MCQ on Sign Convention. Practice Sign Convention Multiple Choice Questions and Explanation.
Practice MCQ Questions with Answers for Sign Convention students will gain deep knowledge in Sign Convention Quiz Questions. You can practice all MCQ Questions for Class 10 Physics with Answers for CBSE Board Exam 2021.
MCQ on Sign Convention
MCQ Which of the following statement is wrong while applying sign conventions for mirrors?
a) Pole of mirror is considered as origin of X-axis
b) Height of object measured above principal axis should be negative
c) Objects should be placed on left of mirror
d) Distances should measured parallel to principal axis and up to pole
Ans: b)
Explanation: b) According to sign conventions height measured above principal axis should be taken as positive.
MCQ Radius of curvature of convex mirror is 60 cm, then focal length of convex mirror is?
a) + 30 cm
b) -30 cm
c) + 60 cm
d) -60 cm
Ans: a)
Explanation: a) f = 1/2 R = 1/2 x 60 = 30 cm, and focus of convex mirror is behind mirror, hence taken as positive.
MCQ Object is kept at distance of 15 cm from convex mirror then which of the following is correct?
a) u = +15 cm
b) u = ±15 cm
c) u = -15 cm
d) all are correct
Ans: c)
Explanation: c) According to sign conventions object distance is considered as negative.
MCQ In an experiment using concave mirror, image of obtained at 40 cm in front of mirror has height of 12 cm, then which of the following is represented correctly?
a) v = + 40 cm, h2 =+12 cm
b) v = -40 cm, h2 =+12 cm
c) v = – 40 cm, h2 =-12 cm
d) v = +40 cm, h2 =-12 cm
Ans: c)
Explanation: c) According to sign conventions image distance in front of mirror is considered as negative and height of image is taken as negative.
MCQ Focal length of convex mirror is taken as ……
a) positive
b) negative
c) either positive or negative
d) all of this
Ans: a)
Explanation: d) According to sign conventions focal length of convex mirror is positive.
MCQ In an experiment of convex mirror, the measurements are recorded as v = 25 cm, f = 10 cm and h2 =10.5 cm, according to sign conventions which of the following is correct?
a) v=-25 cm, f = -10 cm and h2 = -10.5 cm
b) v=-25 cm, f=+10 cm and h2 = -10.5 cm
c) v=+25 cm, f=-10 cm and h2 = +10.5 cm
d) v=+25 cm,f=+10 cm and h2 =+10.5 cm
Ans: d)
Explanation: d) For convex mirror image is virtual and behind mirror hence; v, f and h are positive
MCQ Select the correct statement in case of image formed by concave mirror is virtual.
a) u = -ve, v = – ve, h2 =-ve
b) u = – ve, v = – ve, h2 =+ve
c) u = +ve, v = + ve, h2 = +ve
d) u = -ve, v = + ve, h2 = +ve
Ans: b)
Explanation: b) virtual image formed by concave mirror is on same side and above principal axis
MCQ According to sign conventions used for concave/convex mirror, which is wrong?
a) Height of object above and perpendicular to principal axis is taken as negative(-Y axis)
b) Height of object below and perpendicular to principal axis is taken as positive(+Y axis)
c) Focal length of convex mirror is taken as negative.
d) Focal length of convex mirror is taken as positive.
Ans: c)
Explanation: c) Since focal length of convex mirror is taken as positive.
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