Quiz
PhysX #2
Create a free account to finish this quiz
Save your progress and see your final score.
Already have an account? Sign in
Questions in this quiz (30)
1Which of the following is not generally observed in a geomagnetic storm?
- ACharged particles streaming out from the Sun
- BFluctuations in the Earth’s magnetic field
- CDisruption of electrical power transmission
- DDisruption of microwave propagation
2A device that reverses magnetic field polarity to keep a dc motor rotating is
- AA solenoid
- BAn armature coil
- CA commutator
- DA field coil
3When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage
- AIncreases
- BDecreases
- CRemains constant
- DReaches zero
4For a given wirewound core, an increase in current through the coil
- AReverses the flux lines
- BDecreases the flux density
- CIncreases the flux density
- DCauses no change in flux density
5Which statements are correct?
- ACharges of opposite sign attract one another and charges of the same sign repel one another. Total charge in an isolated system is conserved. Charge is quantized.
- BCharges of opposite sign repel one another and charges of the same sign attract one another. Total charge in an isolated system is conserved. Charge is quantized.
- CCharges of opposite sign attract one another and charges of the same sign repel one another. Total charge in an isolated system is not conserved. Charge is quantized.
- DCharges of opposite sign repel one another and charges of the same sign attract one another. Total charge in an isolated system is ot conserved. Charge is not quantized.
- ENo correct answer
6When a box rests on the floor, it is acted upon by the gravitational and the _________________ force.
- ACentrifugal
- BAcceleration
- CNormal
- DInertia
- EFriction
7Motion is produced by
- AAll forces
- BUnbalanced forces
- CBalanced forces
- DThe absence of force
- ENone of them
8In inelastic collision between the two bodies __________.
- AOnly momentum of the system is conserved
- BOnly the kinetic Energy of the system is conserved
- CBoth the kinetic Energy and Momentum of the system remain the same
- DTotal energy is not conserved
9In elastic collision between the two bodies __________.
- AOnly momentum of the system is conserved
- BOnly the kinetic Energy of the system is conserved
- CBoth the kinetic Energy and Momentum of the system remain the same
- DTotal energy is not conserved
10When the force and displacement are parallel to each other, then work is __________.
- AMinimum
- BMaximum
- CNone of these
- DDepends on force magnitude
11In rotational motion, the quantity, which plays the same role as the inertial mass in linear motion, is called ___________.
- AInertia
- BAngular momentum
- CMoment of inertia
- DTorque
- ECenter of mass
12A sound wave can be characterized as
- AA transverse wave
- BA longitudinal wave
- CA transverse wave or a longitudinal wave, depending on the nature of its source
- DOne that carries no energy
- EA wave that does not require a medium to be transmitted from one place to the other
13A woman sits on a spinning stool with her arms folded. When she extends her arms, which of the following occurs
- AShe increases her moment of inertia, thus increasing her angular speed
- BShe increases her moment of inertia, thus decreasing her angular speed.
- CShe decreases her moment of inertia, thus increasing her angular speed
- DShe decreases her moment of inertia, thus decreasing her angular speed
- EHer angular speed remains constant by conservation of angular momentum
14The ability of a material to remain magnetized after removal of the magnetizing force is known as
- APermeability
- BReluctance
- CHysteresis
- DRetentivity
15The induced voltage across a stationary conductor in a stationary magnetic field is
- AZero
- BReversed in polarity
- CIncreased
- DDecreased
16When a solenoid is activated, the force that moves the plunger is
- AAn electromagnetic field
- BA permanent magnetic field
- CVarying voltage
- DA steady current
17If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage
- ARemains unchanged
- BReverses polarity
- CIncreases
- DDecreases
18You charge parallel-plate capacitor. When you pull the plates apart to a larger separation and battery remains connected to the capacitor
- ADecreases
- BRemains the same
- CAlternates
- DIncreases
- EChanges in an unpredictable way
19Induction current opposes the reason causing it. It is the shortest formulation of
- AEinstein’s law
- BLentz law
- CBiot-Savart law
- DFaraday’s law
- EAmpere’s law
20Paramagnetism is closely associated with
- AThe torque
- BThe force exerted by electron dipole moments on each other
- CThe tendency of electron dipole moments to align with an applied magnetic field
- DThe exchange force between electrons
- EThe tendency of electrons dipole moments to align opposite to an applied magnetic field
21The thermal conductivity is the analog to:
- AThermal expansion
- BResistivity
- CElasticity
- DDiffusivity
- EViscosity
22Resistance of metals in classical theory of electric conductivity is caused by
- ACollision of free electrons with dislocations or clasters
- BCollision of free electrons with impurity atoms in internodes
- CCollision of free electrons with each other
- DCollision of free electrons with vacancy defects
- ECollision of free electrons with ions of crystal structure
23Electric theory of dispersion was evaluated by:
- ALorentz
- BNewton
- CEinstein
- DMinkovsky
- EMaxwell
24Loop is uniformly rotating with angular velocity ω in uniform magnetic field. Loop has N coils and area of the loop is S. Rotating axis lies on loop’s plane and perpendicular to induction. What is the maximal EMF appeared in the loop:
- ANBS/2
- BNBS
- CNBScos(wt)
- DNBSw/2
- ENBSw
25An electrton traveling with speed v around a circle of radius r is equivalent to a current of:
- Aevr/2
- Bev/r
- C2πer/v
- D2πev/r
- Eev/2πr
26An electromagnetic field propagates in +x direction. The electric field at a point in space is momentarily oriented in –z
direction. The magnetic field at that point is momentarily oriented in- A–y direction
- B+y direction
- C+z direction
- D+x direction
- E-x direction
27In RLC circuit angular frequency of AC source rises. Inductive reactance
- ARemains the same
- BIncreases
- COscillates about certain value
- DAlternates
- EDecreases
28The rapid exponential decay in just a few cycles of the charge on the plates of capacitor in an RLC circuit might be due to:
- AA large capacitance
- BA small capacitance
- CA large resistance
- DA small resistance
- EA large inductance
29Intrinsic semiconductors are
- AMaterials doped by impurities
- BPure elemental materials without impurities
- CMaterials doped by donor impurity
- DMaterials doped by acceptor impurity
- EAny materials
30In a charge-free region of space, closed container is placed in an electric field. A requirement for the total electric flux through the surface of the container to be zero is that
- AThe field must be uniform
- BThe container must be oriented in a certain way
- CThe container must be symmetric
- DThe requirement does not exist – the total electric flux is zero no matter what
Information
- Description
- just quiz
- Author
- Hanzo Conard
- Language
- English
- Views
- 61
- Tags
- Rating
- No ratings yet Rate this quiz