MAHARISHI VIDYA MANDIR CBSE SCHOOL, THANJAVURClass: VIII FORMATIVE ASSESSMENT – IV Marks : 25Sub : PHYSICS PEN AND PAPER ASSESSMENT

1. The small circular aperture present in the center of iris is known as the (1)a) Cornea b) retina c) pupil d) cone

2. An icy celestrrial body that appear again and again after regular intervals, is the (1)a) Ceres b) phobos c) halley’s comet d) Sirius

3. Complete the ray diagram showing the the path of rays in the diagram given here (1)

4. Out of incidence and refracted angle, which is greater when light ray travels from glass to air? (1)

5. Define one light year? (1)6. Why do we see phases of moon? (2)7. Why part of the pencil immersed in water appears to be bent and thicker when viewed from

side? (2)8. How pole star is located in the sky? (2)9. What do you mean by the persistence of vision and accommodation of the eye? (2)10. Name a natural effect based on dispersion of sunlight. State in brief the reason for the

dispersion. (3)11. Radha’s grandmother often complained of hazy vision. A) name the eye defect she may be

suffering from? B) what may be the possible reason behind this defect? C) state any one possible way that could improve her vision (3)

12. A) State three characteristics of the image formed by a convex lens when an object is placed between its F and 2F points. B) a convex lens produces a virtual and erect image, what will be the position of the object? C) mention any two practical devices that make use of convex lenses (3)

13. Fill in the blanks: (3)a) The planet which is farthest from the sun is _____b) The planet which appears reddish in colour is ______c) A group of star that appear to form a pattern in the sky is known as a ___d) A celestial body that revolves around a planet is known as a _______e) Shooting stars are actually not ___________f) Asteroids are found between the orbits of ________ and _____