Practice Questions CBSE - Science Class 10 (2023 Boards)

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Question 3 Important

Question 4 Important

Question 5 Important

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Question 7 Important

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Question 9 Important

Question 10

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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

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 You are here

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

P and Q represent two straight wires carrying equal current (I) in a direction perpendicular to the plane of the screen outwards. K is the midpoint of the line joining P and Q. The image shows the magnetic field lines around the wire. But the direction of the magnetic field is not marked.

P and Q represent two straight wires - Teachoo.jpg

(a) Draw the above image and mark the direction of the magnetic field.

(b) If the current in the wires is increased, how will the strength of the magnetic field around P and Q change? Draw the magnetic field lines around P and Q to represent this change.

(c) If B is the magnetic field at point K due to the current in wire P, what will be the magnetic field due to P and Q at the midpoint K? Give a reason for your answer.

(d) If B is the magnetic field at point K due to the current in wire P and the current in wire Q is reversed, what will be the magnetic field at midpoint K?

 

Answer:

(a)

(a) P and Q represent two straight wires - Teachoo.jpg

(b) The strength of the magnetic field around P and Q will increase.

(b) P and Q represent two straight wires - Teachoo.jpg

(c) Zero.

The magnetic fields at point K due to current in the wires P and Q are equal in magnitude but opposite in direction. The two fields cancel each other.

(d)

If the current in Q is reversed , the direction of the magnetic field due to Q at K will reverse , to be in the same direction as P .

Thus, the two magnetic fields will be added up to 2B .

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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