10th science Chapter 10th objective English medium

For chapter 9 click here 👇👇

Chapter 9 heredity and evolution

By vikas lodhi

VENUS BHATNAGAR SCIENCE INSTITUTE INDORE 

                       CHAPTER - 10 

    ( REFLECTION AND REFRECTION OF LIGHTS ) 

Question 1. The image formed by a convex lens is virtual, erect and larger than the object. The position of the object must be:
(a) Between the lens and its focus
(b) At the focus
(c) At twice the focal length
(d) At infinity

Answer: (a) Between the lens and its focus

Question 2. A real image formed by a convex lens is always:
(a) On the same side of the lens as the object
(b) Erect
(c) Inverted
(d) Smaller than the object

Answer: (c) Inverted

Question 3. If an object is moved towards a convex lens, the size of its image:
(a) Decreases
(b) Increases
(c) First decreases and then increases
(d) Remains the same

Ans. (b) Increases

Question 4. An object is placed at a distance of 30 cm from a concave mirror of focal length 15 cm. The image will be:
(a) Real and of same size
(b) Real and magnified
(c) Real and diminished
(d) virtual and magnified

Answer: (a) Real and of same size

Question 5. A concave mirror always forms real and inverted image except when the object is placed:
(a) At infinity
(b) Between F and C
(c) At F
(d) Between F and pole of the mirror

Answer: (b) Between F and C

Question 6. The mirror which has a wide field of view must be:
(a) Concave
(b) Convex
(c) Plane
(d) None of these

Ans. (b) Convex

Question 7. The image formed by a concave mirror:
(a) Is always real
(b) Is always virtual
(c) Can be both real and virtual
(d) None of these

Ans. (c) Can be both real and virtual

Question 8. An object is placed 20 cm from a convex lens of focal length 10 cm. The image must be:
(a) Real and diminished
(b) Real and of same size
(c) Real and enlarged
(d) Virtual and enlarged

Answer: (b) Real and of same size

Question 9. The ratio of the focal length of spherical mirror to its radius of curvature is:
(a) 0.5
(b) 1
(c) 2
(d) 3

Answer: (a) 0.5

Question 10. A real and inverted image of the same size is formed by a concave mirror when the object is placed:
(a) Between the mirror and its focus.
(b) Between the focus and the centre of curvature.
(c) At the centre of curvature.
(d) Beyond the centre of curvature.

Ans. (c) At the centre of curvature.

For chapter no. 11 click here 👇👇

Chapter 11 human eye and colorful world

§ THANKS FOR READING §

©Copyright Venus Bhatnagar science Institute indore( m.p) 

Address :[Kalam House]  6,stadium ground Nanda Nagar indore mp. 

     [Bose House] Puneet-pawan apartment slice A sector B scheme no.78 vijay nagar indore mp. 

Download our android app - "Venus bhatnagar"

By vikas lodhi

#### if you like our contents please comment and share with your friends and classmates. ####

####The special thing do not forget to visit our home page ####

#### For more interesting and knowledgeable content  updates follow us on :

Facebook : Venusbhatnagar78@gmail.com 

Instagram : venus_bhatnagar_official 

YouTube : venus bhatnagar science institute 

Twitter : venus_bhatnagar_official 

Telegram : 6265109693