Phy 1

Question 1

What is the law of conservation of energy?

Answer 1

Energy cannot be created or destroyed, only transformed from one form to another.

Question 2

True or False: Energy can be created from nothing.

Answer 2

False

Question 3

Fill in the blank: The total energy in a closed system remains _____.

Answer 3

constant

Question 4

What are the two main types of energy?

Answer 4

Kinetic energy and potential energy.

Question 5

What is kinetic energy?

Answer 5

The energy of an object due to its motion.

Question 6

What is potential energy?

Answer 6

The energy stored in an object due to its position or state.

Question 7

Multiple Choice: Which of the following is a form of potential energy? A) Thermal B) Gravitational C) Kinetic D) Mechanical

Answer 7

B) Gravitational

Question 8

What is mechanical energy?

Answer 8

The sum of kinetic and potential energy in an object.

Question 9

True or False: Energy dissipation refers to the loss of energy to the surrounding environment.

Answer 9

True

Question 10

What is an example of energy dissipation?

Answer 10

Friction converting kinetic energy into thermal energy.

Question 11

Fill in the blank: In an ideal machine, energy is _____ and not dissipated.

Answer 11

conserved

Question 12

What term describes the energy that is no longer usable for doing work?

Answer 12

Waste energy.

Question 13

Multiple Choice: Which process converts kinetic energy into thermal energy? A) Photosynthesis B) Friction C) Nuclear fission D) Chemical reaction

Answer 13

B) Friction

Question 14

What is the principle of energy transformation?

Answer 14

Energy can change from one form to another, but the total amount remains constant.

Question 15

True or False: In a closed system, the total energy can change over time.

Answer 15

False

Question 16

What is thermal energy?

Answer 16

The energy that comes from the temperature of matter.

Question 17

Fill in the blank: Energy can be transformed into different forms, but the _____ remains the same.

Answer 17

total energy

Question 18

What happens to energy in a system when work is done?

Answer 18

Energy is transferred or transformed.

Question 19

Multiple Choice: Which of the following is NOT a type of energy? A) Nuclear B) Solar C) Fluid D) Thermal

Answer 19

C) Fluid

Question 20

What is the significance of energy efficiency?

Answer 20

It measures how much of the input energy is converted into useful work.

Question 21

True or False: All energy transformations are 100% efficient.

Answer 21

False

Question 22

What is an example of a renewable energy source?

Answer 22

Solar energy.

Question 23

Fill in the blank: The first law of thermodynamics is also known as the law of _____ energy.

Answer 23

conservation

Question 24

What is the second law of thermodynamics?

Answer 24

In any energy transfer, the total entropy of a closed system can only increase.

Question 25

Multiple Choice: Which of the following increases entropy? A) Freezing water B) Burning fuel C) Compressing gas D) Cooling

Answer 25

B) Burning fuel

Question 26

What is entropy?

Answer 26

A measure of disorder or randomness in a system.

Question 27

True or False: Higher entropy means lower energy availability for doing work.

Answer 27

True

Question 28

Fill in the blank: Energy can be transferred by _____, conduction, and radiation.

Answer 28

convection

Question 29

What is conduction?

Answer 29

The transfer of heat through direct contact between materials.

Question 30

What is convection?

Answer 30

The transfer of heat through the movement of fluids.

Question 31

What is radiation?

Answer 31

The transfer of energy through electromagnetic waves.

Question 32

Multiple Choice: Which form of energy is associated with the motion of charged particles? A) Kinetic B) Thermal C) Electric D) Chemical

Answer 32

C) Electric