Science Virtual Guide 4A Second Session

2.

The earth spins on its own axis as it orbits the sun

True
False

Correct Answer

A. True

Explanation

The statement is true because the Earth does indeed spin on its own axis as it orbits the sun. This spinning motion is what causes the cycle of day and night. As the Earth orbits the sun, it also rotates on its axis, completing one full rotation every 24 hours. This rotation is responsible for the changing positions of the sun, moon, and stars in the sky throughout the day and night.

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3.

The earth is the only planet in our solar system which has perfect conditions for life.

True
False

Correct Answer

A. True

Explanation

The explanation for the given correct answer is that the Earth is the only planet in our solar system known to have all the necessary conditions for life as we know it. It has a suitable distance from the sun, which allows for liquid water to exist on its surface. It also has a protective atmosphere that provides the right balance of gases for life to thrive. Additionally, Earth's geology and magnetic field play important roles in creating a stable environment. While there may be other planets with potential for life outside our solar system, within our known system, Earth is unique in its ability to support life.

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4.

Shadows are smaller when an object is further away from the light source.

True
False

Correct Answer

A. True

Explanation

When an object is further away from the light source, the light rays that hit the object become more spread out. As a result, the shadow cast by the object appears smaller because the edges of the shadow are less defined. This phenomenon can be observed in everyday life, such as when the sun is high in the sky and objects cast shorter shadows compared to when the sun is lower on the horizon. Therefore, the statement "Shadows are smaller when an object is further away from the light source" is true.

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5.

The lenses in sunglasses are translucent

True
False

Correct Answer

A. True

Explanation

The statement "The lenses in sunglasses are translucent" is true. Translucent means that light can pass through the lenses but it is partially blocked or diffused. Sunglasses are designed to reduce the brightness of sunlight and protect the eyes from harmful UV rays. Translucent lenses allow some light to pass through while still providing shade and reducing glare. This is why sunglasses are effective in providing comfort and protection to the eyes in bright conditions.

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1

6.

The earth spins or rotates on its own axis. It takes one month to complete one rotation.

True
False

Correct Answer

A. False

Explanation

The given statement is incorrect. The earth actually takes approximately 24 hours, or one day, to complete one rotation on its own axis. This rotation is what causes day and night on earth.

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7.

The telescope was an important discovery because it enabled scientists to study objects in the solar system more closely and to prove some of their theories about the solar system.

True
False

Correct Answer

A. True

Explanation

The statement is true because the invention of the telescope revolutionized astronomy. It allowed scientists to observe celestial objects with greater detail and clarity, leading to important discoveries about the solar system. By studying these objects more closely, scientists were able to gather evidence that supported their theories and hypotheses about the formation and workings of the solar system. The telescope played a crucial role in advancing our understanding of the universe.

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8.

The earth moves around the

Moon
Sun
Jupiter
Mars

Correct Answer

A. Sun

Explanation

The earth moves around the Sun because of the gravitational force between the two. This gravitational force keeps the earth in its orbit around the Sun, causing it to continuously move in a circular path. The Sun's massive size and strong gravitational pull make it the dominant force in our solar system, influencing the motion of all the planets, including the earth.

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9.

Opaque materials let no light through them.

True
False

Correct Answer

A. True

Explanation

Opaque materials are those that do not allow any light to pass through them. This means that they block the transmission of light and do not allow it to pass through, resulting in the absence of any visible light on the other side of the material. Therefore, the statement "Opaque materials let no light through them" is true.

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10.

To measure the Luxes accurately, we can use a light meter.

True
False

Correct Answer

A. True

Explanation

The statement is true because a light meter is a device specifically designed to measure the intensity of light, which is expressed in units called lux. Lux is a measure of the amount of visible light that falls on a surface per unit area. Therefore, using a light meter is an accurate and reliable way to measure luxes.

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11.

One year on the Earth is around 365 days and 6 hours

True
False

Correct Answer

A. True

Explanation

The Earth takes approximately 365 days and 6 hours to complete one orbit around the Sun. This additional 6 hours in a year is why we have a leap year every 4 years, where an extra day is added to the calendar. Therefore, the statement that one year on Earth is around 365 days and 6 hours is true.

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12.

Opaque materials let some light through them.

True
False

Correct Answer

A. False

Explanation

Opaque materials do not let any light pass through them. They block the transmission of light, making them unable to be seen through.

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13.

Why the person has the shadows?

Because the person was illuminated by a light source
Because the person was illuminated by the sun
Because the person was illuminated by three light sources
Because the person was illuminated by four light sources

Correct Answer

A. Because the person was illuminated by three light sources

Explanation

The person has shadows because they were illuminated by three light sources. When an object is illuminated by multiple light sources, it can cast multiple shadows in different directions. In this case, the person would have three shadows due to the three light sources.

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14.

Shadows are smaller when an object is closer to the light source.

True
False

Correct Answer

A. False

Explanation

The statement is false because shadows are actually larger when an object is closer to the light source. This is because the closer an object is to the light source, the larger its shadow will be due to the angle at which the light hits the object and casts the shadow. As the distance between the object and the light source decreases, the shadow becomes more elongated and larger in size.

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15.

How the day and night is produced

The revolution of the earth causes day and night because one face of the earth is in front of the sun and the other is facing away from the sun.
The rotation of the earth causes day and night because one face of the earth is in front of the sun and the moon illuminates the other face
The rotation of the earth causes day and night because one face of the earth is in front of the sun and the other is facing away from the sun.
The rotation of the earth causes the day and night because the earth always has the sun rays illuminating it.

Correct Answer

A. The rotation of the earth causes day and night because one face of the earth is in front of the sun and the other is facing away from the sun.

Explanation

The correct answer states that the rotation of the earth causes day and night because one face of the earth is in front of the sun and the other is facing away from the sun. This is true because as the earth rotates on its axis, different parts of the earth receive sunlight while others are in darkness. This rotation creates the cycle of day and night that we experience.

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16.

Choose the things that human-made satellites can be used for.

Communications
Investigate human life
Produce energy
Monitoring the weather

Correct Answer(s)

A. Communications
A. Monitoring the weather

Explanation

Human-made satellites can be used for communications and monitoring the weather. Communications satellites are designed to transmit and receive signals for various purposes, such as television broadcasting, internet connectivity, and telephone communication. On the other hand, weather monitoring satellites are equipped with sensors and instruments to observe and collect data on weather patterns, atmospheric conditions, and climate changes. These satellites play a crucial role in providing accurate weather forecasts, tracking storms, and studying climate patterns. However, investigating human life and producing energy are not among the primary purposes of human-made satellites.

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Science Virtual Guide 4a Second Session

There are 7 planets that move around the sun

Quiz Preview

The earth spins on its own axis as it orbits the sun

The earth is the only planet in our solar system which has perfect conditions for life.

Shadows are smaller when an object is further away from the light source.

The lenses in sunglasses are translucent

The earth spins or rotates on its own axis. It takes one month to complete one rotation.

The telescope was an important discovery because it enabled scientists to study objects in the solar system more closely and to prove some of their theories about the solar system.

The earth moves around the

Opaque materials let no light through them.

To measure the Luxes accurately, we can use a light meter.

One year on the Earth is around 365 days and 6 hours

Opaque materials let some light through them.

Why the person has the shadows?

Shadows are smaller when an object is closer to the light source.

How the day and night is produced

Choose the things that human-made satellites can be used for.