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Stalin Malhotra Physics Class 9 MCQs for Students
Lloyd’s mirror is used to produce two sources which are
(A) monochromatic
(B) coherent
(C) polarized
(D) linear
Option b – coherent
In a biprism experiment, the light of wavelength 5200 Aᵒ is used to get interference patterns on a screen. Fringe width changes by 1.3 mm when the screen is brought towards the biprism by 50 cm. The distance between the virtual images of the slit will be :
(A) 3mm
(B) 2mm
(C) 0.3mm
(D) 0.2mm
Option d – 0.2mm
In Young’s experiment fringe width is 0.4 mm when the eyepiece is at a distance of 1m away from the slit. The change in fringe width if the eyepiece is moved through a distance of 25 cm towards the biprism :
(A) 0.3 mm
(B) 0.1 mm
(C) 0.5 mm
(D) 1 mm
Option b – 0.1 mm
In a biprism experiment, the eyepiece is kept at a distance of 1.5m from the slit. The distance of the second dark band from the central is 1.2 mm. The size of magnified and diminished images of the slits produced by the convex lens is found to be 2.4 mm and 0.6 mm respectively. The wavelength of light used is :
(A) 5400 A°
(B) 4400 A°
(C) 6400 A°
(D) 5900 A°
Option c – 6400 A°
In the biprism experiment, the fringe width is 0.58 mm when the eyepiece is at 1 m from the slit. A convex lens is now placed between the biprism and the eyepiece at a distance of 60 cm from the eyepiece, the distance between the two virtual images was found to be 1.5 mm. The wavelength of light used is :
(A) 2800 Aº
(B) 3795 A°
(C) 5800 Aº
(D) 6800 Aº
Option c – 5800 Aº
In a Fresnel biprism experiment, the two positions of the lens give separation between the slits is 16mm and 9 mm respectively. What is the actual distance of separation?
(A) 144 mm
(B) 16/9 mm
(C) 9/10 mm
(D) 12 mm
Option d – 12 mm
In a biprism experiment, the distance between the slit and the screen is 1m and the distance between the slits is 0.3mm. If λ = 5400 A, the distance between the center of a bright band and the center of an adjacent dark band is :
(A) 0.9 mm
(B) 0.18 mm
(C) 1.8 mm
(D) 9 mm
Option a – 0.9 mm
In a biprism experiment, the distance between the slit and screen is 0.8m and λ = 5400 A°. If the distance of the fifth dark band from the central bright band is 2.16 mm, what is the distance between the two virtual images of the slit formed by the biprism?
(A) 0.9 mm
(B) 0.18 mm
(C) 1.8 mm
(D) 9 mm
Option a – 0.9 mm
In a biprism experiment, the distance between the slit and biprism is 10 cm and the distance between two virtual images of the slit is 1 mm. If the fringe width is 0.54 mm, the distance of the eyepiece from the biprism will be (λ = 5400 A°) :
(A) 1m
(B) 10 cm
(C) 90 cm
(D) 9m
Option c – 90 cm
In a biprism experiment, the distance of the 30th bright band from the center of the interference pattern is 12 mm. The distance of the 20th bright band from the central bright band will be :
(A) 4 mm
(B) 8 mm
(C) 12 mm
(D) 14 mm
Option b – 8 mm
Which one of the following statements is not correct for light rays?
(a) Light travels at different speeds in different media.
(b) Light travels at almost 300 million meters per second in air.
(c) Light slows down as it leaves a water surface and enters the air.
(d) Light speeds up as it leaves a glass surface and enters the air.
Option c – Light slows down as it leaves a water surface and enters the air
A glass prism splits white light into different colors. This phenomenon is called the dispersion of light by a prism. Which one of the following statements is correct?
(a) Red light will deviate the most, and it is because of the reflection of light.
(b) Violet light will deviate the most, and it is because of the refraction of light.
(c) Red light will deviate the most, and it is because of the refraction of light.
(d) Violet light will deviate the most, and it is because of the reflection of light.
Option b – Violet light will deviate the most, and it is because of the refraction of light
When light is scattered by a molecule, and the frequency of the scattered light is changed, this phenomenon is called:
(a) Rayleigh scattering
(b) Raman effect
(c) Photoelectric effect
(d) Rutherford scattering
Option b – Raman effect
‘Beats’ is a phenomenon that occurs when frequencies of two harmonic waves are:
(a) equal
(b) far apart
(c) multiples of each other
(d) nearly the same
Option d – nearly the same
Which one of the following is the lowest possible temperature?
(a) 0° Celsius
(b) -73° Celsius
(c) -173° Celsius
(d) -273° Celsius
Option d – -273° Celsius
Numerically, two thermometers, one on the Fahrenheit scale and another on the Celsius scale shall read the same at:
(a) -40°
(b) 0°
(c) -273°
(d) 100°
Option a – -40°
Which one of the following colors may be obtained by combining green and red colors?
(a) Blue
(b) Magenta
(c) Pink
(d) Yellow
Option d – Yellow
Fundamental laws of physics require:
(a) Conservation of energy and non-conservation of charge.
(b) Conservation of charge and non-conservation of linear momentum.
(c) Conservation of charge and non-conservation of energy.
(d) Conservation of energy, momentum, and charge.
Option d – Conservation of energy, momentum, and charge
A uniform motion of a car along a circular path experiences:
(a) A change in speed due to a change in its direction of motion.
(b) A change in velocity due to a change in its direction of motion.
(c) A change in momentum due to no change in its direction of motion.
(d) A constant momentum due to a change in its direction of motion.
Option b – A change in velocity due to a change in its direction of motion
Rutherford’s alpha-particle (á) scattering experiment was responsible for the discovery of which one of the following?
(a) Electron
(b) Proton
(c) Atomic Nucleus
(d) Neutron
Option c – Atomic Nucleus
Imagine a current-carrying straight conductor with magnetic field lines in an anti-clockwise direction. Then the direction of the current is determined by:
(a) The Right-Hand Thumb rule and it would be in the downward direction.
(b) The Left-Hand Thumb rule and it would be in the downward direction.
(c) The Right-Hand Thumb rule and it would be in the upward direction.
(d) The Left-Hand Thumb rule and it would be in the upward direction.
Option c – The Right-Hand Thumb rule and it would be in the upward direction
Spherical mirror formula relating an object distance ‘u’, image distance ‘v’, and the focal length of the mirror ‘f’ may be applied to a plane mirror when:
(a) Focal length goes to infinity.
(b) Focal length goes to zero.
(c) Image distance goes to zero.
(d) Image distance goes to infinity.
Option a – Focal length goes to infinity
Reverberation is a phenomenon associated with:
(a) Multiple refraction of sound.
(b) Multiple reflections of sound.
(c) Single refraction of sound.
(d) Single reflection of sound.
Option a – Multiple refraction of sound
Buoyancy is a/an:
(a) Upward pressure
(b) Downward pressure
(c) Downward force
(d) Upward force
Option d – Upward force
Tyndall effect is a phenomenon of:
(a) Scattering of light by the colloidal particles.
(b) Refraction of light by the colloidal particles.
(c) Dispersion of light by dust particles.
(d) Refraction of light by dust particles.
Option a – Scattering of light by the colloidal particles
Refraction of light, as it enters from a transparent medium to another, is due to:
(a) Change in temperature of the media.
(b) Change in the amplitude of light.
(c) Change in speed of light.
(d) Internal property of light.
Option c – Change in speed of light
The unit of the ratio between thrust and impulse is the same as that of:
(a) Frequency
(b) Speed
(c) Wavelength
(d) Acceleration
Option a – Frequency
When a light beam falls on a triangular glass prism, a band of colors is obtained. Which one of the following statements is correct in this regard?
(a) Red light bends the most, as the refractive index of glass for red light is greatest.
(b) Red light bends the most, as the refractive index of glass for red light is the lowest.
(c) Violet light bends the most, as the refractive index of glass for violet light is the greatest.
(d) Violet light bends the most, as the refractive index of glass for violet light is the lowest.
Option c – Violet light bends the most, as the refractive index of glass for violet light is the greatest
The image of an object formed by a plane mirror is:
(a) Erect, real, and larger.
(b) Erect, virtual, and the same size.
(c) Inverted, virtual, and the same size.
(d) Inverted, real, and smaller.
Option b – Erect, virtual, and the same size
Which one of the following is not a conservative force?
(a) Frictional force
(b) Electric force
(c) Gravitational force
(d) Spring force
Option a – Frictional force
A negative work is done when an applied force F and the corresponding displacement S are:
(a) Perpendicular to each other.
(b) Parallel to each other.
(c) Anti-parallel to each other.
(d) Equal in magnitude.
Option c – Anti-parallel to each other
Where should an object be placed in front of a convex lens to get a real and enlarged image of the object?
(a) At twice the focal length
(b) At infinity
(c) Between the principal focus and twice the focal length
(d) Beyond twice the focal length
Option c – Between the principal focus and twice the focal length
A ray of light traveling from a rarer medium to a denser medium:
(a) Slows down and bends away from the normal
(b) Slows down and bends towards the normal
(c) Speeds up and bends away from the normal
(d) Speeds up and bends towards the normal
Option b – Slows down and bends towards the normal
What is the effect of the pressure of a human body on sand?
(a) Larger while standing than while lying
(b) Smaller while standing than while lying
(c) Same while standing or lying
(d) Larger while standing during the daytime and smaller during the nighttime while lying
Option a – Larger while standing than while lying
An electron and a photon have the same de Broglie wavelength. It implies that they have the same:
(a) Linear momentum
(b) Energy
(c) Speed
(d) Angular momentum
Option a – Linear momentum
Oil and water do NOT mix because of the property of:
(a) Bulk modulus
(b) Shear strain
(c) Volume effect
(d) Surface tension
Option d – Surface tension
Which one of the following statements on the photoelectric effect is NOT correct?
(a) Albert Einstein received the Nobel Prize in Physics for explaining the photoelectric effect
(b) For each metal, there is a threshold frequency vo below which this effect is not observed
(c) At a frequency v > vo, the kinetic energy of ejected electrons does not change on increasing the frequency of incident light
(d) The number of electrons ejected is proportional to the intensity of incident light
Option c – At a frequency v > vo, the kinetic energy of ejected electrons does not change on increasing the frequency of incident light
Which one of the following statements regarding motion is correct?
(a) All the periodic motions are necessarily simple harmonic
(b) All the simple harmonic motions are necessarily periodic motions
(c) There is no correlation between the simple harmonic motions and the periodicity of motion
(d) The relation between the simple harmonic motion and periodic motion depends upon the mass of the object undergoing the motion
Option c – There is no correlation between the simple harmonic motions and the periodicity of motion
The radar used by police to check over-speeding vehicles works on the principle of:
(a) Raman effect
(b) Induction effect
(c) Doppler effect
(d) Coulomb effect
Option d – Coulomb effect
Which one of the following statements with regard to Newton’s third law of motion is not correct?
(a) Force never occurs singly in nature
(b) When the earth pulls a stone downwards due to gravity, the stone exerts a force on the earth
(c) There is a cause-effect relation implied in the third law
(d) There is no cause-effect relation implied in the third law
Option d – There is no cause-effect relation implied in the third law
Two magnetic field lines produced by the same source:
(a) never intersect
(b) can originate from the same point
(c) can terminate at the same point
(d) can intersect depending on the situation
Option a – never intersect
Which one of the following statements regarding Fleming’s Rule is correct?
(a) Fleming’s left-hand rule gives the direction of force on a current-carrying conductor in a magnetic field
(b) Fleming’s right-hand rule gives the direction of force on a current-carrying conductor in a magnetic field
(c) Both the left-hand and right-hand rules can be used for finding the direction of force on a current-carrying conductor in a magnetic field
(d) Fleming’s rule has nothing to do with the magnetic field
Option b – Fleming’s right-hand rule gives the direction of force on a current-carrying conductor in a magnetic field
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