PPSC Physics Chapter 4 Geometrical Optics With Answers

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PPSC Physics Chapter 4 Geometrical Optics

Sr. # Questions Answers Choice
1 For total internal reflection the light rays enter From rarer to denser medium From, denser to rarer medium Medium of same refractive index At an angle 90 <sup>o</sup>
2 What would be the colour of sky n the absence of atmosphere. Blue Indigo Red Black
3 When a light ray enters from air into water then its wavelength. Increases Decreases Become infinity Remains constant
4 Why does a glass plate inside a colorless liquid become invisible The colours of both are same The densities of both are same Their refractive indices are same Their refractive indices are different
5 A concave mirror is used to form an image of the sun on a white screen IF the lower half of the mirror were covered with an opaque card the effect on the image on the screen would be. Negligible To make the image less bright than before To make the upper half of the image disappear To make the lower half of the image disappear.
6 Maximum detail of an object can be seen by a microscope when the object is illuminated by light of. Longer wavelegth Shorter wavelength X -rays Gama rays
7 A Galilean telescope with objective of coal length 30 cm and eyepiece of focal length.8 cm when focused for infinity has length equal to 7.5 cm 2.2 cm 38 cm 240 cm
8 The length of Galilean telescope is given by fo + fe fo- fe 1/fo - 1/fe 1/fo = 1/fe
9 To final image produced by a compound microscope is. Real and inverted Real and erect Virtual and erect Virtual and inverted
10 Image formed by a concave lens is. Real Magnified Virtual Real and magnified
11 The ability's of convex lens to produce convergence in a parallel beam is called its. Magnification Focal length Power Strength
12 Which mirror be used for obtaining a parallel beam of light from a small lamp. Plane mirror Convex mirror Concave mirror All of these
13 Which is defined as the ration of image height of the object height. Linear magnification Angular magnification Magnifying power Resolution
14 When we look at the sky during daytime the light that we see is sunlight that has been absorbed and then re radiated in different directions, This process is called. Scattering Diffusion Mirage Rainbow
15 What would be the colour of sky through hour the day .If the earth has no atmosphere. Blue Red White Black
16 When an obliquely falling ray of light enters from one medium ot another it changes its path this phenomenon is called. Reflection Refraction Diffusion Diffraction
17 The band of colours is called. Spectrum Prism Medley LASER
18 The minimum angle of incidence for which total internal reflection can occur is called. Right angle Acute angle Critical angle Obtuse angle
19 Which law states that the angle of incidence equals the angle of refraction. Law of reflection Law of refraction Snell's law Hygens's principle
20 The working principal of a photograph enlarger is basically the same as that of a. Camera Side projection Microsopce Telecopse
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