NCERT Class 7 Science Chapter 15 - Light


Chapter 15 - Light

Question and Answers
Question 1: Fill in the blanks

a) An image that cannot be obtained on a screen is called virtual image.
b) Image formed by a convex
mirror is always virtual and smaller in size.
c) An image formed by a
plane mirror is always of the same size as that of the object.
d) An image which can be obtained on a screen is called a
real image.
e) An image formed by a concave
lens cannot be obtained on a screen.


Question 2: Mark ‘T’ if the statement is true and ‘F’ if it is false.
a) We can obtain an enlarged and erect image by a convex mirror. (False)
b) A concave lens always forms a virtual image. (
True)
c) We can obtain a real, enlarged and inverted image by a concave mirror. (
True)
d) A real image cannot be obtained on a screen. (
False)
e) A concave mirror always forms a real image. (
False)

Question 3: Match the items given in Column I with one or more items in Column II.

Question 4: State the characteristics of the image formed by a plane mirror.
Answer:
The characteristics of the image formed by a plane mirror are:
1. Image distance and object distance are equal.
2. Size of the objects and images are equal.
3. The image formed is erect and virtual.

Question 5: Find out the letters of English alphabets or any other languages known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.
Answer:
Alphabets like A, H, I, M, O, T, U, V, W, X and Y form images in a plane mirror exactly like the letter itself.

Question 6: What is a virtual image? Give one situation where a virtual image is formed.
Answer:
The image that cannot be obtained on a screen is called virtual image. The image formed by a plane mirror is virtual. The image formed by a plane mirror is virtual.

Question 7: State two differences between a convex and a concave lens.
Answer:
Convex lens
*It is thick in the middle and thin at the edge.
*Image formed is real.
Concave lens
*It is thin in the middle and thick at the edges.
*Image formed is virtual.

Question 8: Give one use each of a concave and a convex mirror.
Answer:

Concave mirror: It is used in headlights of various vehicles.
Convex mirror: It is used as side view mirrors in vehicles.

Question 9: Which type of mirror can form a real image?
Answer:
The concave mirror can form a real image.

Question 10: Which type of lens forms always a virtual image?
Answer:
Concave lens forms always forms a virtual image.

Question 11: A virtual image is larger than the object can be produced by a
a) Concave lens
b) Concave mirror
c) Convex mirror
d) Plane mirror
Answer:
b) Concave mirror

Question 12: David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror. Then the distance between David and his image will be
a) 3 m
b) 5 m
c) 6 m
d) 8 m
Answer:
c) 6 m

Question 13: The rear view mirror of a car is a plane mirror. A driver is reversing his car at the speed of 2m/s. The driver sees in his rear view mirror the image of a truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be
a) 1 m/s
b) 2 m/s
c) 4 m/s
d) 8 m/s

Answer:
c) 4 m/s

No comments:

Post a Comment

Also read!

Click on any of the below text for additional links:

Class 6

Class 6 Computer Kips Solutions
Class 6 Gul Mohar English Solutions
→ Class 6 Map Pointing Solutions
Class 6 NCERT Civics Solutions
Class 6 NCERT Geography Solutions
Class 6 NCERT History Solutions
Class 6 NCERT Maths Solutions
Class 6 NCERT Science Solutions

Class 7

Class 7 Computer Kips Solutions
Class 7 Gul Mohar English Solutions
English Grammar Class 7
English Writing Skills Class 7
Class 7 Map Pointing Solutions
Class 7 NCERT Civics Solutions
Class 7 NCERT Civics Notes
Class 7 NCERT Civics Extra Questions
Class 7 NCERT Geography Solutions
Class 7 NCERT Geography Notes
Class 7 NCERT Geography Extra Questions
Class 7 NCERT History Solutions
Class 7 NCERT History Notes
Class 7 NCERT History Extra Questions
Class 7 NCERT Maths Solutions
Class 7 NCERT Science Solutions
Class 7 NCERT Science Notes
Class 7 NCERT Science Extra Questions

Class 8

Class 8 Kips Artificial Intelligence Solutions
Class 8 Gul Mohar English Solutions
English Grammar Class 8
English Writing Skills Class 8
Class 8 Map Pointing Solutions
Class 8 NCERT Civics Solutions
Class 8 NCERT Civics Notes
Class 8 NCERT Civics Extra Questions
Class 8 NCERT Geography Solutions
Class 8 NCERT Geography Notes
Class 8 NCERT Geography Extra Questions
Class 8 NCERT History Solutions
Class 8 NCERT History Notes
Class 8 NCERT History Extra Questions
Class 8 NCERT Maths Solutions
Class 8 NCERT Science Solutions
Class 8 NCERT Science Notes
Class 8 NCERT Science Extra Questions
Class 8 NCERT Science Exemplar
Class 8 NCERT Science MCQs

Class 9

Class 9 Kips Artificial Intelligence Solutions
Class 9 Map Pointing Solutions
Class 9 NCERT Civics Solutions
Class 9 NCERT Geography Solutions
Class 9 NCERT History Solutions
Class 9 NCERT Maths Solutions
Class 9 NCERT Science Solutions

Class 10

Class 10 Kips Artificial Intelligence Solutions
Class 10 NCERT English Solutions
→ Class 10 Map Pointing Solutions
Class 10 NCERT Civics Solutions
Class 10 NCERT Civics Notes
Class 10 NCERT Civics Extra Questions
Class 10 NCERT Geography Solutions
Class 10 NCERT Geography Notes
Class 10 NCERT Geography Extra Questions
Class 10 NCERT History Solutions
→ Class 10 NCERT History Notes
Class 10 NCERT History Extra Questions
Class 10 NCERT Maths Solutions
Class 10 NCERT Science Solutions
Class 10 NCERT Science Notes
Class 10 NCERT Science Extra Questions

Computer Languages

Python Basics

Extra Activities

Extra Activities

Extra Knowledge

Extra Information
General Knowledge
Historical Places in India
Latest technology
Physical Sciences
Facts

• Mathematics quick links
Mathematical Terms
Maths Tricks

Home Top