PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 For a prism of particular and given wavelength the resolving power varies as First power of lens of its base Square of inverse length of its base Increases of length of its base Cube of the length of its base
2 The relation between refractive index an critical angle is. sin C =1/n sin n = 1/C sin c = 1 n = sin C
3 Refraction contributes to the formation of. Rainbows only Mirages only Echo Rainbows and mirages
4 Rainbows and mirage are formed by Reflection only Refraction only dispersion only A combination of refraction, total internal refraction and dispersion
5 A ray of light from air into glass The angle of incidence is 30o if the refractive index of glass in 1.52 The angle of refraction will be. 16.7 <sup>o</sup> 19.3 <sup>o</sup> 29.6 <sup>o</sup> 39.3 <sup>o</sup>
6 Refractive index of a medium is define das. speed of light in vaccum/speed of light in medium Speed of light in medium/Speed of light in vacuum Speed o flight in air/speed of light in medium Speed of light in medium/Speed of light in air
7 Fiber optics system can be used for. Word processing Image processing and receiving Image transmitting All of the above
8 The dioptre power of concave lens of 10 cm focal length is. 0.1 dioptre 1.0 diopter 10 dioptre -10 dioptre
9 Two convex lens focal length 'f' use din combination become telescope. When the distance between them is. 1 4f 2f f/2
10 The power of lens in dioptres is Its focal length in meters The reciprocal of its focal length in metres The reciprocal of length in metres The reciprocal of length in centimetres
11 A bi convex lens of a material of refractive index 1.5 has the radius of curvature of each side equal to 50 cm the power of the lens will be. 0.5 dipotre 1.0 dioptre 1.5 diopter 2.0dioptre
12 If D1 and D2 are the powers of two lenses placed in contact then the power of the combination will be. D1+D2 D1-D2 D1/D2 D1 x D2
13 Parallel rays of light are focused by a thin convex lens.A thin concave lens of the name focal length is then joinjed to the convex lens The focal point will. Shift to infinity shift towards the lens by a small distance shift away from he lens by a small distance Remain at its original position
14 The power of a convex lens is 5 D at what distance the object should be placed from the lens so that its real and 2 times larger image is formed. 25 cm 30 cm 35 cm 40 cm
15 A convex lens of focal length 6 cm to be used to from a virtual image three times the size of the object Where must the lens be placed. 1 cm 2 cm 3 cm 4 cm
16 A convex mirror is used to reflect light from an object placed 66 cm in front of the mirror. The focal length of the mirror is 46 cm Find the location of the image. 23 cm -23 cm -27 cm 27 cm
17 The focal length of a thin converging lens is 10 cm What is the maximum distance from the lens that the object can be placed so that the lens acts as a magnifying glass. 5 cm 10 cm 15 cm 20 cm
18 Reciprocal of the focal length is called. Radios of curvature of the lens Power of the lens Aperture of the lens Resolving power
19 The relation between angle of incidence and angle of refraction is known as. Snell's law Refractive index Index of refraction All of the above
20 When a ray light is incident at anacute angle to the boundary of the media the refracted ray. Bends away from the normal Bends towards the normal Remains undedicated Is totally reflected
21 When a ray of light is incident perpendicularly to the boundary of two media. It pass through without bending It is speed is faster int he optically denser medium It derivates from its original path It is totally reflected back
22 When the angel of incidence becomes larger than the critical angle no refraction occurs This is known is. Diffraction Refraction Total internal reflection Diffuse reflection
23 The angle of incidence that causes the refracted ray in the rarer medium to bend though 90o is called. Critical angle solid angle Plane angle Acute angle
24 When a ray of light traveling in a rare medium enters into a denser medium It remains undeviated It is reflected back It bends towards the normal It bends away from the normal
25 When a ray of light travelling in a denser medium enters into a rarer medium. It remains undeviated It is reflected back It bends towards the normal It bends away from the normal
26 The critical angle for a beam of light passing from water into air is 48.8 o This mean that all light rays with an angle of incidence greater than this angle will be. Absorbed Totally reflected Partially reflected and partially transmitted Totally transmitted
27 If a ray of light in glass in incident on an air surface at an angle greater than the critical angle, the ray will Refract only Reflect only Partially refract and partially reflect Diffract only
28 Image formed by a camera is Real, inverted, and diminished Virtual, upright and diminished Virtual, upright and magnified Real, inverted and magnified
29 Which type of image is produced by the converging lens of human eye if it views a distant object. <div>Real, erect, same size</div> <div>Real, inverted, diminished</div> Virtual, erect, diminshed Virtual, inverted, magnified
30 What is true is real images formed by a converging lens. they are inverted They are on the same side of the lens as the object They can never be shown on a screen They cannot be seen
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