Science Practice Quiz 91

Q1.According to the provided text, what is the nature of the image always formed by a concave lens?

A. Real, inverted, and on the opposite side of the object B. Virtual, erect, and on the opposite side of the object C. Real, erect, and on the same side of the object D. Virtual, erect, and on the same side of the object

Q2.If the magnification (m) produced by a lens has a positive sign, what does it indicate about the image?

A. The image is real and inverted B. The image is real and erect C. The image is erect and virtual D. The image is inverted and virtual

Q3.If the magnification (m) produced by a lens is calculated as +0.33, what does it imply about the size of the image relative to the object?

A. The image is three times the size of the object B. The image is one-third of the size of the object C. The image is twice the size of the object D. The image is half the size of the object

Q4.For a concave lens with a focal length of -15 cm, if an image is formed at -10 cm from the lens, what is the object-distance (u)?

A. -10 cm B. -15 cm C. -30 cm D. +30 cm

Q5.Based on the provided calculation for a lens, if the image distance (v) is +30 cm, what does the positive sign of 'v' indicate about the image?

A. The image is virtual and erect. B. The image is formed on the same side as the object. C. The image is real and formed on the other side of the optical centre. D. The image is diminished and inverted.

Q6.In the context of lens image formation, what do the negative signs of magnification (m) and image height (h') indicate about the image?

A. The image is virtual and erect. B. The image is formed above the principal axis. C. The image is diminished and real. D. The image is inverted and real.

Q7.How is the power of a lens defined?

A. As the product of its focal length and refractive index. B. As the reciprocal of its focal length. C. As the ratio of image height to object height. D. As the degree of light absorption by the lens.

Q8.How does a convex lens of short focal length affect light rays?

A. It causes them to diverge significantly. B. It bends them through large angles, focusing them closer to the optical centre. C. It focuses them at a greater distance from the optical centre. D. It has no significant effect on the angle of light rays.

Q9.What is the effect of a concave lens with a very short focal length compared to one with a longer focal length?

A. It causes lower divergence. B. It causes higher convergence. C. It causes higher divergence. D. It focuses light rays closer to the optical centre.

Q10.What is the SI unit of power of a lens?

A. Metre B. Dioptre C. Candela D. Ampere

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Science Practice Quiz 91