Light Shadows and Reflections

What is the main message of the chapter "Light: Shadows and Reflections"?

1. Light can travel only through water.
2. Light travels in straight lines, forms shadows when blocked by opaque objects, and reflects from surfaces to produce images.
3. Shadows produce light.
4. Reflection occurs only in sunlight.

Why are mirrors polished and smooth?

1. To absorb more light
2. To reflect light regularly and form clear images
3. To become heavier
4. To reduce light completely

Which device works mainly on the principle of reflection?

1. Thermometer
2. Periscope
3. Barometer
4. Compass

Which property of light is responsible for the formation of shadows?

1. Light travels in straight lines.
2. Light produces sound.
3. Light changes into matter.
4. Light always bends.

Why does a shadow change in size during the day?

1. Because the object changes size.
2. Because the position of the Sun changes in the sky.
3. Because light becomes heavier.
4. Because air changes colour.

Which of the following materials is transparent?

1. Wood
2. Cardboard
3. Clear glass
4. Brick

What is lateral inversion?

1. The image becomes upside down.
2. The left and right sides of the image are reversed.
3. The image becomes smaller.
4. The image disappears completely.

Which statement about the image formed by a plane mirror is correct?

1. It is upside down.
2. It is smaller than the object.
3. It is upright and of the same size as the object.
4. It can always be collected on a screen.

Which mirror is commonly used as a dressing mirror?

1. Convex mirror
2. Concave mirror
3. Plane mirror
4. Spherical mirror only

What is reflection of light?

1. Bending of light
2. Splitting of light
3. Bouncing back of light from a surface
4. Absorption of light

Which type of object forms a dark shadow?

1. Transparent object
2. Opaque object
3. Translucent object
4. Colourless object

What is required for the formation of a shadow?

1. Only a transparent object
2. Only air
3. A light source, an opaque object, and a screen
4. Only a mirror

Light travels in which type of path?

1. Curved path
2. Zigzag path
3. Straight line
4. Circular path

Which of the following is a luminous object?

1. Moon
2. Mirror
3. Electric bulb (when switched on)
4. Chair

What is light?

1. A type of sound
2. A form of energy that enables us to see objects
3. A kind of solid matter
4. A type of force