Physics
Grade-9
Easy
Question
In which of the following states the potential energy is the highest?
- Solid
- Liquid
- Gas
- Bose-Einstein Condensate
Hint:
Potential energy is highest in solids due to more force of attraction
The correct answer is: Solid
The molecules of solid do not move randomly as in liquids and gases due to more attraction and less space and hence they posses more potential energy
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Physics
How do we know that a substance has changed state from solid to liquid at a molecular level?
- The particles keep vibrating at their places as before.
- The particles spill out of the container.
- The particles stop moving.
- The particles move at a greater speed and increased randomness in motion.
How do we know that a substance has changed state from solid to liquid at a molecular level?
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- The particles keep vibrating at their places as before.
- The particles spill out of the container.
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Match the following:
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a. Solid | i. Highest kinetic energy of the molecules |
b. Liquid | ii. Highest potential energy of the molecules |
c. Gas | iii. Moderate K E and P E |
- a-ii, b-iii, c-i
- a-i, b-iii, c-ii
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- a-i, b-ii, c-iii
Match the following:
State | Attributes |
a. Solid | i. Highest kinetic energy of the molecules |
b. Liquid | ii. Highest potential energy of the molecules |
c. Gas | iii. Moderate K E and P E |
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- a-ii, b-iii, c-i
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- a-iii, b-ii, c-i
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In which of the following physical states the intermolecular space is the highest?
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- Liquid
- Gas
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In which of the following physical states the intermolecular space is the highest?
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- Solid
- Liquid
- Gas
- All of the above
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What kind of energy is associated with the motion and speed of the particles constituting a substance?
- Potential energy
- Kinetic energy
- Gravitational potential energy
- Elastic energy
What kind of energy is associated with the motion and speed of the particles constituting a substance?
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- Potential energy
- Kinetic energy
- Gravitational potential energy
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Internal energy = _____ + _______.
- Gravitational energy, potential energy
- Kinetic energy, potential energy
- Kinetic energy, thermal energy
- Thermal energy, gravitational energy
Internal energy = _____ + _______.
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- Gravitational energy, potential energy
- Kinetic energy, potential energy
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- Thermal energy, gravitational energy
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The particles of a substance possess _____.
- Speed
- Kinetic energy
- Potential energy
- All of the above
The particles of a substance possess _____.
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- Speed
- Kinetic energy
- Potential energy
- All of the above
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The molecules of which form of water have the highest kinetic energy?
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- Water
- Steam
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The molecules of which form of water have the highest kinetic energy?
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When an ice cube is dropped into a cup of hot coffee, the heat flows from _________.
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- Nowhere
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When an ice cube is dropped into a cup of hot coffee, the heat flows from _________.
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The force of attraction between the water molecules gives rise to _________________.
- Kinetic energy
- Potential energy
- Gravitational energy
- Electrostatic energy
The force of attraction between the water molecules gives rise to _________________.
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- Kinetic energy
- Potential energy
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1 cal = ___ J
- 1000
- 2.4
- 4.2
- 3.6
1 cal = ___ J
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- 1000
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- 4.2
- 3.6
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1 kcal = ____ cal.
- 100000
- 10000
- 1000
- 100
1 kcal = ____ cal.
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- 100000
- 10000
- 1000
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1 Joule = ________________ Erg.
- 10000000
- 1000000
- 100000
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1 Joule = ________________ Erg.
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- 1000000
- 100000
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The S I unit of heat is _____________.
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The S I unit of heat is _____________.
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Malvika keeps melted ice-cream in the freezer for it to freeze back. Which of the following happens to the ice-cream?
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- The kinetic energy of the particles decreases.
- The amount of heat inside the container decreases.
- The temperature of ice-cream decreases.
Malvika keeps melted ice-cream in the freezer for it to freeze back. Which of the following happens to the ice-cream?
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- The speed of motion of the particles increases.
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- The amount of heat inside the container decreases.
- The temperature of ice-cream decreases.
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Four systems are at the following temperatures in degree Celsius. the speed of particles of which of the systems is the lowest?
- 35
- 87
- 12
- 76
Four systems are at the following temperatures in degree Celsius. the speed of particles of which of the systems is the lowest?
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- 35
- 87
- 12
- 76