Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 7th

# Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide chapter 1 - Light [Latest edition]

## Chapter 1: Light

Evaluation
Evaluation [Pages 19 - 20]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 1 LightEvaluation [Pages 19 - 20]

#### Choose the correct option

Evaluation | Q I. 1. | Page 19

Light travels only in a______ It is because of this property that______ are formed.

• straight line, reflection

• curved line and then straight line, shadows

Evaluation | Q I. 2. | Page 19

Light that hits a mirror gets ______.

• Transmitted

• Reflected

• Absorbed

• Refracted

Evaluation | Q I. 3. | Page 19

______Surface reflects the light well.

• water

• compact disc

• mirror

• stone

Evaluation | Q I. 4. | Page 19

Light is a form of ______.

• matter

• energy

• medium

• particle

Evaluation | Q I. 5. | Page 19

You can see your image in polished floors, but not in wooden table because ______.

• regular reflection takes place in wooden table and irregular reflection in polished floor

• regular reflection takes place in polished floor and irregular reflection in wooden table

• regular reflection takes place in both polished floor and wooden table

• irregular reflection takes place in both polished floor and wooden table

Evaluation | Q I. 6. | Page 19

Choose the translucent substance from the following

• glass

• wood

• water

• Clouds

Evaluation | Q I. 7. | Page 19

Reflection occurs , when the light

• about to reach a surface

• approaches a surface

• passes through a surface

• None of these

Evaluation | Q I. 8. | Page 19

Which of the following is the best reflector of light?

• plastic plate

• plane mirror

• wall

• paper

Evaluation | Q I. 9. | Page 19

Sivarajan placed a meter stick in the playground at 7.00 am in the morning. How will the shadow of the stick at noon look in comparison to the one in the morning

• There will be no shadow

• The shadow will be longer and on the opposite side as the sun

• The shadow will be shorter and on the same side as the sun

• The shadow will be shorter

Evaluation | Q I. 10. | Page 19

The image formed by a pinhole camera is inverted because,

• light travels in straight lines

• light rays become laterally inverted as they pass through a pinhole camera

• light rays pass through the pinhole

• light rays get reflected

Evaluation | Q I. 11. | Page 20

Which of the following facts explain how shadows are formed?

1. Light travels in straight lines
2. Opaque bodies do not allow light to pass through them
3. Reflection occurs at a smooth surfaces like mirrors
4. Lateral inversion happens
• both A and B

• both A and D

• both B and C

• only A

Evaluation [Pages 19 - 20]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 1 LightEvaluation [Pages 19 - 20]

#### Fill in the blanks.

Evaluation | Q II. 1. | Page 19

A plane mirror produces a ______image.

Evaluation | Q II. 2. | Page 20

A ______ reflection helps us to see the object

Evaluation | Q II. 3. | Page 20

The light ray gets _______ when it falls on any polished surface.

Evaluation | Q II. 4. | Page 20

Sunlight is a blend of______ colors

Evaluation | Q II. 5. | Page 20

The splitting of white light in to seven colors is called ______.

Evaluation | Q II. 6. | Page 20

The moon ______ sun light.

Evaluation | Q II. 7. | Page 20

The sunlight can be split into its constituent colors using ______.

Evaluation | Q II. 8. | Page 20

Reflection of light from rough surface is called ______ reflection

Evaluation [Page 20]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 1 LightEvaluation [Page 20]

Evaluation | Q III. 1. | Page 20

Say TRUE or FALSE

The image of right hand in a plane mirror looks like a left hand

• True

• False

Evaluation | Q III. 2. | Page 20

Say TRUE or FALSE

Rainbow is formed by dispersion of which light by water drops

• True

• False

Evaluation | Q III. 3. | Page 20

Say TRUE or FALSE

The image formed by the plane mirror is laterally inverted, hence the image seen through the periscope is also laterally inverted

• True

• False

Evaluation | Q III. 4. | Page 20

Say TRUE or FALSE

We see planets because they reflect light from the sun

• True

• False

Evaluation | Q III. 5. | Page 20

Say TRUE or FALSE

We see a book because it reflects the light that falls on its surface

• True

• False

Evaluation | Q III. 6. | Page 20

Say TRUE or FALSE

The image formed in a pinhole camera is always inverted

• True

• False

Evaluation | Q III. 7. | Page 20

Say TRUE or FALSE

The image formed in a pinhole camera is always the same size as the object

• True

• False

Evaluation | Q III. 8. | Page 20

Say TRUE or FALSE

The image formed in a plane mirror is upside down

• True

• False

Evaluation | Q III. 9. | Page 20

Say TRUE or FALSE

A plane mirror is opaque

• True

• False

Evaluation | Q III. 10. | Page 20

Say TRUE or FALSE

A shadow is formed on the same side of the object as the source of light.

• True

• False

Evaluation | Q III. 11. | Page 20

Say TRUE or FALSE

we are able to see things around us with the help of regular reflection

• True

• False

Evaluation | Q III. 12. | Page 20

Say TRUE or FALSE

After passing through a prism, white light splits into a band of seven colours

• True

• False

Evaluation [Page 20]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 1 LightEvaluation [Page 20]

Evaluation | Q IV. 1. | Page 20

Match the following

 1 Rectilinear propagation Primary source of light 2 Plane Mirror Non-luminous object 3 Fire fly Periscope 4 The Moon Pinhole camera 5 Wide light source Spectrum of light 6 Regular reflection luminous object 7 The sun Penumbra 8 Band of seven colors Glossy surface
Evaluation [Pages 21 - 22]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 1 LightEvaluation [Pages 21 - 22]

#### Answer the following questions in short

Evaluation | Q V. 1. | Page 21

With the help of a diagram, state the laws of reflection

Evaluation | Q V. 2. | Page 21

Figure shows a pencil placed above a mirror

1. Draw its image formed by the mirror
2. Show how light rays from the object are reflected at the mirror to form the image for the eye.
Evaluation | Q V. 3. | Page 21

A person is looking at the image of a tree in a mirror placed 3.5 m in front of him. Given that the tree is at 0.5 m behind his eyes. Find the distance between the image of the tree and his eyes. What are needed to see an object?

Evaluation | Q V. 4. | Page 21

What are luminous objects?

Evaluation | Q V. 5. | Page 21

Is the moon a luminous object?

Evaluation | Q V. 6. | Page 21

What are the three types of materials based on the absorption of light?

Evaluation | Q V. 7. | Page 21

What are the parts of shadow?

Evaluation | Q V. 8. | Page 21

What are the properties of shadow?

Evaluation | Q V. 9. | Page 21

What is plane mirror?

Evaluation | Q V. 10. | Page 21

What is prism?

Evaluation | Q V. 11. | Page 21

What do you mean by visible light?

Evaluation | Q V. 12. | Page 21

Write the items given here in the correct column

(Stars, brick walls, plants, mirror, planets, electric light bulb,candle)

 Sources of Light Objects that reflect light
Evaluation | Q V. 13. | Page 21

A boy of height 1m 45 cm is standing in front of a long mirror at a distance of 2 m. From this information, fill up the following sentences:

1. The distance between the boy and his image is ______
2. The height of the image is______
3. When the boy moves 1m forward, the distance between her and her image is______
Evaluation | Q V. 14. | Page 21

Draw a diagram of a pin hole camera showing the rays of light passing between the Object and its image

Evaluation | Q V. 15 | Page 21

Why is the writing on the front of an ambulance back to front as shown in the picture?

Evaluation | Q C. 16. | Page 21

Explain with examples, why some capital letters look the same in a mirror but others are reversed.

Evaluation | Q V. 17. | Page 21

Two plane mirrors M1 and M2 are placed perpendicular with each other, as shown in figure. The ray AB makes an angle 39 ° with the plane mirror M1, then

1. The reflected rays are ______ ______
2. The incident rays are ______ ______
3. What is the angle of incident corresponding to the ray BC?
4. What is the angle of reflection corresponding to the ray CD
Evaluation | Q V. 18. | Page 22

Rajan was playing with the mirror images of a clock. He looked at the clock in his room. It was showing 1:40. Draw the position of the hands on the real clock and on its mirror reflection. Write below the picture what time each picture is showing.

Evaluation | Q V. 19. | Page 22

What is reflection of light?

Evaluation | Q V. 20. | Page 22

If a ray of light is falling on a plane mirror at an angle of 500 is formed, what will be the angle of reflection?

Evaluation | Q V. 21. | Page 22

What do you mean by lateral inversion?

Evaluation | Q V. 22. | Page 22

How do you obtain a spectrum of light?

Evaluation | Q V. 23. | Page 22

Why do we see white color in Newton’s disc, when we rotate it very fast?

Evaluation | Q V. 24. | Page 22

What is a shadow? What things are necessary for the formation of a shadow?

Evaluation [Page 22]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 1 LightEvaluation [Page 22]

#### Answer the following questions in detail

Evaluation | Q VI. 1. | Page 22

What are regular and irregular reflection? Explain with the help of diagrams

Evaluation | Q VI. 2. | Page 22

What are the difference between luminous and non-luminous objects? Give two examples of each.

Evaluation | Q VI. 3. | Page 22

Write about two everyday situations that tell you that light travels in a straight line.

Evaluation | Q VI. 4. | Page 22

Differentiate between a reflection and a shadow

Evaluation | Q VI. 5. | Page 22

What are the characteristics of an image formed in a plane mirror?

Evaluation | Q VI. 6. | Page 22

Describe the pictures.

Evaluation | Q VI. 7. a. | Page 22

Define the following term

Incident ray

Evaluation | Q VI. 7. b. | Page 22

Define the following term

Reflected ray

Evaluation | Q VI. 7. c. | Page 22

Define the following term

Normal

Evaluation | Q VI. 7. d. | Page 22

Define the following term

Angle of incidence

Evaluation | Q VI. 8. | Page 22

Compare the images formed by plane mirror with that by pinhole camera

Evaluation

## Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide chapter 1 - Light

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide chapter 1 (Light) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Tamil Nadu Board of Secondary Education Class 7th Science Term 3 Answers Guide solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Tamil Nadu Board Samacheer Kalvi textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 7th Science Term 3 Answers Guide chapter 1 Light are Light, Sources of Light, Types of Reflection, A Pinhole Camera, Reflection of Light, Terms Used in Reflection of Light, Law of Reflection of Light, Formation of Shadow, Lateral Inversion, Formation of Image by Reflection: Real and Virtual Image, Luminous and Non-luminous Bodies, Shadow, Eclipses, Rectilinear Propagation of Light, Some Important Terms Related to Light, Concept of Prism, Colour, Dispersion of Light Through Prism and Formation of Spectrum, Speed of Light.

Using Tamil Nadu Board Samacheer Kalvi Class 7th solutions Light exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Tamil Nadu Board Samacheer Kalvi Solutions are important questions that can be asked in the final exam. Maximum students of Tamil Nadu Board of Secondary Education Class 7th prefer Tamil Nadu Board Samacheer Kalvi Textbook Solutions to score more in exam.

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