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Secondary 4 - Science Review

Total questions: 50

Worksheet time: 9hrs 10mins

Name
Class
Date
1.

Which of the following element is an alkali-metal

a)

Lithium (Li)

b)

Beryllium (Be)

c)

Fluorine (F)

d)

Neon (Ne)

2.

Which of the following element is the most explosive?

a)

Potassium (K)

b)

Magnesium (Mg)

c)

Chlorine (Cl)

d)

Helium (He)

3.

Which of the following element is stable (doesn't form molecules with other elements)

a)

Sodium (Na)

b)

Calcium (Ca)

c)

Bromine (Br)

d)

Neon (Ne)

4.

Who am I?

I am an alkaline-earth metal with 2 electrons shells.

a)

Helium (He)

b)

Lithium (Li)

c)

Beryllium (Be)

d)

Magnesium (Mg)

5.

Which of the following element form a negative ion.

a)

Sodium (Na)

b)

Aluminum (Al)

c)

Fluorine (F)

d)

Argon (Ar)

6.

What is the charge of a boron (B) ion?

a)

-2

b)

+2

c)

-3

d)

+3

7.

How many valence electrons does a calcium atom have?

a)

2

b)

4

c)

20

d)

40

8.

Which of the following molecule represents an acid?

a)

Ba(OH)2

b)

H2SO4

c)

KCl

d)

Mg(Cl)2

9.

Which of the following molecules represents an electrolyte?

a)

C6H12O6

b)

H2O

c)

CO2

d)

Mg(Cl)2

10.

Which of the following equation is a balanced reaction for the neutralization of an acid and a base?

a)

H2SO4 + Ba(OH)2 -> BaSO4 + H2O

b)

Mg(OH)2 + H2CO3 -> MgCO3 + 2 H2O

c)

KOH + HCl -> KH + ClOH

d)

2 H2SO4 + O2 -> 2 SO4 + 2 H2O

11.

When benzene is burned carbon dioxide and water are produced.

____C6H6 + ____O2 -> ____CO2 + ____H2O

What is the coefficient of O2 when the reaction is balanced?

a)

1

b)

9

c)

15

d)

18

12.

During a reaction, 2 Mg + O2 -> 2MgO, 97.2g of magnesium (Mg) reacts with 64.0g of oxygen gas (O2). What mass of magnesium oxide (MgO) was produced?

a)

161.2 g

b)

258.4 g

c)

260.8 g

d)

516.8 g

13.

Which of the following reactions represents a combustion?

a)

HCl + NaOH -> NaCl + H2O

b)

4 Fe + 3 O2 -> 2 Fe2O3

c)

2 H2O -> 2 H2 + O2

d)

6 CO2 + 6 H2O ->

C6H12O6 + 6 O2

14.

You are testing the nature of a solution with litmus paper. Here are your results:

Red litmus paper turns blue

Blue litmus paper stays blue

What is the nature of the solution?

a)

Acid

b)

Base

c)

Salt

d)

Water

15.

The fire triangle presents the 3 conditions necessary to make a fire. Which of the following statements refers to the presence of an oxidizing agent?

a)

If you let the fire burn in the fireplace, it will eventually go out on its own.

b)

During a fire drill, firefighters ask to close doors and windows before going out.

c)

In order to prevent the spread of a fire, the firefighters water the trees and buildings around it.

d)

When it's very hot in the summer, a fire can spontaneously ignite a bale of hay.

16.

Here is some information about 2 aqueous solutions:

Solution A: pH 6

Solution B: pH 2

Which of the following statement is true?

a)

Solution A is a very strong acid

b)

Solution B is a very strong base

c)

Solution B is 40 times more acidic that solution A

d)

Solution B is 10000 times more acidic than solution A

17.

A 200g sample of soil contains 0.03g of contaminant. What is the concentration of contaminant of that soil in ppm?

a)

0.00015 ppm

b)

0.15 ppm

c)

15 ppm

d)

150 ppm

18.

A 500 mL sample of water has a chlorine concentration of 70 ppm. What is the mass of chlorine found in this solution?

a)

35 mg

b)

35 g

c)

35000 mg

d)

35000 g

19.

Which of the following choices represents the highest concentration?

a)

45 g100 mL\frac{45\ g}{100\ mL}

b)

50 gL\frac{50\ g}{L}

c)

30 %

d)

600 ppm

20.

Magnesium can be found in many foods, such as whole wheat bread, which contains about 850 ppm of magnesium. Assuming that a slice of whole wheat bread has a mass of about 30g, what mass of magnesium will you get from the whole wheat bread if you eat a sandwich with 2 slices?

a)

25.5 mg

b)

28.3 mg

c)

51.0 mg

d)

56.7 mg

21.

Consider the diagram of an electrical circuit. Which of the following statement is true?

a)

This is a series circuit. If one of the light bulb burns, the whole circuit stops working.

b)

This is a parallel circuit. If one of the light bulb burns, the whole circuit stops working.

c)

This is a series circuit. If one of the light bulb burns, the rest of the circuit keeps working.

d)

This is a parallel circuit. If one of the light bulb burns, the rest of the circuit keeps working.

22.

Consider the following experimental results:

A.         Two glass rods rubbed on silk repel each other.

B.         An ebonite rod rubbed on fur attracts a glass rod rubbed on silk.

C.         A piece of sulphur rubbed on flannel repels an ebonite rod rubbed on fur.

True or False?

The sulphur and the glass rod will attract each other.

a)

True

b)

False

23.

What is the resistance of a resistor in a circuit with a current intensity of 8 A and a potential difference of 400V?

a)

0.02 Ω

b)

5 Ω

c)

50 Ω

d)

3200 Ω

24.

A hairdryer used on a 120 V electrical circuit has a resistance of 8 Ω. What is the power is this hairdryer.

a)

15 W

b)

120 W

c)

960 W

d)

1800 W

25.

How much electrical energy is used by a hairdryer with a power of 1500 W if it used for 10 minutes?

a)

150 J

b)

15 000J

c)

90 000 J

d)

900 000 J

26.

A toaster uses 720 000J of electrical energy in 5 minutes. What is the electrical power of this toaster in watts?

a)

2.4 W

b)

144 W

c)

2400 W

d)

144 000 W

27.

During a lab experiment, you have to assemble a circuit based on the following information:

 

      The circuit is composed of a 6.0-V battery connected to a 10-Ω resistor. It includes an ammeter connected in series. How much electrical energy will the resistor use in one minute of work?

a)

36 J

b)

60 J

c)

216 J

d)

21600 J

28.

How much electrical energy will be used by a resistor connected to a 400V circuit with a 15 A current if it is working for 90 minutes?

a)

9 kWh

b)

40 kWh

c)

2400 kWh

d)

9 000 kWh

29.

About the watershed image, which of the following statements is TRUE?

a)

A spill in the river will contaminate the marsh, the stream and the lake.

b)

A spill in the stream will contaminate the marsh and the lake, but not the river.

c)

A spill in the marsh will contaminate the lake, but not the river and the stream.

d)

A spill in the lake will contaminate the marsh, the river and the stream.

30.

Which of the following statements about permafrost is false?

a)

Permafrost is ground that has been frozen for at least 2 years.

b)

Melting of permafrost has no impact on the climate and greenhouse effect.

c)

Melting of permafrost releases large amount of methane in the atmosphere.

d)

Melting of permafrost increases the risk of landslides.

31.

Which of the following choices is an example of non renewable energy?

a)

Hydropower

b)

Solar power

c)

Nuclear energy

d)

Geothermal energy

32.

Which of the following energy source does not come from the lithosphere?

a)

Geothermal energy

b)

Biomass

c)

Fossil fuels

d)

Nuclear energy

33.

True of False?

The greenhouse effect is a consequence of human pollution.

a)

True

b)

False

34.

True or False?

The energy found in waves and tides is not strong enough to be used as a source of energy.

a)

True

b)

False

35.

What type of constraint is represented on this picture?

a)

Compression

b)

Conduction

c)

Tension

d)

Dilatation

36.

Which of the following choices is a characteristic of a link between a bottle and its cap?

a)

Indirect

b)

Removable

c)

Flexible

d)

Partial

37.

What type of guiding control is necessary to assure a good motion of the handle on this suitcase?

a)

There is no guiding control

b)

Translational guiding control

c)

Rotational guiding control

d)

Helical guiding control

38.

I am a material that softens enough when heated to be re-moulded. That makes me a recyclable plastic.

a)

Thermoplastic

b)

Thermosetting plastic

c)

Composite

d)

Fiberglass

39.

On this picture, which gear should be the driver in order to increase the speed in the system?

a)

The bigger orange gear

b)

The smaller blue gear

40.

Cam and follower

Which of the following statements is true about the cam and follower system.

a)

The cam and follower is a motion transmission system.

b)

The cam and follower system is reversible.

c)

In a cam and follower system, the driven moves in a translational motion.

d)

The shape and size of the cam doesn't affect the movement of the follower.

41.

Which constraint is shown on the picture?

a)

Compression

b)

Tension

c)

Torsion

d)

Deflection

42.

Which constraint is shown on the picture?

a)

Compression

b)

Tension

c)

Shearing

d)

Deflection

43.

When manufacturing a technical object, it is necessary to define the mechanical properties of different materials in order to make the most suitable choice.

Which mechanical property is sought in the following example?

Wooden flooring that resists indentation or scratching by pointed objects, such as shoe heels.

a)

Malleability

b)

Hardness

c)

Resilience

d)

Elasticity

44.

When manufacturing a technical object, it is necessary to define the mechanical properties of different materials in order to make the most suitable choice.

Which mechanical property is sought in the following example?

A material than bends easily, without breaking, to make gutters.

a)

Malleability

b)

Ductility

c)

Stiffness

d)

Elasticity

45.

Which category of material would you suggest to meet the following needs?

A durable material with low electrical conductivity and high degree of heat resistance and hardness.

a)

Wood

b)

Plastic

c)

Ceramic

d)

Composite

46.

Which category of material would you suggest to meet the following needs?

A material that combines the properties of several categories of materials.

a)

Wood

b)

Metal

c)

Plastic

d)

Composite

47.

Which of the following choices correctly defines the characteristics of the link between a tire and the metal frame (wheel)?

a)

Direct, removable, flexible, complete

b)

Direct, non removable, solid, complete

c)

Indirect, removable, flexible, partial

d)

Indirect, non removable, flexible, partial

48.

What is the most suitable power source for a flashlight?

a)

Power outlet

b)

Batteries

c)

Light bulb

d)

Switch

49.

Electrical wires are usually covered in plastic. Which electrical function is performed by the plastic casing?

a)

Conduction

b)

Transformation

c)

Insulation

d)

Control

50.

When a lamp is switched off, is the electrical circuit open or closed?

a)

Open

b)

Closed

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