Physics
Grade-9
Easy

Question

Work is done on or by the particles of a gas system by _____.

  1. Providing heat
  2. Movement of the piston
  3. Cooling the system
  4. None of the above

The correct answer is: Movement of the piston

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_____ is a visible transfer of energy into or out of a system.

_____ is a visible transfer of energy into or out of a system.

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The volume of the system does not change. Such a system is called ____.

The volume of the system does not change. Such a system is called ____.

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The temperature of the system does not change. Such a system is called ________.

The temperature of the system does not change. Such a system is called ________.

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A pot of water is heated, what happens at a molecular level?

A pot of water is heated, what happens at a molecular level?

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743 J = ____ cal

743 J = ____ cal

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847 cal =  ___ kcal

847 cal =  ___ kcal

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625 cal = ____ J

Energy is the ability to do work which is measured in different units. Calorie and Joule are the units of energy which are proportionate to each other. This implies any change in the value of calories will change its equivalent value in joules. The relation between calorie and joule can be numerically written as : 1 calorie = 4.2 joules approx.
Hence, 625 cal= (625* 4.2)= 2,615 joules.

625 cal = ____ J

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Energy is the ability to do work which is measured in different units. Calorie and Joule are the units of energy which are proportionate to each other. This implies any change in the value of calories will change its equivalent value in joules. The relation between calorie and joule can be numerically written as : 1 calorie = 4.2 joules approx.
Hence, 625 cal= (625* 4.2)= 2,615 joules.

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25 kcal = ____cal

The kilo calorie is a measurement unit of energy. The symbol of kilo calorie is kcal.The kilocalorie is used in measuring the heating, calorific value or metabolizing foods. It equals to 1000 calories, or approximately 4.2 kilojoules. Therefore, 1 kcal= 1000 cal.
so, 25 kcal= (25*1000)= 25000 cal.

25 kcal = ____cal

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The kilo calorie is a measurement unit of energy. The symbol of kilo calorie is kcal.The kilocalorie is used in measuring the heating, calorific value or metabolizing foods. It equals to 1000 calories, or approximately 4.2 kilojoules. Therefore, 1 kcal= 1000 cal.
so, 25 kcal= (25*1000)= 25000 cal.

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When sufficient heat is supplied to an ice cube

When heat is applied to an ice molecule, the solid phase changes to the liquid phase and thus the ice is melted into water after applying heat. Heating a substance makes the molecules move faster and thus the heat energy breaks the hydrogen bonds that hold the molecules in the ice together thus resulting in melting of ice.

When sufficient heat is supplied to an ice cube

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When heat is applied to an ice molecule, the solid phase changes to the liquid phase and thus the ice is melted into water after applying heat. Heating a substance makes the molecules move faster and thus the heat energy breaks the hydrogen bonds that hold the molecules in the ice together thus resulting in melting of ice.

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Match the following:
  State   Flow of heat
a i  To the hand
b ii From the hand
c  iii None

Match the following:
  State   Flow of heat
a i  To the hand
b ii From the hand
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In which of the following states the potential energy is the lowest?

In which of the following states the potential energy is the lowest?

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The molecules of which form of water have the lowest kinetic energy?

The molecules of which form of water have the lowest kinetic energy?

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The heat energy flows from a _____ to _____ body.

The heat energy flows from a _____ to _____ body.

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A pot of water is freezed, what happens at a molecular level?

A pot of water is freezed, what happens at a molecular level?

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87 kcal = ____ cal

87 kcal = ____ cal

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