iGCSE Physics Explanation Type Qs DCSG

Initially the weight is the only ​ (a)   acting and the object ​ (b)   downwards. As the speed of the object increases so does ​ (c)   or drag force on it, more frequent collisions with air particles. Eventually the drag and weight are the same and so the ​ (d)   force is zero and the acceleration is zero, thus we reach terminal ​ (e)   .

• force
• accelerates
• air resistance
• resultant
• velocity

A live wire can become loose and touch the ​ (a)   skin of a device. If the live wire does touch the metal surface then a large ​ (b)   will flow down the ​ (c)   wire. The earth wire is a very low ​ (d)   route to ground. This is called ​ (e)   .

• metal
• current
• earth
• resistance
• earthing

When a fluid is heated it will ​ (a)   , particles move further apart, thus reducing ​ (b)   . The less dense fluid will ​ (c)   , being replaced by the cooler more dense fluid. As the fluid rises, it will cool down, ​ (d)   density and then fall. This movement on fluid to transfer heat is called a ​ (e)   current.

• expand
• density
• rise
• increase
• convection

How to use two ​ (a)   magnets to produce a uniform magnetic field;

·     Firstly, a uniform field is one which has the same ​ (b)   at all points in the field.

·     The field pattern has ​ (c)   lines whose distance apart does not change.

·     We can make uniform filed by putting the ​ (d)   poles of two magnets close together and slowly moving them apart till their magnetic filed lines are ​ (e)   (parallel)

• permanent
• strength
• parallel
• opposite
• uniform

A neutron can hit the nucleus of a ​ (a)   atom and cause it to split up. The Uranium nucleus will split up into smaller nuclei and will also emit ​ (b)   . A Chain Reaction is when these neutrons may go on to strike other uranium ​ (c)   and cause further ​ (d)   releasing more neutrons.

• uranium
• neutrons
• nuclei
• reactions

Electromagnetic ​ (a)   occurs when a wire cuts through ​ (b)   field lines or vice verse. A ​ (c)   is induced across the wire. The wire is connected to a circuit then ​ (d)   will flow.

• Induction
• magnetic
• voltage
• current

Pressure exerted by a gas increases as the gas is heated, because the ​ (a)   is increased the particles move faster and the particles have more ​ (b)   energy meaning there will be more ​ (c)   , and each collision will exert more ​ (d)   over an area, thus the ​ (e)   increases.

• temperature
• kinetic
• collisions
• force
• pressure

​ (a)   between longitudinal and transverse waves; In a transverse wave the oscillations of the particles are at 90° or ​ (b)   to the direction in which the wave ​ (c)   is transferring. In a longitudinal wave the oscillations of the particles are ​ (d)   to the direction in which the wave energy is ​ (e)   .

• Distinguish
• perpendicular
• energy
• parallel
• transferring

A ​ (a)   works by an alternating current in the primary creates an alternating ​ (b)   field in the ​ (c)   core, this creates an alternating magnetic field, which passes through the ​ (d)   and cuts through the secondary coil.

This alternating field cutting through the ​ (e)   coil induces an alternating voltage in the secondary coil.

• Transformer
• magnetic
• iron
• core
• secondary

Explain how ​ (a)   features in a car, in terms of momentum, work. During the crash the momentum of the passenger is reduced to ​ (b)   , seatbelt increases the ​ (c)   for this change in momentum to happen and thus, reduces the ​ (d)   and risk of serious injury. The ​ (e)   zone of a car also increases the time taken for the change in momentum to occur, this again reduces force on the passenger.

• safety
• zero
• time
• force
• crumple