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

It is because of the difference in the speed of sound in air and speed of light in air , the lightining produced in the sky is seen at once , whereas the sound of the thunder is heard a few second later . The light travels at a speed of 300,000km/s and reaches at once , whereas sound travels at a speed of 330 m/s and takes sometime to reach the observer.

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Pratibha Meena 8 years, 4 months ago

The speed of light is more than the sound ,So the lightning is seen earlier than thunder the speed of sound is less than lightning ,So we can hear thunder later than seen light ☺️☺️

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Function of the nucleus

Posted by Ritesh Rakshe 8 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Rishu Yadav 8 years, 3 months ago

Control and coordinate the cell also called as brain of cell

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Define refining of petroleum

Posted by Mayank Mehta 8 years, 4 months ago

CBSE > Class 08 > Science

0 answers

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Biodervisity

Posted by Tamanna Ahlawat 8 years, 4 months ago

CBSE > Class 08 > Science

0 answers

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During the time of fertilization, only one egg and one sperm (out of millions of sperms) fuse together to form a zygote. What happens to the remaining sperms that went into the body of the female

Posted by Ipsita Shukla 8 years, 4 months ago

CBSE > Class 08 > Science

1 answers

S Balaji 8 years, 4 months ago

After 1 month bleeding from female body also not fertilised sperm also released.

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What is who system

Posted by Abhi Sharma 8 years, 4 months ago

CBSE > Class 08 > Science

0 answers

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How thrander comes

Posted by Darsit K 8 years, 4 months ago

CBSE > Class 08 > Science

0 answers

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Why the male transfer the supm cell in women cell

Posted by Krutik Patel 8 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Aastha Sinha 8 years, 4 months ago

Obviously for reproduction !!?????

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Define incubation

Posted by Sanidhya Sisodiya 8 years, 4 months ago

CBSE > Class 08 > Science

0 answers

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What is refracted ray ?Please answer fast ....tomorrow is my oral test?????

Posted by Janhvi Dwivedi 8 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Mahi Pujari 8 years, 4 months ago

A refracted ray is transmitted into the second medium and travels in a different direction than the incident ray. The angle that the incident, reflected, and refracted rays make with the surface normal are called the angles of incidence, , reflection, , and refraction, , respectively.

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What is puberty?

Posted by Rahul Anand 8 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Adeeba Haider 8 years, 4 months ago

Thwe period of life when the body undergoes changes leading to reproductive maturity is called puberty

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What is the difference between noise and music ? Can music become noise some times

Posted by Jatin Rao 8 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Adeeba Haider 8 years, 4 months ago

The sound in the environment which are pleasant to our ears is known as music and the same which is unpleasant to our ears is called noise. Yes sometimes the sound which is music to someone can be noise to the others

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Gopinath Messi 8 years, 4 months ago

If sound goes above 120 Hz is called noise whereas below 120 Hz is called music .yes when it's volume above 120 Hz means music can converted as noise

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Name the property which decides whether a given sound is audible or inaudible

Posted by Babita Singh 8 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Preeti Dabral 8 years, 2 months ago

The property which decides whether a given sound is audible or inaudible is frequency.

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Jatin Rao 8 years, 4 months ago

I think frequency

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Which device is used for the electrolysis of water

Posted by Ramaz Goyal 8 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Nishant Kumar 8 years, 4 months ago

We need two pencils as electrodes and a glass, some water a battery and two pieces of wires.

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Does pure water conduct electricity ?if not,what can we do to make it conducting ?

Posted by Dev Diwakar 8 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Ramaz Goyal 8 years, 4 months ago

Pure water does not conduct electricity If we mix salt in it then it will start conducting electricity

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It is safe for the electrician to carry out electrical repairs outdoors during heavy downpour ?explain.

Posted by Dev Diwakar 8 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Ramaz Goyal 8 years, 4 months ago

Downpour contains many salty substances which when fall on electrical repairs gives electrical shock to the person

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Defination of adam's apple

Posted by Payal K 8 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Yash Singh 8 years, 4 months ago

In human male the larynx grows during puberty any can be seen as protruding part of the throat. That is known as Adam's apple.

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What is frication

Posted by Ravi Meena 8 years, 4 months ago

CBSE > Class 08 > Science

3 answers

Yashleen Kaur 8 years, 4 months ago

frication is a force which acces

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Adeeba Haider 8 years, 4 months ago

The force opposing the direction of motion of any object moving on the earth surface

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Nishant Kumar 8 years, 4 months ago

When we move anything It stops on of ng a certain distance it is due to friction only. In rough surfaces the interlocking becomes more therefore there the friction is more.

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Forces

Posted by Utsav Kumar 8 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Nishant Kumar 8 years, 4 months ago

A pull or push of an object is known as force.

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How the menstruation cycle is prevented

Posted by Mayank Tirankar 8 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Bose Einstein 8 years, 4 months ago

It can't be prevented.Every filmen has menstruation.After the age of 45 to 50 mensuration stops Which is called menopause.

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Name one wild life sanctury and one national park which r contained in pachmarhi biosphere reserve

Posted by Varsha Shetty 8 years, 4 months ago

CBSE > Class 08 > Science

0 answers

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Which plastic used in pressure cooker handle

Posted by Varun Kumar 8 years, 4 months ago

CBSE > Class 08 > Science

3 answers

Jayanth Gonwar 8 years, 4 months ago

Thermosetting plastic

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Aastha Sinha 8 years, 4 months ago

Teflon...

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Akanksha Sinha 8 years, 4 months ago

Tefflon

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What are the changes observed after the electrolysis of copper sulphate using copper electrodes

Posted by Rishi Agarwal 8 years, 4 months ago

CBSE > Class 08 > Science

0 answers

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What is electrons

Posted by Nishtha Jain 8 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Nishant Kumar 8 years, 4 months ago

The negative charge flowing in any thing is called electron

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Yash Singh 8 years, 4 months ago

An electron are the negative charge particles in an atom..

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Who was Newton

Posted by Jennie Barman 8 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Amar Kumar 8 years, 4 months ago

Sir Isaac Newton is a scientist,best known for his work on gravity. He also worked on and discovered many other scientific wonders during his lifetime (1642-1727). His work in physics was so advanced that he was the first scientist to be knighted, which is a great honor in England and the reason "Sir" precedes his name.

Newton also made pathbreaking contributions to optics, and he shares credit with Gottfried Wilhelm Leibniz for developing the infinitesimal calculus. Newton's Principal formulated the laws of motion and universal gravitation that dominated scientists' view of the physical universe for the next three centuries.

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What is primary sexual reproduction

Posted by Sonu Bharti 8 years, 4 months ago

CBSE > Class 08 > Science