-373^oC$
To convert from Kelvin scale to Celsius scale, subtract 273 from Celsius scale.
What is the physical state of water at $-20^{\circ}C$?
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Solid
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Liquid
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Gas
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None of the above
Water at $-20^{\circ}C$ is ice so it is in solid state. It freezes at $0^{\circ}C$.
Convert 44 K into Celsius scale.
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$-233^oC$
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$-229^oC$
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$-212^oC$
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$-239^oC$
To convert from Kelvin scale to Celsius scale, subtract 273 from Kelvin scale, so $44-273=-229^oC$.
The centigrade $(^0 C)$ scale can be converted into Kelvin scale by the formula:
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Temperature in Kelvin + 273
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Temperature in Kelvin - 273
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Temperature in Fahrenheit + 273
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Temperature in Fahrenheit - 273
The temperature T in Kelvin (K) is equal to the temperature T in degrees Celsius $\displaystyle \left( ^{ \circ }{ C } \right) + 273$:
Therefore, temperature in $\displaystyle ^{ \circ }{ C }$ = temperature in Kelvin +273.
Convert $30^oC$ to Kelvin scale.
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323K
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313 K
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303 K
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293 K
To convert from Celsius scale to Kelvin scale, we add 273 to Celsius scale. So, $30 + 273 = 303\ K$
Convert $-679^{\circ}$ F to celsius.
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412.24
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$-$395
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963
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$-$400
We know, $\boxed { { }^{ 0 }C=\left( { }^{ 0 }F-32 \right) \times \frac { 5 }{ 9 } } $
What is the temperature of water in kelvin if the water is at $44^{\circ}C$ ?
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330
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317
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229
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230
Temperature in$ K$ = Temperature in $^{\circ}C + 273$
= $44^{\circ}C + 273$
= $317 K$.