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PhysX #2

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just quiz
Hanzo Conard
Quiz by Hanzo Conard, updated more than 1 year ago
Hanzo Conard
Created by Hanzo Conard over 7 years ago
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Question 1

Question
Which of the following is not generally observed in a geomagnetic storm?
Answer
  • Charged particles streaming out from the Sun
  • Fluctuations in the Earth’s magnetic field
  • Disruption of electrical power transmission
  • Disruption of microwave propagation

Question 2

Question
A device that reverses magnetic field polarity to keep a dc motor rotating is
Answer
  • A solenoid
  • An armature coil
  • A commutator
  • A field coil

Question 3

Question
When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage
Answer
  • Increases
  • Decreases
  • Remains constant
  • Reaches zero

Question 4

Question
For a given wirewound core, an increase in current through the coil
Answer
  • Reverses the flux lines
  • Decreases the flux density
  • Increases the flux density
  • Causes no change in flux density

Question 5

Question
Which statements are correct?
Answer
  • Charges 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.
  • Charges 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.
  • Charges 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.
  • Charges 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.
  • No correct answer

Question 6

Question
When a box rests on the floor, it is acted upon by the gravitational and the _________________ force.
Answer
  • Centrifugal
  • Acceleration
  • Normal
  • Inertia
  • Friction

Question 7

Question
Motion is produced by
Answer
  • All forces
  • Unbalanced forces
  • Balanced forces
  • The absence of force
  • None of them

Question 8

Question
In inelastic collision between the two bodies __________.
Answer
  • Only momentum of the system is conserved
  • Only the kinetic Energy of the system is conserved
  • Both the kinetic Energy and Momentum of the system remain the same
  • Total energy is not conserved

Question 9

Question
In elastic collision between the two bodies __________.
Answer
  • Only momentum of the system is conserved
  • Only the kinetic Energy of the system is conserved
  • Both the kinetic Energy and Momentum of the system remain the same
  • Total energy is not conserved

Question 10

Question
When the force and displacement are parallel to each other, then work is __________.
Answer
  • Minimum
  • Maximum
  • None of these
  • Depends on force magnitude

Question 11

Question
In rotational motion, the quantity, which plays the same role as the inertial mass in linear motion, is called ___________.
Answer
  • Inertia
  • Angular momentum
  • Moment of inertia
  • Torque
  • Center of mass

Question 12

Question
A sound wave can be characterized as
Answer
  • A transverse wave
  • A longitudinal wave
  • A transverse wave or a longitudinal wave, depending on the nature of its source
  • One that carries no energy
  • A wave that does not require a medium to be transmitted from one place to the other

Question 13

Question
A woman sits on a spinning stool with her arms folded. When she extends her arms, which of the following occurs
Answer
  • She increases her moment of inertia, thus increasing her angular speed
  • She increases her moment of inertia, thus decreasing her angular speed.
  • She decreases her moment of inertia, thus increasing her angular speed
  • She decreases her moment of inertia, thus decreasing her angular speed
  • Her angular speed remains constant by conservation of angular momentum

Question 14

Question
The ability of a material to remain magnetized after removal of the magnetizing force is known as
Answer
  • Permeability
  • Reluctance
  • Hysteresis
  • Retentivity

Question 15

Question
The induced voltage across a stationary conductor in a stationary magnetic field is
Answer
  • Zero
  • Reversed in polarity
  • Increased
  • Decreased

Question 16

Question
When a solenoid is activated, the force that moves the plunger is
Answer
  • An electromagnetic field
  • A permanent magnetic field
  • Varying voltage
  • A steady current

Question 17

Question
If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage
Answer
  • Remains unchanged
  • Reverses polarity
  • Increases
  • Decreases

Question 18

Question
You charge parallel-plate capacitor. When you pull the plates apart to a larger separation and battery remains connected to the capacitor
Answer
  • Decreases
  • Remains the same
  • Alternates
  • Increases
  • Changes in an unpredictable way

Question 19

Question
Induction current opposes the reason causing it. It is the shortest formulation of
Answer
  • Einstein’s law
  • Lentz law
  • Biot-Savart law
  • Faraday’s law
  • Ampere’s law

Question 20

Question
Paramagnetism is closely associated with
Answer
  • The torque
  • The force exerted by electron dipole moments on each other
  • The tendency of electron dipole moments to align with an applied magnetic field
  • The exchange force between electrons
  • The tendency of electrons dipole moments to align opposite to an applied magnetic field

Question 21

Question
The thermal conductivity is the analog to:
Answer
  • Thermal expansion
  • Resistivity
  • Elasticity
  • Diffusivity
  • Viscosity

Question 22

Question
Resistance of metals in classical theory of electric conductivity is caused by
Answer
  • Collision of free electrons with dislocations or clasters
  • Collision of free electrons with impurity atoms in internodes
  • Collision of free electrons with each other
  • Collision of free electrons with vacancy defects
  • Collision of free electrons with ions of crystal structure

Question 23

Question
Electric theory of dispersion was evaluated by:
Answer
  • Lorentz
  • Newton
  • Einstein
  • Minkovsky
  • Maxwell

Question 24

Question
Loop 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:
Answer
  • NBS/2
  • NBS
  • NBScos(wt)
  • NBSw/2
  • NBSw

Question 25

Question
An electrton traveling with speed v around a circle of radius r is equivalent to a current of:
Answer
  • evr/2
  • ev/r
  • 2πer/v
  • 2πev/r
  • ev/2πr

Question 26

Question
An 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
Answer
  • –y direction
  • +y direction
  • +z direction
  • +x direction
  • -x direction

Question 27

Question
In RLC circuit angular frequency of AC source rises. Inductive reactance
Answer
  • Remains the same
  • Increases
  • Oscillates about certain value
  • Alternates
  • Decreases

Question 28

Question
The rapid exponential decay in just a few cycles of the charge on the plates of capacitor in an RLC circuit might be due to:
Answer
  • A large capacitance
  • A small capacitance
  • A large resistance
  • A small resistance
  • A large inductance

Question 29

Question
Intrinsic semiconductors are
Answer
  • Materials doped by impurities
  • Pure elemental materials without impurities
  • Materials doped by donor impurity
  • Materials doped by acceptor impurity
  • Any materials

Question 30

Question
In 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
Answer
  • The field must be uniform
  • The container must be oriented in a certain way
  • The container must be symmetric
  • The requirement does not exist – the total electric flux is zero no matter what
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