Std: 6 CHAPTER 11 to 15 SCIENCE SEM 2

SSSV STUDY MATERIAL PURVESH SIR (Ph): 9429976149

Q 1 Blanks/MCQ:1). AN example of a standard unit of measurement is ..................................................................(a) hand span (b) pace (c) yard (d) inch2). Metre is the SI unit of .......................................................................3). 2500 m equals ............................................................ cm.4). A car moving on a straight road is in ............................................................................. motion.5). An object is said to be in motion it its position (with respect to another object) ....................................................................................................(a) changes with time (b) does not change with time(c) does not change (d) is the same as before6). ................................................................................ is a non standard unit of length.(kilometer/cubit)7). The distance of an object from one end to the other is called .......................................................8). A type of motion that repeats itself after equal intervals of time is called .......................................................................................9). When a body is in translational motion, all its parts move ....................................................... distances in a given time.10). The rotation of Earth on its axis is ...................................................................................... motion.11). A unit that has fixed quantity and does not vary from person to person and place to place is called a ..........................................................................................................................12). A motion that does not repeat itself at regular intervals or a motion that does not repeat itself at all is called ..................................................................................................................... motion.13). A fixed quantity with respect to which a physical quantity is measured is called ..........................................................................................14). The standard unit of length is ......................................................................15). Magnet attracts .................................................................... (iron/ wood)16). Every magnet has .......................................................... poles.17). Magnetic forces are the strongest at the ................................................................ of the magnet.18). When like poles are brought close to each other, they ...............................................................19). Only .............................................................................. materials are attracted by magnets.20). Like poles of two magnets ................................................................. each other.21). A magnet that retains its properties for a very long period of time is called ................................................................................................. magnet.22). A horseshoe magnet should be stored with a piece of ....................................... across its poles.23). A ............................................................................................................ is a device used to find directions.24). The Earth acts like a giant .............................................................................................25). How many poles does a magnet have? ..........................................................26). The North Pole of a magnet will attract the .........................................................................................27). Which of the following materials is the most appropriate to make a good temporary magnets? ................................................................................(a) iron (b) cotton (c) glass (d) wood28). A magnetic compass is generally used to ........................................................................................29). Bar magnets should be stored in ................................................................30). A ........................................................................... magnet should be stored with a piece of soft iron kept across its poles.31). Sun is a/an ................................................................................... source of light.32). ...................................................................... is a transparent material. (clear glass/butter paper)33). Usually light travels in a ............................................................................ path.34). Shadows are formed when light rays are obstructed by ............................................................ objects.35). A shadow only shows the ................................................................... of the object.36). Size of the shadow ........................................................................................................ depending on the distance between the object and screen. (remains constant / may vary)37). A rough and bumpy surface is called a/an ............................................................................. surface.38). Reflection from a ............................................................... surface is called diffused reflection.39). A/An .......................................................................... has the colour of the object. (shadow / image)40). A ..................................................................................................... is just a box with a very tiny hole on one of its side.41). A good example of a smooth surface is a .....................................................................................42). Give an example of a natural source of light. .....................................................................................43). Which of the following is an example of translucent material? ....................................................(a) Clear glass (b) Smoked glass (c) Clean water (d) Clean air44). Which of these will not form a shadow? ....................................................................(a) A child (b) Clear glass (c) A tree (d) A cloud45). The shadow of the an object does not show the ..................................................... of the object.46). Which of these is not a part of a pinhole camera? ..........................................................................(a) Box (b) Tiny hole (c) Lens (d) None of these47). AN area of darkness formed by an opaque object obstructing light is called a .......................................................................................48). A line with an arrow that shows the direction of propagation of light is called .................................................................49). A group of light rays moving in an organized manner is called a ................................................ of light.50). Inside the transparent glass bulb, there is a very thin .................................................... wire.51). A .................................................................. is a device that produces electric current.52). In a dry cell, electricity is produced by ...............................................................................................53). Electric current flows only if the circuit is ....................................................................54). Electric current flows in a ....................................................................... directions.55). When the switch is in the OFF position, the electric circuit is .............................................56). A switch is sometimes referred to as ............................................................57). All metals are ............................................................... conductors of electricity.58). Which of these is not a part of an electric bulb? .............................................................................(a) Powdered manganese dioxide (b) A filament (c) A glass mount (d) Terminals59). The filament of an electric bulb glows because when electric current flows through it, .................................................................................................(a) a chemical reaction takes place (b) the filament heats up (c) the chemical reaction takes place (d) the filament cools down60). Which of these is an example of electric cell? ............................................................................(a) Switch (b) Solar cell (c) Circuit (d) Cell phone61). An electric cell has ......................................................................... terminal/s.62). Which of these is an electric insulator? .................................................................................(a) Graphite (b) Aluminium (c) Pure water (d) Copper63). The part of an electric bulb that glows is called the ......................................................................64). Primary cells ................................................. be recharged once they are used up. (can/cannot)65). An insulator is a ....................................................................... conductor of electric current.66). Wood is an example of .............................................................................. (a conductor/an insulator)67). A device that is used to open or close a circuit is called an ...............................................................68). A path for an electric current to flow is called an .................................................................................69). A device that can be used to produce an electric current is called a .......................................... of electric current.70). How much of Earths water is readily available to us as fresh water? .....................................71). What is water used for drinking known as? .......................................................................................72). The conversion of liquid to its vapour form happens by the process of ....................................................................................73). Which of the following processes play a key role in cloud formation and rain? ............................................................................(a) Evaporation (b) Condensation (c) Respiration (d) Both a & b74). Cloud is a cluster of ......................................................................................................................75). When there is lack of food in the region it causes ....................................................................... 76). Conversion of liquid to its vapour form is called ..........................................................................77). Conversion of vapor to its liquid form is called ...............................................................................78). A condition when ground becomes submerged under water, due to heavy rain is called .........................................................................................79). A structure built on a river to store and hold back water is called ........................................80). Abnormally long period of insufficient or no rainfall is called ........................................................81). Water fit for human consumption is called ...........................................................................82). The release of water vapour into the atmosphere through the leaves of plant is called ..........................................................................................83). A disease affecting thousands of people at the same time is called .............................................84). The process of collecting and storing rainwater from roofs or a surface catchment is called ...............................................................................................................85). The cyclic movement of water from the atmosphere to the Earth and back to the atmosphere through various processes is called ............................................................................................86). Conditions for the formation of a shadow are the presence of:(i) A ................................................................ of light (ii) An ................................................. object(iii) A ............................................................. or ................................................................. behind the object.87). Characteristic of shadow: (i) It is always ................................................................ (ii) It only shows the .................................................... or ................................................ of the object.88). ...................................................... is used to make the negative terminal of a dry cell.89). The electric current flows from the .......................................................... terminal to the ........................................................................ terminal in a electric current.90). The cells that can be recharged once they are drained are called ................................................ cells.Q 2 Write two examples:1). Natural sources of salty water. .................................................................................................................2). Industrial uses of water. .............................................................................................................................3). Ways of saving water. .......................................................................................................................................4). Pollutants of water. .......................................................................................................................................5). Sources of electric current. .....................................................................................................................6). Electric cells. ..............................................................................................................................................7). Devices using batteries that give out light. ............................................................................................8). Conductors. ......................................................................................................................................9). Electric insulators. ............................................................................................................................................10). A non luminous object. ......................................................................................................................11). A transparent object. ................................................................................................................................12). A regular surface for reflection. ..............................................................................................................13). An object whose shadow can be seen. ....................................................................................................14). A magnetic material. ....................................................................................................................................15). A non magnetic material. ...............................................................................................................................16). A device that uses a magnet. .......................................................................................................................17). Rectilinear motion. ........................................................................................................................................... 18). Curvilinear motion. ......................................................................................................................................... 19). Rotational motion. ............................................................................................................................................ 20). Periodic motion. .................................................................................................................................................. 21). Non periodic motion. ..................................................................................................................................... Q 3 True Or False:1). Apart from irrigation and industrial use, water is also used for transportation and recreation. .........................................................................................2). Conversion of liquid to its vapour form is called ..................................................................3). When there is lack of food in the region, it causes epidemic. .......................................................4). Watering by hand saves a lot of water as against using a hose. ...................................................5). A tap is an answer for both drought and flood. .....................................................................6). We cannot turn on or off an electric bulb using a switch. ......................................................7). When the switch is in the OFF position, the electric circuit is open. .............................................8). A switch is sometimes referred to as key. ..........................................................................9). An insulator is a material through which an electric current cannot flow. ................................10). All metals are bad conductors of electricity. ..........................................................................11). We can see an object clearly through a translucent material. .......................................................12). Shadows are formed only during the day. ...................................................................13). A shadow is formed when an opaque object blocks the light falling on it. ............................14). An inverted image is formed in a pin hole camera. .......................................................15). Temporary magnets retain their magnetic properties for a long period of time. ....................16). Permanent magnets are made from mixture of iron, cobalt and nickel. .....................................17). A magnet may lose its properties even if it is dropped from a great height. .........................18). Bar magnets should not be stored in pairs. ......................................................19). Magnets can be used for picking up substances made of wood in a scrapyard. .....................20). Not all objects are attracted to magnets. ................................................21). The North Pole and the South Pole of a magnet always come in pairs. ..............................22). The magnetic compass always points in the east west direction. .............................................23). The cubit is an example of a standard measurement of length. ..........................................24). The commonly used for measuring large distance is kilometer. ..............................................25). The SI unit of length is millimeter. ...........................................................

Q 4 Convert the following: (i) 250 cm = ...................................... mm (ii) 5000 m = ............................ km (iii) 200 km = .................................................... cm.Q 5 Answer in One word:1). Artificial watering system. ................................................................................2). Conversion of liquid to its vapour form. ........................................................................3). Conversion of vapour to its liquid form. ...........................................................................4). Loss of water by leaves. .......................................................................................5). Abnormally long period of insufficient or no rainfall. ..............................................................6). Lack of food in a region. .........................................................................7). A condition when the ground remains submerged in water. ........................................................8). A structure built on a river to store and hold back water. .........................................................