Given 4 tuning forks of frequency 446, 440, 443, and 449 Hz, how many different beat frequencies ...

Given 4 tuning forks of frequency 446, 440, 443, and 449 Hz, how many different beat frequencies could be produced and what are they?
 
  What will be an ideal response?

Question 2

The mass of a mass-and-spring system is displaced 10 cm from its equilibrium position and released. A frequency of 4 Hz is observed. What frequency would be observed if the mass had been displaced only 5 cm and then released?
 
  A) 8 Hz
  B) 4 Hz
  C) 6 Hz
  D) 2 Hz

Question 3

Consider point charges of +Q and +4Q, which are separated by 3 m. At what point, on a line between the two charges, would it be possible to place a charge of -Q such that the electrostatic force acting on it would be zero?
 
  A) 3/5 m from the +Q charge
  B) 1 m from the +Q charge
  C) 1 m from the +4 charge
  D) 3 m from the +4 charge
  E) There is no such point possible.

Question 4

A heavy bus bar is 20. cm long and of rectangular cross-section, 1.0 cm  2.0 cm. What is the voltage drop along its length when it carries 4000. A? (The resistivity of copper is 1.69  10-8 -m.)
 
  What will be an ideal response?

Question 5

The fact that Encephalization Quotients (EQs) of organisms have generally increased with time provides evidence for
 
  A) cross-breeding between organisms
  B) artificial selection
  C) genetic mutations
  D) convergent evolution toward intelligence

Question 6

In which eon of Earth's history did life originate?
 
  A) Proterozoic
  B) Phanerozoic
  C) Archean
  D) Hadean