(A) total internal reflection

(B) refraction

(C) diffraction

(D) reflection and refraction

A) the surface of ice is smooth

B) ice is cold

C) the pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water

D) the pressure on the ice due to skate raises its melting point

(A) Reflection of light & Refraction of light

(B) Dispersion of light

(C) Total Internal Reflection

(D) Refraction of light & Total Internal Reflection of light

(A) do not produce noise during the operation

(B) are easy to produce

(C) can produce perfectly homogeneous solutions

(D) do not produce chemical reactions in the solution

(A)  maybe more or less than the true weight

(B) more than the true weight

(C) less than the true weight

(D) equal to the true weight

(A) stone chips

(B) steel

(C) glass_wool

(D) glass pieces

(A) will increase

(B)  will decrease

(C) dose not change

(D) varies with the increase of depth of the immersion of their piece

(A) kinetic energy

(B) weight

(C) potential energy

(D) impulse

(A) surface tension

(B) capillarity

(C) viscosity

(D) diffusion

(A) scattering

(B) interference

(C) total internal reflecction

(D) refraction