Practice Questions CBSE - Science Class 10 (2023 Boards)

Question 1

Question 2

Question 3 Important

Question 4 Important

Question 5 Important

Question 6

Question 7 Important

Question 8

Question 9 Important

Question 10

Question 11

Question 12 Important

Question 13 Important

Question 14

Question 15 Important

Question 16

Question 17 [Assertion Reasoning] Important

Question 18 [Assertion Reasoning] Important

Question 19 [Assertion Reasoning] Important

Question 20 [Assertion Reasoning]

Question 21 (Choice 1) Important

Question 21 (Choice 2)

Question 22 Important

Question 23

Question 24 Important

Question 25 (Choice 1)

Question 25 (Choice 2)

Question 26 Important

Question 27

Question 28 Important

Question 29 (Choice 1)

Question 29 (Choice 2) Important

Question 30 Important You are here

Question 31 (a)

Question 31 (b) Important

Question 32 (Choice 1)

Question 32 (Choice 2) Important

Question 33 (a)

Question 33 (b)

Question 33 (c) Important

Question 34 (a) - Choice 1

Question 34 (b) - Choice 1 Important

Question 34 (c) - Choice 1

Question 34 (a) - Choice 2 Important

Question 34 (b) - Choice 2]

Question 34 (c) - Choice 2 Important

Question 35 (a) - Choice 1 Important

Question 35 (b) - Choice 1 Important

Question 35 (c) - Choice 1

Question 35 (a) - Choice 2

Question 35 (b) - Choice 2 Important

Question 35 (c) - Choice 2

Question 36 Important

Question 37 (a) - Choice 1 [Case Based]

Question 37 (b) i - Choice 2 [Case Based] Important

Question 37 (b) ii - Choice 2 [Case Based] Important

Question 38 (a) - Choice 1 [Case Based]

Question 38 (b) - Choice 1 [Case Based] Important

Question 38 (c) - Choice 1 [Case Based]

Question 39 (a) - Choice 1 [Case Based] Important

Question 39 (b) - Choice 1 [Case Based]

Question 39 (c) - Choice 1 [Case Based]

Question 39 (d) - Choice 1 [Case Based] Important

Question 39 (d) - Choice 2 [Case Based] Important

Class 10
Solutions to CBSE Sample Paper - Science Class 10

An object of height h is kept at point P in front of a mirror as shown below. The height of the image produced is h'. In the diagram, F is the focus and C is the centre of curvature. 

An object of height - Teachoo.jpg

(a) If the object is now moved to point C, will the height of the image now produced be less than, equal to, or greater than h'? Give a reason for your answer. 

(b) If the focal length of the mirror is 20 cm and the distance between points P and C is 10 cm, determine the distance between the images produced when the object is kept at P and C.

 

Answer.

(a) M = H’/H

  • Image produced in the given case (object between C and F) is greater than the object in size

concave-mirror---object-at-infinity---ray-diagaram---teachoo.jpg

Therefore, M>1.

  • When object is at C, image is also produced at C.

H’=H

concave-mirror---object-at-infinity---ray-diagaram---teachoo.jpg

Therefore, M=1.

Thus the height of the image produced when the object is at C will be less than the image produced when object is between C and F.

(b)

To find the distance between the two images we need to find the image distance when the object is at P and when it is at C.

  • To find the image distance when the object is at P

u = -30 cm 

f = -20 cm 

  • Using mirror formula :
    1/f=1/u+1/v 
  • v1 = -60 cm
  • To find the image distance when the object is at C :
    Since C is the centre of curvature,
    image distance = object distance (i.e.) 
  • v2 = - 40 cm

Distance between the images = |v2| - |v1| = 60 - 40 = 20 cm 

Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class

Ask a doubt
Maninder Singh's photo - Co-founder, Teachoo

Made by

Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo