CBSE > Class 07 > Science | CBSE Board | Homework Help

First we have to ON the switch then the battery which is lifted with wire generate magnetic effect of current then the bell act like a magnet and it attract the pendulum towards it and when in attracted the bell the attraction between the pendulum and iron bar got disturbed and the magnetic effect of current stop working when it stop working the pendulum goes back to the iron bar and when it connect with the iron bar it magnetic effects of current re generate and again hit the bell the process continue and the bell start ringing

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Ayesha Khatua 7 years, 1 month ago

Electric bell function according to electric current passes through u shaped electromagnet. It is function or iron armatore back and touches the contact screw the circle is completed and current start flowing in the coil again. The electomagnet attract the iron armature one again and the clapper strikes the gong again producing a ringing sound.

1Thank You

Shubham Kumar 7 years, 1 month ago

When the electric current pass through the electric bell the bell rings

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What is meant by current

Posted by Shrikalp Bhuyar 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Rajanya Sarkar 7 years, 1 month ago

Or A flow of electricity which results from the ordered directional movement of electrically charged particles.

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Rajanya Sarkar 7 years, 1 month ago

Belonging to the present time; happening or being used or done now

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what is the difference between myopia and hypermetropia

Posted by Soumilya Dwivedi 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

Myopia is also known as near-sightedness. A person with myopia can see nearby objects clearly butcannot see distant objects distinctly. A person with this defect has the far point nearer than infinity. However, hypermetropia is also known as far-sightedness. A person with hypermetropia can see distant objects clearly but cannot see nearby objects distinctly. The near point, for the person, is farther away from the normal near point (25 cm).

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Draw a water cycle

Posted by Sourav Yadav 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Shubham Kumar 7 years, 1 month ago

Please see the chapter 16

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Why blind people have to wear black spectacles?

Posted by Aditya Srivastava 7 years, 1 month ago

CBSE > Class 07 > Science

0 answers

ANSWER

What led to the discovery of the principle of Pendulum

Posted by Khasa Pinki 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

Galileo discovered the important principle of pendulum. The to and fro motion of a simple pendulum is an example of a periodic or an oscillatory motion. The pendulum is said to have completed one oscillation when its bob, starting from its mean position moves to extreme position and back to mean position. The pendulum also completes one oscillation when its bob moves from one extreme position to the other extreme position and comes back to first extreme position. The time taken by the pendulum to complete one oscillation is called its time period.

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ANSWER

How many bone in our hand

Posted by Ayesha Khatua 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Rajanya Sarkar 7 years, 1 month ago

27 bones

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ANSWER

How many part of our brain?

Posted by Ayesha Khatua 7 years, 1 month ago

CBSE > Class 07 > Science

4 answers

Shubham Kumar 7 years, 1 month ago

There are three types of brain

1Thank You

Ananya Ananya 7 years, 1 month ago

There are three part of our brain . They are cerebrum, cerebellum and medulla

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Ayesha Khatua 7 years, 1 month ago

What are they

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Jagveer Sikarwar 7 years, 1 month ago

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ANSWER

Write main three function of blood

Posted by A K Tech 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Aditya Avinash 7 years, 1 month ago

The three function of blood are:- 1) blood helps to protect our body with germs. 2) blood have three component RBC,WBC,PLATELET to help our body

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Ayesha Khatua 7 years, 1 month ago

It caries oxygen from the lungs to all cell of body.It transport waste particle for removal from the body. It caries digested food particle from small intestine to other part of body

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ANSWER

Write main three function of heart.

Posted by A K Tech 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Shubham Kumar 7 years, 1 month ago

It helps in the circulation of Oxygen rich blood through out the body by the pumping.It recives oxygenated blood from the lungs.

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Is sulfuric acid is strong or weak acid

Posted by Shubham Rathi 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Soumilya Dwivedi 7 years, 1 month ago

strong acid

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Mahesh Soni 7 years, 1 month ago

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Difference between a convave lens and convex lens

Posted by Lokendra Rathore 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Ritesh Bihari 7 years, 1 month ago

Concave lens are thinner at the middle and thicker at thr edge. Convex lens are thicker at the middle and thicker at the edge. The image formed by a concave leans are large and enlarge in size The image fotmed by a convex lens are small and upside down

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Lokendra Rathore 7 years, 1 month ago

Convex - when an object is close to convex lens it form virtual,errectand magnified image 2-when an object is far away from convex lens we get real inverted and diminish image . 3-it is also called conversing lens because it converse parallel beem of light at a point Concave lens 1 concave lens always gorm virtual ,errect and dimnish image 2- it is also called diversing lens because it diverse parallel beem of light.

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People obtain ground water through ____________ and __________ •

Posted by Anirudh Bhatt 7 years, 1 month ago

CBSE > Class 07 > Science

5 answers

Kumaran Sopanam 7 years, 1 month ago

Tube wells and hand pumps

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Nithish Rahul 7 years, 1 month ago

Well and handpump

1Thank You

Sh ~?Shrawni 7 years, 1 month ago

Rain, hand pump

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Ayush Choudhary 7 years, 1 month ago

Rain

1Thank You

Niyati Niyati 7 years, 1 month ago

Well, handpumps

3Thank You

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What is radiation , convection , sea breez, land breez short defenation

Posted by Siddhi Patidar 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Niyati Niyati 7 years, 1 month ago

Radiation - transfer of heat without material medium and heat is directly transferred from hot to cold end .. Convection - transfer of heat in which molecules themselves move and carry heat to other parts of water.. Sea breeze - during the day, the air over land is warmer than sea . Hence land air rises up and sea breeze blows.. Land breeze- at night , the air over the sea is warmer than land. Hence sea air rises up & land breeze blows

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What is nagative work

Posted by Aman Kumar 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

The work done by a force can be either positive or negative.

Work done is negative when the force acts opposite to the direction of displacement.
Work done is positive when the force is in the direction of displacement.
Work done is zero when a force acts at right angles to the direction of motion of the body.

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ANSWER

During breathing _____________ and ______________ take place alternately

Posted by Tanvi Gupta 7 years, 1 month ago

CBSE > Class 07 > Science

4 answers

Kumaran Sopanam 7 years, 1 month ago

Inhalation and exhalation

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Sh ~?Shrawni 7 years, 1 month ago

Inhale and exhale Inhale = taking oxygen Exhale = exheal co2

1Thank You

Anirudh Bhatt 7 years, 1 month ago

Inhalation and exhalion

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Damini Goud 7 years, 1 month ago

Inhalation and exhalation

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ANSWER

What are genetically engineered vegetables/fruits? Is it safe to eat them? Justify

Posted by Rupinder Kaur 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

Genetically modified foods (GM foods), also known as genetically engineered foods (GE foods), or bioengineered foods are foods produced from organisms that have had changes introduced into their DNA using the methods of genetic engineering. Soy, wheat, rice, corn and papaya are genetically modified crops.

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How many type of motion?

Posted by Eshani Maurya 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Sh ~?Shrawni 7 years, 1 month ago

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Poonam Dwivedi 7 years, 1 month ago

Movement of any object with time is called motion. Its 6 types 1.circular motion 2.periodic motion 3.oscillatory motion 4.straight line motion (linear motion) 5.rotational motion

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What is percolation rate of soil and water

Posted by Bhabani Padhy 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Dhyey Desai 7 years, 1 month ago

The amount of water seeped into soil in a minute

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ANSWER

Explain how the sun affect weather and climate?

Posted by Bhabani Padhy 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Adarsh Dwivedi 7 years, 1 month ago

At the time when the sun is not present •Evaporation process is also not possible When it is not possible cloud will not form as it is possible from Precipitation and evaporation process will not complete HENCE, sun affect weather and climate

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What is drip irrigation

Posted by @Purbita# ******* 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Nabajit Paul 7 years, 1 month ago

Drip irrigation is the technique of watering plants by making use of narrow tubeings which delivers water directly at the base of the plant

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ANSWER

What is the difference between lateral inversion and Inversion

Posted by Khasa Pinki 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Gaurav Seth 7 years, 1 month ago

Laterally inverted means the left and right sides of the image are interchanged. Real, inverted means the image is upside down.

A mirror forms a laterally inverted image, which cannot be caught on a screen because it is virtual. A virtula image is always erect. Real images are always inverted.

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Explain how groundwater is recharged

Posted by Nikhil Gupta Nikhilgupta 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Khasa Pinki 7 years, 1 month ago

Ground water is recharged by the process of infiltration when the surface water seeps down the Earth surface ?

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What is a heart

Posted by Bhawana Jani 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Bhabani Padhy 7 years, 1 month ago

The heart is a organ which works like pump for the blood transport. The heart is located in the chest cavity to slide lift and down word. To separate the blood rich in oxygen and blood rich in carbon dioxide. The heart have for chambers upper chambers are called atrium and lower two chapters are called ventricle. The chamber are help to avoid mixing up to the blood.

1Thank You

Bhawana Jani 7 years, 1 month ago

The organ inside the chest that send blood round your body.

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What is animal

Posted by Nabajit Paul 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Honey Neeha 7 years, 1 month ago

A animal is a living organism from which humans came

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Explain the stages of blood flow between body, heart and lungs

Posted by Sania Khanna 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 6 years, 1 month 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.

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What is oscillator motion?

Posted by Bhabani Padhy 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Yogita Ingle 7 years, 1 month ago

An oscillatory motion is a motion where a body moves between two extreme positions.
The center of these extreme positions is called mean position.
Time taken to complete one oscillation is called Time Period.
When an oscillatory motion repeats itself in equal intervals of time it is called Periodic Motion.

3Thank You

Niyati Niyati 7 years, 1 month ago

To and fro motion

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ANSWER