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ICSE Physics Class 9 Trivia for Students
The refractive index of a material depends upon
(A) the permittivity of the medium
(B) the permeability of the medium
(C) both (A) and (B)
(D) the density of the medium
Option c – both (A) and (B)
The Wavelength range of visible light is
(A) 400-700 nm
(B) 100-300 nm
(C) 800-1000 nm
(D) 1200-1400 nm
Option a – 400-700 nm
A plane wavefront is incident on a plane surface at zero angles of incidence. The wavefront is :
(A) parallel to the surface
(B) perpendicular to the surface
(C) inclined at 45° with the surface
(D) inclined at 60° with the surface
Option a – parallel to the surface
In Huygens wave theory, the locus of all points in the same state of vibration is called :
(A) ray
(B) wavefront
(C) vibrator
(D) wavelength
Option b – wavefront
Which of the following does not support the wave nature of light? :
(A) Polarization
(B) Interference
(C) Diffraction
(D) Photoelectric effect
Option d – Photoelectric effect
Finally accepted nature of light is
(A) wave
(B) particle
(C) wave as well as a particle
(D) neither wave
Option c – wave as well as a particle
Particles of light are called as
(A) photon
(B) proton
(C) neutron
(D) electron
Option a – photon
Light waves are
(A) mechanical waves
(B) electromagnetic waves
(C) both (A) and (B)
(D) neither (A) nor (B)
Option b – electromagnetic waves
Electric and magnetic fields in light waves are
(A) parallel to each other
(B) perpendicular to each other
(C) 45° with each other
(D) 60° with each other
Option b – perpendicular to each other
The velocity of light waves in the medium depends upon
(A) the density of the medium
(B) the refractive index of the medium
(C) the elasticity of the medium
(D) inertia of medium
Option b – the refractive index of the medium
An isotropic medium is that in which :
(A) the speed of light changes
(B) the speed of light remains constant
(C) both (A) and (B)
(D) the direction of propagation of light changes
Option b – the speed of light remains constant
As per modern theory, light has :
(A) particle nature
(B) wave nature
(C) neither wave nor particle in nature
(D) wave as well as particle nature
Option d – wave as well as particle nature
Laser light is considered to be coherent because it consists of
(A) many wavelengths
(B) uncoordinated wavelength
(C) coordinated waves of exactly the same wavelength
(D) divergent beam
Option c – coordinated waves of exactly the same wavelength
The scientists who later changed Huygens’ theory and postulated that light consisted of transverse waves are:
(A) Newton
(B) Fresnel
(C) Young
(D) Maxwell
Option b – Fresnel
In accordance with the wave theory of light, the colors of light are due to different :
(A) amplitudes
(B) wavelengths
(C) frequencies
(D) phases
Option b – wavelengths
Color of light is determined by :
(A) amplitude
(B) wavelength
(C) frequency
(D) phase
Option c – frequency
Luminiferous ether medium has the property of
(A) zero density
(B) transparency
(C) elasticity and inertia
(D) all of these
Option d – all of these
Light is propagated in the form of transverse electromagnetic waves as per the opinion of
(A) Huygens
(B) Max Planck
(C) Newton
(D) Maxwell
Option d – Maxwell
A string under a tension of 100 N, emitting its fundamental note, gives 5 beats per second with a tuning fork. When the tension is increased to 121 N, again 5 beats per second are heard. The frequency of the fork is :
(A) 95 Hz
(B) 105 Hz
(C) 190 Hz
(D) 210 Hz
Option b – 105 Hz
A string in a musical instrument is 50 cm long and its fundamental frequency is 800 Hz. If a frequency of 1000 Hz is to be produced, then the required length of the string is :
(A) 62.5 cm
(B) 40 cm
(C) 50 cm
(D) 37.5 cm
Option b – 40 cm
The frequency of the first harmonic of a string stretched between two points is 100 Hz. The frequency of the third overtone is :
(A) 200 Hz
(B) 300 Hz
(C) 400 Hz
(D) 600 Hz
Option c – 400 Hz
A wire of length 50 cm and has a mass of 0.98 8 g gram is subjected to a tension of 4.9 N. Then the fundamental frequency of vibrations of the wire is :
(A) 50 Hz
(B) 100 Hz
(C) 150 Hz
(D) 200 Hz
Option a – 50 Hz
What tension should be applied to a wire of length 1 m and mass 10 grams, if it is to vibrate with a fundamental frequency of 50 Hz? :
(A) 10 N
(B) 50 N
(C) 100 N
(D) 150 N
Option c – 100 N
The distance between two consecutive nodes on a stretched string is 10 cm. It is in resonance with a tuning fork of a frequency of 256 Hz. What is the velocity of the progressive wave in the string?
(A) 51.2 m/s
(B) 25.6 m/s
(C) 12.8 m/s
(D) 6.4 m/s
Option a – 51.2 m/s
In order to increase the frequency of transverse vibrations of a stretched wire by 50%, its tension must be increased by :
(A) 50 %
(B) 100 %
(C) 125 %
(D) 150 %
Option c – 125 %
A stationary wave is produced on a stretched string that is 1.5 metres long and fixed at its ends. If six loops are formed on the string, then the wavelength of the wave is :
(A) 0.5 m
(B) 0.75 m
(C) 1.0 m
(D) 1.5 m
Option a – 0.5 m
A wave of frequency 100 Hz travels along a string towards its fixed end. When this wave travels back, after reflection, a node is formed at a distance of 10 cm from the fixed end. The speed of the wave (incident and reflected) is :
(A) 5 m/s
(B) 10 m/s
(C) 20 m/s
(D) 40 m/s
Option c – 20 m/s
5.5 m length of the string has a mass of 0.035 kg. If the tension in the string is 77 N, the speed of a wave on the string is :
(A) 110 m/s
(B) 165 m/s
(C) 77 m/s
(D) 102 m/s
Option a – 110 m/s
A vibrating stretched string resonates with a tuning fork of frequency 512 Hz when the length of the string is 0.5 m. The length of the string required to vibrate resonantly with a tuning fork of frequency 256 Hz would be :
(A) 0.25 m
(B) 1.0 m
(C) 0.75 m
(D) 2.0 m
Option b – 1.0 m
The frequency of the second overtone of a vibrating string is 600 Hz and the speed of the wave is 320 m/s. The wavelength, when it vibrates in the fundamental mode, is :
(A) 0.53 m
(B) 1.6 m
(C) 1.06 m
(D) 16 m
Option b – 1.6 m
Temperature is a measurement of the coldness or hotness of an object. The definition is based on :
(A) Zeroth law of thermodynamics
(B) the First law of thermodynamics
(C) the Second law of thermodynamics
(D) Newton’s law of cooling
Option a – Zeroth law of thermodynamics
When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is :
(A) Zeroth law of thermodynamics
(B) First law of thermodynamics
(C) Second law of thermodynamics
(D) None of these
Option a – Zeroth law of thermodynamics
Which of the following is not a thermodynamic coordinate?
(A) Pressure
(B) Volume
(C) Temperature
(D) Universal gas constant
Option d – Universal gas constant
Which of the following is not a thermodynamic system?
(A) Pressure and volume
(B) Volume and temperature
(C) Temperature and pressure
(D) Any one of pressure, volume, or temperature
Option d – Any one of pressure, volume, or temperature
When two bodies A and B are in thermal equilibrium :
(A) The kinetic energies of all molecules of A and B will be equal
(B) The potential energies of all molecules of A and B will be equal
(C) The internal energies of the two bodies will be equal
(D) The average kinetic energy of the molecules of the two bodies will be equal
Option c – The internal energies of the two bodies will be equal
Thermodynamics mostly deals with
(A) Measurement of the quantity of heat
(B) Change of state
(C) Transfer of quantity of heat
(D) Conservation of heat to other forms of energy
The word thermodynamics means :
(A) Heat
(B) Energy in transit
(D) Temperature difference
Water does not wet an oily glass because :
(A) Cohesive force of oil > adhesive force between oil and glass
(B) Cohesive force of oil > cohesive force of water
(C) Oil repels water
(D) Cohesive force of water > adhesive force between water and oil molecules
A liquid does not wet the sides of a solid if the angle of contact is :
(A) Zero
(B) Obtuse
(C) Acute
(D) 90°
Option b – Obtuse
Consider a liquid contained in a vessel. The liquid-solid adhesive force is very weak as compared to the cohesive force in liquid. The shape of the liquid surface in the solid will be :
(A) Horizontal
(B) Almost vertical
(C) Concave
(D) Convex
Option d – Convex
In case the angle of contact is obtuse, the free surface of a liquid in a capillary tube is :
(A) Convex
(B) Concave
(C) Plane
(D) None of the above
Option a – Convex
The shape of the surface of a liquid in a tube is concave if
(A) Cohesive forces of attraction between the molecules of the liquid are much stronger than adhesive forces.
(B) Cohesive forces between the molecules of the liquid are much weaker than adhesive forces
(C) The cohesive forces are absent
(D) Cohesive forces are equal to that adhesive forces
Option b – Cohesive forces between the molecules of the liquid are much weaker than adhesive forces
In which of the following case angle of contact is 90°?
(A) Cohesive forces of attraction between the molecules of the liquid are much stronger than adhesive forces
(B) Cohesive forces between the molecules of the liquid are much weaker than adhesive forces
(C) The cohesive forces are absent
(D) Cohesive forces are equal to that adhesive forces
Option d – Cohesive forces are equal to that adhesive forces
The wettability of a surface by a liquid depends primarily on
(A) Surface tension
(B) Density
(C) Angle of contact between the surface and the liquid
(D) Viscosity
Option c – Angle of contact between the surface and the liquid
An oil drop is placed on the surface of the water. It will :
(A) Remains on the surface as a sphere
(B) Remains on the surface as a distorted drop
(C) Spread as a thin layer
(D) Partly be as a spherical droplet and partly as a thin film
Option c – Spread as a thin layer
The shape of the surface of a liquid in a tube is convex if :
(A) Cohesive forces of attraction between the molecules of the liquid are much stronger than adhesive forces.
(B) Cohesive forces between the molecules of the liquid are much weaker than adhesive forces
(C) The cohesive forces are absent
(D) Cohesive forces are equal to that adhesive forces
Option a – Cohesive forces of attraction between the molecules of the liquid are much stronger than adhesive forces
A charged particle moves through a magnetic field in a direction perpendicular to it. Then the :
(A) Speed of the particle remains unchanged
(B) Direction of the particle remains unchanged
(C) Acceleration remains unchanged
(D) Velocity remains unchanged
Option a – Speed of the particle remains unchanged
The frequency of the charged particle circulating at a right angle to a uniform magnetic field does not depend upon the :
(A) Speed of the particle
(B) Mass of the particle
(C) Charge of the particle
(D) Magnetic field
Option a – Speed of the particle
If a particle is rotating between two magnetic fields with a certain velocity. This velocity depends upon :
(A) Acceleration
(B) Torque
(C) Angular velocity
(D) Magnetic field
Option d – Magnetic field
A proton is accelerated by a cyclotron where the applied magnetic field is 2 T. The potential difference is 100 kV then how many turns the proton has to move between the dees to acquire a kinetic energy of 20 Mev?
(A) 200
(B) 300
(C) 150
(D) 100
Option d – 100
The frequency of proton produced by cyclotron in a magnetic field of induction 1T is
(A) 15.26 MHz
(B) 1.00 MHz
(C) 1.59 MHz
(D) 159 MHz
Option a – 15.26 MHz
A charge particle move perpendicular to the magnetic field. Then its :
(A) speed remains unchanged
(B) direction remains unchanged
(C) velocity remains unchanged
(D) momentum remains unchanged
Option a – speed remains unchanged
A synchro cyclotron is a device used to accelerate the charged particle if its velocity increases above :
(A) Velocity light
(B) 10% velocity of light
(C) 50% velocity of light
(D) Greater than the velocity of light
Option b – 10% velocity of light
Cyclotron is a device used to accelerate :
(A) Positive charge particles
(B) Negative charge particles only
(C) Both positive and negative charge particles
(D) Neither positive nor negative charge particles
Option a – Positive charge particles
Inside hollow dee’s of cyclotrons, charge particles are under the influence of :
(A) Electric field only
(B) Magnetic field only
(C) Both electric and magnetic field
(D) Neither electric nor magnetic field
Option b – Magnetic field only
Cyclotron is a device used in the study of :
(A) Mechanics
(B) Electricity
(C) Nuclear physics
(D) Electronics
Option c – Nuclear physics
In cyclotrons, the angular frequency of charged particles is independent of the :
(A) Mass
(B) Speed
(C) Charge
(D) Magnetic field
Option b – Speed
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Also, check out:
- Physics Class 9 ICSE Solutions Goyal Brothers Prakashan
- ICSE Class 9 Physics Sample Paper
- ICSE Class 9 Physics Question Paper
