True/False? "When the load is increased beyond the limit of proportionality, the diameter of the wire will increase "
False
15
True/False? "A metal wire is loaded up to the limit of proportionality. Hooke’s Law is obeyed when the load is increased from zero to this point"
True
15
True/False? "A metal wire is loaded up to the limit of proportionality. When the load is removed, the wire does not returns to its original length"
False
15
For the load of the spring that still obeys Hooke’s Law, if the load is made 2 times bigger, then what does the extension become?
2 times bigger
10
True/False? "Below limit of proportionality, Hooke's Law cannot be valid anymore"
False
15
True/False? "Hooke's Law can be used below limit of proportionality"
True
15
True/False? "Spring will break at limit of proportionality"
False
15
True/False? "Spring will not stretch at limit of proportionality"
False
15
On which labelled surface should the block rest to produce the smallest pressure on the bench?
P
15
The table gives four forces and the surface area on which each force acts. Which row gives the largest pressure on the surface?
B
15
Which energy change takes place in the microphone?
C
15
A woman of mass 32 kg has 64 J of kinetic energy. What is her speed?
2 m/s
15
A student listens to a mchine that makes sounds of different frequencies. He can only hear one of the sound. State the frequency of sound that can be heard by a student!
20 Hz - 20000 Hz
15
How do the frequency and pitch of P compare with the frequency and pitch of Q?
Frequency of P same as Q, Pitch of P same as Q
15
How do the loudness of P compare with loudness of Q?
Loudness of P higher than Q
15
Which sound is the louder and which has the lower pitch?