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WorksheetsФизика в пизду
Total questions: 62
Worksheet time: 31mins
The dimension of velocity is the same as of:
torque
heat
work
speed
If the velocity of an object in rectilinear motion is constant and not zero then:
position of the object is constant
acceleration of the object is zero
At isothermal process:
W=nRTln(V2/V1)
W=0
W=ΔU
W=-Q
If electrons were removed from a neutral object, the object became:
negatively charged
cold
hot
positively charged
neutrally charged
It follows from Ohm's law:
V=I/R
V=I/R^2
V=R/I
V=I*R
V=I^2/R
The direction of the magnetic force exerted on a charge moving at speed v in a magnetic field B is:
perpendicular to v
parallel to B
parallel to v
at any angle to B
at any angle to v
The change in entropy when water is heated from T1 to T2, T2<373.15 K is:
m*c_ice*ln(1+T1/T2)
m*c_water*ln(1+T2/T1)
m*c_water*ln(1+T1/T2)
m*c_water*ln(T2/T1)
Which of the following statements is true?
the instantaneous velocity is defined as dr/dt
the average velocity is defined as ∆v/∆t
What does Newton's First Law of Motion state?
An object moves in a straight line unless gravity pulls it downward.
An object remains at rest or in uniform motion unless acted upon by a net external force.
According to the Maxwell–Boltzmann speed distribution function, the highest number of molecules has a speed close to the root mean square speed.
True
False
True/False: It is impossible to convert all absorbed heat into work in a cyclic process.
True
False
True/False: The electric force between two point charges q1 and q2 separated by a distance r is given by k·r^2/(q1·q2)
False
True
True/False: Kirchhoff’s loop rule follows from the law of conservation of charge
False
True
True/False: The direction of the magnetic force exerted on a charge moving in a magnetic field is perpendicular to its velocity.
False
True
True/False: Induced currents produce magnetic fields which tend to amplify the magnetic flux changes that induce them.
False
True
True/False: If the masses don't move, for the smallest possible M, there is no friction on mass M.
True
False
B
isochoric
adiabatic
isothermal
isobaric
C
isochoric
adiabatic
isothermal
isobaric
D
isochoric
adiabatic
isothermal
isobaric
A
isochoric
adiabatic
isothermal
isobaric
A metal rod of mass m carrying a current I glides on two horizontal rails of distance L apart. A vertical magnetic field B keeps the rod moving at a constant speed V. What is the coefficient of kinetic friction between the rod and rails?
IVL/(mgB)
IVB/(mg)
IBL/(mg)
IVL/(mg)
BL/(mgV)
A uniform electric field bj + ck intersects a surface of area A. What is the flux through this area if the surface lies in the xy plane?
bA
0
(b+c)*A
cA
A*(b^2+c^2)^0.5
The work of the gas done in process AB
negative
positive
zero
infinite
impossible to determine.
The work of the gas done in process BC
negative
positive
zero
infinite
impossible to determine.
The work of the gas done in process CD
negative
positive
zero
infinite
impossible to determine.
The work of the gas done in process DA
negative
positive
zero
infinite
impossible to determine.
The work of the gas in process AB is: a. impossible to determine
negative
zero
infinite
positive
True/False: If the masses don't move, for the smallest possible M, friction on mass M is directed upward along the inclined plane.
False
True
Which of the following statements is true?
the average acceleration is defined as v/t
the average velocity is defined as Δr/Δt
True/False: The induced magnetic field opposes the change that produces the induced current.
True
False
True/False: Kirchhoff’s loop rule says that the sum of the currents entering any junction in a circuit must equal the sum of the currents leaving that junction.
False
True
True/False: Heat flows spontaneously from cold to hot bodies.
True
False
True/False: The electric force between two point charges q1 and q2 separated by a distance r is given by k·q1·q2/r
True
False
True/False: The direction of the magnetic force exerted on a charge moving in a magnetic field is parallel to its velocity
True
False
What is another name for Newton's First Law of Motion?
Law of Inertia
Law of Force
The Maxwell–Boltzmann speed distribution function indicates that most molecules have speeds near the most probable speed.
True
False
A uniform electric field bi + cj intersects a surface of area A. What is the flux through this area if the surface lies in the yz plane?
A*(b^2+c^2)^0.5
bA
cA
0
(b+c)*A
A metal rod of mass m carrying a current I glides on two horizontal rails of distance L apart. What vertical magnetic field B is required to keep the rod moving at a constant speed V if the coefficient of kinetic friction between the rod and rails is k?
kmg/(IVL)
kmg/(IL)
IVL/(kmg)
IL/(mg)
mgV/kl
True/False: The magnitude of the magnetic force exerted on a particle with charge q, moving at velocity v, θ is the angle between B and v, is proportional to q⋅v⋅sin(θ)
True
False
A metal rod of mass m carrying a current I glides on two horizontal rails. A vertical magnetic field B keeps the rod moving at a constant speed V. The coefficient of kinetic friction between the rod and rails is k. The distance between the two horizontal rails is
kmg/(IV)
IVB/(kmg)
kmg/(IVB)
kmg/(IB)
IB/(mgV)
A uniform electric field bj + ck intersects a surface of area A. What is the flux through this area if the surface lies in the xz plane?
cA
0
A*(b^2+c^2)^0.5
(b+c)*A
bA
What does inertia depend on?
The net force acting on the object.
Mass of the object.
True/False: Entropy decreases during natural processes.
True
False
Which of the following statements is true?
the instantaneous velocity is the rate of change of position, dx/dt
the average acceleration is defined as dv/dt
According to the Maxwell–Boltzmann speed distribution function, the highest number of molecules has a speed close to the average speed of molecules.
True
False
True/False: The emf induced in a closed loop does not depend on the time rate of change of the magnetic flux through the circuit
False
True
True/False: If the masses don't move, the normal force N on mass M is given by N=Mgcos(θ).
True
False
True/False: The electric force between two point charges q1 and q2 separated by a distance r is given by k·q1·q2/r^2
False
True
True/False: Kirchhoff’s rules are valid only when the currents in various branches are not constant.
False
True
True/False: Kirchhoff’s junction rule is a consequence of Gauss's law
True
False
A uniform electric field bi + ck intersects a surface of area A. What is the flux through this area if the surface lies in the xz plane?
bA
0
cA
(b+c)*A
A*(b^2+c^2)^0.5
True/False: The magnitude of the magnetic force exerted on a charged particle, moving at velocity v is proportional to B⋅v⋅sin(θ), θ is the angle between B and v
False
True
Which of the following statements is true?
the average velocity is defined as ∆v/∆t
the average acceleration is defined as ∆v/∆t
True/False: The electric force between two point charges q1 and q2 separated by a distance r is given by k·q1·q2/r^0.5
False
True
A metal rod of mass m carrying a current I glides on two horizontal rails of distance L apart. A vertical magnetic field B keeps the rod moving at a constant speed V. The coefficient of kinetic friction between the rod and rails is k. The gravitational acceleration is:
IVL/(km)
km/(IBL)
IVBL/(km)
km/(IVL)
IBL/(km)
As per the Maxwell–Boltzmann speed distribution function, the majority of molecules exhibit speeds close to the most probable speed.
True
False
True/False: The emf induced in a closed loop is proportional to the square of the rate of change of the magnetic flux through the circuit.
True
False
The work of the gas in process AB is:
positive
zero
infinite
negative
impossible to determine
True/False: If the masses don't move, the normal force N on mass M is vertical, not perpendicular to the inclined surface
False
True
True/False: Heat engines can operate without any energy loss
True
False
What happens to an object when the net external force acting on it is zero?
It remains at rest or continues moving with uniform velocity.
It comes to a stop.
