# FSC Physics MCQs Chapter 10 Class 11

NUST entry test 2023 NET contains most of the Physics MCQs. FSC Part 1 physics book MCQs. HSSC physics questions MCQs. Solved Chapterwise physics MCQs for first-year 11 class MCQs. Second-year and first-year physic textbooks chapter-wise MCQs with the answer are provided here. PakLearningSpot PLS MCQs Bank website for FREE Entry test preparations

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Physics Ch 10 Class 11 OPTICAL INSTRUMENTS

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Monochromatic light means the light having:

NUMS 2018
Physics
Optics, Nature of Light and Optical Instruments
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Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is

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If a single convex lens is placed close to the eye, it can be used as a

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What should the distance of an object from a convex lens of focal length f=10 cm in order to produce an erect image twice as large as the object?

NTS 2019
Physics
Optics, Nature of Light and Optical Instruments
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Laser beam can be used to generate three dimensional objects in a process called:

NUMS 2017
Physics
Optics, Nature of Light and Optical Instruments
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Final image produced by a compound microscope is

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The film of oil on water shows colour pattern when illuminated by white light due to:

NUMS 2018
Physics
Optics, Nature of Light and Optical Instruments
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A diffraction grating has 500 lines per mm, its grating element d is equal to:

UHS 2018
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The least distance of distinct vision for normal eye is approximately

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The property of light, bending around obstacles and spreading of waves into the geometrical shadow of an obstacle is called ______.

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Physics
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Spherical aberration can be reduced by using

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A camera of 6-cm focal length is used to photograph a distant scene. The distance from the lens to the image is approximately:

NTS 2016 SMBBMC
Physics
Optics, Nature of Light and Optical Instruments
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A convex lens gives a virtual image only when the objects leis

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In a Young’s double-slit experiment, fringes are very close to each other. How can we increase the distance between fringes?

PMC Practice 1
Physics
Optics, Nature of Light and Optical Instruments
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In Young’s double-slit experiment, if d is the separation between two slits 1 is the wavelength of light and θ is the angle of the line from the centre of slits to the point of observation on the screen; then for maxima (bright fringe); the formula is _________.

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A double convex lens acts as a diverging lens when the object is placed

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least distance of distinct vision

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The polarization of light by tourmaline crystals is due to the ______effect.

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Physics
Optics, Nature of Light and Optical Instruments
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In Young’s Double slit experiment, if the spacing between the slit is doubled and the linear distance from the screen is reduced to one half then the spacing between the two adjacent bright fringes will be ____ of actual value.

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The electrical signals change into light signals for transmission through optical fibre. A light pulse
represent.

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Critical angle is that incident angle in denser medium for which angle of refraction is.

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Lasers are used for producing an intense, ____ and coherent beam of visible light.

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A spectrometer is used to find.

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A line normal to the wavefront, showing the direction of the propagation of light is called the:

PMC Practice 2
Physics
Optics, Nature of Light and Optical Instruments
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The least distance of distinct vision for a normal eye is

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If a convex lens of large aperture fails to converge the light rays incident on it to a single point, it is said to
suffer form

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If a convex lens of focal length ‘f’ is cut into two identical halves along the lens diameter, the focal length
of each half is.

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Michelson measured the length of a standard meter in terms of the wavelength of:

PMC Practice 2
Physics
Optics, Nature of Light and Optical Instruments
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Dispersional effect may produced error in light signals. This type of error is minimum in.

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Magnifying power of simple microscope

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The diameter of a lens is called

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In multimode step index fibre the refractive index of core and cladding is

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The interference of green photon to red photon will cause:

PMC Practice 1
Physics
Optics, Nature of Light and Optical Instruments
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A lens which converges a beam of parallel rays to a point is called

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In a scanning electron microscope, image formed is:

PMC Practice 1
Physics
Optics, Nature of Light and Optical Instruments
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The property of light, bending around obstacles and spreading of waves into the geometrical shadow of an obstacle is called ______.

NUMS 2019 Reconduct
Physics
Optics, Nature of Light and Optical Instruments
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A convex lens of focal length ‘f1’and a concave lens of focal length ‘f2’ are placed in contact. The focal
length of the combination is

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The minimum distance between an object and its real image in a convex lens is

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Coherent source of light means?

PMC Practice 3
Physics
Optics, Nature of Light and Optical Instruments
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The magnifying power of a compound microscope in terms of the magnification of the objective and
magnifying power of the eyepiece is given by

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A convex and concave lens of focal length ‘f’ are in contact, the focal length of the combination will be.

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Red light is used in photographic dark room because of:

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The objective of a microscope is a lens of

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In going form a denser to rarer medium a array of light is

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If placed in contact, the focal length of the combination of two convex lenses of equal focal lengths f,
will be

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An astronomical telescope has Magnifying power 5. If the focal length is 20 cm then what is the focal length of the objective?

NUMS 2019 Cancelled
Physics
Optics, Nature of Light and Optical Instruments
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Which of the following particles has greater wavelengths having the same velocity?

NUMS 2019 Reconduct
Physics
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In Double Slit experiment, the fringe spacing of the diffracted rays increases when:

UHS 2019
Physics
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Light signals passes through multimode graded fibre due to

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White light does not focus to a single point after passing through a convex lens due to

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Dioptre power of an concave lens of 10 cm focal length is

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There is no noticeable boundary between core and cladding.

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If d is the distance of distinct vision, the magnifying power of a magnifying glass of focal length f is

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1. Which one type of fibre is more suitable for transmission of signals in which white light is used?Which one type of fibre is more suitable for transmission of signals in which white light is used?

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Two convex lenses of equal focal length ‘f’ are placed in contact, the resultant focal length of the
combination is

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In a double slit experiment, two slits are 0.2 mm apart with a screen at a distance of 1m. The third bright fringe is found to be displaced at a distance of 7.5 mm from the central fringe. What is the value of the wavelength?

NUMS 2019 Cancelled
Physics
Optics, Nature of Light and Optical Instruments
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If an object is placed away form ‘2f’ of a converging lens, then the image will be

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for normal adjustment, length of astronomical telescope is

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Chromatic aberration can be removed by using

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A point where the incident parallel rays of light converge or appear to diverge after passing through a lens
is called

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The power of a concave lens is

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The light exhibits the phenomena of constructive interference under the situation when it is ______ and ______.

NUMS 2018
Physics
Optics, Nature of Light and Optical Instruments
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A lens, which is thicker at the center and thicker at the edges, is called.

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Wave nature of light is proved by:

PMC Practice 1
Physics
Optics, Nature of Light and Optical Instruments
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Bragg’s Law for measurement of wavelength à. of i-rays, using crystal lattice planes having distance d between each other, for constructive interference for integral multiple of i is.

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Unit of power of a lens is

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