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Science Assertion - Reasoning (1 Marks)

MODEL PAPER 3 · CBSE STD 10 (CBSE - English Medium). 4 questions.

Questions

Assertion - Reasoning (1 Marks)

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4 questions · timed · auto-graded

Question 11 Mark
Assertion (A): In the following chemical equation,
$CuO ( s )+ Zn ( s ) \rightarrow ZnO ( s )+ Cu ( s )$
Zinc is getting oxidised and copper oxide is getting reduced.
Reason (R): The process in which oxygen is added to a substance is called oxidation whereas the process in which oxygen is removed from a substance is called reduction.
Answer
(a) Both A and R are true and R is the correct explanation of A.
Explanation: Both A and R are true and R is the correct explanation of A.
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Question 21 Mark
Assertion (A): XX chromosome give rise to female child whereas XY give rise to male child.
Reason (R): The Y chromosome in males is small than X chromosome.
Answer
(b) Both A and R are true but R is not the correct explanation of A.
Explanation: Smaller Y chromosome, does not decide the gender of the child. Its presence is important not the size. Thus both assertion and reason are true, but reason is not the correct explanation of the assertion.
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Question 31 Mark
Assertion (A): The strength of the magnetic field produced at the centre of a current-carrying circular coil
increases on increasing the number of turns of the circular coil.
Reason (R): Magnetic field strength is directly proportional to the number of turns of the circular coil.
Answer
(a) Both A and R are true and R is the correct explanation of A.
Explanation: Both A and R are true and R is the correct explanation of A.
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Question 41 Mark
Assertion (A): CFCs deplete the ozone layer.
Reason (R): CFCs are used as refrigerants and in fire extinguishers.
Answer
(a) Both A and R are true and R is the correct explanation of A.
Explanation: The ozone layer is getting depleted at the higher levels of the atmosphere due to the effect of chlorofluorocarbons (CFCs) which are used as refrigerants and in fire extinguishers.
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Assertion - Reasoning (1 Marks) - Science STD 10 Questions - Vidyadip