Elements Physics Flashcards
In Physics, If Lf and Lv are the latent heat of fusion and vaporization, the amount of energy needed to freeze a liquid?
A. Q=-mLf
_______ is the quality of being physically elongated
D. Plasticity
When the total kinetic energy of system is the same as before and after collision of two bodies, it is called
C. Elastic collision
Momentum is a property related to the object’s
A. motion and mass
The amount of heat needed to change solid to liquid is
B. latent heat of fusion
The energy stored in a stretched elastic material such as a spring is
B. elastic potential energy
According to this law, “The force between two charges varies directly as the magnitude of each charge and inversely as the square of the distance between them”.
B. Coulomb’s Law
A free-falling body is a body in rectilinear motion and with constant _____
A. acceleration
Centrifugal force _______
B. directly proportional to the square of the tangential velocity
The fluid pressure is the same in all directions. This is known as
A. Pascal’s Principle
The reciprocal of bulk modulus of any fluid is called
D. volume strain
Momentum Is the product of mass and
B. velocity
One horsepower is equivalent to
A. 746 watts
What Is the latent heat fusion required to turn ice to liquid?
C.334 kJ.kg
What is the value of the work done for a closed reversible, isometric system?
D. Zero
The sum of the pressure head, elevation head and the velocity head remain constant. This ls known as
C. Bernoulli’s theorem
A leak from a faucet comes out in separate drops. Which of the following is the main cause of this phenomenon?
A. Surface tension
Absolute viscosity is essentially independent of pressure and is primarily dependent on
A. temperature
In describes the luminous flux incidence per unit area and is expressed in lumens per square meter.
A. Illuminance
Linear momentum is the product of mass and velocity and this can be expressed also as a function of
C. Force, Time
When two waves of the same frequency, speed and amplitude traveling in opposite directions are superimposed
D. destructive interference always results
The transmission of heat from one place to another by fluid circulation between the spots of different temperature is called
A. convection
It is the measure of randomness of the molecules of a substance.
A. Entropy
The amount of heat needed to raise the temperature of one-pound of that substance one degree Fahrenheit is
B. BTU