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
What is the gage used to measure 0.001 to 1 atm pressure?
C. Mercury manometer
One of the types of non-material nuclear radiations
D. Gamma radiation
A flower pot falls of a ledge of a 5th floor window, just as it passes the window. Which of the following is true?
C. The flower pot hits the ground first and with a higher speed that the glass.
Whenever a net force acts on a body, it produces an acceleration in proportional to the resultant force and inversely proportional to the mass of the body. This theory is popularly known as
C. Newton’s Second Law of Motion
Any two points along a streamline in an ideal fluid in steady state the kinetic energy per unit volume has the same value. This concept is known as the:
B. Bernoulli’s Energy Theorem
In elastic collision is a collision in which the total kinetic energy after the collision is ______ before collision.
C. less than
The property by virtue of which a body tends to return to its original size of shape after a deformation and when the deformation forces have been removed.
A. Elasticity
When two waves of the same frequency, speed and the amplitude traveling in opposite directions superimposed,
A. destructive Interference always results
What is the name of a vector that represents the sum of two vectors?
C. resultant
The standard acceleration due to gravity is
A. 32.2 ft/s2
Ivory soap floats in water because
D. the specific gravity of ivory soap is less than that of water
One gram of ice at 0℃ is place on a container containing 2,000,000 cubic meters of water at 0°C. Assuming no great loss, what will happen?
C. the volume of ice will not change
Melting point of ice is
B. 273K
The standard meter is defined as ____ wavelengths in vacuum of the orange-red line of the spectrum of krypton 86.
B. 1,650,763.73
Originally defined as the fraction 1/86400 of the mean solar day and now defined as the duration of 9,192,631,770 periods of the radiation of a certain state of the cesium-133 atom.
A. Second
The ratio of the density of the substance to the density of water.
C. Specific gravity
The ______ of a substance is its density relative to that of pure water.
C. specific gravity
What is another name for specific gravity?
B. Relative density
What is the specific gravity of water?
A. 1.0
What is another term for density?
B. Specific weight
Which of the following is NOT a density of water?
D. 64.2 lb/ft3
What is the specific gravity of mercury?
D.13.6
Absolute zero temperature is
D. 0°K
At what temperature readings do the Fahrenheit and Celsius have the same value?
C.-40°
Densed conditon of water is at what temperature?
C.4℃
Indicate the FALSE statement about temperature.
D. Absolute zero in Fahrenheit scale is-273°
Standard atmospheric pressure.
D.760 mm of Hg
Absolute pressure equals
C. gauge pressure + atmospheric pressure
The difference between the absolute pressure and the atmospheric pressure is called
A. gauge pressure
Under normal condition, the gauge pressure at water surface is
B. equal to zero
An instrument used to measure air pressure is the
B. barometer
The atmospheric pressure at mean sea level is known as the
B. 14.7
“At constant pressure, the volume is directly proportional to temperature”. This is known as
B. Charles’ Law
“At constant temperature, the volume is inversely proportional to the pressure.” This is known as
A. Boyle’s Law
All are scalar quantities except
A. acceleration
All are vector quantities except
D. mass
A vector is a straight-line segment that has a definite
E. length, direction and sense
The scalar product of two vectors is sometimes known as
A. dot product
Which of the following is incorrect?
B. All scalar quantities have directions.
The _______ of two vectors is obtained by adding one vector to the negative of the other.
D. difference
The distance per unit time.
A. Speed
The displacement per unit time.
B. Velocity
Defined as the gravitational force exerted on an object because of its attraction to some other masses such as the earth.
A. Weight
Defined quantitatively as the amount of matter of which the object is made. It also refers to the measure of the object’s inertia
B. Mass
Which of the following statements is TRUE?
D. The weight of a body depends on its location while the mass is independent of its location.
Which of the following is true about the weight of an object?
A. It is the force with which it is attracted to the earth.
A measure of inertia of a body, which is its resistance to a change in velocity.
B. Mass
A quantitative measure of inertia
B. Mass
Indicate the FALSE statement.
D. Weight of the body is always equal to its mass
A cart loaded with gravel is hard to get started rolling because of lts large
A. mass
The mass to which a force of one pound will give an acceleration of one foot per second per second.
A. Slug
The tendency of any object to remain at rest or to continue in motion is called
B. inertia
Any influence capable of producing change in the motion of an object is called
A. Force
Which of the following is NOT a unit of force?
B. Erg
The unit of force which is equivalent to 1 gram-cm/sec?
C. Dyne
The product of force and displacement is called
D. work
Which of the following is NOT a unit or work?
D. Slug
What is the SI unit of work?
A. Joule
The work done by the external force on particles is equal to the ____ of the particle.
C. change in kinetic energy
The work done by all forces except the gravitational force is always equal to the _____ of the system.
C. total mechanical energy
There is no work done when
B. the force is perpendicular to the displacement
The work done by a force of 1 newton acting through a distance of 1m is known as
C. joule
The work done in lifting an object of mass “m” to a height “h” is
B. mgh
Indicate the false statement about work.
C. The unit of work in the SI system is joules and erg in the English system
The force due to gravity does not work on objects that
C. is moved parallel to the surface of the earth
The rate of doing work.
C. Power
What is the SI unit of power?
E. watt
All are units of power except
D. joules
Joules is an SI unit of
A. work
Why it is that the power delivered by any machine is always less than the power supplies to it?
D. due to the presence of friction
The capacity to do work is called
B. energy
Kinetic energy equals
D. 1/2 mass x velocity^2
An energy by virtue of the object’s motion is called
D. kinetic energy
An energy by the virtue of the object’s position of elevation is called
B. potential energy
An energy by the virtue of the object’s mass is called
A. rest energy
The energy of an object due to its vertical separation from the earth’s surface.
C. Gravitational potential energy
The energy stored in a stretched or compressed elastic material such as a spring is called
B. elastic potential energy
The kinetic energy of the atoms and molecules due to their random motion is called
A. thermal energy
The change in gravitational potential energy depends on the ____ of the object.
A. initial and final vertical position
Kinetic means that it is
A. in motion
What will happen to the kinetic energy of the body if its velocity doubled?
B. Quadrupled
Thermal energy refers to the random kinetic energy of all__in a substance.
D. atoms and molecules
A vector quantity which is a product of mass and velocity of the body
A. Momentum
The product of a force and the time during which it acts is known as
B. impulse
Momentum is the product of mass and
B. velocity
Change of momentum is equal to
B. impulse
What is the SI unit of impulse?
A. N-s
What is the Si unit of momentum?
A. N-s
If the velocity of the body doubled in value, its ___ will also doubled.
C. momentum
The negative ration of the relative velocity after a collision to a relative velocity before a collision.
D. Coefficient of restitution
A collision in which the total kinetic energy after collision is less than that before collision
B. Inelastic collision
When the colliding bodies stick together on impact which results in the maximum possible loss in kinetic energy, it is said to be __ collision.
C. completely inelastic
Which of the following is true about collision?
A. In elastic collision, no kinetic energy is lost.
At what situation when the colliding objects stops and the target moves off with the same speed after collision?
A. When their masses are equal to the target is stationary.
If the colliding object has a mass less than that of the stationary target, after impact, the;
D. the lighter object bounces off the heavier one
If the colliding object has a mass greater than that of the stationary target, after impact the
B. colliding objects continue its motion in the same direction with reduced speed
For perfect elastic collision, the coefficient of restitution, e, is equal
B. 1
For perfect inelastic collision, the coefficient of restitution,e.is equal to
A. 0
In an elastic collision,
A. the kinetic energy is conserved
“For every action, there is always an equal and opposite reaction. This is known as
C. Newton’s third law
Every body continues in its state of rest or at constant speed in a straight line motion, it is compelled to change that state because of forces acting on it. This is known as
A. Newton’s first law
An unbalanced force acting on an object will cause the object to accelerate in the direction of the force. This is known as
B. Newton’s second law
Newton’s second law of motion states that the rate of change of momentum with respect to time is
A. force
The accurate formulation of the laws of motions, as well as of gravitational was made by
D. Newton
The law which describes the motion of stars, planets and comets.
C. Kepler’s laws
Which of the following does not describe the object as observed from earth?
D. Focus
If an external pressure is applied in a confined fluid, the pressure will be increased at every point in the fluid by the amount of external pressure. This is known as
B. Pascal’s law
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
“At any two points along a streamline in an ideal fluid in a steady flow, the sum of the pressure, the potential energy per unit volume and the kinetic energy per unit volume has the same value”. This concept is known as
B. Bernoulli’s theorem
Whenever a net force acts on a body, it produces an acceleration in the direction of the resultant force, an acceleration that is directly proportional to the mass of the body. This theory is popularly known as
B. Newton’s Second Law of Motion
A measure of the resistance of a body it offers to any changes in its angular velocity, determined by its mass and distribution of its mass about the axis of rotation is known as
D. angular acceleration
In the equation E=mc^2, c is
C. speed of light
The range of a projectile depends on
C. Initial velocity and angle of projection
In a trajectory, air resistance decreases
D. all of the above
In the absence of air resistance, a projectile sent off at an angle of θ above the horizontal range of
A.R=(V^2/g)sin2θ
In the preceding question, the time of flight is
D.t=(2V sinθ)/g
The trajectory of a projectile is a graph of
B. parabola
If an object is thrown vertically upward, its acceleration
B. is equal to that of an object thrown vertically downward
The acceleration is_____the RESULTANT FORCE on the object.
A. directly proportional to
The acceleration is____the MASS of the object.
B. inversely proportional to
Refers to the vertical speed at which the force of air resistance is just sufficient to balance the body’s weight
B. Terminal speed
Objects falling in air from the same height will not reach the ground at the same time because:
D. all of the above
A point on the object from which it can be suspended in any orientation without tending to rotate.
D. All of the above
What is another term for centroid?
D. All of the above
Centrifugal force is directly proportional to
A. the square of the tangential velocity
The amount of heat required to change the temperature of 1 pound of water 1°F.
D. British Thermal Unit (BTU)
Calorie is defined as the amount of heat required to raise a temperature of __ of water 1℃.
A. 1 gram
The amount of heat needed to change the temperature of a unit quantity of it by 1°
D. Specific heat capacity
What is specific heat?
B. The heat needed to raise the temperature of 1 pound of water1°F
What is the specific heat capacity of water in kJ/kg ℃?
A. 4.19
The amount of heat must be supplied to change 1 kg of the substance at its boiling point from the liquid state to the gaseous state.
B. Heat of evaporation
The amount of heat that must be supplied to change 1kg of the substance at its melting point from the solid to the liquid state.
A. Heat of fusion
“Any body immersed in a fluld is subjected to a buoyant force which is equal to the weight of the fluid displaced”. This is known as
C. Archimedes principle
The total hydrostatic force on plane area is directly proportional to
A. density of fluid
Buoyant force is equal to
C. density of fluid x volume submerged
Refers to the tendency of the liquid surface to contact to the minimum possible area in any situation.
C. Surface tension
Refers to the measure of the fluid’s internal friction
B. Viscosity
The____of a machine equals to the ratio between its actual and its theoretical mechanical advantage.
C. efficiency
Actual mechanical advantage is the ratio between:
A. output force to input force
