An object 5 mm high forms an image 1 cm high. What magnification does the lens produce?
Correct answer B. 2
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Physics MCQs
Page 13 of Physics multiple-choice questions with answers. Tap an option to check yourself.
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How does the least distance of distinct vision change with age?
Correct answer A. It increases with age
Two convex lenses, each of focal length f, are placed in contact. What is the focal length of the combination?
Correct answer A. f/2
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In normal adjustment, what is the length of an astronomical telescope?
Correct answer A. fo + fe
What kind of final image does a compound microscope produce?
Correct answer B. Virtual and inverted
In a multimode step-index optical fibre, how do the refractive indices of the core and cladding compare?
Correct answer A. They are different, with the core's index higher than the cladding's
A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. Using the sign convention, what is the focal length of the combination?
Correct answer A. f1f2/(f2 + f1)
A convex lens with a large aperture fails to bring incident rays to a single focus. What defect does it suffer from?
Correct answer A. Spherical aberration
What is the least distance of distinct vision for a normal eye?
Correct answer B. 25 cm
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How does the magnifying power of a simple microscope depend on focal length?
Correct answer C. It increases with decrease in focal length
If an object is placed beyond 2F of a converging lens, what kind of image is formed?
Correct answer C. Real and inverted
What is the sign of the power of a concave lens?
Correct answer C. Negative
What is the unit of the power of a lens?
Correct answer D. Dioptre
What is the diameter of a lens called?
Correct answer D. Aperture
What is a lens called that brings a beam of parallel rays to a point?
Correct answer A. Converging (convex) lens
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According to de Broglie’s interpretation, how does an electron move in its orbit?
Correct answer B. Standing wave motion
What does the Compton effect prove?
Correct answer B. Photon theory of light
Which law states that the energy radiated by a black body is directly proportional to the fourth power of its Kelvin temperature?
Correct answer D. Stefan's law
To confine an electron within a box of radius 10⁻¹⁴ m, what would its speed need to be?
Correct answer D. Greater than the speed of light
What is the uncertainty in momentum and position due to?
Correct answer A. Property of matter and radiation