PPSC Physics Chapter 4 Geometrical Optics With Answers

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PPSC Physics Chapter 4 Geometrical Optics

Sr. # Questions Answers Choice
1 The variation of focal length of a lens when we pass from the central portion to periphery is called. Coma Astigmatism Spherical aberration Chromatic aberration
2 Dispersive power of a prism depends upon the wavelength of the light used and is More for large wavelengths Less for large wavelengths More for small wavelengths Less for small wavelengths
3 Which term is used for human eye deflect near sightedness. Myopia Hypermetropia Presbyopia Calaract
4 Which scientist made the fist successful terrestrial measurement of the speed of light Isaac Newton Ole Romer Armand Fizeace Albert Michelson
5 The primary purpose of using a large aperture objective in a telescope is to produce Brighter image Larger image Wider field of view Smaller image
6 A diverging lens may not have Negative focal length Positive focal length One plane surface One convex surface
7 What is zoom lens It is a lens having fixed focal length It is a lens having variable focal length It is a lens used in radii to telescope All of the above
8 A Fly is found to be sitting on a telescope when it is focused towards the moon What effect is expected on the photograph of the moon. Intensity remains unchanged No effect The complete field of view is blocked Coloured image will be seen
9 The function of collimator in spectrometer is to Disperse the light Reflect the light Make the light parallel Diffract the light
10 In a compound microscope magnification will be large if focal length of eyepiece is Large small Equal to that of the objective Larger than that of the objective
11 Which of the following is the cause of failure of a lens to form a sharp and district image of a white object. Spherical aberration Chromatic aberration Distortion Astigmatism
12 The normal adjustment the magnifying power of an astronomical telescope is. fe/fo fo/fe fo+ fe fo -fe
13 If the image is virtual then its distance from the lens is taken. Positive Negative Double Half
14 linear magnification is the ratio between the Distances of object and image from mirror Distances of object and image from the focal point Distance of image and object from the mirror Distance of image from object and the distance of object from mirror
15 The near point of a person is 50 cm and his far point is 200 cm The power of the lenses which his spectacles should have to see clearly distant objects will be. -0.5 D -10 d -1.5 D -2.0 D
16 The near point of a person is 50 cm and his far point is 200 cm The power of the lenses which his spectacles should have for reading will be +D +2D +4D -2D
17 The real depth of a swimming pool is 2 m What is the apparent depth of the pool if the refractive index of water is 1.33 1.0 m 1.5 cm 2.0 m 2.5 m
18 Which of the following are defects is lenses. Chromatic aberration Spherical aberration Astigmation All of the above
19 Which instrument measures the magnification of a telescope. lactometer dynamometer Wattmeter Ammeter
20 Clouds are white because they efficiently scatter sunlight of all Colours Wavelengths Frequencies Phases
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