Heat Energy from the Sun

Q. The invisible energy that causes the sense of vision, is

1. sound
2. electricity
3. heat
4. light

Q.

Name the two basic things we need to see objects around us.

Q.

A student covered a torch with a red cellophane sheet to obtain red light. Using the red light she obtains a shadow of an opaque object. She repeats this activity with green and blue light. Will the color of the light affect the shadow? Explain.

Q.

A pinhole camera cannot be used to capture a moving object.

Q. Which of the following objects is luminous?

1. Mirror
2. The Moon
3. Earth
4. The Sun

Q. What is the region of darkness formed on a screen, when an opaque object blocks the path of light?

1. Luminosity
2. Shadow
3. Reflection
4. Image

Q.

Which is the ultimate source of energy?

1. Water

2. Sun

3. Uranium

4. Fossil fuels

Q. Which does not help in the working of a periscope?

1. Reflection
2. Shadow
3. Mirror
4. Light

Q.

Using a pinhole camera, a student observes the image of two of his friends standing in the sunlight wearing yellow and red shirts, respectively. What will be the colours of the shirts in the image?

Q. Can you help Alex identify which of the following parts is translucent?

1. Only 1
2. Only 2
3. Only 3
4. Both 1 and 2

Q. Which among the following objects must be used to cover the window of a room, so that the room remains dark during the day time?

1. Wooden board
2. Tracing paper
3. Glass pane
4. Butter paper

Q. Which of the following is a non-living luminous object?

1. Glow worm
2. Sun
3. Firefly
4. Mirror

Q. Shadow of an object is formed when the object:

1. Allows the light to pass through it
2. Bounces back light
3. Absorbs light
4. Bends light

Q. Define shadow.

Q. Objects that form faint shadows are ________ in nature.

1. translucent
2. opaque
3. irregular
4. transparent

Q. What do we mean by the rectilinear propagation of light?

1. Light only travels in air.
2. Light travels in a curved line.
3. Light travels in a circular path.
4. Light travels in a straight line.