ENERGY, HEAT, WORK AND ELECTRICITY

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Test your knowledge about energy, heat, work and electricity concepts and principles.

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lea

Philippines

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ENERGY, HEAT, WORK AND ELECTRICITY


Froggy Jumps ENERGY, HEAT, WORK AND ELECTRICITYOnline version Test your knowledge about energy, heat, work and electricity concepts and principles. by lea 1 What does the law of conservation of mechanical energy state? a For any system the total amount of mechanical energy remains the same b Potential energy is always equal to kinetic energy c Potential energy is always converted to kinetic energy 2 Which of the following happens to the energy of a coconut that falls freely? a Loses potential and gains kinetic energy. b Loses both potential and gains kinetic energy. c Gains potential and loses kinetic energy. 3 The wind-up toy that is fully wound and at rest possesses a potential but no kinetic b kinetic but no potential energy c both potential and kinetic energy in equal amounts 4 Which of the following is the best example of the conservation of mechanical energy? a A pendulum swinging back and forth without air resistance. b A ball rolling on the ground and coming to a stop. c A person pushing a box across the floor. 5 A roller coaster car starts from rest at the top of a hill. As it moves down, what happens to its energy? a Potential energy decreases, kinetic energy increases. b Potential energy increases, kinetic energy decreases. c Both kinetic and potential energy remain the same. 6 A ball is dropped from a certain height. Just before hitting the ground, what type of energy does it mostly have? a Only kinetic energy b Only potential energy c Equal amounts of kinetic and potential energy 7 Which condition must be met for mechanical energy to be conserved in a system? a There must be no external forces like friction or air resistance. b The system must be moving in a circular path. c The mass of the objects must be equal. 8 Which heat transfer process involves the movement of fluids (liquids or gases) due to differences in temperature and density? a Convection b Radiation c Conduction 9 Which of these is an example of a spontaneous heat transfer process? a Ice melting in a warm room b An air conditioner cooling a room c A refrigerator cooling food 10 Why do refrigerators require electricity to function? a To force heat to move from a colder area to a warmer area b To naturally let heat escape from the food c To generate heat inside the fridge 11 In which process does heat energy flow from a high-temperature source to a low-temperature sink to produce work? a The thermodynamic cycle b Convection c Conduction 12 What best describes the importance of heat flow in everyday life? a It helps in cooking, heating, and cooling systems b It prevents objects from changing temperature c It is only useful in scientific experiments 13 What happens to energy when work is done on an object? a It can be transformed into heat energy b It is converted entirely into sound energy c It disappears after work is done 14 Which of the following best describes how doing work releases heat? a Friction converts mechanical energy into thermal energy b Work always converts energy into potential energy c The force applied to an object decreases its energy 15 Which of the following is an example of work being converted into heat? a A car engine warming up after being turned off b Ice melting in the sun c A lightbulb producing light 16 What is the main principle behind heat engines? a They transform heat energy into mechanical work. b They convert electrical energy into sound energy. c They generate heat without using fuel. 17 How does a heat engine produce work? a By using heat to create pressure that moves a piston or turbine. b By cooling down materials to generate power. c By converting kinetic energy directly into heat. 18 In an internal combustion engine, how does energy transformation occur? a Chemical energy in fuel is converted into heat, then into mechanical work. b Electrical energy is stored and used later. c The heat energy is absorbed without transformation. 19 Which law of thermodynamics explains why heat engines cannot be 100% efficient? a The second law – some energy is always lost as waste heat. b The first law – energy cannot be created or destroyed. c The third law – absolute zero cannot be reached. 20 What is the first step in generating electricity in most power plants? a Activating the energy source b Converting electrical energy to mechanical energy c Transmission of electricity to homes 21 What is the main function of turbines in power plants? a To convert steam or moving water into mechanical energy b To transfer energy from fuel to the generator c To transmit electricity to homes 22 How does a hydroelectric power plant generate electricity? a By harnessing moving water to spin turbines b By absorbing sunlight through solar panels c By using the heat from underground 23 What happens to the electricity after it is generated in power plants? a It is transmitted through power lines to consumers b It is directly used in appliances c It is stored in large batteries 24 What is the function of a step-up transformer in the transmission process? a To increase voltage for long-distance transmission b To decrease voltage for safe household use c To generate electricity from power plants 25 What could happen if there were no step-down transformers? a High voltage electricity would damage household appliances b Appliances would work more efficiently c Electricity would be too weak to power homes

ENERGY, HEAT, WORK AND ELECTRICITY

Froggy Jumps

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ENERGY, HEAT, WORK AND ELECTRICITYOnline version

by lea

What does the law of conservation of mechanical energy state?

Which of the following happens to the energy of a coconut that falls freely?

The wind-up toy that is fully wound and at rest possesses

Which of the following is the best example of the conservation of mechanical energy?

A roller coaster car starts from rest at the top of a hill. As it moves down, what happens to its energy?

A ball is dropped from a certain height. Just before hitting the ground, what type of energy does it mostly have?

Which condition must be met for mechanical energy to be conserved in a system?

Which heat transfer process involves the movement of fluids (liquids or gases) due to differences in temperature and density?

Which of these is an example of a spontaneous heat transfer process?

Why do refrigerators require electricity to function?

In which process does heat energy flow from a high-temperature source to a low-temperature sink to produce work?

What best describes the importance of heat flow in everyday life?

What happens to energy when work is done on an object?

Which of the following best describes how doing work releases heat?

Which of the following is an example of work being converted into heat?

What is the main principle behind heat engines?

How does a heat engine produce work?

In an internal combustion engine, how does energy transformation occur?

Which law of thermodynamics explains why heat engines cannot be 100% efficient?

What is the first step in generating electricity in most power plants?

What is the main function of turbines in power plants?

How does a hydroelectric power plant generate electricity?

What happens to the electricity after it is generated in power plants?

What is the function of a step-up transformer in the transmission process?

What could happen if there were no step-down transformers?