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Class 7 (Science assignment)

   Heat and Light Energy Heat and light are two important forms of energy that are essential for life and many activities around us. The Sun is the main natural source of both heat and light energy on Earth. Heat is a form of energy that flows from a hotter object to a colder object. It can cause changes in the temperature and physical state of matter. For example, when ice is heated, it melts into water, and when water is heated sufficiently, it changes into steam. Heat can be transferred from one place to another in three main ways: conduction, convection, and radiation . Conduction is the transfer of heat through a substance without the actual movement of the substance, and it occurs mainly in solids. Metals such as copper and aluminium are good conductors of heat. Convection is the transfer of heat through the movement of fluids such as liquids and gases. Radiation is the transfer of heat in the form of waves and does not require a material medium. Heat from the Sun reach...
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Class 8 ( Math Assignment)

  Basic Mathematical Ability Test Questions Simplify: 3 4 + 5 8 − 1 2 \frac{3}{4}+\frac{5}{8}-\frac{1}{2} Find the value of: 25 %  of  640 25\% \text{ of } 640 A school has 480 students , of whom 55% are girls . How many boys are there? Simplify: 3 x + 7 − 2 x + 5 3x+7-2x+5 Solve the equation: 3 x + 7 = 25 3x+7=25 The ratio of boys to girls in a class is 3 : 2 . If there are 30 boys , how many girls are there? A rectangular playground is 25 m long and 16 m wide . Find its area and perimeter . A shopkeeper buys a school bag for Rs. 800 and sells it for Rs. 920 . Find the profit and profit percentage . A bus travels at an average speed of 45 km/h . How far will it travel in 2 hours 40 minutes ? The angles of a triangle are x ∘ x^\circ , 2 x ∘ 2x^\circ , and 3 x ∘ 3x^\circ . Find the value of x and the three angles. Find the mean of the following numbers: 12, 15, 18, 10, 20, 15 A water tank is in the shape of a cuboid measuring 2 m × 1.5 m × 1 m . a. Find its volume in cu...
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Class 9 (Science assignment)

  Force and Motion Force and motion are important concepts in our everyday life. A force is a push or pull that can change the state of rest or motion of an object. It can also change the direction, speed, or shape of an object. The SI unit of force is newton (N) . Force is a vector quantity because it has both magnitude and direction. The motion of an object is described in terms of distance, displacement, speed, velocity, and acceleration . Distance is the total path travelled by an object, whereas displacement is the shortest distance between its initial and final positions in a particular direction. Speed is the distance travelled per unit time, while velocity is displacement per unit time. Acceleration is the rate of change of velocity with time. According to Newton's laws of motion , an object remains at rest or continues to move with uniform velocity unless an external force acts on it. This property of an object is called inertia . Newton's second law states that th...
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Class 10 (Science assignment)

  Grade 10 Science: Nature and Environment Passage Nature and the environment are essential for the survival of all living organisms. Nature includes all living and non-living components of the Earth, such as plants, animals, microorganisms, air, water, soil, minerals, sunlight, and temperature. The environment is the surrounding condition in which organisms live and interact with one another and with non-living components. An ecosystem is a functional unit of nature in which living organisms interact with one another and with their physical environment. The living components of an ecosystem are called biotic components , while air, water, soil, light, temperature, and minerals are abiotic components . Green plants are called producers because they prepare their own food through photosynthesis. Animals that depend on plants or other animals for food are consumers , while bacteria and fungi are important decomposers that break down dead organisms and return nutrients to the env...
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