GSc. Class - VIII
Chemical Effects of Electric Current
ASSIGNMENT (revision worksheet)
Q1. What do you understand by chemical effect of current?
Q2. Differentiate between conductors and insulators with examples.
Q3. Why distilled water isused an insulator? How can it be made a conductor?
Q4. What are electrodes? Name two elements that can be used to make electrodes.
Q5. List the various chemical effects produced when electric current is passed through a conducting solution.
Q6. What happens when electric current passes through water by keeping two electrodes immersed in it?
Q7. What is electroplating? Give its three uses.
Q8. What is the disadvantage of electroplating?
Q9. Describe an experiment to show the process of electroplating. Alsoexplain in detail why we find a coating of copper on the negative electrode.
Q10. You are given a carbon rod, a copper plate and copper sulphate solution. Explain the arrangement you will do to get a coating of copper on the carbon rod.
Q11.Give reasons for the following:
1. Chromium is used for electroplating.
2. Iron cans used for storing food items are electroplated with tin.
3. Bridges and automobiles are either painted or coated with zinc to prevent rusting. Why aren’t they electroplated?
4. We should never handle electrical appliances with wet hands.
Science Class - VII
MOTION AND TIME
Q1. Define speed. State its S. I. unit.
Q2. Differentiate between uniform and non-uniform motion.
Q3. Describe a simple pendulum. Draw a diagram. What kind of motion does it show?
Q4. For a simple pendulum; define:-
a) One oscillation
b) Time period
c) Frequency
Q5. A truck travels a distance of 540 km in 4.5 hours. Calculate its speed.
Q6. The distance between two stations is 1995 km. How much time it will take to cover this distance at an average speed of 19 km/h?
Q7. A car takes 20 minutes to cover a distance of 15 km. Calculate its speed in km/h.
G.Sc. CLASS - VI
LIGHT SHADOWS AND REFLECTIONS
Q1. What are luminous and non-luminous objects? Give examples.
Q2. Differentiate between transparent, translucent and opaque objects with examples.
Q3. What is a shadow? How is it formed?
Q4. List the conditions essential for the formation of a shadow.
Q5. Classify the following as transparent, translucent and opaque objects:
a)Stone f) Wood
b)Wax paper g) Smoke
c)Reading glasses h) Leather
d)Common salt i) Blood
e)Skin of a drum j) Dense fog
Q6. What type of shadows are formed by transparent, translucent and opaue objects?
Q7. Why do we not see the shadow of aeroplanes and birds flying in the sky?
Q8. State the principle behind the working of a pinhole camera. Describe in detail how youwill make a simple pinhole camera at home.
Q9. List the characteristics of the image formed in a pinhole camera.
Q10. Describe an activity to show that light travels in a straight line.
Q11. Define reflection of light.
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