Class6ScienceGuide

 Unit - 2 Force and Motion Summary 1. The external force that pulls or drags is called force. 2. A force causes motion in a stationary object and stops an object in motion. 3. A force causes an object to accelerate. 4. A force changes the volume of an object. 5. A force changes the shape of an object. 6. Force is measured in Newton units. 7. When an object changes from one place to another, that object is in motion. 8. Movement of objects is of different types, viz   (a) Translational motion (b) Circular motion   (c) Oscillatory motion (d) Random motion 1. Fill in the blank 👉 (a) The motion of a falling piece of paper is called free fall. 👉 (b) The state in which the object is changing its position is called motion. 👉 (c) The reason why a stone thrown from above falls towards the ground is gravity. 👉 (d) To change the shape of an object, force is required. 2. Choose one correct answer from the given answers (a) What is the change in motion of any ...

  Unit - 3 Simple Machine Practice 1. Fill in the blank (a) It is better to cut cloth with scissors than to cut cloth by hand. (b) Penchis is a wedge. (c) Work can be done by using a stove. (d) It helps to make work easier in daily life. (e) When a simple device works, it changes the direction of force. 2. Choose one correct answer from the given answers (a) What is called a simple device? A device to facilitate work Devices to assist in speedy completion of work A device for completing work quickly and easily 👉 All of the above. (b) Which of the following is not a simple device? Bhayang  A wheelbarrow Ghirni 👉 Electric stick (d) In which case the lever exerts more force than the applied force? The distance of load is longer Distance of force is longer Distance between load and force is greater  👉  Load and force are closer 3. Write the answers to the following questions: (a) Which device is called a simple device? 👉 A simple device is a machine t...

Unit - 4  Heat Summary 1. The sun, biofuels, electricity and fossil fuels are the main sources of heat. 2. Solar heat warms the environment, heats water and produces electricity. 3. Wood, straw, straw, organic gas etc. are biofuels. 4. Coal, petrol, diesel, kerosene, etc. obtained from mines are called biofuels. E 5. Heat changes the state and volume of matter. 6. Dark and black colored clothes dissipate heat faster than pale and light colored clothes. 7. Heat is used to warm the body, cook food, dry clothes and other items, It is used in activities such as purifying water, producing goods in factories. Fill in the blanks: (a) The sun is the main source of heat. (b) Water is heated by solar oven. (c) Firewood, straw, straw etc. are called as renewable fuel. (d) Coal, petrol etc. are called non-renewable fuel. (e) Heat changes the state and temperature of matter. (f) When water is heated it becomes steam. (g) When the air is heated,...

 Unit - 5 Light Summary 1. An object that gives light is called a light source. Sun, electric lamp, candle lamp, etc   are sources of light. 2. An object that has its own light is called a luminous object. For example: sun, candle light, electricity Lamps, fire, firecrackers etc. are bright objects. 3. An object that does not have its own light is called an adipta. Unseen objects by the light of others Only visible. Such objects are not visible when they do not receive light from others. 4. Objects that allow light to pass through are called transparent. For example: air, glass etc. are transparent. 5. A material that does not allow light to pass through is called opaque. Like: stone, wood, chalk, soil Adi is opaque. 6. The material that has the appearance of the pakash is called semi-transparent. For example: two are broken. " 7. Light is transmitted from one place to another. Light transmission is always direct It just goes. 8. Pinhole cameras work on the principle that lig...

 Unit - 7 Magnet summary 1. The magnetic force in a magnet is called magnetism. 2. A magnet is a very useful object. 3. A magnet attracts magnetic objects. 4. The strength of the magnet is concentrated towards the side. 5. A magnet kept free to rotate is always “north and south” of the earth Sits down. 6. Like poles of two magnets repel each other and opposite poles attract it happens 7. The north and south poles of a magnet never separate. 8. Objects that are affected by magnets are called magnetic objects. Iron, nickel and cobalt are magnetic objects. 9. The point on the side of the magnet where the magnetic force is concentrated It is called Dhruva. 10. The area around the magnet up to which the magnet affects it is called the electromagnetic field. 3. Write answers to the following questions:   (a) What is magnetism?   (b) Name any four devices in which magnets are used.   (c) When a magnet is suspended in iron dust, more iron dust is drawn towards its si...

 Unit - 6 Sound summary 1. Sound originates from the constant vibration of objects. 2. Sharpness of sound is called sharpness. 3. A child's voice is louder than an adult's. 4. Bigger sounds have higher pitch. 5. The pitch of small sounds is low. 6. A sound with a higher pitch is transmitted to a greater distance. 7. Sound transmission is transmitted as waves. 8. Sound transmission requires a medium. 9. Sound cannot be transmitted without a medium (in zero space). 1. Fill in the blank (a) Sound originates from different objects that are vibrating. (b) Murli Bazau sound is generated. (c) Sound originating from metal is metallic. (d) A sound with more power has more loudness. (e) Sound is transmitted as longitudinal waves. (f) Sound transmission requires a medium. (g) The velocity of sound in air is 340 meters per second. Write answers to the following questions:   (a) When the ringing bell is touched with the hand, the sound stops, why?   (b) Write any four sources ...