VISHALINTERNATIONALSCHOOL

Term – II (2017-2018

Subject: Science

Time: 3 hrs. Class: VIII M.M.: 80

Note: - 1. It is compulsory to attempt all questions.

2. Marks are given against each questions.

3. Handwriting should be neat and clean.

Q.1 Fill in the blanks:-10

a)The secretion of hormones is controlled by ______gland.

b)Nonmetallic oxides are ______or ______in nature.

c)The disease______in cattle is caused by a bacterium.

d)The living substance of a cell is called______.

e)Pressure in a liquid increases with______.

f)______Friction is less than sliding friction.

g)Sound is produced by a ______body.

h)______water does not conduct electricity.

i)The persistence of vision for human eye is ______of a second.

j)______is the largest asteroid.

Q.2 Choose the correct answer.10

a)Diseases like cholera, lymphoid and jaundice are caused due to:-

i) Polluted air ii) Polluted land iii) Polluted water iv) Polluted soil.

b)The physical quantity described by force per unit area is :-

i) Momentum ii) Pressureiii) Work iv) Energy

c)The hormone that help the body to adjust the stress is………………….

i) insulinii) adrenaliniii) Thyroxiniv) testosterone

d)At first ,cells were discovered by

i) Matthias Jacob ii) Antoine van lee wen hock

iii) Robert Hooke iv) RudolfVirchow

e)Force of friction and weight of a body are:-

i) Directly proportionalii) Inversely Proportional

iii) Indirectly proportionaliv) Do not depend on each other

f)The point under the ground where vibrations originate is called:-

i) Epicenter ii) hypocenter iii) Focus iv) Fault

g)A shooting star is the name given to a:-

i) Meteor ii) Comet iii) asteroid iv) Meteorite

h)Ultrasonic sound has the frequency range:-

i) Greater than 20,000 Hz ii) less than 20 Hz

iii) Greater than 20 Hz iv) less than 20,000 Hz

i)During hydrolysis, hydrogen gas collects at

i) Cathode ii) anode iii) diode iv) both electrodes

Q.3 State true or false:-5

a)A magnetic compass can also be used as a current detector.

b)Aquatic animals cannot communicate as sound cannot travels through liquids.

c)The sex chromosomes in males is of X types.

d)The image formed by a plane mirror is behind the mirror and can be obtained on a screen.

e)A group of stare forming a particular pattern is called comet.

Q.4 Very short answer type questions: -10

a)What is the audible name of human ear?

b)What is the cause of friction between two surfaces incontact?

c)What is a fluid?

d)Why cell membrane is called selectively permeable?

e)What happens when two forces act in opposite direction?

f)What is the difference between a cathode and an Anode?

g)What are the defects of eye?

h)What distinguishes pole star from other stars?

i)How many chromosomes are there in human body?

j)j) Name a disease caused by a i) Virus and ii) bacteria in humans.

Q.5 Short answer type questions: -30

a)What is Nitrogen fixation?

b)What are hormones? Name the male and female hormones.

c)If the frequency of an oscillatoris 25 Hz, What would be its time period?

d)What is amplitude of vibrations? How is amplitude related to loudness?

e)What is Reflection? When does an object become visible to us?

f)Name a planet that is :-

i) Hottest

ii) Coldest

iii) Smallest

iv) Windiest

v) Biggest and fastest.

g)Which scale measures the magnitude of an earthquake? How does this scale differ from other scales?

h)What is Electroplating?

i)What is the function of i) eye lens ii) pupil iii) Rods and cones.

j)A ball rolled on the ground stops after some time. Why? Name the force responsible for it.

Q.6 Long Answer Type questions: -15

a)How would you electroplate an iron spoon with copper? Describe with diagram.

OR

How do we heard sound?

b)What is the difference between a plant cell and an animal’s cell? Explain with diagrams.

OR

Draw a labelled diagram of human eye. How is the image formed in eyes transmitted to the brain?

c)What is a satellite? How does a natural satellite differ from an artificial satellite?

OR

What is Acid Rain? How does it affect the environment?