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science 8 final

Total questions: 104

Worksheet time: 2hrs 0mins

Name
Class
Date
1.
What is the equation used to calculate pressure?
a)
pressure= force/mass
b)
pressure =mass/volume
c)
pressure=area/force
d)
pressure=force/area
2.
Fluids can also include__ and__. 
a)
solids and liquids
b)
solids and gases
c)
liquids and gases
d)
liquids
3.
What is the unit of measurement for pressure?
a)
pascal
b)
grams
c)
milliters
d)
meters
4.
Army tank tracks are useful for travelling through the mud because..
a)
they decrease the force the vehicle exerts on the ground
b)
they increase the force the vehicle exerts on the ground
c)
they decrease the pressure the vehicle exerts on the ground
d)
they increase the pressure the vehicle exerts on the ground
5.
Atmospheric pressure increases as you move towards lower elevations and decreases as you move into higher elevations.
a)
True
b)
False
6.
What pressure does a 4000N horse exert on the ground if each foot is 10cm2?
a)
40 N/cm2
b)
100 N/cm2
c)
400 N/cm2
d)
10 N/cm2
7.
Where is pressure the greatest on the dam?
a)
D
b)
C
c)
B
d)
A
8.

In Fig two boys A and B are shown applying force on a block. If the block moves towards the right, which one of the following statements is correct?

a)

Magnitude of force applied by A is greater than that of B

b)

Magnitude of force applied by A is smaller than that of B.

c)

Net force on the block is towards A.

d)

Magnitude of force applied by A is equal to that of B.

9.

A brick is kept in three different ways on a table as shown in Fig. The pressure exerted by the brick on the table will be

a)

maximum in position A

b)

maximum in position B

c)

maximum in position C

d)

equal in all cases.

10.

which force is non contact force

a)

gravitational

b)

magnetic

c)

electrostatic

d)

all of the above

11.

what kind of force is Friction

(a)  

12.

Watch the green man. Which force(s) are acting in this situation?

a)

Frictional Force only.

b)

Gravitational Force only.

c)

Muscular Force only.

d)

Muscular and Gravitational Force.

13.

At higher altitudes, which one becomes true?

a)

Higher the altitude, higher the atmospheric pressure.

b)

Higher the altitude, greater the force exerted by air molecules.

c)

It's an example of fluid pressure.

d)

The higher you go, lesser is the atmospheric pressure.

14.

Watch the green man skating. Choose all options that are correct.

a)

Both Contact and Non-Contact forces acting here.

b)

Non-Contact force is only acting here.

c)

Rolling Friction and Gravitational Force are present.

d)

Sliding Friction and Gravitational Force are present.

15.

Observe the image carefully. What's NOT happening here?

a)

People on the left side win the game.

b)

Nobody wins.

c)

This is balanced situation.

d)

Resultant Force is zero.

16.
What is force?
a)
A push exerted on an object
b)
A push or pull exerted on an object
c)
A pull exerted on an object
d)
Nothing
17.

When you increase your depth under water, the water pressure on your body

a)

increases

b)

decreases

c)

stays the same

18.
If there are two forces going in the same direction how would you find the net force?
a)
Subtract
b)
Add
c)
Neither
d)
Multiply
19.
How do you calculate Net Force if the forces are going different directions?
a)
add them together
b)
you don't
c)
using pi
d)
subtract them
20.

Bacteria is known as__________________ in an ecosystem when feeding on dead organisms.

a)

Decomposers

b)

Herbivore

c)

Pathogens

d)

Infections

21.

Fungi is beneficial to us beacause of the following reason

a)

They are a source of oxygen

b)

They can clean up pollution

c)

They are a source of antibiotics

d)

They help to clean run off from waste

22.

Influenza is a disease caused due to

a)

bacteria

b)

Virus

c)

Protozoa

d)

None of the above

23.

A Bacteria responsible for curdling of milk is

a)

Rhizobium

b)

Oscillatoria

c)

Lactobacillus

d)

Plasmodium

24.

The Fermentation process is discovered by

a)

Louis Pasture

b)

Alexander flaming

c)

Edward jenner

d)

John Mendal

25.

Mushroom belongs to

a)

Algae

b)

Virus

c)

Fungi

d)

None of the above

26.

Rhizobium bacteria

a)

Help in Digestion

b)

Help in nitrogen fixation

c)

Cause diseases

d)

All the above

27.

Penicillium is a

a)

Algae

b)

Fungus

c)

Bacteria

d)

Yeast

28.

Malaria is caused bby

a)

Protozoa

b)

Virus

c)

Algae

d)

Bacteria

29.

Amoeba belongs to

a)

Algae

b)

Fungi

c)

Virus

d)

Protozoa

30.

What is the best description of an opaque material?

a)

no light passes through the material

b)

some light passes through the material

c)

all light passes through the material

31.

What is the best description of a transparent material?

a)

no light passes through the material

b)

some light passes through the material

c)

all light passes through the material

32.

What is the best description of a translucent material?

a)

no light passes through the material

b)

some light passes through the material

c)

all light passes through the material

33.

What type of object is shown in the picture?

a)

opaque

b)

transparent

c)

translucent

34.
The ray of light that strikes a reflecting surface is called ________.
a)
incident ray
b)
reflected ray
c)
normal ray
d)
none of the above
35.
If the angle of incidence is 45 degree, what is the angle between the incident ray and reflecting surface
a)
45
b)
90
c)
180
d)
none of the above
36.
The bouncing off of light rays from the surface of an object such as a mirror or other shiny surface is called:
a)
mirror
b)
laser
c)
reflection
d)
refraction
37.

When a light ray bounces off a rough surface, it reflects all over the place

a)

Diffraction

b)

Reverberation

c)

Scattering

d)

Transmission

38.

When this occurs, light rays pass from one transparent medium to another transparent medium.

a)

Absorbtion

b)

Transmission

c)

Relfection

d)

Refraction

39.

Which of these provides the best explanation for why the pencil appears broken?

a)

The pencil absorbs the light rays that hit it.

b)

Water reflects light rays away from the pencil.

c)

Light rays are bent by the water in the glass.

d)

The surface of the water reflects the light rays.

40.

Light travels in straight lines until reflected by another object. Which illustration best shows the light being reflected?

a)
b)
c)
d)
41.
What is a prism?
a)
a transparent object that separates white light
b)
an opaque object that appears black
c)
a translucent object
42.
The full spectrum of light energy is called the__________
a)
broad spectrum
b)
electromagnetic spectrum
c)
helium spectrum 
d)
natural light spectrum
43.

When a light ray strikes a smooth, flat surface, what is the relationship between the angle of incidence and the angle of reflection?

a)

They are equal.

b)

The angle of incidence is twice that of the angle of reflection.

c)

The angle of reflection is twice that of the angle of incidence.

d)

They combine to add up to 180o.

44.

In this diagram, which is the angle of incidence?

a)

Angle A

b)

Angle B

c)

Angle C

d)

Angle D

45.

Objects that generate their own light are called:

a)

luminous objects.

b)

illuminated objects.

c)

non-luminous objects.

d)

reflective objects.

46.

What makes it possible to see an object when looking through a periscope?

a)

It contains mirrors that reflect the object.

b)

It magnifies small objects so they can be seen.

c)

It bends the light rays passing through it.

d)

It separates the light into different colors.

47.

Which will make the darkest shadow?

a)

Sheet of thin tissue paper.

b)

glass window

c)

wooden chopping board

d)

plastic bottle

48.

When an object moves closer to a light source, its shadow...

a)

Gets smaller

b)

Gets bigger

c)

Changes shape

d)

Stays the same size

49.

The longer the distance between the light source and the object, the ........................... the size of the shadow form on the screen.

a)

larger

b)

smaller

c)

not change

50.
Hearing your brother's music playing from down the hall is an example of what type of wave interaction?
a)
reflection
b)
interference
c)
refraction
d)
diffraction
51.
You and your father inspect an empty house with the hopes of buying it. You walk through the rooms talking to one another, and you notice that your voices and footsteps are echoing in the big, empty house. What causes the echo?
a)
sound waves reflecting off smooth, flat surfaces throughout the house
b)
sound waves moving around the large rooms
c)
sound waves moving slowly through air
d)
sound waves refracting around corners in the empty rooms
52.
If distance C on the diagram increased, what would happen to the pitch? 
a)
The pitch would be louder. 
b)
The pitch would be softer. 
c)
The pitch would be higher. 
d)
The pitch would be lower. 
53.
If the distance represented by the letter A were increased, how would it change the way the sound was heard?
a)
The sound would be higher. 
b)
The sound would be lower. 
c)
The sound would be softer. 
d)
The sound would be louder. 
54.
______ is how high or low a sound is; depends on the frequency.
a)
pitch
b)
frequency
c)
sound
d)
medium
55.
A wave in which the particles vibrate in the same direction as that in which the wave is traveling; sound waves
a)
longitudinal wave
b)
ocean wave
c)
transverse wave
d)
mechanical wave
56.
A soft, low pitch sound would have which of the following....
a)
low frequency 
high amplitude 
b)
high frequency 
high amplitude 
c)
low frequency 
low wavelength  
d)
low frequency
low amplitude 
57.
When comparing the two waves that are shown, how would Wave A (green wave) differ than Wave B (black wave)?
a)
Wave A and B have the same amplitude, but wave B (black) has a lower pitch.
b)
Wave A and B have the same amplitude, but Wave A has a lower pitch. 
c)
Wave A and B have the same pitch, but Wave A is a softer sound. 
d)
Wave A and B have the same pitch, but Wave B is a softer sound. 
58.
A reflected sound wave is know as a/an ___________.
a)
frequency
b)
pitch
c)
echo
d)
rarefaction
59.
After the train passed, the pitch of the train whistle became lower. This change in sound would be represented by what change in the diagram above? 
a)
The distance represented by C would increase. 
b)
The distance represented by C would decrease. 
c)
The distance represented by D would increase. 
d)
The distance represented by D would decrease. 
60.
A wave that requires a medium through which to travel
a)
mechanical wave
b)
chemical wave
c)
electromagnetic wave
d)
pitch
61.
If I increase the energy of a wave, what will happen to the pitch? 
a)
stays the same
b)
increases
(higher pitch)
c)
decreases
(lower pitch)
d)
goes up but levels off
62.
A soft, high pitch sound would have which of the following....
a)
low frequency 
high amplitude
b)
low frequency 
low wavelength 
c)
high frequency 
low amplitude
d)
high frequency 
high amplitude 
63.
______ is how loud or soft a sound is; depends on the amplitude.
a)
pitch
b)
frequency
c)
loudness
d)
medium
64.
What best describes the doppler effect?
a)
An apparent change in frequency of a wave due to the relative motion between a wave source and an observer
b)
When sound changes pitch
c)
When light changes color
d)
An apparent change in the amplitude of a wave due to the relative motion between a wave source and an observer.
65.
When the car moves AWAY from you, its horn seems...
a)
Low pitched
b)
High pitched
c)
Normal
66.
When an ambulance move TOWARD you it sounds ________ pitched. 
a)
high
b)
low
c)
medium
67.
When does sound refract?
a)
When it travels in a vacuum.
b)
When it moves through cold air.
c)
When it travels in only one medium.
d)
When it moves from one medium to another.
68.
How are light waves and sound waves similar?
a)
The both carry matter & energy
b)
They both carry energy.
c)
They both travel in vacuums.
d)
They both carry matter.
69.
What can you tell about this object's motion?
a)
Moving to the North (up).
b)
Moving to the South (down). 
c)
Moving to the West (left). 
d)
Moving to the East (right). 
70.

Lightning is an______but on a huge scale.

a)

Charged object

b)

Electric spark

c)

A phenomena

d)

None of these

71.

A charged ballon repell a charged ballon.

a)

True

b)

False

72.

A object that is used to test wether an object is carrying charge or not.

a)

Seismograph

b)

Earthing

c)

Electroscope

d)

Richter scale

73.

A major earthquake occured in India on 8th October 2005 in_______.

a)

Gujarat

b)

Bhuj

c)

Kashmir

d)

Option a. and b.

74.

The weak zone are known as sesmic or ________.

a)

Fault zone

b)

Good zone

c)

Brushing past

d)

Earthquake

75.

Take shelter under a table and stay there till the shaking stops.

In which phenomena we should do this?

a)

Volcanic eruption

b)

Earthquake

c)

Lightning

d)

Tsunami

76.

In the core of the earth there is _________.

a)

Lava

b)

Magma

c)

Soil

d)

Option a. and b.

77.

The process of transferring of charge from a charged object to the earth is called as ________.

a)

Richter scale

b)

Sesmic waves

c)

Tide

d)

Earthing

78.

What is this position?

a)

Safe position during earthquake

b)

Safe position when we are afraid.

c)

Safe position when a dog is there in your front.

d)

Safe position during lightning

79.

______ is provided in building to protect us from electrical shocks due to to any leakage of electrical current.

a)

Discharged

b)

Earthing

c)

Lightning

d)

Birds

80.

A major tsunami occured in the Indian Ocean on 26 December __________.

a)

2000

b)

2007

c)

2004

d)

I don't know

81.

What is this diagram tells us?

a)

Movements of earth's plates

b)

Seismic zone

c)

Slice of cake

d)

All of the above

82.

Which is the phenomena which is not predictable by scienentist?

a)

Lightning

b)

Earthquake

c)

Thunder storm

d)

Tsunami

83.

The power of an earthquake is expressed in terms of a magnitude on a scale called the __________.

a)

Richter photo

b)

Richter scale

c)

Seismic waves

d)

Option b. and c.

84.

What is shown in this diagram?

a)

Structure of the earth

b)

Structure of mars

c)

Structure of plates of the earth

d)

Structure of an apple

85.

The process of depositing a layer of any desired metal on another material by means of electricity is called

a)

Electrolyis

b)

Electric current

c)

Electroplating

d)

Electromagnetism

86.

What is the full form for CFL

a)

Combustible fluoride lamp

b)

Compact fluoride lamp

c)

Combustible fluorescent lamp

d)

Compact fluorescent lamp

87.

The metal rods or plates through which the current enters or leaves the conducting solution are called

a)

electrodes

b)

electrolytes

c)

ions

d)

conductors

88.

Adding common salt to distilled water makes it

a)

Good Conductor

b)

Poor Conductor

c)

No change

d)

Both A and B

89.

Which one of the following solutions will not conduct electricity?

a)

lemon juice

b)

vinegar

c)

tap water

d)

vegetable oil

90.

the method of purification of metals by using electricity is known as

a)

electroplating

b)

electrorefining

c)

electrometal

d)

none of these

91.

Select the poor conductors of electricity

a)

Honey

b)

Plastic

c)

Vinegar

d)

Distilled Water

92.

Electroplating prevents

a)

electric current

b)

chemical effect

c)

lightening

d)

rusting

93.

LED stands for

a)

light emitting diode

b)

light efficient diode

c)

length emitting diode

d)

light emitting device

94.

Find the odd one out

a)

Distilled water

b)

Vegetable oil

c)

Milk

d)

Honey

95.

Period between childhood and adulthoo

a)

citizenship

b)

peers

c)

adolescence

d)

hormones

96.

Between the ages of 11 and 14 girls generally grow how many inches?

a)

2

b)

3

c)

5

d)

7

97.

For boys, the adolescent growth spurt generally begins between what ages?

a)

9 and 12

b)

13 and 16

c)

11 and 14

d)

15 and 18

98.

What usually grows first in a teen?

a)

head and shoulders

b)

hands and feet

c)

length of legs

d)

length of arms

99.

Adolescence is a stage of life which lasts for how many years

a)

1 year

b)

10 years

c)

5 years

d)

15 years

100.

Which of the following is not a physical change which occurs during adolescence

a)

getting taller

b)

growing hair

c)

produce more sweat

d)

memory function

101.

adolescence is a period of time where individuals

a)

strive for independence

b)

explore personal identity

c)

have change in friendship

d)

all of the above

102.

What is the age range of adolescence

a)

5 - 12

b)

11 - 19

c)

15 - 30

d)

21 - 50

103.

The 5 dimensions of health include

a)

Physical, emotional, social, practical, intelligence

b)

Be aware, keep learning, be active, help others, ways to connect

c)

Think, Feel, Say, Do

d)

Physical, Social, Emotional, Mental, Spiritual

104.

Communicating effectively comes under which dimension of health

a)

Social

b)

Physical

c)

Emotional

d)

Mental

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