SCIENCE
Q1. What are magnetic poles?
Q2. In what ways can a magnet get magnetised?
Q3. State some properties of magnet.
Q4. What are Maglev trains?
Q5. Draw diagram of magnetic compass.
Q6. Give four examples of objects that act as sources of light.
Q7. What is meant by rectilinear propagation of light?
Q8. How much time does light take to reach the earth from the sun?
Q9. Differentiate between a shadow and an image.
Q10. What are the characteristics of a shadow?
Answers
Q1. each of the points near the extremities of the axis of rotation of the earth or another celestial body where a magnetic needle dips vertically.
each of the two points or regions of a magnet to and from which the lines of magnetic force are directed.
Q2.To become magnetized, another strongly magnetic substance must enter the magnetic field of an existing magnet. The magnetic field is the area around a magnet that has magnetic force. All magnets have north and south poles. Opposite poles are attracted to each other, while the same poles repel each other.
Q3.They are: Attractive Property – Magnet attracts ferromagnetic materials like iron, cobalt, and nickel. Repulsive Properties – Like magnetic poles repel each other and unlike magnetic poles attract each other. Directive Property – A freely suspended magnet always points in a north-south direction.
Q4. Maglev is a system of train transportation that uses two sets of magnets: one set to repel and push the train up off the track, and another set to move the elevated train ahead, taking advantage of the lack of friction.
Q5. It's in the attachments..please check it.
Q6. A light source is anything that makes light. There are natural and artificial light sources. A few examples of natural light sources include the Sun, stars and candles. A few examples of artificial light sources include light bulbs, lamp posts and televisions.
Q7. Rectilinear propagation of light refers to the propensity of light to travel along a straight line without any interference in its trajectory. When light travels through a medium, say air or water, it follows a straight line. However, the path only changes in case there is a shift in the medium.
Q8. 8 minutes and 20 seconds
Sunlight travels at the speed of light. Photons emitted from the surface of the Sun need to travel across the vacuum of space to reach our eyes. The short answer is that it takes sunlight an average of 8 minutes and 20 seconds to travel from the Sun to the Earth.
Q9. SHADOW:
Shadows are black, whereas images are colourful.
Shadows of objects placed in the sun change in length with the position of the sun through the day. Your shadow will be at its longest at dawn and dusk, whereas it will be at its shortest at noon.
IMAGE:
An image in a plane mirror doesn’t change in size at all; it is always of the same size as that of the object. An image in a mirror can be seen without a screen, whereas it is mandatory to have a screen to form a shadow.
Q10. ◎It is always either large or same size as that of the object.
◎It always black in colour.
◎Its position changes depending upon the position of source of light.
◎it needs a screen for being formed.
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