WorksheetsR3_Quiz on all Prerequisite Topics_Sayali Kanhav
Total questions: 30
Worksheet time: 15mins
Which of the following devices works based on total internal reflection?
Concave mirror
Optical fiber
Plane mirror
Convex lens
Which of the following best defines diffraction of light?
Splitting of light into different colors
Bending of light around the corners of obstacles
Absorption of light by opaque surfaces
Reflection of light at a smooth surface
What is the SI unit of magnetic field (B)?
Tesla
Weber
Ampere/meter
Newton
The majority carriers in an N-type semiconductor are:
Holes
Electrons
Protons
Ions
In Young's double slit experiment, the interference pattern is a result of:
Reflection of light
Coherent sources
Total internal reflection
Dispersion
Which of the following is a direct consequence of diffraction?
Optical illusions
Sharp shadows
Fuzzy edges in shadows
Bright refraction lines
The energy band gap of silicon is approximately:
0.1 eV
0.7 eV
1.1 eV
2.5 eV
A P-type semiconductor is formed by doping with:
Pentavalent atom
Tetravalent atom
Trivalent atom
Divalent atom
Coulomb's law is applicable to:
Moving charges
Stationary point charges
Magnetic poles
Continuous charge distributions only
In semiconductors, the energy gap between the valence and conduction band is:
Zero
Very large
Moderate
Infinite
Which of the following phenomena supports the wave nature of light?
Reflection
Refraction
Diffraction
Absorption
A charged particle moving in a magnetic field experiences maximum force when:
It moves parallel to the field
It is at rest
It moves perpendicular to the field
It moves at an angle of 45°
The direction of magnetic force on a moving charge is given by:
Right-hand grip rule
Left-hand rule
Right-hand rule
Maxwell's law
The process of adding impurities to a semiconductor is called:
Insulation
Conduction
Doping
Diffusion
What happens to the conductivity of an intrinsic semiconductor when temperature increases?
Decreases
Increases
Becomes zero
Remains constant
Electric field due to a positive point charge points:
Radially outward
Radially inward
Circularly
Perpendicular to the charge
If the distance between two charges is doubled, the force becomes:
Half
One fourth
Double
Four times
In an intrinsic semiconductor, the number of electrons is:
More than number of holes
Less than number of holes
Equal to number of holes
Zero
The critical angle is defined as:
The angle of incidence when the angle of refraction is 90°
The maximum angle of incidence
The angle when reflection is minimum
The angle when diffraction is maximum
The electric field inside a conductor in electrostatic equilibrium is:
Infinite
Constant
Zero
Varying linearly
Snell's Law relates which two phenomena?
Diffraction and reflection
Refraction and wavelength
Angle of incidence and angle of refraction
Frequency and speed
Intrinsic semiconductors are:
Pure semiconductors
Doped with trivalent atoms
Doped with pentavalent atoms
Metals
What causes interference in light waves?
Reflection
Refraction
Superposition
Diffraction
Which color of light diffracts the most?
Red
Green
Blue
Violet
The unit of electric field is:
N/m
N/C
V
J/C
In the energy band diagram of a conductor:
Valence and conduction bands overlap
A wide gap exists
Only conduction band is occupied
Band gap is around 1 eV
Magnetic lines of force:
Intersect each other
Are circular around a straight conductor
Start and end on charges
Are always straight lines
Diffraction effects are most noticeable when:
Light is of very high intensity
Wavelength of light is small compared to the obstacle
Wavelength is comparable to the size of the obstacle
Light is incident at 90 degrees
Lorentz force is the force on:
A moving charge in an electric field
A stationary charge in a magnetic field
A moving charge in electric and magnetic fields
A stationary charge in vacuum
Which of the following is an example of an intrinsic semiconductor?
Copper
Silicon
Germanium with phosphorus
Aluminum
