2018 2nd Semester Exam - 7th Grade

In an atom, protons equal

• electrons

• neutrons

• valence electrons

• nucleus

A substance that prevents the flow of electrons is called

• circuit

• conductors

• insulator

• metal

What is not a conductor?

• copper

• steel

• aluminum

• rubber

Elements in a column on the periodic table all have similiar

• properties

• names

What are two ways to increase the strength of an electromagnet?

• Increase number of coil on core

• smaller core

• increase batteries/voltage

• move the coils farther apart

The ends of a magnet are called

• ends

• poles

• equator

Magnets and currents are similar because electrons go in the same direction in both.

• True

• False

This is the symbol for ...

• light dependent resistor
• Variable Inductor (coil )
• Light Emitting Diode
  ( LED ) 
• transistor

This is the symbol for ...

• fixed resistor
• Light Dependent Resistor ( LDR )
• variable resistor
• photo switch

Enables the current in a circuit to be switched on/off.

• battery
• diode
• switch
• resistor