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WorksheetsPrePSPM 2
Total questions: 40
Worksheet time: 31mins
Which of the following statements is TRUE about electric field strength?
The electric field strength arising from a point charge Q is inversely proportional to the magnitude of the charge Q
The electric field strength is a scalar quantity
The electric field strength is constant at zero electric potential
The electric field strength is the electric force per unit charge
Which one of the following statement about electrostatics is CORRECT?
The potential gradient is an electric field strength per unit length
The unit of electric potential energy is volt per meter
Coulomb force is the electric potential difference
Force per unit charge is equivalent to volt per meter
Which of the following statement is NOT TRUE about the relationship between electric field and electric potential?
An equipotential surface is perpendicular to the electric field lines at all points
The electric field always points in the direction of decreasing electric potential
The electric field can also be called the potential gradient
Work is done by the electric field when a charge moves from one point to another on the same equipotential surface
If voltage across a capacitor is doubled, the energy stored
becomes half the original energy
becomes four times the original energy
becomes twice the original energy
remains contant
The capacitance of a parallel plate capacitor is dependent on
the amount of charges on the plates
the amount of stored energy
the potential difference between the plates
the area of the plates
Which of the following has the same unit as the potential difference ?
Energy dissipated / Resistance
Power dissipated / Current
Charge / Time
Current × Time
The following quantities are supplied by a battery except
electron
energy
potential difference
electric field
Applying Kirchoff’s second rule to the loops as shown in the figure below, which of the following equations are CORRECT ?
L1:−2−12I1−5I2=0
L2: 24 −5I2−5I3=0
L2:−40−5I2−15I3=0 L1: 2+12I1+5I2=0
L1:14+12I1+5I2=0 L2:40+5I2+15I3=0
L1:−2−12I1−5I2=0 L2:24−5I2+15I3=0
A magnetic field will exert a force on a charged particle when the charged
is at rest
moves parallel to the magnetic field
moves perpendicular to magnetic field
moves outside the magnetic field
The magnetic forces acting on each other by two parallel wires with unequal currents flowing in the same directions are
attractive and unequal in magnitude
repulsive and unequal in magnitude
attractive and equal in magnitude
repulsive and equal in magnitude
Which of the following statements is TRUE about induced emf in a coil?
The direction of the induced emf in the coil is independent of the change that causes it
Induced emf is caused by change in the magnetic flux in the coil
The induced emf in the coil is only dependent on the variation of magnetic field
Direct current can generate induced emf in the coil
A conducting loop is placed in a magnetic field. Which of the following will NOT bring about the change in magnetic flux in the loop?
Change of magnetic field
Change of resistance of the loop
Change of cross-sectional area of the loop
Change of the angle between the magnetic field and the plane of the loop
The magnitude of the capacitive and inductive reactances of an RLC circuit are equal. What is the power factor of the circuit?
0.5
0.45
0.3
1
Inductive reactance increases as the _____.
frequency increases
frequency decreases
impedance increases
impedance decreases
Which of the following statement is TRUE concerning the impedance of an RCL circuit?
The impedance is dominated by C at high frequencies
The impedance is dominated by L at high frequencies
The impedance depends only the values of C and L
The impedance depends only the value of R
When a sinusoidal a.c source is connected to a pure capacitor, what will happen to the current in the connecting wire ?
Current changes sinusoidally and in phase with the applied potential difference
Current changes sinusoidally and leads the applied voltage by 2π rad
Current changes sinusoidally and follows the applied voltage by 2π rad
Current reaches a constant value
A man stands in front of a very large convex mirror. His image is
upright, diminished and virtual
upright, diminished and real
upright, enlarged and virtual
upright, enlarged and real
The distance from center of mirror, C to the pole of mirror is given as
2f
v
u
2R
To determine the characteristics of image formed we need to a draw ray diagram that uses
at least 2 rays that overlap each other
at least 3 rays out of 4 rays
plane mirror or lens
rays that passes through biconcave or biconvex mirror
Which statement is true about convex mirror?
image formed is virtual and diminished
have a positive value of focal length
image formed is real and diminished
image formed is real and magnified
To demonstrate the phenomenon of interference, we require two sources
Of the same frequency and having a constant phase difference
Of nearly the same frequency
Of the same frequency
Of different wavelengths
For Young's double slit experiment, the fifth dark fringe is equivalent to:
m=4 maximum
m=5 maximum
m=4 minimum
m=5 minimum
If the frequency of incident radiation is more than threshold frequency, the process of photoelectric effect takes place _____
slowly
rapidly
gradually
instantaneously
The energy of photoelectrons emitted from a metal surface can be increased by
using light of higher frequency.
using light of longer wavelength.
using light of higher intensity.
using monochromatic, polarized light.
According to the de Broglie hypothesis, which of the following statements is applicable to the
wavelength of a moving particle?
directly proportional to its energy
directly proportional to its momentum
inversely proportional to its energy
inversely proportional to its momentum
The electron microscope’s main advantage over the optical microscope is which of the following?
greater ease of portability
dispenses with need for a lens
higher power lens used
higher resolution
All of the following are quarks except
strange
bottom
charm
tau
There are three families of leptons;
electron, muon, and pi.
electron, muon, and tau.
electron, pi and tau.
electron, pi and neutrino.
What is the job of the magnetic field in a cyclotron?
Create a force perpendicular to the motion of the particle, which acts a centripetal force
To accelerate the particle between the dees
To apply a force parallel to the direction of motion of the particle, which acts as the centripetal force.
So the direction of the force can be alternated every half turn
Which description best applies to Lenz's Law?
An induced current occurs when a magnet passes through a tube.
When a change in magnetic field occurs to a coil the direction of current goes in the in the other direction to this change.
The direction of an induced current is such to align with the change that created it.
A magnet is a tube is always slowed by its magnetic field.
Resistivity is defined as .....
the capacitance of a unit length per unit cross-sectional area of the material
the resistance of a unit length per unit cross-sectional area of the material
the capacitance of a unit cross-sectional area per unit length of the material
the resistance of a unit cross-sectional area per unit length of the material
