Diagnostic Test Science 6 (3rd Quarter)

Why do things thrown upward fall down?

• gravity ran out

• friction causes them to fall

• gravity make things fall

• the kinetic energy of things are used up

What class of lever is a crowbar?

• first

• second

• third

• fourth

Why are there no machines with an efficiency of 100%?

• machines are not durable

• machines tend to deteriorate over time

• machines are not capable of handling heavy jobs

• machines are affected by external forces such as friction

How is mass related to gravity?

• If you double the mass of an object, its gravitational force is tripled

• If you double the mass of an object, its gravitational force is halved

• If you double the mass of an object, its gravitational force is doubled

• If you double the mass of an object, its gravitational force is increased by 1.5 times

Which of the following is a safety precaution when using a machine?

• running on ramps

• holding a knife upwards

• holding on the hand rails of a ramp

• using a sharp object without adult supervision

Which of the following converts energy from a waterfall into electrical energy?

• geothermal power plant

• hydrothermal power plant

• nuclear power plant

• solar power plant

How ill you describe a compound machine?

• a combination of two simple machine

• a combination of more than three machine

• two separate machines that operate separately

• three separate machines that operate separately

How does a percussion instrument produce a sound?

• by containing their vibrations

• by passing the vibrations to the air

• by absorbing vibrations from the air

• none of the above

Which of the following materials convert electricity to light energy?

• fan

• refrigerator

• incandescent bulb

• all of these

How is the mechanical advantage of a machine computed?

• by dividing the input force by the output force

• by dividing the output force by the input force

• by multiplying the input force by the output force

• by multiplying the output force by the input force