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.

1Thank You

Pratibha Meena 8 years, 1 month 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 ☺️☺️

1Thank You

ANSWER

Function of the nucleus

Posted by Ritesh Rakshe 8 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Rishu Yadav 8 years, 1 month ago

Control and coordinate the cell also called as brain of cell

0Thank You

ANSWER

Define refining of petroleum

Posted by Mayank Mehta 8 years, 1 month ago

CBSE > Class 08 > Science

0 answers

ANSWER

Biodervisity

Posted by Tamanna Ahlawat 8 years, 1 month ago

CBSE > Class 08 > Science

0 answers

ANSWER

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, 1 month ago

CBSE > Class 08 > Science

1 answers

S Balaji 8 years, 1 month ago

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

0Thank You

ANSWER

What is who system

Posted by Abhi Sharma 8 years, 1 month ago

CBSE > Class 08 > Science

0 answers

ANSWER

How thrander comes

Posted by Darsit K 8 years, 1 month ago

CBSE > Class 08 > Science

0 answers

ANSWER

Why the male transfer the supm cell in women cell

Posted by Krutik Patel 8 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Aastha Sinha 8 years, 1 month ago

Obviously for reproduction !!?????

1Thank You

ANSWER

Define incubation

Posted by Sanidhya Sisodiya 8 years, 1 month ago

CBSE > Class 08 > Science

0 answers

ANSWER

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

Posted by Janhvi Dwivedi 8 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Mahi Pujari 8 years, 1 month 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.

2Thank You

ANSWER

What is puberty?

Posted by Rahul Anand 8 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Adeeba Haider 8 years, 1 month ago

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

1Thank You

ANSWER

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

Posted by Jatin Rao 8 years, 1 month ago

CBSE > Class 08 > Science

2 answers

Adeeba Haider 8 years, 1 month 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

1Thank You

Gopinath Messi 8 years, 1 month 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

1Thank You

ANSWER

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

Posted by Babita Singh 8 years, 1 month ago

CBSE > Class 08 > Science

2 answers

Preeti Dabral 8 years ago

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

1Thank You

Jatin Rao 8 years, 1 month ago

I think frequency

0Thank You

ANSWER

Which device is used for the electrolysis of water

Posted by Ramaz Goyal 8 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Nishant Kumar 8 years, 1 month ago

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

0Thank You

ANSWER

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

Posted by Dev Diwakar 8 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Ramaz Goyal 8 years, 1 month ago

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

1Thank You

ANSWER

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

Posted by Dev Diwakar 8 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Ramaz Goyal 8 years, 1 month ago

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

0Thank You

ANSWER

Defination of adam's apple

Posted by Payal K 8 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Yash Singh 8 years, 1 month 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.

0Thank You

ANSWER

What is frication

Posted by Ravi Meena 8 years, 1 month ago

CBSE > Class 08 > Science

3 answers

Yashleen Kaur 8 years, 1 month ago

frication is a force which acces

0Thank You

Adeeba Haider 8 years, 1 month ago

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

0Thank You

Nishant Kumar 8 years, 1 month 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.

0Thank You

ANSWER

Forces

Posted by Utsav Kumar 8 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Nishant Kumar 8 years, 1 month ago

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

0Thank You

ANSWER

How the menstruation cycle is prevented

Posted by Mayank Tirankar 8 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Bose Einstein 8 years, 1 month ago

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

0Thank You

ANSWER

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

Posted by Varsha Shetty 8 years, 1 month ago

CBSE > Class 08 > Science

0 answers

ANSWER

Which plastic used in pressure cooker handle

Posted by Varun Kumar 8 years, 1 month ago

CBSE > Class 08 > Science

3 answers

Jayanth Gonwar 8 years, 1 month ago

Thermosetting plastic

0Thank You

Aastha Sinha 8 years, 1 month ago

Teflon...

0Thank You

Akanksha Sinha 8 years, 1 month ago

Tefflon

2Thank You

ANSWER

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

Posted by Rishi Agarwal 8 years, 1 month ago

CBSE > Class 08 > Science

0 answers

ANSWER

What is electrons

Posted by Nishtha Jain 8 years, 1 month ago

CBSE > Class 08 > Science

2 answers

Nishant Kumar 8 years, 1 month ago

The negative charge flowing in any thing is called electron

0Thank You

Yash Singh 8 years, 1 month ago

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

0Thank You

ANSWER

Who was Newton

Posted by Jennie Barman 8 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Amar Kumar 8 years, 1 month 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.

3Thank You

ANSWER

What is primary sexual reproduction

Posted by Sonu Bharti 8 years, 1 month ago

CBSE > Class 08 > Science