Umbra and Penumbra

Q.

what is shadow and how is it formed form

Q.

The most central and darkest part of a shadow is called an

1. Penumbra

2. Solar eclipse

3. Lunar eclipse

4. Umbra

Q. The darkest part of the moon's shadow is called the

1. Orbit
2. Penumbra
3. Umbra
4. Axis

Q.

What are the two regions of a shadow?

1. Umbra

2. Penumbra

3. Light shadow

4. Full shadow

Q. What is the less dark region of a shadow called?

1. Penumbra
2. Eclipse
3. None of these
4. Umbra

Q. The darkest part of the shadow is called the .

1. orbit
2. penumbra
3. umbra
4. axis

Q. Shadows are formed due to ____ propagation of light.

1. elliptical
2. rectilinear
3. circular
4. curvilinear

Q.

What are the factors that are required for obtaining the shadow of an object?​

1. Source of light

2. Opaque object

3. A screen

4. All of the above

Q. Which region is present in the shadow formed by a point source of light?

1. both umbra and penumbra regions
2. only umbra region
3. only penumbra region
4. depends on the distance of source from the obstacle

Q.

Give one word

The partially dark region in a shadow.

Q.

The fully shaded region or the darker region of a shadow is called_______

1. Umbra

2. Penumbra

3. Sub umbra

4. Ultraumbra

Q.

___and___ are the different parts of shadows created by any light source after being partially obstructed by an opaque object.

1. Frequency and wavelength

2. Umbra and Penumbra

3. Umbra and Ultraumbra

4. Solar and Lunar

Q.

________________ is a completely dark portion of a shadow.

Q.

Differentiate between umbra and penumbra.

Q.

The aeroplanes flying high in the sky cast their shadow on the ground. State if the statement is true or false.

1. False

2. True

Q.

Give one word for: A part of the shadow that does not receive light at all.

Q. The shadow formed due to a point source of light has_____ region.

1. umbra
2. penumbra
3. umbra and penumbra
4. bright

Q.

Name a few natural wonders of light and colour.

Q.

Sundar was standing outside in the evening, enjoying the light drizzle after the rain. Suddenly he observed a rainbow in the sky. He called his father and asked him, what it is and how it is formed. His father explained to him about its formation and also told him a similar phenomenon can be observed with a prism also.

a. What is the name of phenomena? Which colors deviate more and why?

b. What values did Sundars father exhibit?

Q. The darkest part of the shadow is called the .

1. orbit
2. penumbra
3. umbra
4. axis

Q. Shadows are formed due to ____ propagation of light.

1. elliptical
2. curvilinear
3. circular
4. rectilinear

Q. In ______ of a shadow, only part of light is obstructed.

1. Sub-umbra
2. Penumbra
3. Antumbra
4. Umbra

Q. In ______ of a shadow, only part of light is obstructed.

1. Sub-umbra
2. Penumbra
3. Antumbra
4. Umbra

Q.

___ objects allow light to pass through them partially.

1. Wood

2. Translucent

3. Opaque

4. Carbon

Q. The most central and darkest part of a shadow is called an_______.

(A) Penumbra
(B) Solar eclipse
(C) Lunar eclipse
(D) Umbra [1 Mark]

Q.

A rainbow is formed when white light from the sun passes through tiny prism-like water droplets and splits into different colours.

1. True
2. False

Q.

Why a rainbow consists of a pattern of seven colours?

Q.

What are the two regions of a shadow?

1. Umbra

2. Penumbra

3. Umbrella

4. Eclipse

Q. Identify the translucent slab in the given picture:

1. 
2. 
3. 

Q.

The shadow formed due to a point source of light has_____.

1. only umbra region

2. only penumbra region

3. both umbra and penumbra regions

4. depends on the distance of the source from the obstacle