Teori Fisika 19 November 2020

Which statement is correct?

• Mass is a force, measured in kilograms.

• Mass is a force, measured in newtons.

• Weight is a force, measured in kilograms.

• Weight is a force, measured in newtons.

What apparatus is needed to determine the density of a regularly-shaped block?

• a balance and a ruler

• a balance and a forcemeter (spring balance)

• a measuring cylinder and a ruler

• a measuring cylinder and a beaker

What causes refraction when light travels from air into glass?

• The amplitude of the light waves changes.

• The colour of the light changes.

• The frequency of the light waves changes.

• The speed of the light changes.

An atom of lithium contains three protons and three electrons. The nucleon number (mass number) of the atom is 7. How many neutrons are there in the atom?

• 3

• 4

• 7

• 10

Which types of radiation can be stopped by a sheet of paper?

• alpha particles

• beta particles

• gamma rays

• X rays

Which statement is correct about the speed of electromagnetic waves in a vacuum?

• Ultraviolet waves have the greatest speed.

• Visible light waves have the greatest speed.

• Infrared waves have the greatest speed.

• All electromagnetic waves have the same speed.

A student wishes to use a magnetising coil to make a permanent magnet from a piece of metal. Which metal should she use?

• aluminium

• copper

• iron

• steel

Which change will lower the pitch of a sound?

• decreasing its amplitude

• decreasing its frequency

• increasing its amplitude

• increasing its frequency

A 3.0 ohm lamp and a 6.0 ohm lamp are connected in series. What is the total resistance of the combination?

• 0.5 ohm

• 2.0 ohm

• 9.0 ohm

• 18.0 ohm

A large electric motor is used to lift a container off a ship. Which of the following values are enough to allow the power of the motor to be calculated?

• the mass of the container and the distance moved

• the force used and the distance moved

• the current used and the work done

• the work done and the time taken