Physics Past Questions and Answers

A body of mass M₁ moving with a velocity U collides with a stationary body of mass M₂ and both move with a common velocity V. If linear momentum is conserved, which expression correctly represents V?

A M₁ + M₂ ÷ M₁U
B M₂U ÷ M₁ – M₂
C M₁U ÷ M₁ – M₂
D M₁U ÷ M₁+ M₂
E M₂U ÷ M₁ + M₂

Question 107:

According to the Kinetic Theory, what does NOT occur when the temperature of a constant volume of gas is increased?

A A decrease in the mean speed kinetic energy of the molecules
B An increase in the mean speed of the molecules
C An increase in the momentum change at each collision.
D An increase in the number of collisions per second
E An increase in the pressure exerted by the gas.

Question 108:

The wavelength of a stationary wave is 36.0cm. What is the distance between a node and the next anti-node?

A 6.0cm
B 9.0cm
C 18.0cm
D 360cm
E 72.0cm

Question 109:

An a.c. generator can be converted into a d.c. generator by replacing ____________

A The slip rings with split-ring commutators
B The slip rings with armatures
C The split-rings with slip rings
D The split-rings with brushes
E The brushes with slip-ring commutators.

Question 110:

It is NOT possible to determine exactly and simultaneously the position and momentum of a particle. This statement is known as the ____________

A Crompton effect
B De Broglie’s laws
C Frank-Hertz experimental law
D Heisenberg’s uncertainly principle
E Wave-particle paradox