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sience revision

Total questions: 71

Worksheet time: 1hrs 5mins

Name
Class
Date
1.

The moment of a force causes an object to

a)

move forward

b)

move backward

c)

stop moving

d)

turn about a fixed point

2.

A nut can be loosen more easily with

a)

A short spanner because a large turning effect can be produced

b)

A short spanner because a larger force can be produced.

c)

A heavy spanner because a larger force can be produced.

d)

long spanner because a large turning effect can be produced.

3.

A force of 120 N is applied perpendicularly on a spanner at a distance of 9 cm from a nut. The torque produced by the force will be

a)

12 Nm

b)

10.8 Nm

c)

15 Nm

d)

12.59 Nm

4.

A boy of weight 600N sits on the see-saw as shown at a distance of 1.5m from the pivot. What is the force F required at the other end to balance the see-saw?

a)

450 N

b)

350 N

c)

4.5 N

d)

200 N

5.

The SI unit of moment of force is –

a)

m

b)

N

c)

kgf

d)

Nm

6.

Jack has a weight of 300 N and sits 2.0 m from the pivot of see-saw. Jill has a weight of 450 N and sits 1.5 m from pivot. Who will move down?

a)

Jack

b)

Jill

c)

Both of them

d)

None of them

7.
The easiest way to open a heavy door  is by applying the force
a)
Near the hinges
b)
In the middle of the door
c)
At the edge of the door far from the hinges
d)
At the top of the door
8.

Which diagram best demonstrates the use of the moment of a force?

a)

A

b)

B

c)

C

d)

D

9.

The figure below shows a man lifting a heavy rock using a steel bar. He pushes downwards on the end of the bar with a force F.


Which pivot positions allows the force F to be as small as possible?

a)

A

b)

B

c)

C

d)

D

10.

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

a)

increases

b)

decreases

c)

stays the same

11.

How do you Calculate Pressure

a)

Force(N)/Area(m2)

b)

Force(kg)/Area(mi2)

c)

Area(m2)/Force(N)

12.

Why won't you sink in mud if you wear boots?

a)

Because the surface area is larger creating less pressure.

b)

Has air in it to keep you floating.

c)

Because the mud won't want you.

13.

What is pressure?

a)

The amount of force exerted on a surface

b)

The surface area of an object

c)

The weight of an object

14.
What is the unit of measurement for pressure?
a)
pascal
b)
grams
c)
milliters
d)
meters
15.
What is the equation used to calculate pressure?
a)
pressure= force/mass
b)
pressure =mass/volume
c)
pressure=area/force
d)
pressure=force/area
16.
Which of these animals would probably cause the greatest pressure on the ground?
a)
A fat cow with big feet
b)
A fat cow with small feet
c)
 A calf with big feet
d)
A calf with small feet
17.
Put the liquids in order from most dense to least dense?
a)
4, 3, 2, 1
b)
1, 2, 3, 4
c)
3, 4, 2, 1, 
d)
4, 3, 1, 2
18.
Which liquid is the least dense?
a)
oil
b)
water
c)
syrup 
d)
plastic bottle
19.
What is the formula for density?
a)
density = mass x volume
b)
density = mass / volume
c)
density = mass + volume
d)
density = mass - volume
20.
Frank has an eraser. It has a mass of 4g, and a volume of 2cm3. What is its density?
a)
8 g/cm3
b)
2 g/cm3
c)
1/2 g/cm3
d)
24 g/cm3
21.
Jack has a rock. The rock has a mass of 14g and a volume of 2cm3. What is the density of the rock?
a)
7 mL
b)
7 g/cm3
c)
28 g/cm3
d)
1/7 g/cm3
22.
What is the volume of Object X?
a)
10.0 cm3
b)
15.0 cm3
c)
20.0 cm3
d)
25.0 cm3
23.
Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its density?
a)
3 g/cm3
b)
1/3 g/cm3
c)
27 g/cm3
d)
39 g/cm3
24.
Why do some substances float on water?
a)
they are warmer than water
b)
they are cooler than water
c)
they are more dense than water
d)
they are less dense than water
25.
Helium balloons rise on earth because
a)
helium is less dense than air
b)
helium is more dense than air
c)
helium is cooler than air
d)
helium is warmer than air
26.
What is the measuring unit for mass?
a)
centimeter 
b)
millimeter 
c)
grams 
d)
pounds
27.
Which units of measurement are used for volume?
a)
grams
b)
centimeters
c)
grams/milliliter
d)
milliliter
28.
What units are used to measure Density?
a)
cm3/g
b)
g
c)
g/cm3
d)
cm3
29.
A crayon has a mass of 10g and volume of 5 mL. What is the density?
a)
30 g/mL
b)
15 g/mL
c)
1 g/mL
d)
2 g/mL
30.

Which of the following is MOST reactive?

a)

Magnesium

b)

Lead

c)

Tin

d)

Copper

e)

Zinc

31.

Which metal is more reactive than calcium?

a)

magnesium

b)

potassium

c)

silver

d)

aluminum

32.

Choose the least reactive metal

a)

calcium

b)

magnesium

c)

iron

d)

copper

33.
What will be reaction if less reactive metal is added in a solution with more reactive metal compound?
a)
vigorous reaction
b)
fizzing gas produced
c)
burns moderately
d)
no reaction
34.
When a metal reacts with oxygen gas, the product is ...
a)
metal hydroxide
b)
metal oxide
c)
metal oxide and oxygen
d)
metal hydroxide and hydrogen gas
35.

In this reactivity series, which of the following is the least reactive element?

a)

Gold

b)

Calcium

c)

Zinc

d)

Potassium

36.

True or False:

Magnesium is more reactive than silver.

a)

True

b)

False

37.

True or False:

Lead is more reactive than iron.

a)

True

b)

False

38.

A segment of DNA that codes for a trait

a)

gene

b)

allele

c)

chromosome

d)

chromatid

39.

Human gametes contain how many chromosomes?

a)

46

b)

23

c)

12

d)

28

40.

Which term refers to physical characteristics that are studied in genetics?

a)

offspring

b)

traits

c)

generations

d)

hybrids

41.

Factors that control traits are called

a)

parents

b)

genes

c)

purebreds

d)

recessives

42.

When gametes cells combine to produce offspring, each gametes cell will contribute

a)

twice the number of chromosomes in body cells.

b)

the normal number of chromosomes in body cells.

c)

half the number of chromosomes in body cells.

d)

one fourth the number of chromosomes in body cells.

43.

A heterozygous organism has

a)

three different alleles for a trait.

b)

two identical alleles for a trait.

c)

only one allele for a trait.

d)

two different alleles for a trait.

44.

Factors that control traits are called

a)

parents

b)

genes

c)

purebreds

d)

recessives

45.

What is a natural resource?

a)

Material from the Earth that people use for their needs.

b)

A place hidden in the mountains.

c)

An object made from natural things.

46.

__________ is an energy resource that WILL NOT run out in the next several hundred years.

a)

Renewable Energy Resource

b)

Non-Renewable Energy Resource

47.

__________ is an energy resource that WILL run out in the next several hundred years.

a)

Renewable Energy Resource

b)

Non-renewable Energy Resource

48.

Which of the following is a renewable resource?

a)

Oil

b)

Solar

c)

Coal

d)

Natural Gas

49.

Which of the following is a non-renewable resource?

a)

Water

b)

Sun

c)

Coal

d)

Win

50.

What are the 3 fossil fuels?

a)

coal, oil, uranium

b)

coal, hydroelectric, oil

c)

natural gas, oil, coal

51.

Wind is a __________ energy resource.

a)

Renewable

b)

Non-renewable

52.

Geothermal Power is a __________ energy resource

a)

Renewable

b)

Non-renewable

53.

Fossil Fuel are?

a)

A group of energy resources that were formed from ancient plants and organisms

b)

A group of dinosaur fossils

c)

A type of gas used for planes

54.

Energy created by the Earth's heat.

a)

Biomass

b)

Solar

c)

Geothermal

d)

Wind

55.

Energy created by burning organic waste material.

a)

Geothermal

b)

Wind

c)

Biomass

d)

Water

56.

Energy created by moving water.

a)

Solar

b)

Wind

c)

Geothermal

d)

Hydropower

57.

A machine with blades that turns because of wind or water.

a)

Turbine

b)

Power plant

c)

Lawnmower

58.
Freezing
a)
Solid to gas
b)
Liquid to solid
c)
Gas to solid
d)
Liquid to gas
59.
Particles of a liquid
a)
are tightly packed together and stay in a fixed position.
b)
have no viscosity.
c)
decrease in volume with increasing temperature.
d)
are free to move around one another but still touch.
60.
Boiling
a)
liquid to gas
b)
gas to solid
c)
gas to liquid
d)
solid to liquid
61.
What is condensation?
a)
gas to solid
b)
gas to liquid
c)
liquid to solid 
d)
solid to liquid 
62.

For the images above, which of the following line segments represent a phase change?

a)

A to B

b)

B to C

c)

C to D

d)

E to F

63.
The state that matter exists in depends on its 
a)
volume 
b)
weight
c)
temperature 
d)
mass
64.

On a hot, humid summer day drops of water form on a can of cold soda. What process caused this to happen?

a)

condensation

b)

freezing

c)

vaporization

d)

deposition

65.
The change from solid to a gas is called ________________.
a)
Sublimation
b)
Freezing
c)
Evaporation
d)
Condensation
66.

Selective breeding is...

a)

a process to create an organism with desired traits from parents with those desired traits

b)

natural method of producing offspring with desired traits

c)

creating a new species

d)

making organisms reproduce during times of stress

67.

One problem with selective breeding is

a)

creating a new species

b)

gene variety is lost

c)

new food sources

68.

The purpose of selective breeding is to

a)

get bigger animals

b)

get smaller animals

c)

create animals with desirable traits

d)

create animals with bad traits

69.

When selective breeding food crops what might a farmer select for? (Select all that apply.)

a)

The plant the produced the most grain

b)

The plant the produced the largest sized grain

c)

The plant that was the most disease resistant

d)

The plant that was the smallest

e)

The smelliest plant

70.
Differences between members of the same species are called
a)
predators
b)
traits
c)
selections
d)
variations
71.
Which of the following is an example of Inherited variation?
a)
Eye colour
b)
Blood type
c)
Skin colour
d)
All of the above

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