QUESTION BANK (2016-17)
SCIENCE
STD: VIII
Topic: Reaching the Age Of Adolescence
Q.I Answer the following questions in one sentence:
(1 mark)
1) Name two duct glands.
2) Define hormones.
3)Which gland is known as the master gland?
4) When does puberty end?
5)What is menopause?
6) What is menarche?
7)What is the special name of the period of life between childhood and adulthood?
Q.II Answer the following questions:
(2marks)
1) What is the function of adrenaline hormone in the body?
2) What is an endocrine gland? Name two endocrine glands.
3) Name one hormone secreted by pituitary gland. State the function of this hormone.
4) Explain why, people are advised to use iodised salt in cooking food.
5) Name six endocrine glands in the human body. Also name the hormones secreted by each one
of these glands.
6) State two secondary sexual characteristics in mature boys and two in mature girls.
7) What is the main function of sex hormones?
8) Name: (a)female sex hormone, and (b)male sex hormone
9) Write the full name of (i)AIDS, and (ii) HIV
10) Who is responsible for the sex of the unborn child: father or mother? Why?
Q.III Answer the following questions in brief:
(3marks)
1) A gland W is located just below the stomach in the human body.The gland W secretes a
hormone X.The deficiency of hormone X in the body causes a disease Y in which the blood sugar
level of a person rises too much. The person having high blood sugar is called Z.What are W,X,Y
and Z?
2) What is an exocrine gland? Name two exocrine glands.
3).What will be the sex of the child born:
a)if X chromosome carrying sperm fuses with an egg cell carrying X chromosomes?
b)if Y chromosome carrying sperm fertilises an ovum containing X chromosomes?
4).Why is it more necessary for adolescents to take bath regularly?
5).What will happen if the water in which tadpoles are growing does not contain sufficient
iodine.
. Q.IV Answer the following questions in detail:
(5Marks)
1).What are the various ways in which AIDS virus (HIV) can be transmitted?
2)Why is population control important?
3) “Say ‘No to drugs’’ . Comment.
Topic : Light
Q.I Answer the following in one sentence:
(1 mark)
1) Define the angle of incidence.
2) What are tactual aids?
3) What is white light?
4) Give one example of natural dispersion.
5) What is meant by lateral inversion?
6) What is the function of eye lids?
7) Which kind of spherical mirrors are used in vehicles?
Q.II Answer the following questions:
(2marks)
1) Why a convex mirror is used as a rear view mirror in cars and other vehicles?
2) In what way is the word AMBULANCE painted in front of the vans? Why is it painted this
way?
3) Why are concave mirrors used by dentist ?
4) A person finds difficulty in viewing distant objects ,while the nearby objects are clearly
visible to him. Which type of lens should he use in his spectacles?
5) Vision‟ is one of the wonderful gifts given to us by God. But most of the people never take
care of their eyes. Care for eyes should be taken; suggest some methods for proper eye care?
6) In a class-room, there were four or five students who were not able to read the material
written on black board. The other students of class helped them to sit at the front seat, so that
they can also read the material written on blackboard. What can be the reason behind it, what
will you recommend these students and what precautions you will insist them?
7)A ray of light strikes a plane mirror XY at an angle of incidence of 65 0, is reflected from this
plane and then strikes a second plane mirror YZ placed at right angles to the first mirror. What is
the angle of reflection for the mirror Y Z?
8) Doctors use concave mirror for examining eyes, ears, nose and throat. Give reason.
9) What is the nature of the image formed by a concave mirror?
10) Name any two letters of English alphabet in which the image formed in a plane mirror
appears exactly like the letters.
Q.III Answer the following questions in brief:
(3marks)
1) a) What is myopia?
b) How is it caused?
c) How can it be corrected?
2) How is Braille system used?
3) Explain how a screen reader can help visually impaired people?
4) Distinguish between real image and virtual image.
5) Distinguish between a concave and convex mirror.
Q.IV Answer the following questions in detail:
(5Marks)
1)On the rainy day, Ram reached his grandfather’s place in village. On the way to house he saw
a beautiful rainbow in this sky. In night, he saw lots of twinkling stars in the clear sky. He was
very excited to see this beautiful natural phenomenon, which he was not able to see in the city,
where he lived with his father. Do you think that pollution in atmosphere effects the formation of
rainbow and twinkling of stars. Do you agree with the fact that pollution free environment will
strengthen such natural phenomenon in the cities as well. Elaborate the answer.
2) Man A has a defect of vision due to which he cannot see the nearby objects clearly ( though
he can see the distant objects clearly). On the other hand, man B has a defect of vision due to
which he cannot see the distant objects clearly ( though he can see the nearby objects
clearly).The defect in man A can be corrected by using spectacles containing lenses C whereas
the defect in man B can be corrected by using spectacles containing lenses D
a) Name the defect of vision in man i) A, and ii) B
b) What type of lenses are i) C , and ii) D ?
3)How do visually impaired people communicate?
Topic: Solar system
Q.I Answer the following in one sentence:
(1 mark)
1) Name two planets having no satellites.
2) Name any two celestial bodies.
3)How many galaxies are there in the universe?
4)What are asteroids?
5)What are meteorites ?
6)Name the astronauts who landed on the moon in 1969.
7)Name the comet,which reappears after 76 years.
Q.II Answer the following questions:
1)Explain how artificial satellites help in trans mission of television programmes
areas.
(2marks)
over large
2) Venus is hotter than mercury, though it is farther away from the Sun. Why?
3).How is the tail of a comet formed?
4)The number of main stars in constellation A is 5, in constellation B is 7, in constellation C can
be 7 or 8, whereas in constellation D is usually 9. Name the constellations A, B, C, and D.
5)What is meant by remote sensing?
6)What is shooting star?
7)What is the cause of seasons on the earth?
8)Give two main characteristics of Uranus.
9) How is the tail of a comet formed?
10)Write the differences between the stars and planets.
Q.III Answer the following questions in brief:
(3marks)
1) Name the terrestrial planets.Why are they called by this name ?
2) Draw the diagram of orion and explain it.
3) Name the Jovian planets. Give their general characteristics.
4)What is the difference between meteors and meteorites ?
5) How can you locate the star – Sirius?
Q.IV Answer the following questions in detail:
(5Marks)
1) Give reasons why life is possible only on earth.
2) What is meant by the phases of moon ? What causes the phases of the moon ?
3) 1)X is a group of stars which is visible during the summer season in the early part of the night.
It can be seen clearly in the month of April in the northern part of the sky. It resembles a bowl
with a handle. It also resembles a big kite with a tail.
a) What is the general name of groups of stars like X ?
b) Write any two names of X.
c) Is it a part of our Solar system?
d) How many bright stars are usually observed in X ?