Living Science Physics Class 7. We covered all the Living Science Physics Class 7 MCQs in this post for free so that you can practice well for the exam.
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Living Science Physics Class 7 Objective for Students
Which one of the following statements is correct for a plane mirror?
(a) Its focal length is zero.
(b) The size of the image of an object placed in front of the mirror is slightly less than that of the object.
(c) The image is virtual, erect, and laterally inverted.
(d) Its focal length is 200 cm.
Option c – The image is virtual, erect, and laterally inverted
An object is placed in front of a convex mirror. Which one of the following statements is correct?
(a) It will never form an inverted image.
(b) The image moves towards the focus when the object moves towards the mirror.
(c) Depending on the position of the object with respect to the mirror, the image can be inverted and real.
(d) The size of the image becomes larger than that of the object when the object is placed at a distance equal to half the focal length.
Option a – It will never form an inverted image
Which one of the following statements about the law of conservation of mass is correct?
(a) A given compound always contains exactly the same proportion of elements.
(b) When gases combine in a reaction, they do so in a simple ratio by volume, provided all gases are at room temperature.
(c) Matter can neither be created nor destroyed.
(d) Equal volumes of all gases at the same temperature and pressure contain an equal number of molecules.
Option c – Matter can neither be created nor destroyed
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