Frank Cce Everyday Science Solutions for Class 8 Science Chapter 22 Formative Assessment 4 are provided here with simple step-by-step explanations. These solutions for Formative Assessment 4 are extremely popular among class 8 students for Science Formative Assessment 4 Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the Frank Cce Everyday Science Book of class 8 Science Chapter 22 are provided here for you for free. You will also love the ad-free experience on Meritnation’s Frank Cce Everyday Science Solutions. All Frank Cce Everyday Science Solutions for class 8 Science are prepared by experts and are 100% accurate.

Page No 286:

Answer:

(b) epicentre
Epicentre is the point that is vertically above the surface of focus.
Focus is the point of origin of an earthquake inside the earth.

Page No 286:

Answer:

(a) 25 cm
For a normal eye, the near point is at a distance of about 25 cm.

Page No 286:

Answer:

(c) Asteroid
Asteroid is a metallic and rocky substance that moves around the sun in between the orbits of Mars and Jupiter.

Page No 286:

Answer:

(b) 1973
The Chipko Movement started in March 1973.

Page No 286:

Answer:

(c) potable water
Water that is suitable for drinking water is called potable water.

Page No 286:

Answer:

1. The point of origin of an earthquake inside the earth is called focus.
2. The image which cannot be obtained on a screen is called virtual image.
3. Working of a periscope is based on the principle of successive reflection of plane mirrors.
4. The nearest visible galaxy is Andromeda galaxy.
5. The process of adding chlorine to filtered water to kill germs is known as chlorination.

Page No 286:

Answer:

Column A Column B
1. Seismograph (b) Earthquake
2. Retina (a) Eyes
3. Pole star (e) Ursa Minor
4. UV radiations (c) Skin cancer
5. Greenhouse gas (d) Methane

Page No 286:

Answer:

1. False
Oppositely charged bodies attract each other.
2. True
3. False
Moon is not a luminous body because it does not emit any light of its own. It reflects the light falling on its surface from sun.
4. True
5. True



Page No 287:

Answer:

1. R: Red
2. O: Orange
3. Y: Yellow
4. G: Green
5. B: Blue
6. I: Indigo
7. V: Violet

Page No 287:

Answer:

A lightning conductor is a pointed metal rod that is erected on top of tall buildings. One of its ends is buried deep in the earth. It acts as a conductor of light and saves buildings from lightning during a thunderstorm. 

Page No 287:

Answer:

Dispersion of light can be defined as the splitting of white light into its constituent colours. When white light falls on one face of a prism, it emerges out of the other face in the form of a band of seven colours called spectrum of white light. The spectrum of white light has seven colours, namely violet, indigo, blue, green, yellow, orange and red (VIBGYOR).

Page No 287:

Answer:

Meteorites are fractions of celestial bodies, such as asteroids or comets, which after entering the earth's atmosphere survive the friction presented by earth's atmosphere and their crash with the earth's surface. Before entering the earth's atmosphere, they are called meteoroids. On entering the earth's atmosphere, meteoroids catch fire due to the atmospheric friction and appear like falling stars. Meteoroids are, however, much smaller than stars, which are several times bigger luminous bodies.

Page No 287:

Answer:

Four sources of water pollution:
1. Sewage
2. Industrial waste
3. Chemical fertilisers and insecticides
4. Synthetic detergent

Page No 287:

Answer:

Following measures can save the life of a person trapped under a rubble:

1. We must keep talking to that person to determine the exact location of that person so that we can save him as soon as possible.
2. We must call friends and make a rescue team.
3. We must remove the debris or rubble under which that person has been trapped by using special equipment or with the help of the rescuing team.
4. We must call an ambulance or a doctor at disaster spot.

Page No 287:

Answer:


A pencil ABC is kept in front of mirror. A and C are the extreme points of the pencil. The two rays from each point are incident on the surface of the mirror, which reflects them back at the same angle at which they fall on the mirror. Now, if these reflected rays are extended backwards, image A'B'C' is formed. The extended rays are represented with the help of dotted lines. The image formed is a virtual image. The size of the image is equal to the size of object.

Page No 287:

Answer:

Constellation is a group of star occurring in space having their arrangement similar to the shape of different animals. There are 88  identified constellations. Some well-know constellations are discussed below:

1. Ursa Major or Great Bear:
It consists of seven stars and it resembles a big bear. Stars 1, 2 , 3 and 4 (in the diagram shown below) represent the body and the stars 5, 6 and 7 represent the tail of the great bear. It is clearly visible in the northern part of the sky during the summer months from April to September.


2. Ursa Minor or Little Bear:
It is also a group of seven stars and is very much similar to the Ursa Major but smaller in size. It resembles a small bear or a question mark or a kite with a long tail. The end of the tail of Ursa Minor is marked by a star with lesser brightness called pole star (Dhruva tara). Ursa Minor can be seen during summer in the month of July.


3. Orion or Hunter:
It is seen during winters. It looks like a hunter. The body is formed by major stars and head and limbs are formed by other less bright stars.


4. Scorpio:
It is visible during winters. It looks like a scorpion.


5. Cassiopeia:
It can be seen in the month of October in the northern sky near pole star. It looks like a huge 'W'.



6. Pleiades​:
It is visible during winters. In this constellation, the stars do not have any particular shape.

Page No 287:

Answer:

The overall increase in the temperature of earth due to the greenhouse effect is called global warming. It is a global phenomenon and might be responsible for the changes in the climatic patterns on earth.

Carbon dioxide and a few other gases present in the atmosphere allow the high-energy radiation from the sun to enter the earth's lower atmosphere and strike its surface. But these gases do not allow the low-energy radiation, released by the earth after getting heated up, to escape. These gases, called greenhouse gases, trap the radiation from earth in its own atmosphere and increase the earth's temperature. This phenomenon, called the greenhouse effect, causes global warming.



View NCERT Solutions for all chapters of Class 8