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Science Assertion (A) & Reason (B) MCQ

PHYSICS CH6 Light · Tamil Nadu Board STD 9 (Tamil - English Medium). 8 questions.

Questions

Assertion (A) & Reason (B) MCQ

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8 questions · timed · auto-graded

MCQ 11 Mark
Assertion: Incident ray is directed towards the centre of curvature of spherical mirror. After reflection it retraces its path.
Reason: Angle of incidence (i) = Angle of reflection (r) = 0°
  • A
    If both assertion and reason are true and reason is the correct explanation.
  • B
    If both assertion and reason are true and reason is not the correct explanation.
  • C
    If assertion is true but reason is false.
  • D
    If assertion is false but reason is true.
Answer
If both assertion and reason are true and reason is not the correct explanation.
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MCQ 21 Mark
Assertion: For observing the traffic at a hairpin bend in mountain paths a plane mirror is preferred over convex mirror and concave mirror.
Reason: A convex mirror has a much larger field of view than a plane mirror or a concave mirror.
  • A
    If both assertion and reason are true and reason is the correct explanation.
  • B
    If both assertion and reason are true and reason is not the correct explanation.
  • C
    If assertion is true but reason is false.
  • D
    If assertion is false but reason is true.
Answer
 If assertion is false but reason is true.
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MCQ 31 Mark
Assertion : A real image cannot be produced by plane or convex mirror.
Reason : The focal length of a convex mirror is always taken as possitive.
  • A
    If both assertion & reason are true and the reason is the correct explanation of the assertion.
  • B
    If both assertion & reason are true but the reason is not correct explanation of the assertion.
  • C
    If assertion is true but reason is false.
  • D
    If assertion is false but reason is true.
Answer
(e) Assertion is false but reason is true
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MCQ 41 Mark
Assertion : The nature of the image depends on the size of the mirror.
Reason : Small mirrors always form a virtual image.
  • A
    If both assertion & reason are true and the reason is the correct explanation of the assertion.
  • B
    If both assertion & reason are true but the reason is not correct explanation of the assertion.
  • C
    If assertion is true but reason is false.
  • ✓
    If assertion is false but reason is true.
Answer
Correct option: D.
If assertion is false but reason is true.
(d) Assertion & reason both are false
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MCQ 51 Mark
Assertion: The mirrors used in torch lights are parabolic not concave.
Reason: The image formed by concave mirror is always virtual.
  • A
    If both assertion & reason are true and the reason is the correct explanation of the assertion.
  • B
    If both assertion & reason are true but the reason is not correct explanation of the assertion.
  • ✓
    If assertion is true but reason is false.
  • D
    If assertion is false but reason is true.
Answer
Correct option: C.
If assertion is true but reason is false.
(c) Assertion is true but reason is false
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MCQ 61 Mark
Assertion : When an object is placed between two plane mirrors, then all the images found are of equal brightness.
Reason : Only two images are obtained in case of plane-parallel mirrors.
  • A
    If both assertion & reason are true and the reason is the correct explanation of the assertion.
  • B
    If both assertion & reason are true but the reason is not correct explanation of the assertion.
  • C
    If assertion is true but reason is false.
  • ✓
    If assertion is false but reason is true.
Answer
Correct option: D.
If assertion is false but reason is true.
(d) Assertion & reason both are false
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MCQ 71 Mark
Assertion: The focal length of the mirror is /and distance of the object from the focus is $V$ then the magnification of the mirror will be $\left(\frac{f}{f-u}\right)$
${ }^4$ Samacheer Kalvi 9th Science Guide Chapter 6 Light 20
  • ✓
    If both assertion & reason are true and the reason is the correct explanation of the assertion.
  • B
    If both assertion & reason are true but the reason is not correct explanation of the assertion.
  • C
    If assertion is true but reason is false.
  • D
    If assertion is false but reason is true.
Answer
Correct option: A.
If both assertion & reason are true and the reason is the correct explanation of the assertion.
(a) Both assertion & reason are true and the reason is the correct explanation of the assertion
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MCQ 81 Mark
Assertion : The air bubble shines in water.
Reason : Air bubble shines due to refraction of light.
  • A
    If both assertion & reason are true and the reason is the correct explanation of the assertion.
  • B
    If both assertion & reason are true but the reason is not correct explanation of the assertion.
  • ✓
    If assertion is true but reason is false.
  • D
    If assertion is false but reason is true.
Answer
Correct option: C.
If assertion is true but reason is false.
(c) If assertion is true but reason is false
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Assertion (A) & Reason (B) MCQ - Science STD 9 Questions - Vidyadip