LIGHT
• The ray which strikes a surface is called (a)reflected ray, (b) incident ray, (c)normal, (d) perpendicular ray. • The ray which comes from the surface after reflection is called (a)incident ray,(b) reflected ray, (c) normal, (d) parallel ray.
• The angle made by the normal with reflecting surface is (a)90 (b) 180 (c) 45(d) 120 .
• The corresponding angle of reflection when angle of incidence is 30 will be (a)45,(b) 30(c) 60 (d) 120 .
• Lateral inversion is formed in images formed by (a) concave mirror, (b) convex mirror, (c) plane mirror, (d) double convex mirror.
• Which of the following part controls the size of the pupil (a)cornea (b) iris (c)ciliary muscle, (d) optic nerve.
• The impression of image is persistent on the retina for (a)1/10, (b) 1/12, (c) 1/16,(d) 1/8 of a second.
• In old age the eye lens become cloudy. This defect is called (a)short sight, (b) long sight, (c) cataract, (d) myopia.
• What is called reflection?
• Write the laws of reflection.
• Distinguish between regular reflection and diffused reflection?
• How can you get multiple images?
• What is called lateral inversion?
• Write the characteristics of image formed by a plane mirror.
• What is the transparent front part of eye called?
• Name the two types of cells present in our retina? What are they sensitive to?
• What is blind spot?
• Define dispersion.
• What steps would you take to protect your eyes?
• Name the system used by visually challenged people for learning.
• The comfortable distance at which one can read with normal eye is (a)20cm, (b)25cm, (c) 35cm, (d) 50cm.
• What enables us to see things around us?
• What care would you take to keep your eyes in good condition? • What happens to your image (1)When you go towards a plane mirror? (2)When you move away from a plane mirror?
• The angle between incident ray and the mirror is 60 What would be the angle of reflection?
CHEMICAL EFFECTS OF CURRENT
• What do you observe in the bulb when the free ends of the wire is immersed in a vessal filled with 1)distilled water 2)salt solution 3)with air?• How does the potato help in identifying the positive terminal of the battery or a cell?
• Magnetic compass shows deflection when some magnetic field is generated/developed/produced nearby.In such a case what will be the deflection of the magnetic needle when 1)more current 2)less current flows?
• In what way does the conductors differ from insulators?
• Electrical appliances should never be handled with wet hands or standing on a wet floor.Why?
• What are LED’s? Which lead will be connected to connected to the negative terminal of the battery or a cell?
• What makes the water a good conductor of electricity?
• State the essential condition for rusting?
• Current flows through a conducting solution.What are the changes observable?.
• What is known as electroplating?Why is electroplating preferred?.
• Why are the cans of tin used for storing food coated on iron?
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