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Gaurav Seth 6 years, 1 month ago
An electric fuse is a safety device used to limit the current in an electric circuit. The use of a fuse is to safeguard the electric circuit and the electric appliances connected in the electric circuit from being damaged.
A fuse is a short piece of wire made up of a material of high resistivity and of low melting point, So that it may easily melt due to overheating due to the excessive flow of electric current.
The thickness of the fuse wire is different in different fuses depending on the amount of current which is permitted to flow through them. Generally an alloy of tin and lead is used as the material of the fuse wire as it has high resistivity and low melting point.
Usually the fuse wire is a thin wire to be the resistance of the fuse wire is much more than that of the live wire.
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Yogita Ingle 6 years ago
Components of the torch are :
Bulb , cells , connecting wires and metal or plastic case.
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Gaurav Seth 6 years, 1 month ago
Q : Name two flowers each with joined and separated sepals .
Flowers with joined sepals are Periwinkle (Sadabahar) and Hibiscus (China rose). Flowers with separated sepals are Rose and Magnolia .
Posted by Hum My Mum 6 years, 1 month ago
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Gaurav Seth 6 years, 1 month ago
Q : Name two flowers each with joined and separated sepals .
Flowers with joined sepals are Periwinkle (Sadabahar) and Hibiscus (China rose). Flowers with separated sepals are Rose and Magnolia .
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Gaurav Seth 6 years, 1 month ago
There are four types of movable joints in the body; which are as follows:
- Ball and socket joint: In this joint the rounded end of one bone fits into the cavity (hollow space) of another bone. It permits movement in all directions. The joints between shoulder and the upper arm is an example of ball and socket joint. Similarly, the joint between thigh and hip is an example of ball and socket joint.
- Pivot Joint: This type of joint allows movements in many planes, viz. up and down, side to side movements. The joint between the skull and the vertebral column is an example of pivot joint.
- Hinge joint: This joint is similar to the hinges in a door. This joint allows movement only in one plane and only up to 1800. The knee joint and elbow joint are examples of hinge joint.
- Gliding joints: The movement in this joint happens due to sliding of bones over one another. Joints between the rings of the backbone are examples of gliding joint. The wrist joint is also an example of gliding joint.
Gaurav Seth 6 years, 1 month ago
Types of Joints
- Fixed joints: The joints where no movement of bones is possible are called fixed joint. The joints in the skull bone (cranium) are examples of fixed or immovable joints.
- Moveable joint: Movement is possible in these joints. There are two types of movable joints:
- Freely movable joints and
- Partially movable joints.
Posted by Drrashmi Dwivedi 6 years, 1 month ago
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Gaurav Seth 6 years, 1 month ago
Magnet: An object which attracts magnetic materials; like iron, cobalt and nickel; is called magnet.
Types of Magnet
Magnets are made in different shapes and they are named according to the shape, e.g. bar magnet, dumb-bell shaped magnet, horse-shoe magnet, cylindrical magnet, etc.
Posted by Sujal Namdev 6 years, 1 month ago
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Yogita Ingle 6 years ago
Insufficient water content in the human body results in severe dehydration, which is often accompanied by kidney failure, seizures, and swelling in the brain.
Water helps improve the circulation of oxygen throughout the body.
It also plays a crucial role in the digestion of food.
Water is a very important component of saliva, which helps break down food.
The excretion of waste in the human body requires water. Insufficient water levels in the body may increase the strain on the kidneys, resulting in the formation of kidney stones.
Posted by Sunita Khade 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
A fiber is converted to yarn and yarn is converted to fabric. So in order, they serve as raw-material to other in subsequent stage.
A fiber is basically filament (something that you can practically see at home - take cotton in hand and each hair-type thing that makes cotton bunch is Filament - explained in most laymen terms)
A yarn is thread made out of fiber after due processes of combing and stretching and so on (bit technical but easy to understand)
Once the thread is made (which is yarn), it is used to make fabric - process called as weaving. And obviously fabric is used to make garments.
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Yogita Ingle 6 years ago
Snail
- A snail carries a hard outer covering called as a shell, it is made of calcium carbonate.
- The shell is dragged by the snail, and it does not help in their locomotion.
- Shell has an opening through which the body and head project out. The body is made up of muscles and is the foot of the snail. Shells protect snails from their predators.
- They move in a wavy motion
- They propel by riding on a layer of mucus, through muscle contractions of the foot
- It secretes mucus which enables swift movement.
Birds
- Birds can walk and fly
- Some birds can swim too. Example: Swans, Ducks
- Birds are able to fly as their bones are hollow and light and are called pneumatic bones.
- Bones of forelimbs enable in flying as they are modified into wings
- Bones in hind limbs help in perching and walking
- They possess strong shoulder bones
- Pectorals or breast muscles are large powerful muscles that help the birds to fly
Fish
- The body of fish resembles the shape of a boat
- The body tapers down at both ends, head and tail are comparatively smaller than the mid part of the body, hence we say their body is streamlined
- This shape allows water to glide over them thus enabling swift and efficient movement
- Fishes have a skeleton which is covered with muscles
- As fish swim, muscles at the upper part of the body glide to the other side and lower part oscillates in the opposite direction and then quickly reverses this movement hence forming a curvy motion in the water. It results in a push and jerk making it move ahead which is aided by fins of the tail.
- Other fins provide balance and maintain direction while a fish swims.
Posted by Ayush Rout 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
Light is a form of energy which helps us in seeing objects. When light falls on an object, some of the light gets reflected. The reflected light comes to our eyes and we are able to see an object.
Luminous Object: An object which produces light is called a luminous object, e.g. sun, bulb, etc.
Non-luminous object: An object which does not produce light is called non-luminous object, e.g. moon.
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Siddharth Kulkarni 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
- We might be using computers in our day to day lives but never wondered the presence of a magnet inside it. Magnetic elements present on a hard disk helps to represent computer data which is later ‘read’ by the computer to extract information.
- Magnets are used inside TVs, Sound speakers and radios. The small coil of wire and a magnet inside a speaker transforms the electronic signal to sound vibrations.
- Magnets are used inside a generator to transform mechanical energy to electrical energy where there are other kinds of motors which use magnets to change electrical energy to mechanical energy.
- Electrically charged magnets can help cranes to move large metal pieces.
- Magnets are used in filtering machines which separates metallic ores from crushed rocks.
- It is also used in food processing industries for separating small metallic pieces from grains etc.
- Magnets are used in MRI machines which are used to create an image of the bone structure, organs, and tissues. Even magnets are used to cure cancer.
- At home, you use magnets when you stick a paper on the refrigerator in order to remember something. Attaching a magnetic bottle opener to the fridge can come in handy.
- We often use pocket a compass to find out directions when we are on a trek. The pocket compass uses a magnetic needle to point north.
- The dark strip on the back of debit and credit cards is of magnetic nature and are used to store data just like computers’ hard drives.
- Magnets can help collect all the nails which are scattered on the ground after a repair job.
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Pankhuri Sinha 6 years, 1 month ago
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Aman Gupta 6 years, 1 month ago
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