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ANSWER

Explain construction of an electric bell

Posted by Rosika Singh 6 years ago

CBSE > Class 07 > Science

2 answers

Poonam Yadav 6 years ago

When the armature and the iron is in contact with the screw the current flows through the coil which becomes in electromagnet the hammer at the end of the strip of the gong produces sound the cell is not longer an electromagnet the armature touches the screw again this process is repeated in a quick succession

Yogita Ingle 6 years ago

Electric current flows through the coil when the switch is ON, and the iron core acts as an electromagnet. The iron core attracts the hammer towards it. The hammer hits the bell and produces a sound. The circuit breaks at the screw contact when the hammer moves towards the iron core. At this point, the iron core ceases to be an electromagnet. The hammer is pulled back to its original position due to the spring action of the steel rod, and then touches the contact again to complete the circuit. The circuit is completed and current flows through the coil again, and the hammer strikes the bell again. The process repeats itself and you hear a ringing sound since the hammer keeps hitting the bell, until the switch is released.

ANSWER

What are functions of kidney

Posted by Priyanshu Dewangan 6 years ago

CBSE > Class 07 > Science

3 answers

Arikotla Roshini Vll Std Arikotla 6 years ago

Since Ammonia turns red litmus blue it is basic in nature

Naman Ahden 6 years ago

1. Kidneys remove excess fluid from the body. 2. They purify blood 3. They convert urea into urine which then goes to the urine bladder through a pair of ureters and then excreted out through the body by urethra

Yogita Ingle 6 years ago

The primary function of the kidney is to make urine and purify the blood. Each kidney removes waste materials, and other chemicals which are not required by the body.

Removal of waste products
Removal of excess fluid
Removal of excess fluid
Control of blood pressure
Red blood cells production

ANSWER

एक bayuyan 2000 मीटर की ऊँचाई पर540km/hr ke beg se chetujakar ud rha h ese shatru ke kamp se bum kitni dur girana chahiye taki yh camp se takra jaye

Posted by Vims Education 6 years ago

CBSE > Class 07 > Science

0 answers

ANSWER

Reproductive system of plant

Posted by Rajeev Kumar Pal 6 years ago

CBSE > Class 07 > Science

3 answers

Debashrita Sahoo 6 years ago

Flower

Naman Ahden 6 years ago

Flower is reproductive system of a plant

Bittu Singh 6 years ago

What is convex lene

ANSWER

Why hen lays one egg while fish lays hundreds of egg at one time

Posted by Chirag Srivastav 6 years ago

CBSE > Class 07 > Science

0 answers

ANSWER

What is a plant?

Posted by Rekhadashrath Prasad 6 years ago

CBSE > Class 07 > Science

2 answers

Priyanka Ranjan 5 years, 11 months ago

It is a small tree which is very weak and not woody

Omkar Chaturvedi 6 years ago

Plant is a living creature but it can t move like ua

ANSWER

What is the meaning of light year

Posted by Kenisha Patel 6 years ago

CBSE > Class 07 > Science

3 answers

Rohit Agrawal 6 years ago

The distance measure in the universe is called light year

Yogita Ingle 6 years ago

A light-year is a unit of distance. It is the distance a light photon travels in the vacuum in one Julian year. Denoted by ly, the value of one light-year is constant. The term light-year is often used in astrophysics to measure the distance between two astronomical objects.

Sssssssssssssss Yyyyyyyyyyyyyyy 6 years ago

Its mean a light travel in one year

ANSWER

Camel wool is used to make carpets?

Posted by Shivani Sin 6 years ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 6 years ago

The Bactrian camel gives the best-quality wool. . The Alpaca, a camel breed, gives fibres which are light weight, soft and shiny in nature.

ANSWER

What is called human body name

Posted by Avni Singh 6 years ago

CBSE > Class 07 > Science

2 answers

Rajesh Bhardwaj 6 years ago

M kyo batau

Manya Gupta 6 years ago

Human anatomy

ANSWER

What is thunderstorm

Posted by Dinesh Ladna 6 years ago

CBSE > Class 07 > Science

2 answers

Any Khan 5 years, 11 months ago

A severe storm with heavy rain , lightning and thunder is called thunderstorm .

Priyanka Ranjan 5 years, 11 months ago

The swift movement of falling rain along with rising warm air that creates a huge sound along with lightning is called thunderstorm

ANSWER

Write a important of conservation water

Posted by Ankit Thapa 6 years ago

CBSE > Class 07 > Science

1 answers

Any Khan 5 years, 11 months ago

If we conserve water then we will never face the problems of scarcity of water

ANSWER

How plants prepare their food

Posted by Bakthavachalam Ekkambaram 6 years ago

CBSE > Class 07 > Science

5 answers

Ravi Prakash 6 years ago

By roots

Anita Kumari 6 years ago

By the process of photosyntesis

Naimuddin Naimuddin 6 years ago

The process through which plants make their own food in the presence of wind water and sunlight is called photosynthesis

Pragya Ahuja 6 years ago

Green plants prepare their food by sunlight water and chlorophyll. This process is known as photosynthesis

Yogita Ingle 6 years ago

The process by which plants make their own food in the presence of sunlight, carbon-dioxide present in air, water, minerals and chlorophyll present in leaves is termed as photosynthesis.
Plants take up carbon-dioxide from the atmosphere through the tiny pores known as stomata present on thesurface of the leaves and surrounded by ‘guard cells’.
The process of photosynthesis releases oxygen in the atmosphere during the synthesis of food.
Plants absorb the water and minerals from the soil with the help of deep penetrated roots inside the soil and transport them to the leaves of the plants where synthesis of food takes place.
The green pigment present in leaves known as chlorophyll helps the leaves of plant to capture the sunlight that act as the source of energy to carry out the process.
After this the chlorophyll holding the cells of leaves in the presence of sunlight, carbon dioxide and water to produce carbohydrates in the leaves and is stored in the plants in the form of energy.

ANSWER

Describe how cristals of copper are prepared

Posted by Harsh Saini 6 years ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 6 years ago

Take a cupful of water in a beaker and add a few drops of dilute sulphuric acid.
Heat the water.
When it starts boiling, add copper sulphate powder slowly while stirring continuously.
Continue adding copper sulphate powder till no more powder can be dissolved.
Filter the solution.
Allow it to cool. Do not disturb the solution when it is cooling.
Crystals of copper sulphate will be seen at the bottom of the beaker.

ANSWER

What are two parts of flower?

Posted by Venu Gopal 6 years ago

CBSE > Class 07 > Science

5 answers

Shambhavi Kapila 5 years, 11 months ago

Stamens and pistils

Shambhavi Kapila 5 years, 11 months ago

,Stamens and pistels

Pragya Ahuja 6 years ago

Stemen Pistil

Yogita Ingle 6 years ago

The vegetative part of a flower consists of the following:

Petals: This is a bright coloured part that attracts bees, insects, and birds. Colour of petals varies from plant to plant; some are bright while some are pale coloured. Thus, petals help us to differentiate one flower from another.

Sepals: Sepal is the green coloured part beneath the petals to protect rising buds. Some flowers have fused petals-sepals while a few have separated petals-sepals.

The reproductive parts of a flower consist of the following:

Stamen: This is the male reproductive organ and is also known as Androecium. It consists of two parts namely: anther and filaments.

The anther is a yellowish, sac-like structure, involved in producing and storing the pollens.
The filament is a slender, threadlike object, which functions by supporting the anther.

Pistil: This is the innermost part and the female reproductive organ of a flower which comprises three parts -stigma, style and ovary. This is collectively known as the pistil.

Stigma: It is the topmost part or receptive tip of carpels in the gynoecium of a flower.
Style: It is the long tube-like slender stalk that connects stigma and the ovary.
Ovary: It is the ductless reproductive gland that holds a lot of ovules. It is the part of the plant where the seed formation takes place.

Rohit Agrawal 6 years ago

calyx and corrola

3Thank You

ANSWER

Points of respiration in organisms

Posted by Vaishnavi Rewaskar 6 years ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 6 years ago

The biological process in which food is utilized to produce energy is called respiration. Respiration is necessary for survival of the living beings. A living being cannot survive even for a few seconds, without respiration. During respiration, it is mainly the carbohydrate which is oxidized to produce energy. This can be shown by following equation:

Carbohydrate + Oxygen → Carbon dioxide + Water + Energy

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂ + Energy

ANSWER

When the current is switch on through a wire a campass needle kept nearby gets deflected from its north - south positions explain

Posted by Manoj Saikia 6 years ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 6 years ago

When a current is switched on through a wire, the wire starts behaving as a magnet. Hence, when a compass needle is placed near the given current carrying wire, it gets influenced by the magnetic effect of electric current and gets deflected from its north- south position.

ANSWER

Angora wool is obtained from which animal?

Posted by Shivani Sin 6 years ago

CBSE > Class 07 > Science

4 answers

Naimuddin Naimuddin 6 years ago

Angora wool is obtained from Angora goat

Indrajeet Kaushik 6 years ago

Angora goat

Rohit Agrawal 6 years ago

angora rabbit

Rohit Agrawal 6 years ago

angora rat

ANSWER

What is neutralisation reaction.

Posted by Gokul Thakral 6 years ago

CBSE > Class 07 > Science

2 answers

Priyanka Ranjan 5 years, 11 months ago

The reaction between acids and bases to form salt and water is called neutralisation reaction

Naman Ahden 6 years ago

When acids and bases are mixed , they neutralize each other's effect to form salt and water by the evolution of heat. this reaction is known as neutralization reaction For example-: brushing teeth without toothpaste, disposal of factory waste into the river, indigestion or acidity, and so on

ANSWER

What is thresing

Posted by Shravan Kr Sinha 6 years ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 6 years ago

Threshing: Threshing is used for separating seeds from the harvested stalks.

Manual Threshing: When the quantity is small, threshing is done manually. Small bundles of the harvested stalks are thrashed on a hard surface. This helps in separating the grains.
Threshing by Animals: For larger quantities, threshing is done in the traditional way; by using animals. For this, stalks are spread around a pole. Several bullocks are tied to the pole and are made to walk over the harvested stalks. Trampling by hooves of the animals helps in separating grains.
Threshing Machine: Now-a-days, threshing machines are used for the purpose. It can be powered by either a diesel engine or an electric motor. It helps in saving time and labour.

ANSWER

Name some characteristics of light

Posted by Mayank Kumar 6 years ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 6 years ago

Light is never curved and the path is always straight.
Only reflection can change the direction of light.
When light bounce by smooth surface then it is called as reflection of light.

ANSWER

What is sexual repriduction in human

Posted by Soul Hritik 6 years ago

CBSE > Class 07 > Science

1 answers

Soul Hritik 6 years ago

That is not repriduction that is reproduction

ANSWER

defination of concave lens

Posted by Sakshi Pal 6 years ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 6 years ago

Concave lens are also called divergent lens as they expand the light (bend outward) falling on it. Concave lens do not form real images. They only form virtual images which are always erect and smaller in size.

ANSWER

What Is.water table

Posted by Rajesh Singha 6 years ago

CBSE > Class 07 > Science

4 answers

Sssssssssssssss Yyyyyyyyyyyyyyy 6 years ago

The upper limit of ground water is called water table

Any Khan 6 years ago

The level of underground water at a given place is called watertable

Yogita Ingle 6 years ago

Groundwater is necessary for humans. It is stored under a different layer of the rocks. The upper place where groundwater is stored is called the water table.

The water table is found higher in plains and lower at plateaus. That is why in northern regions the hand pump is easily installed and in plateaus drilling machine is needed for tube well.

Dhananjayan R 6 years ago

The upper limit of underground is called water table

ANSWER

Data table for uniform and jon uniform motion graph

Posted by Komal Hora 6 years ago

CBSE > Class 07 > Science

1 answers

Anam Saifi 6 years ago

When an object travels equal distance in equal interval of time that is called uniform motion When an object travels unequal distance in equal interval of time that is called non uniform motion

ANSWER

Describe excretion in plant

Posted by Shivansh Pandey 6 years ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 6 years ago

The excretion mechanism in plants is completely different from animals. Different plants use different types of strategies.

Oxygen can be cinsidered as a waste product of photosynthesis and carbon dioxide a waste product of respiration; water is a waste product of both. Oxygen and carbon dioxide diffuse out through openings in the leaves (stomata) or through the cell walls of roots and other plant structures. Water will be lost through transpiration and guttation or just used for maintaining turgor in cells.

Some trees deposit waste chemicals in their branches and trunks, especially in old xylem which is probably no longer used for water transport. Materials that are exuded by some plants—resins, saps, latexes, etc.—are forced from the interior of the plant by hydrostatic pressures inside the plant and by absorptive forces of plant cells. These forces are passive in nature, and exudation requires no energy expenditure on the part of the plant.

Plant cells have large vacuoles, and these can be used for either storage of useful compounds, or the storage of waste substances - often accumulating at concentrations that lead to crystal formation in the vacuole.

Plants can also store the waste in organs that are destined to fall off (like autumn leaves) or die off (like the leaves and stalk of a bluebell which is dying back in the summer,leaving the bulb underground.

Some plants will actively secrete waste compounds into the soil, occasionally using them as chemical weapons against other competing plants.

ANSWER

How steady is your hand?

Posted by Pazhanivel Varshini 6 years ago

CBSE > Class 07 > Science

0 answers

ANSWER

Explain with the help of diagram circulatory system

Posted by Ashok Biradar 5 years, 8 months ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 5 years, 11 months ago

Working of Human blood circulatory system takes place in the steps below: (i) When the muscles of all the four chambers are relaxed, the pulmonary vein brings the oxygenated blood from the lungs in the left atrium of the heart. (ii) When the left atrium contracts, the oxygenated blood is pushed into the left ventricle through valve V1. (iii) When the left ventricle contracts, the oxygenated blood enters the main artery called aorta from which it goes to the different body organs through small branches called arterioles and capillaries. (iv) The main artery carries the blood to all the organs of the body head, arms etc except the lungs. The oxygenated blood gives off oxygen, digested food and dissolved materials to the body cells. The carbon dioxide produced in the cells enters the blood. The deoxygenated blood enters main vein called vena cava which carried it to the right atrium of the heart. (v) When the right atrium contracts, the deoxygenated blood enters right ventricle through valve V2. (vi) When the right ventricle contracts, the deoxygenated blood enters the lungs through pulmonary artery and releases carbon dioxide and absorbs fresh oxygen from air. The blood becomes oxygenated again and is sent to the left atrium of heart by pulmonary vein for circulation in the body. This whole process is repeated continuously.

ANSWER

Differences between real and virtual image of

Posted by Ashok Biradar 6 years ago

CBSE > Class 07 > Science

1 answers

Samira Aliazizi 6 years ago

Real image means that the real image form in a screen . Virtual image means the image cannot form a real image on a screen.

ANSWER

Any three differences between uniform motion and non uniform motion?

Posted by Ashok Biradar 6 years ago

CBSE > Class 07 > Science

1 answers

Meraj Alam 6 years ago

Uniform motion Non Uniform motion In Uniform motion, movement of a body is along the straight line with constant speed. In non uniform motion, movement of a body is along the straight line with variable speed. In uniform motion, body covers equal distance in equal interval of time. In this type of motion, the body does not cover the equal distance in equal interval of time. Speed of the object is similar to the actual speed. Speed of the object is different from the actual speed. The graph between distance and time (distance-time) graph shows the straight line. The graph between distance and time (distance-time) graph shows the curved line. This type of motion has zero acceleration. It has no zero acceleration.