10TH CLASS SCIENCE GUESS PAPERS 2017-18 JKBOSE PDF DOWNLOAD

10TH CLASS SCIENCE GUESS PAPERS 2017-18 JKBOSE PDF DOWNLOAD

10TH CLASS SCIENCE GUESS PAPERS 2017-18 JKBOSE PDF DOWNLOAD

(PHYSICS)
 (Long Answer Type Questions)

 Q.1. What are Spherical Mirrors? Explain, how a concave mirror is different from a convex mirror?

 Or

 Explain the laws of Refraction of Light. 

• Define Reflect ion.Explain the laws of reflection with the help of suitable diagram. 

• What is Lens fonnula?

Give its sign conventions and assumptions.

 • What is Refraction? What are the Laws of Refraction? 

• Define magnification of a.Spherical mirror. What will be the maanification in case of a plane mirror? 

• Define reflection of light. What are the properties of images formed by a plane mirror? With the help of a ray diagram find the position. nature and size of image formed by a convex lens when an object is placed. 

(a) Beyond 2f 

(b) Between optical centre and principal focus 

• Draw the ray diagram and find the nature. size and position of image formed by convex mirror when the object is placed. 

(a) at infinity

 (b) Between infinity and pole of the mirror. 

• A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed so that size of the image is equal to size of object? Also find power of lens. 

• What are the factors on which the resistance of a conductor depends? 

Derive the relation R = P''. Give the unit of resistivity. (a) Describe the Joules law of heating and derive the relation H = (b) An electric iron of resistance of 2 0 (ohm) takes a current of 5 A. Calculate the heat developed in 30 seconds. 

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