CBSE > Class 08 > Science | CBSE Board | Homework Help

In conductors, there are valence electrons which are free to move and can pass electricity but in insulators there is the absence of valence electrons which move inside the matter and cause the flow of electricity

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Mahek Bansal 3 years, 8 months ago

In a conductor, electric current can flow freely, in an insulator it cannot. Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them. ... Most atoms hold on to their electrons tightly and are insulators

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ANSWER

Define vector

Posted by Pranay Yadav 3 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Mahek Bansal 3 years, 8 months ago

Vectors are used in science to describe anything that has both a direction and a magnitude. ... The ball's velocity vector describes its movement—the direction of the vector arrow marks the ball's direction of motion, and the length of the vector represents the speed of the ball.

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ANSWER

Which part of the sky can you find the Venus if it is visible at evening star

Posted by Aadhhaya Rastogi 3 years, 8 months ago

CBSE > Class 08 > Science

3 answers

Jyoti Sharma 3 years, 8 months ago

If Venus is visible as a evening star i.e. after sunset, it appears in the western sky.

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Himanshi Rawat 3 years, 8 months ago

Venus appears in the western sky aftersunset that is why it is called as evening star.

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Pranay Yadav 3 years, 8 months ago

Different from different locations

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ANSWER

What is called the converions

Posted by Ayush Raval 3 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Ayush Raval 3 years, 8 months ago

Don

3Thank You

ANSWER

A gropup of similar cells performing a specific function is called

Posted by Rohit Patil 3 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Divyanshi Jain 3 years, 8 months ago

A group of similar cells performing a specific function is called tissue. A stage between cell and an organ.

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Khushi Deka 3 years, 8 months ago

Known as tissues, It is a cellular organizational level between cells and a complete organ.

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ANSWER

What is testube baby

Posted by Deshmukh Sayid Rashidmiya Deshmukh Sayid 3 years, 8 months ago

CBSE > Class 08 > Science

3 answers

Suresh Gor 3 years, 8 months ago

These

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Himanshi Rawat 3 years, 8 months ago

I am replying to you PRANAY YADAV. You should not send these types of messages in this app as we all know that this is an educational app . Students come here for clearing their doubts and learning in a new way that is question and answer form. But you are doing these type of things here which is not right. So as to warn you I am sending this message. Thank you ??

1Thank You

Lavanya Chauhan 3 years, 8 months ago

In some women's oviducts are blocked . These women's are enable to bear babies because sperm cannot reach the egg for fertilisation . In such cases doctors collect freshly released egg and sperm and keep them together for few hours for IVF or in vitro fertilization . In case fertilisation occurs the zygote is allowed to develop for about a week and then it is placed in the mothers uterus. Complete development takes place and the baby is born like any other normal baby . Babies born through this technique are called test tube babies.

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ANSWER

Did your exams start❓

Posted by V. Ridhanya Catherine 3 years, 8 months ago

CBSE > Class 08 > Science

5 answers

Pranay Yadav 3 years, 8 months ago

Yes

1Thank You

Aadhhaya Rastogi 3 years, 8 months ago

Yes

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Lavanya Chauhan 3 years, 8 months ago

Yes

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Deshmukh Sayid Rashidmiya Deshmukh Sayid 3 years, 8 months ago

Yes

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Isha Amin 3 years, 8 months ago

Yes

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ANSWER

Jay

Posted by Rohit Kumar 3 years, 8 months ago

CBSE > Class 08 > Science

3 answers

Mahek Bansal 3 years, 8 months ago

A seed drill is an implement used in sowing.

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Pragya Sharma 3 years, 8 months ago

Name the implement used in sowing

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Sudhu Sab 3 years, 8 months ago

hallo

1Thank You

ANSWER

Diffence between human's carbon dioxide and coal's carbon dioxide.

Posted by Suhani ❤ 3 years, 8 months ago

CBSE > Class 08 > Science

4 answers

Tannie Tan⁷ 3 years, 8 months ago

An atom is the tiniest possible particle of any element, like carbon or oxygen. A carbon atom combines easily with two oxygen atoms to make the compound carbon dioxide. "C" stands for carbon, "O" stands for oxygen, so carbon dioxide is often called "C-O-2, and written "CO2." CO2 is a gas. It is invisible.

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Karan Kohli 3 years, 8 months ago

2Thank You

Karan Kohli 3 years, 8 months ago

1Thank You

Whistle Y Gamer 3 years, 8 months ago

His send uid

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ANSWER

You will provide the mixture of petroleum and water. How will you separate

Posted by Gotam Patel 3 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Jyoti Sharma 3 years, 8 months ago

Petroleum is lighter than water. We can separate these two by the method of decantation. Light petroleum can be poured carefully as it remains at the top of the water.

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Ar᭄Adιтya A 3 years, 8 months ago

I will separate it with using physical properties of petroleum and water, Since petroleum has less density than water so it is lighter than water and in mixture it will float on water. Thus we can easily separate.

1Thank You

ANSWER

Tou are provided with a mixture of petroleum and water. How will you separate ?

Posted by Gotam Patel 3 years, 8 months ago

CBSE > Class 08 > Science

0 answers

ANSWER

What is lightning conductor

Posted by Akshat Rajput 3 years, 8 months ago

CBSE > Class 08 > Science

3 answers

Tannie Tan⁷ 3 years, 8 months ago

Lightning conductor is a device used to protect a building from the effects of lightning. A lightning conductor is made of a thick strip of metal (usually of copper). The top end of lightning conductor is pointed like a sharp spike (or spikes) and it is fixed above the highest point of the building

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Shikha Yadav 3 years, 8 months ago

A lightning conductor is a metal rod placed on a building and connected with the ground below to protect the building from being damaged by lightning. Its purpose is to offer a low resistance path to lightening and allow it to pass to the ground without impacting the building.

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Vipan Kaur 3 years, 8 months ago

Lighting conductor is used in buildings to prevent building from lightning

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ANSWER

List changes in the body that take place a puberty.

Posted by Akshat Rajput 3 years, 8 months ago

CBSE > Class 08 > Science

4 answers

Jyoti Sharma 3 years, 8 months ago

Hair develops under the armpit, under chest and in the public regions. Voice becomes deeper.Muscles develop, and shoulders become broad. Increase in weight..... Hope it helps

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Pradnya Kumbhar 3 years, 8 months ago

1. Increase in height 2. Change in body shape

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Mahek Bansal 3 years, 8 months ago

The changes in the body of puberty are: (i) Sudden increase in height. (ii) The bones of arms and legs elongate and make a person tall. (iii) Growing of hair at different parts of body. (iv) The voice of a boy gets hoarsed. (v) Development of *** organs. (vi)Growth of moustaches and beards in the boys. (vii) The breast in girls develops and hips become wider whereas in boys shoulders generally broaden.

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Plaksha Chaudhary 3 years, 8 months ago

Following changes take place in the body during puberty: 1)Increase in Height. 2)Change in Body Shape. 3)Voice Change. 4)Increased Activity of Sweat and Sebaceous Glands. 5)Development of *** Organs. 6)Reaching Mental, Intellectual and Emotional Maturity......

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ANSWER

Defins adilescence

Posted by Akshat Rajput 3 years, 8 months ago

CBSE > Class 08 > Science

3 answers

Pradnya Kumbhar 3 years, 8 months ago

The period of time when the body undergoes changes leading to reproductive maturity is called adolescence

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Khushi Deka 3 years, 8 months ago

Adolescence* improve your spelling. Well it's define* not defins.. btw the ans is given by Vipan Kaur.

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Vipan Kaur 3 years, 8 months ago

THE PERIOD OF LIFE WHEN THE BODY UNDERGOES CHANGES is called adolescence.

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ANSWER

Which label shows angle of reflection

Posted by Kunal Adiwal 3 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Shikha Yadav 3 years, 8 months ago

AO is the incident ray OB is the reflected ray ON is the normal ∠AON is the angle of incidence ∠NOB is the angle of reflection.

2Thank You

ANSWER

Where did the earthquake accured in India in 2001?

Posted by Mahima Chahal 3 years, 8 months ago

CBSE > Class 08 > Science

5 answers

Tannie Tan⁷ 3 years, 8 months ago

26, 2001, in the Indian state of Gujarat, on the Pakistani border. The earthquake struck near the town of Bhuj on the morning of India's annual Republic Day (celebrating the creation of the Republic of India in 1950), and it was felt throughout much of northwestern India and parts of Pakistan.

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Vipan Kaur 3 years, 8 months ago

Gujarat

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Karthick Muralikannan 3 years, 8 months ago

2Thank You

Kunal Adiwal 3 years, 8 months ago

Which label shows angle of reflection

1Thank You

Tanu Singh 3 years, 8 months ago

Tru

3Thank You

ANSWER

Which is the youngest of coal

Posted by Shreya Yadav .V 3 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Shikha Yadav 3 years, 8 months ago

Lignite Lignite - Sometimes called "brown coal," lignite is the youngest of the coal types, and has the lowest energy content, containing between 25 and 35 percent carbon.

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Yukti Tandi 3 years, 8 months ago

Lignite

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ANSWER

Voice box is also called________.

Posted by Neeraj Singh 3 years, 8 months ago

CBSE > Class 08 > Science

5 answers

Mahima Chahal 3 years, 8 months ago

Lyrnx

2Thank You

Jaideep Hanumant Bhosale Bhosale 3 years, 8 months ago

Larynx

2Thank You

Ishika Pal 3 years, 8 months ago

Lyrax

2Thank You

Sakshi Mishra 3 years, 8 months ago

Larynx

2Thank You

Manthan Kabra 3 years, 8 months ago

Larynx

2Thank You

ANSWER

Explain an activity which shows metals are good conductors of electricity

Posted by Nikhil Garg 3 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Mahek Bansal 3 years, 8 months ago

Take a glass rod, a silver spoon and a plastic scale. Dip all three in a beaker containing boiling water. Leave the setup for 2-3 mins and touch each of the three, the glass rod, the silver spoon and the plastic scale. ... Thus, it is proved that metals(in this case silver) are good conductors of heat.....

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Ramu Nishad 3 years, 8 months ago

Yes metal are are good conductor of electricity

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ANSWER

A girl weighing 50 kg is standing on pencil heels , each having an area of cross section of 1cm². An elephant weighing 2000 kg and foot area of cross section is 250 cm². Standing on floor. Which of the two exerts more pressure on the floor

Posted by Mahek Bansal 3 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Mahek Bansal 3 years, 8 months ago

Thank you

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Tannie Tan⁷ 3 years, 8 months ago

You will get the answer in this link ? https://www.topperlearning.com/answer/a-girl-of-mass-50-kg-is-standing-on-pencil-heels-each-of-area-of-cross-section-1-cm2-and-an-elephant-of-mass-5000-kg-and-foot-area-250-cm2-each-standi/40tli5zoo

2Thank You

ANSWER

It is a simple device which helps us to see multiple images name the device

Posted by Nitish Raj 3 years, 8 months ago

CBSE > Class 08 > Science

5 answers

Ramu Nishad 3 years, 8 months ago

Kaleidoscopr

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Yukti Tandi 3 years, 8 months ago

Kaleidoscope

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Mahima Chahal 3 years, 8 months ago

Kaleidoscope

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Sakshi Mishra 3 years, 8 months ago

Kaleidoscope

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Mahek Bansal 3 years, 8 months ago

Kaleidoscope

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ANSWER

What is velocity?

Posted by Parth Gupta 3 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Mahek Bansal 3 years, 8 months ago

The meaning of velocity of an object can be defined as the rate of change of the object's position with respect to a frame of reference and time. ... If there is a change in magnitude or the direction in the velocity of a body the body is said to be accelerating.

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ANSWER

Why is the petroleum called black gold

Posted by Sunil Chakma 3 years, 8 months ago

CBSE > Class 08 > Science

3 answers

Mahek Bansal 3 years, 8 months ago

Petroleum is referred to as Black Gold. ... When the petroleum is drilled from the ground in the liquid form, it is referred to as crude oil. This name black gold itself is an indication that it is very vital to humans. Because of its oil and worth, people refer to it gold.

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Harshita Birt 3 years, 8 months ago

becauce it is in black colour and find from earth crust

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Komal Preet Kaur ? 3 years, 8 months ago

4/12

1Thank You

ANSWER

Define pressure write the relation between pressure force and area name the instrument used to measure atmosphere in pressure

Posted by Yokesh Saravanan 3 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Tannie Tan⁷ 3 years, 8 months ago

A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure. ... Barometers measure this pressure. Atmospheric pressure is an indicator of weather.

1Thank You

ANSWER

Define cornea of human eye explain how you can take care of your eyes

Posted by Shifa Ghoghari 3 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Tannie Tan⁷ 3 years, 8 months ago

The cornea (say: KOR-nee-uh), a transparent dome, sits in front of the colored part of the eye. The cornea helps the eye focus as light makes its way through. It is a very important part of the eye, but you can hardly see it because it's made of clear tissue.

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ANSWER

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