Which of the following best predicts what will happen when white light passes through a green object?
- A. The object will mostly reflect the green part of the light.
- B. The object will mostly absorb the green part of the light.
- C. The object will appear black.
- D. The object will appear white.
Correct Answer & Rationale
Correct Answer: A
When white light passes through a green object, the object primarily reflects green wavelengths while absorbing others. This reflection causes the object to appear green to our eyes. Option B is incorrect because if the object absorbed the green part of the light, it would not appear green. Option C is not valid, as a black appearance would result from the object absorbing all wavelengths of light, not reflecting any. Option D is also wrong; an object appears white when it reflects all wavelengths of light equally, which does not apply to a green object.
When white light passes through a green object, the object primarily reflects green wavelengths while absorbing others. This reflection causes the object to appear green to our eyes. Option B is incorrect because if the object absorbed the green part of the light, it would not appear green. Option C is not valid, as a black appearance would result from the object absorbing all wavelengths of light, not reflecting any. Option D is also wrong; an object appears white when it reflects all wavelengths of light equally, which does not apply to a green object.
Other Related Questions
A reaction occurs between two liquid substances in a sealed container. Based on the law of conservation of mass, what will happen to the mass of the sealed container and its contents overall?
- A. If the reaction produces a gas, the mass will decrease.
- B. If the reaction produces a solid, the mass will increase.
- C. If the reaction produces a liquid, the mass will increase as well.
- D. No matter what the reaction produces, the mass will remain the same.
Correct Answer & Rationale
Correct Answer: D
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. Therefore, regardless of whether a gas, solid, or liquid is produced, the total mass of the sealed container and its contents will remain constant. Option A is incorrect; while gas may escape in an open system, a sealed container retains all products, so mass does not decrease. Option B is misleading; while a solid may form, it does not increase the total mass, as the mass of reactants equals that of products. Option C also misinterprets mass conservation; producing a liquid does not add to the total mass. Thus, the overall mass remains unchanged throughout the reaction.
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. Therefore, regardless of whether a gas, solid, or liquid is produced, the total mass of the sealed container and its contents will remain constant. Option A is incorrect; while gas may escape in an open system, a sealed container retains all products, so mass does not decrease. Option B is misleading; while a solid may form, it does not increase the total mass, as the mass of reactants equals that of products. Option C also misinterprets mass conservation; producing a liquid does not add to the total mass. Thus, the overall mass remains unchanged throughout the reaction.
A neutral atom always contains an equal number of which of the following?
- A. Protons and electrons
- B. Protons and neutrons
- C. Neutrons and electrons
- D. Protons and alpha particles
Correct Answer & Rationale
Correct Answer: A
A neutral atom contains an equal number of protons and electrons, ensuring that the positive and negative charges balance each other out, resulting in no overall charge. Option B is incorrect because protons and neutrons do not need to be equal; the number of neutrons can vary, leading to different isotopes. Option C is also wrong, as neutrons do not have a charge and do not balance with electrons, which are negatively charged. Lastly, option D is incorrect since alpha particles, which consist of two protons and two neutrons, are not found in neutral atoms and do not play a role in charge balance.
A neutral atom contains an equal number of protons and electrons, ensuring that the positive and negative charges balance each other out, resulting in no overall charge. Option B is incorrect because protons and neutrons do not need to be equal; the number of neutrons can vary, leading to different isotopes. Option C is also wrong, as neutrons do not have a charge and do not balance with electrons, which are negatively charged. Lastly, option D is incorrect since alpha particles, which consist of two protons and two neutrons, are not found in neutral atoms and do not play a role in charge balance.
The rotation of Earth around its axis is responsible for which of the following?
- A. The force of gravity
- B. The day and night cycle
- C. The temperature differences between seasons
- D. The movement of continents relative to one another
Correct Answer & Rationale
Correct Answer: B
The rotation of Earth around its axis creates the day and night cycle, as different parts of the planet face the Sun and then move into its shadow. This explains why we experience daytime and nighttime in a 24-hour period. Option A is incorrect; gravity is primarily caused by Earth's mass, not its rotation. Option C is also wrong; temperature differences between seasons are due to Earth's tilt and its orbit around the Sun, not its rotation. Lastly, option D misrepresents the concept; the movement of continents is influenced by tectonic activity, not the rotation of Earth.
The rotation of Earth around its axis creates the day and night cycle, as different parts of the planet face the Sun and then move into its shadow. This explains why we experience daytime and nighttime in a 24-hour period. Option A is incorrect; gravity is primarily caused by Earth's mass, not its rotation. Option C is also wrong; temperature differences between seasons are due to Earth's tilt and its orbit around the Sun, not its rotation. Lastly, option D misrepresents the concept; the movement of continents is influenced by tectonic activity, not the rotation of Earth.
The preceding figure represents a cloud that has formed in the atmosphere above Earth's surface. Which of the following diagrams best illustrates the arrangement of charges in the cloud and on Earth's surface just before a cloud-to-ground lightning strike?
- A. Cloud: top (+), middle (-), bottom (+); Ground: (-)
- B. Cloud: top (+), middle (+), bottom (-); Ground: (+)
- C. Cloud: top (-), middle (+), bottom (+); Ground: (-)
- D. Cloud: top (+), middle (-), bottom (-); Ground: (+)
Correct Answer & Rationale
Correct Answer: D
In a thunderstorm, clouds typically develop a charge separation where the upper region becomes positively charged and the lower region negatively charged. This charge distribution is crucial for lightning formation. Option D accurately represents this arrangement: the top of the cloud is positively charged, the middle is negatively charged, and the bottom is also negatively charged, while the ground becomes positively charged in response to the cloud's negative charge. Option A incorrectly places a positive charge at the bottom of the cloud, which does not align with typical charge distributions. Option B misrepresents the charges by having two positive regions in the cloud, which is unlikely. Option C also fails by placing the top of the cloud negatively charged, contradicting the established understanding of charge distribution in storm clouds.
In a thunderstorm, clouds typically develop a charge separation where the upper region becomes positively charged and the lower region negatively charged. This charge distribution is crucial for lightning formation. Option D accurately represents this arrangement: the top of the cloud is positively charged, the middle is negatively charged, and the bottom is also negatively charged, while the ground becomes positively charged in response to the cloud's negative charge. Option A incorrectly places a positive charge at the bottom of the cloud, which does not align with typical charge distributions. Option B misrepresents the charges by having two positive regions in the cloud, which is unlikely. Option C also fails by placing the top of the cloud negatively charged, contradicting the established understanding of charge distribution in storm clouds.