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Physics

Grade-9

Easy

Question

The boiling point of nitrogen is 77.36 K. Its state at – 173 degrees Celsius is ___.

Solid
Liquid
Gas
None

hint Hint:

Matter can change its state upon heating or cooling.

The correct answer is: Gas

Converting Degrees into kelvin. -173+273 = 100 kelvin

Matter will be in the gaseous state when temperature is above its boiling point.

So nitrogen will be a gas.

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Mercury freezes at around -38.33^o Celsius. What is the state of mercury at 30^o Celsius?

Mercury freezes at around -38.33^o Celsius. What is the state of mercury at 30^o Celsius?

When a solid is converted to a liquid, its temperature _____.

When a solid is converted to a liquid, its temperature _____.

parallel

Steam condenses on _____ its temperature.

Steam condenses on _____ its temperature.

The melting point of ice is ____.

The melting point of ice is ____.

The state of a substance changes on ____.

The state of a substance changes on ____.

parallel

The temperature at which a substance boils is called its _____.

The temperature at which a substance boils is called its _____.

_____ can exist in all the states of matter.

_____ can exist in all the states of matter.

The coefficient of thermal expansion of a material determines ____.

The coefficient of thermal expansion of a material determines ____.

parallel

When the temperature of a liquid decreases, its constituent particles ____.

When the temperature of a liquid decreases, its constituent particles ____.

As a result of thermal expansion, solids experience a change in _____.

As a result of thermal expansion, solids experience a change in _____.

Given below is a table showing the values of the coefficients of thermal expansions of some materials. Answer the question based on the table.
A bronze and a silver rod are heated to increase their temperatures by the same amounts. Which of them would expand more?

Substance Coefficient of Expansion Per Degree Centigrade

$text Aluminium end text$ $25 cross times 10 to the power of negative 6 end exponent$

$text Brass or Bronze end text$ $19 cross times 10 to the power of negative 6 end exponent$

$text Brick end text$ $9 cross times 10 to the power of negative 6 end exponent$

$text Copper end text$ $17 cross times 10 to the power of negative 6 end exponent$

$text Glass (Plate) end text$ $9 cross times 10 to the power of negative 6 end exponent$

$text Glass (Pyrex) end text$ $3 cross times 10 to the power of negative 6 end exponent$

$text Iron or Steel end text$ $11 cross times 10 to the power of negative 6 end exponent$

$text Lead end text$ $29 cross times 10 to the power of negative 6 end exponent$

$text Quartz end text$ $0.4 cross times 10 to the power of negative 6 end exponent$

$text Silver end text$ $19 cross times 10 to the power of negative 6 end exponent$

Given below is a table showing the values of the coefficients of thermal expansions of some materials. Answer the question based on the table.
A bronze and a silver rod are heated to increase their temperatures by the same amounts. Which of them would expand more?

Substance Coefficient of Expansion Per Degree Centigrade

$text Aluminium end text$ $25 cross times 10 to the power of negative 6 end exponent$

$text Brass or Bronze end text$ $19 cross times 10 to the power of negative 6 end exponent$

$text Brick end text$ $9 cross times 10 to the power of negative 6 end exponent$

$text Copper end text$ $17 cross times 10 to the power of negative 6 end exponent$

$text Glass (Plate) end text$ $9 cross times 10 to the power of negative 6 end exponent$

$text Glass (Pyrex) end text$ $3 cross times 10 to the power of negative 6 end exponent$

$text Iron or Steel end text$ $11 cross times 10 to the power of negative 6 end exponent$

$text Lead end text$ $29 cross times 10 to the power of negative 6 end exponent$

$text Quartz end text$ $0.4 cross times 10 to the power of negative 6 end exponent$

$text Silver end text$ $19 cross times 10 to the power of negative 6 end exponent$

parallel

Given below is a table showing the values of the coefficients of thermal expansions of some materials. Answer the question based on the table.
Sagar is provided with a brass rod and a lead rod of identical dimensions. He heats the rods through the same temperature increase. Which rod would expand more?

Substance Coefficient of Expansion Per Degree Centigrade

$text Aluminium end text$ $25 cross times 10 to the power of negative 6 end exponent$

$text Brass or Bronze end text$ $19 cross times 10 to the power of negative 6 end exponent$

$text Brick end text$ $9 cross times 10 to the power of negative 6 end exponent$

$text Copper end text$ $17 cross times 10 to the power of negative 6 end exponent$

$text Glass (Plate) end text$ $9 cross times 10 to the power of negative 6 end exponent$

$text Glass (Pyrex) end text$ $3 cross times 10 to the power of negative 6 end exponent$

$text Iron or Steel end text$ $11 cross times 10 to the power of negative 6 end exponent$

$text Lead end text$ $29 cross times 10 to the power of negative 6 end exponent$

$text Quartz end text$ $0.4 cross times 10 to the power of negative 6 end exponent$

$text Silver end text$ $19 cross times 10 to the power of negative 6 end exponent$

Given below is a table showing the values of the coefficients of thermal expansions of some materials. Answer the question based on the table.
Sagar is provided with a brass rod and a lead rod of identical dimensions. He heats the rods through the same temperature increase. Which rod would expand more?

Substance Coefficient of Expansion Per Degree Centigrade

$text Aluminium end text$ $25 cross times 10 to the power of negative 6 end exponent$

$text Brass or Bronze end text$ $19 cross times 10 to the power of negative 6 end exponent$

$text Brick end text$ $9 cross times 10 to the power of negative 6 end exponent$

$text Copper end text$ $17 cross times 10 to the power of negative 6 end exponent$

$text Glass (Plate) end text$ $9 cross times 10 to the power of negative 6 end exponent$

$text Glass (Pyrex) end text$ $3 cross times 10 to the power of negative 6 end exponent$

$text Iron or Steel end text$ $11 cross times 10 to the power of negative 6 end exponent$

$text Lead end text$ $29 cross times 10 to the power of negative 6 end exponent$

$text Quartz end text$ $0.4 cross times 10 to the power of negative 6 end exponent$

$text Silver end text$ $19 cross times 10 to the power of negative 6 end exponent$

Glass containers may crack when a hot liquid is suddenly poured into them because ____.

Glass containers may crack when a hot liquid is suddenly poured into them because ____.

Olive oil is cooled in the freezer. What happens to the kinetic energy of its particles? What does it lead to?

Olive oil is cooled in the freezer. What happens to the kinetic energy of its particles? What does it lead to?

parallel

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