Science 7 - Demo

The following is a sampling of questions from our Science 7 testbank.

### Heat and Temperature

20.
If 100 grams of ice are melted, the mass of the water obtained would be
1. greater than 100 grams.
2. 100 grams.
3. less than 100 grams.
4. Impossible to determine since we do not know the temperature of the ice and water.
21.
A metal jar lid is stuck to the jar but will be easier to twist open after it has been held in hot water. The reason for this is that
1. water lubricates the glass and the metal slides over it more easily.
2. hot water reduces the inertia of the jar lid.
3. heat from the water causes the jar lid to expand.
4. hands do not slip easily on wet metal.
37.
Which of the following is a true statement?
1. The temperature of hot tea would be about 37oC.
2. All liquids expand at the same rate when heated.
3. Hot objects can sometimes be noticed with the sense of sight.
4. Anders Celsius was the first scientist to state a theory to explain the nature of heat.
63.
A student is carrying out an experiment that requires boiling some water. A beaker of the correct size is not available so he uses a glass preserve jar instead. What is unsafe about this procedure?
1. The glass jar is thinner so the water will boil very quickly.
2. The glass jar is not designed to heat quickly so it might crack.
3. The water will splash out of the glass jar and this could burn someone nearby.
4. The glass in the jar is more dense (stronger) and this could break the bulb on the thermometer if it comes in contact with the glass.

Use the following graph to answer questions # 24 - 26.

The graph was made as temperature of a substance was recorded during a specific time span.

24.
Which of the following processes would have been happening to the substance as the above recordings were made?
1. contraction
2. expansion
3. evaporation
4. boiling

### Structure and Design

8.
A dog is tied up and pulling at its leash. How much pulling the leash can withstand before tearing is its
1. stress limit.
3. compressive strength.
4. tensile strength.
9.
In order to fully understand why an object is put together or built in a certain way one must
1. know what its purpose is.
2. know what object it resembles in nature.
3. analyse it to determine its weak spots.
4. make a drawing of its parts and see how the parts fit together.

Use the following diagram to answer questions # 17 - 22.

17.
Structure B which is supported only at one end is called a
1. cantilever.
2. sign support.
3. pillar.
4. girder.
24.
Which of the following is a true statement about structures and functions?
1. Although there are many complex structures, there has not been a large increase in the number of functions they perform.
2. How a structure looks is considered its function.
3. Developing and designing new structures is most simply done without paying attention to their functions.
4. In society generally there are more functions than structures to carry out these functions.
5.
Which of the following is not included in the description of a well designed structure.
1. The structure must perform the function it is designed for.
2. The structure must resist the stresses placed against it.
3. The structure must be built of the most suitable material at the most economical cost.
4. The colour of the structure must be pleasing to the eye and must blend well with the environment in which the structure is placed.

### Microorganisms

Use the following information to answer questions # 22 - 26.

22.
At which location in the food chain might one find diatoms?
1. L
2. M or N
3. O
4. P
23.
At which position might one find a second level consumer?
1. M
2. N
3. O
4. P
31.
Apple scab disease can be prevented by using a chemical called a/an
1. fungicide.
3. sugar or salt.
4. citric acid.

Use the following information to answer questions. # 36 - 45.

A student decides to carry out an experiment to find out if how long hands are rubbed with warm water and hand soap has an effect on the growth of bacteria. She gets one brand of soap and prepares four petri dishes for growing the bacteria. Four volunteers help by washing their hands with the soap for different amounts of time; one, two, three, and four minutes. After washing, they gently press the tips of their fingers into the material in the petri dishes. The dishes are examined after 24 hours and after 48 hours.

36.
The manipulated variable in this experiment is
1. the brand of hand soap used.
2. how long the hands of each volunteer were washed.
3. the 24 or 48 hours for which the bacteria were allowed to grow.
4. the number of bacteria that grow in each test.
37.
A common material which is used in petri dishes to grow bacteria is
1. any sample of decaying food.
2. a sugar solution.
4. agar.

### Living Things

15.
A student did four pulse counts and got the four following rates as the number of beats per minute, 62, 68, 65, 73. What was the student's average pulse rate?
1. 65
2. 67
3. 69
4. 73
16.
A body of a dead organism will still have some characteristics the organism had when it was alive.
1. true
2. false
26.
Before a human's body can produce a response to a stimulus, which of the following actions must take place?
1. The receptors must get ready to carry out the response.
2. Breathing rate must increase.
3. The brain must interpret the stimulus.
4. Sense organs must adjust their reaction rates.
41.
A student sitting in a desk hears a fire alarm. The amount of time between hearing the alarm and getting out of the desk and walking out is called
1. a nervous reaction.
2. environmental stress.
3. survival time.
4. reaction time.
56.
Many animals, shortly after birth, have the ability to learn certain behaviours. One of the most common ways in which they learn is by
1. imitating their parents.
2. trying something and seeing if it works.
3. listening to the sounds that other animals make.
4. practising life skills as they play.

### Forces & Motion

9.
Which of the following is true about an object in motion?
1. Equal forces are acting on both sides of the object.
2. The force of friction is greater than the force of inertia.
3. Unbalanced forces are acting on the object.
4. The speed of the object is dependent only on the amount of force applied to it.
14.
Rockets blasting away from Earth follow a
1. straight path as they leave the atmosphere.
2. curved path due to friction of the Earth's atmosphere.
3. curved path due to the force of gravity from Earth.
4. curved path due to rotation of the Earth.
15.
Which of the following describes the conditions which will allow an object to float on water?
1. force of buoyancy is greater than force of gravity
2. force of buoyancy is less than force of gravity
3. the object's mass is not being affected by the force of gravity
4. the object's mass is not being affected by the force of buoyancy
22.
The amount of braking distance required for a semi-trailer truck as compared to that of a compact car demonstrates the concept of
1. for every action there is an equal and opposite reaction.
2. inertia.
3. gravity.
4. friction.
23.
Sounds can be created on audio cassette tapes because of the forces of
1. electromagnetism.
2. friction.
3. inertia.
4. heavy metal.

### Earth's Surface

31.
Students taking a short cut to school are gradually wearing out a path across the school yard. What two characteristics best describe this path?
1. rapid geological change and chemical weathering
2. rapid geological change and mechanical weathering
3. slow geological change and mechanical weathering
4. slow geological change and chemical weathering
32.
A student is asked to demonstrate the process of chemical weathering. Which of the following combinations of materials could best be used to carry out this demonstration?
1. a block of ice and some salt
2. gravel and flowing water
3. a drinking straw pushed into wet sand
4. chalk and acid
3.
In a receding glacier
1. melt back is less than ice flow.
2. melt back is greater than ice flow.
3. melt back is equal to ice flow.
4. the position of the leading edge of the glacier changes very little from year to year.
44.
Continental glaciers get their name from the fact that every continent in the world has at least part of its land mass covered by these large sheets of ice.
1. true
2. false
67.
In a science report, a student made the following statement. "Natural catastrophes such as avalanches, volcanoes, and earthquakes cause many people hardship and are the major causes of changes on the Earth's surface." Which of the following best describes the accuracy of this statement?
1. The statement is accurate.
2. The statement is inaccurate because the three events described are not natural.
3. The statement is inaccurate because the three events usually occur in regions where people do not live so the amount of hardship is very small.
4. The statement is inaccurate because the three events mentioned are not the major causes of changes in the Earth's crust.

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