Quiz -Test Your Self | Physical Sciences | GRD 12 | June 2018

The net (resultant) force acting on an object is equal to the … of the object in the direction of the net force.

A  change in momentum
B  change in kinetic energy
C  rate of change of momentum
D rate of change of kinetic energy

A physical quantity that is described as a measure of the resistance of a body to a change in motion is called …

A  inertia.
B  force.
C  acceleration.
D  weight.

The diagram below shows a section of the path of a stone projected vertically upwards.

At which ONE of the positions indicated on the diagram will the magnitude of the momentum of the stone be the GREATEST? Ignore air resistance.
A  I
B  II
C  III
D  IV

Two cars, P and Q, moving in a straight line, have the same momentum. The kinetic energy of Q is greater than the kinetic energy of P.
Which ONE of the following statements regarding the cars is CORRECT?

A  Q has a smaller mass than P.
B  Q has the same mass as P.
C  Q is moving slower than P.
D  Q is moving at the same speed as P

The net work done on an object to increase its speed from rest to v is W. How much network must be done on the same object to increase its speed from v to 2v?

A  W
B  2W
C  3W
D  4W

Which ONE of the following is NOT an application of the Doppler effect?

A  A light meter
B  A blood flow meter
C  Detecting the heartbeat of a foetus using ultrasound
D  Measuring the speed of an approaching car using radar

In the circuit below the battery has an emf (ε) and internal resistance r. With switch S open, readings are registered on the ammeter and voltmeter.

A learner lists the following as factors that affect the magnitude of the current induced in an AC generator:
(i)    The number of turns (windings) of the coil
(ii)  The strength of the magnetic field
(iii)  The speed of rotation of the coil

Which ONE of the combinations below is CORRECT?
A  (i) and (ii) only 
B  (i) and (iii) only
C  (ii) and (iii) only
D (i), (ii) and (iii)