Revision Quiz 2nd year

What is meant by an inelastic collision?

• A collision in which kinetic energy is conserved

• A collision in which kinetic energy is not conserved

• A collision where objects do not touch

• A collision in which momentum is not conserved

State Newton’s 1st law.

• For every action, there is an equal and opposite reaction

• The rate of change of momentum is proportional to the applied force

• An object will remain at rest or in uniform motion in a straight line unless acted upon by an external force

• Energy cannot be created or destroyed

What is the symbol for electromotive force (emf)?

What happens to a light wave when it passes from air into glass?

• Its speed increases and it bends away from the normal

• Its speed decreases and it bends towards the normal

• Its speed remains the same and it continues in a straight line

• Its frequency decreases

What is meant by the critical angle?

• The angle at which light is refracted at 90° to the normal

• The angle at which light is reflected back into the medium

• The angle at which total internal reflection occurs

• The angle at which light passes straight through a surface

How many nodes are present in the 2nd harmonic of a stationary wave in a closed end tube?

• 1

• 2

• 3

• 4

State Kirchoff’s 2nd law.

• The total current entering a junction equals the total current leaving

• The sum of the emfs in any closed loop is equal to the sum of the potential differences in that loop

• The resistance in a circuit is constant

• The power supplied equals the power dissipated

Which of the following are the two conditions needed for a system to be in simple harmonic motion?

• The acceleration is proportional to displacement and directed away from the equilibrium position

• The acceleration is proportional to displacement and directed towards the equilibrium position

• The velocity is constant and the force is zero

• The displacement is always zero and the force is constant