Practice Questions CBSE - Science Class 10 (2023 Boards)

Question 1

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Question 2

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Question 3 Important

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Question 4 Important

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Question 5 Important

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Question 6

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Question 7 Important

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Question 8

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Question 9 Important

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Question 10

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Question 11

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Question 12 Important

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Question 13 Important

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Question 14

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Question 15 Important

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Question 16

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Question 17 [Assertion Reasoning] Important

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Question 18 [Assertion Reasoning] Important

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Question 19 [Assertion Reasoning] Important

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Question 20 [Assertion Reasoning]

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Question 21 (Choice 1) Important

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Question 21 (Choice 2)

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Question 22 Important

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Question 23

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Question 24 Important

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Question 25 (Choice 1)

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Question 25 (Choice 2)

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Question 26 Important

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Question 27

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Question 28 Important

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Question 29 (Choice 1)

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Question 29 (Choice 2) Important

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Question 30 Important

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Question 31 (a)

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Question 31 (b) Important

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Question 32 (Choice 1)

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Question 32 (Choice 2) Important left arrow to signify that you are on this page You are here

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Question 33 (a)

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Question 33 (b)

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Question 33 (c) Important

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Question 34 (a) - Choice 1

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Question 34 (b) - Choice 1 Important

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Question 34 (c) - Choice 1

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Question 34 (a) - Choice 2 Important

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Question 34 (b) - Choice 2]

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Question 34 (c) - Choice 2 Important

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Question 35 (a) - Choice 1 Important

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Question 35 (b) - Choice 1 Important

down arrow in sibling posts in Teachoo

Question 35 (c) - Choice 1

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Question 35 (a) - Choice 2

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Question 35 (b) - Choice 2 Important

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Question 35 (c) - Choice 2

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Question 36 Important

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

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

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

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

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

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

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

down arrow in sibling posts in Teachoo

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

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

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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) Direct contact between which of the three coloured wires will result in a short circuit?

(b) State what happens to the current in the circuit in the case of a short circuit. Give a reason for your answer.

 

Answer:

(a) 

  • The red wire is the live wire connecting to the positive input.
  • The black wire is the neutral wire connecting to the negative input. 
  • The green wire is the Earth wire , for leakage currents to prevent shocks
  • For short circuits , the positive and the negative wires should be connected

Hence, contact between the red and the black wire would lead to a short circuit.

(b) In case of a short circuit, there is a drastic increase in the amount of current flowing through a wire. 

This is due to a drastic decrease in the resistance in the wire/circuit. 

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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