WorksheetsPhysics Quiz
Total questions: 30
Worksheet time: 15mins
X-rays are produced when
High energy electrons are stopped by a metal target
High energy electrons are stopped by a metal target
Light is incident on a metal surface
A metal is heated to high temperature
The wave-particle duality is a fundamental concept in
Classical mechanics
Thermodynamics
Quantum mechanics
Electromagnetism
A p-n junction diode allows current to flow
In both directions equally
Only in one direction
Only when reverse biased
Only at high temperatures
The process of adding impurity to a pure semiconductor is called
Rectification
Amplification
Doping
Saturation
In a full-wave rectifier, the number of diodes used is
One
Two
Two
Four
The transistor is primarily used for
Voltage regulation
Amplification
Rectification
Oscillation
In an electromagnetic wave, the electric and magnetic fields are
Parallel to each other
Perpendicular to each other
At 45° to each other
Randomly oriented
Total internal reflection occurs when light travels from
A denser to a less dense medium at an angle greater than the critical angle
A denser to a less dense medium at an angle greater than the critical angle
A less dense to a denser medium at any angle
The critical angle for a water-air interface is about 49°. This means that
Light cannot enter water from air
Light rays in water incident at 50° are totally reflected
Light rays in air incident at 49° are totally reflected
The refractive index of water is 1/sin 49°
A converging lens produces a virtual image when the object is placed
At infinity
At the focus
Between the lens and the focus
Beyond the focus
The human eye focuses light on the
Cornea
Iris
Retina
Pupil
A microscope uses two converging lenses to
Reduce chromatic aberration
Produce magnified virtual images
Increase the field of view
Correct spherical aberration
The speed of sound in air is affected by
Frequency
Amplitude
Temperature
Wavelength
A pipe closed at one end resonates at its fundamental frequency when its length equals
λ/2
λ/4
λ
2λ
In a resonance tube experiment, the first resonance occurs at 15cm and the second at 48cm. The end correction is
1cm
1cm
2cm
3cm
A real image formed by a concave mirror is always
Erect and virtual
Smaller than the object
Inverted
Located behind the mirror
The force between two magnetic poles is inversely proportional to the
Square of the distance between them
Square of the distance between them
Distance between them
Product of their strengths
The earth's magnetic field is believed to be caused by
Magnetic materials in the crust
Electric currents in the liquid core
The sun's magnetic influence
Permanent magnets in the core
The direction of the force on a current-carrying conductor in a magnetic field is given by
Faraday's law
Fleming's left-hand rule
Lenz's law
Right-hand grip rule
The principle of operation of an electric motor is based on the
Heating effect of current
Force on a current in a magnetic field
Chemical effect of current
Induction by changing magnetic field
In an a.c. generator, the induced e.m.f. is maximum when the plane of the coil is
Parallel to the magnetic field
Perpendicular to the magnetic field
At 45° to the magnetic field
Rotating at constant speed
The core of a transformer is laminated to reduce
Hysteresis loss
Eddy current loss
Copper loss
Magnetic leakage
The process of emitting electrons from a metal surface when heated is called
Photoelectric effect
Thermionic emission
Field emission
Secondary emission
In a discharge tube at low pressure, the color of the glow depends on the
Current through the tube
Voltage applied
Type of gas in the tube
Shape of the tube
In the Franck-Hertz experiment, the discrete energy levels of atoms are demonstrated by
Continuous absorption spectra
Sharp drops in current at certain voltages
Linear increase in current with voltage
Constant current at all voltages
The line spectra of elements provide evidence for
Wave nature of light
Quantized energy levels in atoms
Particle nature of light
Continuous energy distribution
In the photoelectric effect, the stopping potential depends on the
Intensity of light
Frequency of light
Time of exposure
Area of the cathode
The work function of a metal is the
Energy needed to emit photons
Minimum energy needed to eject an electron
Energy of the incident photon
Kinetic energy of the emitted electron
In nuclear fission, a heavy nucleus splits into
Two equal fragments only
Lighter nuclei with release of energy
Protons and neutrons
Alpha and beta particles
The control rods in a nuclear reactor are made of
Uranium
Graphite
Cadmium or boron
Concrete
