Science Vol. B Mid Term Review

Science Vol. B

Mid Term Review

By Saiful Milah

Pressure

Pressure is the amount of force acting perpendicularly on a unit area.

Pressure = Force / Area​

Science | Vol. B

Mid Term Review

Multiple Choice

Sally is attaching a pin badge to the collar of her school uniform. Which property of the badge allows Sally attach the badge easily?

• The length of the pin

• The hardness of the pin

• The small area on the tip of the pin

• The length area of the badge

Multiple Select

Which activity below does rely on atmospheric pressure?

• Breathing air into lungs

• Opening a cabinet door

• Attaching suction-cup holders onto a wall

• Sucking a liquid up a drinking straw

Energy and Work Done

Energy is ability to do work

​The SI unit for energy and work done is the Joule (J)

In order for ​work to be done on a object, two condition must be met:

1. A forces acts on an object

2. The object moves in the same direction as the force​

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Science | Vol. B

Mid Term Review

Multiple Select

Which of the actions below is example of work done?

• Closing an umbrella

• Opening a chest of drawers

• Pumping air into a bicycle tyre

• Holding a bowling ball at chest level

Energy Changes

Energy can be converted from one from to another, but it cannot be created or destroyed

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Science | Vol. B

Mid Term Review

Multiple Choice

Isaac throws a basketball into the air. At some point in the air, the basketball has 50 J of kinetic energy and 50 J of potential energy.

How much total energy does the basketball have when:

(i) it has just left Isaac's hand; (ii) it is about to touch the ground?

(Assume that the effect of the basketball's friction with the air can be ignored.)

• (i) 100 J; (ii) 100 J

• (i) 50 J; (ii) 50 J

• (i) 50 J; (ii) 0 J

• (i) 0 J; (ii) 50 J

Multiple Select

Isaac throws a basketball into the air. At some point in the air, the basketball has 50 J of kinetic energy and 50 J of potential energy.

Which of the following statement(s) about the basketball is/are true?

• The basketball has maximum speed when it reaches its maximum height

• The basketball has maximum kinetic energy just after it leaves Isaac's hand

• The kinetic energy of the basketball is always equal to its potential energy

Multiple Select

Which of the following does lead to a conversion of energy?

• Lifting a stack of books off a table

• Pulling on a rope tied to a tree

• Pushing a loaded wheelbarrow up a slope

• Pushing oneself away from the wall of a swimming pool

Sources of Energy

Science Vol. B Mid-Term Review

Biofuels

Geothermal

Hydroelectric

Solar

Wind​

Renewable

Fossil Fuels

Non-Renewable

Multiple Select

In which of the following sources of energy is heat transfer used in producing energy?

• Biofuel

• Geothermal energy

• Fossil fuel

• Solar energy (photovoltaic)

Sound

The molecules of vibrating object possess energy, which is passed on to the surrounding molecules. This energy is transmitted as sound energy.

Sound cannot travel in vacuum.

The speed of sound varies with the type of medium and the state of the medium​

Science | Vol. B

Mid Term Review

Multiple Choice

How is sound carried away from its source?

• By vibrations transferred from one molecule to the next

• By molecules moving away from the source at 300 m/s

• By waves moving out in the spaces between molecules

• By ropes shaking up and down to form rippling waves

Human Ear

Sound is carried along the ear canal to the eardrum that vibrates in response to the sound.

Science | Vol. B

Mid Term Review

Multiple Choice

Which parts of the ear vibrate when sound is heard?

• Eardrum and ear canal

• External ear and ear cana

• Ear bones and eardrum

• Ear bones and ear canal

Pitch, Frequency, Loudness

The loudness of sound depends on the size of vibrations.

The pitch of sound depends on its frequency

The frequency of sound refers to the number of cycles pe second made by the vibrating source of sound​

Science | Vol. B

Mid Term Review

Multiple Choice

In an experiment, some grains of sand were placed on a speaker. The volume of the music coming from the speaker was increased gradually. The grains of sand on the speaker jumped about more vigorously. This means that _________

• the loudness of the sound had increased

• the pitch of the sound had increased

• the quality of the sound had decreased

• the speed of sound had decreased

Sound and Society

We use sound in several ways - for communication, entertainment, as warning of danger, and sonar.​

Noise is a collection of notes that is unpleasant and possibly harmful​

Science | Vol. B

Mid Term Review

Multiple Select

Which event is one where sound is useful?

• At a conference, for giving speeches to the participants

• At an orchestra concert in a large hall to the audience

• At home with the family watching the World Cup on TV

• At a coffee shop near roadworks with a pneumatic drill in use