Section A
Answer any two questions (1 score each)
1.Which of the following unit of pressure? a)ms-2 , b) m3, c) Nm2, Nm 2. The ability of an object to allow the magnetic field lines of force to pass through it is called________ 3.The reflecting surface of a mirror is called___________
Section B
Answer any six questions (2 scores each)
4.Radius of curvature of a spherical mirror in 30 cm.Calculate the focal length. 5.Complete the ray diagram. 6.Name the type of mirror used to get a) Real and magnified image b) Virtual and magnified image.
7.What use the factors on which the strength of an electromagnet depend? 8.Two properties of a magnetic substance are pessueability and identity. Define each of them.
9.State the advantage of the following. a) The edge of a knife is made very thin b) Basements of buildings are made wide 10. Nose bleeding occur for mountaineers. Give reason for this.
Section C
Answer any two questions (3 score each)
11.Suggest any three methods to reduce friction. 12.List the characteristics of magnetic lives of force.
13.If light falls at angle of 30o at the pole of concave mirror, a)What will be the angle of reflection. b)Give reason for your answer. c)Draw the ray diagram for the same.