Practice Questions CBSE - Science Class 10 (2023 Boards)

Question 1

down arrow in sibling posts in Teachoo

Question 2

down arrow in sibling posts in Teachoo

Question 3 Important

down arrow in sibling posts in Teachoo

Question 4 Important

down arrow in sibling posts in Teachoo

Question 5 Important

down arrow in sibling posts in Teachoo

Question 6

down arrow in sibling posts in Teachoo

Question 7 Important

down arrow in sibling posts in Teachoo

Question 8

down arrow in sibling posts in Teachoo

Question 9 Important

down arrow in sibling posts in Teachoo

Question 10

down arrow in sibling posts in Teachoo

Question 11

down arrow in sibling posts in Teachoo

Question 12 Important

down arrow in sibling posts in Teachoo

Question 13 Important

down arrow in sibling posts in Teachoo

Question 14

down arrow in sibling posts in Teachoo

Question 15 Important

down arrow in sibling posts in Teachoo

Question 16

down arrow in sibling posts in Teachoo

Question 17 [Assertion Reasoning] Important

down arrow in sibling posts in Teachoo

Question 18 [Assertion Reasoning] Important

down arrow in sibling posts in Teachoo

Question 19 [Assertion Reasoning] Important

down arrow in sibling posts in Teachoo

Question 20 [Assertion Reasoning]

down arrow in sibling posts in Teachoo

Question 21 (Choice 1) Important

down arrow in sibling posts in Teachoo

Question 21 (Choice 2)

down arrow in sibling posts in Teachoo

Question 22 Important

down arrow in sibling posts in Teachoo

Question 23

down arrow in sibling posts in Teachoo

Question 24 Important

down arrow in sibling posts in Teachoo

Question 25 (Choice 1)

down arrow in sibling posts in Teachoo

Question 25 (Choice 2)

down arrow in sibling posts in Teachoo

Question 26 Important

down arrow in sibling posts in Teachoo

Question 27

down arrow in sibling posts in Teachoo

Question 28 Important

down arrow in sibling posts in Teachoo

Question 29 (Choice 1)

down arrow in sibling posts in Teachoo

Question 29 (Choice 2) Important

down arrow in sibling posts in Teachoo

Question 30 Important

down arrow in sibling posts in Teachoo

Question 31 (a) left arrow to signify that you are on this page You are here

down arrow in sibling posts in Teachoo

Question 31 (b) Important

down arrow in sibling posts in Teachoo

Question 32 (Choice 1)

down arrow in sibling posts in Teachoo

Question 32 (Choice 2) Important

down arrow in sibling posts in Teachoo

Question 33 (a)

down arrow in sibling posts in Teachoo

Question 33 (b)

down arrow in sibling posts in Teachoo

Question 33 (c) Important

down arrow in sibling posts in Teachoo

Question 34 (a) - Choice 1

down arrow in sibling posts in Teachoo

Question 34 (b) - Choice 1 Important

down arrow in sibling posts in Teachoo

Question 34 (c) - Choice 1

down arrow in sibling posts in Teachoo

Question 34 (a) - Choice 2 Important

down arrow in sibling posts in Teachoo

Question 34 (b) - Choice 2]

down arrow in sibling posts in Teachoo

Question 34 (c) - Choice 2 Important

down arrow in sibling posts in Teachoo

Question 35 (a) - Choice 1 Important

down arrow in sibling posts in Teachoo

Question 35 (b) - Choice 1 Important

down arrow in sibling posts in Teachoo

Question 35 (c) - Choice 1

down arrow in sibling posts in Teachoo

Question 35 (a) - Choice 2

down arrow in sibling posts in Teachoo

Question 35 (b) - Choice 2 Important

down arrow in sibling posts in Teachoo

Question 35 (c) - Choice 2

down arrow in sibling posts in Teachoo

Question 36 Important

down arrow in sibling posts in Teachoo

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

down arrow in sibling posts in Teachoo

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

down arrow in sibling posts in Teachoo

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

down arrow in sibling posts in Teachoo

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

down arrow in sibling posts in Teachoo

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

down arrow in sibling posts in Teachoo

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

down arrow in sibling posts in Teachoo

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

down arrow in sibling posts in Teachoo

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

down arrow in sibling posts in Teachoo

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

down arrow in sibling posts in Teachoo

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

down arrow in sibling posts in Teachoo

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

down arrow in sibling posts in Teachoo

(a) A lens forms a blurred image of an object on the screen as shown below:

A lens forms a blurred image - Teachoo.jpg

What changes can you make to the following to form a sharp and in-focus image on the screen?

(i) object distance

(ii) focal length of the lens

 

Answer:

(a) 

From the diagram we can tell that the object is not at infinity, neither at the focus. 

It can either be at C, between C and F, or between F and O.

 

This can be achieved in two ways:

(i) decrease the object distance 

(ii) increase the focal length

 

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo