A circle (black) which is measured by its circumference (C), diameter (D) , and radius (R) in red; its centre .....

Let the breadth of the garden be 'b'. From condition,  Length(l) = (b + 6) m. Also given, Perimeter = 88 m But P = 2(l + b) or, 88 = 2( b + 6 + b) or, 44 = 2b + 6 or, 38 = 2b Therefore, b = 19 m. And, length (l) = b + 6 = 25 .....

Here, Let the age of brother be 'x'. From given condition, sister is 3 years younger than brother. So, Age of sister = Age of brother - 3  = (x - 3) Also,  Given that, sum of age of brother + sister = 27 or, x + (x - 3) = .....

Let the age of daughter be 'x'. From the given condition,  Age of mother = (x + 30) Now, After 6 years: Age of Mother = (x + 30) + 6 = (x + 36) Also,  Age of daughter = (x + 6). From condition, Age of mother after 6 years = .....

Here, Smallest number that can be divided by 7 and greater than 100 is  105,  Next numbers are 105 + 7 = 112, 112 + 7 = 119, 126, 133, 140, 147, 154, 161, 168, 175, 182, 189, 196.   but, sum of digits will be only of, 119 and .....

Here given that, If b be the breadth then,   l = 3 b --------------(i) And Perimeter of a rectangular field = 32 m or, 2(length + breadth) = 32 m or, 2(3b + b) = 32 m or, 2(4b) = 32 m or, 8b = 32 m or, b = (32/8)m or, b = 4 .....

The magnetic compass is the most well-known of all instruments used in finding direction. It is the oldest navigational instrument and has been aiding sailors to cross the seas for many centuries. Mariners can use magnetic compasses to fix a .....

So, electromagnet is a soft metal core made into a magnet by the passage of electric current through a coil surrounding .....

You may kow that Mechanical Advantage (MA) is a measure of how much easier does the machine make the work. In the case of block and tackle arrangement, the number of pulley is more than one. With the increase in the number of pulleys, number of .....

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Have you heard a ringing bell? How does it produce the sound? It is due to the vibration of molecules and due to hitting of the gong on the bell i.e due to force. In its simplest form, vibration can be considered to be the oscillation or .....

Sources of sound are, 1.Electronic Instruments 2.Acoustic Instruments 3. Living .....

You know that there are many different kinds of sounds. The kinds of sounds we hear, depend upon the objects producing it. For example: Fire alarms are loud, whispers are soft, each of the person has a different voice. The differences between .....

A pinhole camera is the simplest camera possible. It consists of a light-proof box, some sort of film and a pinhole. The pinhole is simply an extremely small hole like you would make with the tip of a pin in a piece of .....

Take a book infront of a candle or light. What happens? A shadow is formed. Take a transparent glass and keep it infront of a light source. What happens? Do you see any shadow? No, you don't. You know that, a shadow is formed when the .....

The win-win policy is an approach to conflict management. This approach requires the use of interpersonal communication to get both conflicting sides onto the common consensus. The conflicting sides come to the common agreement and solve the .....

1.Natural sources of light are those which emit light naturally. While artificial sources of light are those which donot emit their own light and they are made by hujman. 2. Some of  the natural sources of light are the sun, moon, stars and .....

You might have used a sun glass. It allows light to pass through it easily. So, it is transparent. While objects which donot allow light to pass through it are opaque. We can easily see through trasnparent object while we cannot see through .....

1. Luminious object are those object which emit their own light  while non - luminious object are those object which do not emit their own light. 2. Example of luminious object are  Sun, lighted candle, glowing bulb etc. Example of .....

1.An image is what you see in a mirror.   A shadow is what you see as a rough outline of yourself on the ground, when in the sun.   2.An image is formed by reflection or refraction of light.  A shadow if formed by blocking light. 3. .....

During the hot summer days, when you drive, the temperature of tyres increases faster, consequently, the heated air inside the tyres expands and its pressure rises quickly, which can lead to tyre blowout with disastrous consequences. A tyre .....

You might have known about the colours and their different character. In the summer season, the surrounding temperature is very hot and dry. Mostly the days are so bright. So, people wants to protect their body from bright sunshine. For this they .....

The heat obtained from the sun can directly be used in different purposes to generate heat. Like: It is used in solar panels to heat water in winter. Therefore, the sun is considered as the major source of heat .....

A biofuel is a gas, liquid, or solid from natural sources such as plants that is used as a fuel. Examples are, wood, coal, petrol .....

Festivals are cultural occasions. They are based on religions. There are numbers of positive aspects of celebrating festivals. The three positive aspects are written below: - The celebration of festivals develops the sense of solidarity among the .....

Here, height of the room is already given. 6m. So can you please check the .....

    First class lever Second class lever Third class lever .....

A pulley is a mechanical device that can be used to lift heavily objects more easily. Pulleys consist of a wheel that rotates on an axle—which is a rod through the center of the wheel—and a rope, cable, or chain. There are three main .....

In wheel and axle, load is attached at axle. You can see the following .....