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Physics Class 11 Quiz Questions for Students
The wavelength of light in water is 4000 Å and in glass is 2500 Å. What is the refractive index of glass with respect to water?
(A) 1.8
(B) 0.625
(C) 1.6
(D) 1.1
Option c – 1.6
The red light of wavelength 6400 Å in the air has a wavelength of 4000 Å in the glass. If the wavelength of violet light in air is 4400 Å, the wavelength of light in glass will be :
(A) 2750 Aº
(B) 2500 A°
(C) 3750 Aº
(D) 5000 Aº
Option a – 2750 Aº
The refractive index of glass with respect to air is 1.5 what is the refractive index of air with respect to glass? :
(A) 1.3
(B) 1
(C) 1.5
(D) 0.6667
Option d – 0.6667
The ratio of the width of the incident wavefront in air and refracted wavefront in a medium is 0.8. If the angle of incidence is 45°, the angle of refraction will be :
(A) 57° 54′
(B) 47° 54′
(C) 37° 54′
(D) 27° 54′
Option d – 27° 54′
The purity of a metal can be determined with the help of
(a) Pascal’s Law
(b) Boyle’s Law
(c) Archimedes Principle
(d) Conservation of Mass Principle
Option c – Archimedes Principle
Two pieces of different metals, when completely immersed in water, experience equal upthrust, then
(a) both pieces have the same density.
(b) both pieces have equal volume.
(c) both pieces have equal weight in the air.
(d) None of the above
Option b – both pieces have equal volume
When pressure is applied to a fluid, the pressure change is transmitted to every part of the fluid without any loss. Which of the following laws explains this phenomenon?
(a) Hooke’s Law
(b) Bernoulli’s Law
(c) Avogadro’s Law
(d) Pascal’s Law
Option d – Pascal’s Law
Hydraulic brakes used in automatic vehicles are a direct practical application of which law?
(a) Pascal’s Law
(b) Archimedes Principle
(c) Newton’s Law
(d) Boyle’s Law
Option a – Pascal’s Law
Anybody kept in a fluid experiences an upward force called …
(a) torque
(b) moment
(c) pressure
(d) upthrust
Option d – upthrust
Which of the following physicists explained the existence of Buoyant force?
(a) Archimedes
(b) Blaise Pascal
(c) Charles Augustine de Coulomb
(d) Issac Newton
Option a – Archimedes
Which law/principle states that when a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it?
(a) Boyle’s Law
(b) Charles Law
(c) Archimedes Principle
(d) Pascal’s Law
Option c – Archimedes Principle
Water rises in plant fibres due to
(a) capillarity
(b) viscosity
(c) fluid pressure
(d) osmosis
Option a – capillarity
If the liquid level falls in a capillary then the radius of the capillary will
(a) increase
(b) decrease
(c) remain unchanged
(d) None of the above
Option a – increase
Cohesive force is experienced between
(a) magnetic substances
(b) molecules of different substances
(c) molecules of the same substance
(d) None of the above
Option c – molecules of the same substance
Writing on a blackboard with a piece of chalk is possible due to the property of
(a) adhesive force
(b) cohesive force
(c) surface tension
(d) viscosity
Option b – cohesive force
A liquid does not wet the sides of a solid if the angle of contact is
(a) zero
(b) obtuse (more than 90 degrees)
(c) acute
(d) 90 degrees
Option b – obtuse (more than 90 degrees)
When the temperature increases, the angle of contact of the liquid
(a) decreases
(b) increases
(c) remains the same
(d) None of the above
Option a – decreases
The excess pressure inside a dropper bubble is
(a) directly proportional to its radius
(b) inversely proportional to its surface tension
(c) directly proportional to its mass
(d) inversely proportional to its radius
Option d – inversely proportional to its radius
Two capillary tubes of different diameters are dipped in water. The rise of water is
(a) the same in both tubes
(b) greater in the tube of smaller diameter
(c) greater in the tube of larger diameter
(d) None of the above
Option b – greater in the tube of smaller diameter
The velocity of a particle performing simple harmonic motion when it passes through its mean position is
(a) infinity
(b) zero
(c) minimum
(d) maximum
Option d – maximum
Oscillatory motion is that motion
(a) in which a body moves to and fro.
(b) in which a body moves in a straight line.
(c) in which a body moves in a parabolic path.
(d) None of the above
Option a – in which a body moves to and fro
The maximum distance of the particle from the fixed point or mean position is called
(a) amplitude
(b) frequency
(c) wavelength
(d) time period
Option a – amplitude
Which of the following is an example of simple harmonic motion?
(a) Earth spinning on its axis.
(b) Simple pendulum motion.
(c) Ball bouncing on the floor.
(d) Motion of a ceiling fan.
Option b – Simple pendulum motion
A particle is executing simple harmonic motion. Which one of the following statements about the acceleration of the oscillating particle is true?
(a) It is always in the opposite direction to velocity.
(b) It is proportional to the frequency of oscillation.
(c) It is minimum when the speed is maximum.
(d) It decreases as the potential energy increases.
Option c – It is minimum when the speed is maximum
A particle is moving in a circle with uniform speed. Its motion is
(a) periodic and simple harmonic.
(b) periodic but not simple harmonic.
(c) aperiodic.
(d) None of the above
Option b – periodic but not simple harmonic
The time period of a simple pendulum made by using a thin copper wire of length L is T. Suppose the temperature of the room in which this simple pendulum is placed increases by 30°C. What will be the effect on the time period of the pendulum?
(a) T will increase slightly.
(b) T will remain the same.
(c) T will decrease slightly.
(d) T will become more than 2 times.
Option a – T will increase slightly
In simple harmonic motion, acceleration is at
(a) amplitude
(b) equilibrium
(c) acceleration is constant
(d) None of the above
Option a – amplitude
The restoring force of SHM is maximum when the particle
(a) displacement is maximum.
(b) is halfway between the mean and extreme position.
(c) crosses the mean position.
(d) is at rest.
Option a – displacement is maximum
The time period of a second pendulum is
(a) 1 second
(b) 2 seconds
(c) 0.5 seconds
(d) 1.5 seconds
Option b – 2 seconds
If T is the time period of an oscillating pendulum, then which one of the following statements is not correct?
(a) The motion repeats after time T only once.
(b) T is the least time after which motion repeats itself.
(c) The motion repeats itself after nT, where n is a positive integer.
(d) T remains the same only for small angular displacements.
Option a – The motion repeats after time T only once
The period of a simple pendulum is doubled when
(a) its length is doubled.
(b) the mass of the bob is doubled.
(c) its length is made four times.
(d) the mass of the bob and the length of the pendulum are doubled.
Option c – its length is made four times
Ultrasonic waves are produced by making use of
(a) ferromagnetic material
(b) ferrimagnetic material
(c) piezoelectric material
(d) pyroelectrical material
Option c – piezoelectric material
Which one of the following statements is not correct?
(a) Sound waves in gases are longitudinal in nature.
(b) Sound waves having a frequency below 20 Hz are known as ultrasonic waves.
(c) Sound waves with higher amplitudes are louder.
(d) Sound waves with high audible frequencies are sharp.
Option b – Sound waves having a frequency below 20 Hz are known as ultrasonic waves
Sound of frequencies below 20 Hz are called
(a) infrasonic sound
(b) ultrasonic sound
(c) intrasonic sound
(d) reflected sound
Option a – infrasonic sound
Which one of the following frequency ranges is sensitive to human ears?
(a) 0-200 Hz
(b) 20-20000 Hz
(c) 200-20000 Hz
(d) 2000-20000 Hz
Option b – 20-20000 Hz
The frequency of ultrasonic waves is
(a) less than 20 Hz
(b) between 20 Hz and 2 kHz
(c) between 2 kHz and 20 kHz
(d) greater than 20 kHz
Option d – greater than 20 kHz
Compared to audible sound waves, ultrasound waves have ( sl arora physics class 11 solutions )
(a) higher speed
(b) higher frequency
(c) Both (a) and (b)
(d) long wavelength
Option b – higher frequency
What is called the sound wave above the frequencies of 30,000 Hz?
(a) ultrasound
(b) Infrasound
(c) hypersonic sound
(d) No option is correct
Option a – ultrasound
Calculate the time period (in seconds) of a sound wave with a wavelength of 5 meters traveling at a speed of 500 m/s.
(a) 0.01
(b) 2500
(c) 0.02
(d) 250
Option a – 0.01
Which one of the following statements is not correct?
(a) Ultrasonic waves cannot get reflected, refracted, or absorbed.
(b) Ultrasonic waves are used to detect the presence of defects like cracks, porosity, etc., in the internal structure of common structural materials.
(c) Ultrasonic waves can be used for making holes in very hard materials like diamonds.
(d) Ultrasonic waves cannot travel through a vacuum.
Option a – Ultrasonic waves cannot get reflected, refracted, or absorbed
Bats detect obstacles in their path by receiving the reflected
(a) infrasonic waves
(b) ultrasonic waves
(c) radio waves
(d) microwaves
Option b – ultrasonic waves
The speed of sound is faster in
(a) solids
(b) liquids
(c) gases
(d) vacuum
Option a – solids
The sound will have the highest velocity in ( sl arora physics class 11 solutions )
(a) vacuum
(b) air
(c) water
(d) steel
Option d – steel
At 20°C, the speed of sound in water is approximately
(a) 330 m/s
(b) 800 m/s
(c) 1500 m/s
(d) 5000 m/s
Option c – 1500 m/s
Which one of the following statements is correct?
(a) The speed of sound waves in a medium depends upon the elastic property of the medium, but not on an inertia property.
(b) The speed of sound waves in a medium depends upon the inertia property of the medium, but not on an elastic property.
(c) The speed of sound waves in all mediums depends neither on its elastic property nor on its inertia property.
(d) The speed of sound waves in a medium depends on both the elastic and inertia properties of the medium.
Option d – The speed of sound waves in a medium depends on both the elastic and inertia properties of the medium
The speed of a body that has a Mach number more than 1 is
(a) supersonic
(b) subsonic
(c) 300 m/s
(d) about 10 m/s
Option a – supersonic
Sound moves with a higher velocity if
(a) the pressure of the medium is decreased.
(b) the temperature of the medium is increased.
(c) humidity of the medium is increased.
(d) Both (b) and (c)
Option d – Both (b) and (c)
A bomb explodes on the moon. You will hear its sound on earth after ……
(a) 20 minutes
(b) 2 hours 20 minutes
(c) 3.7 hours
(d) you cannot hear the sound of the explosion
Option d – you cannot hear the sound of the explosion
Sound is heard over longer distances on rainy days because ( sl arora physics class 11 solutions )
(a) sound travels slowly in moist air.
(b) sound travels faster in moist air.
(c) moist air does not absorb sound.
(d) moist air absorbs sound.
Option b – sound travels faster in moist air
Which one of the following statements is correct? The velocity of sound
(a) does not depend upon the nature of the media.
(b) is maximum in gases and minimum in liquids.
(c) is maximum in solids and minimum in liquids.
(d) is maximum in solids and minimum in gases.
Option d – is maximum in solids and minimum in gases
Which of the following statements is true? The velocity of sound is
(a) less in summer than in winter.
(b) more in summer than in winter.
(c) independent of seasons.
(d) the same in winter and summer.
Option b – more in summer than in winter
Due to which phenomena is sound heard at a longer distance at night than during the day?
(a) Reflection
(b) Refraction
(c) Interference of sound
(d) Diffraction of sound
Option b – Refraction
A person rings a metallic bell near a strong concrete wall. He hears the echo after 0.3 s. If the sound moves with a speed of 340 m/s, how far is the wall from him?
(a) 102 m
(b) 11 m
(c) 51 m
(d) 30 m
Option c – 51 m
An echo is heard after 5 s of the production of sound, which moves with a speed of 340 m/s. What is the distance of the mountain from the source of sound that produced the echo?
(a) 0.085 km
(b) 0.85 km
(c) 0.17 km
(d) 1.7 km
Option c – 0.85 km
The full form of SONAR is
(a) Sonographic Navigation And Radiation
(b) Sound Navigation And Ranging
(c) Sonographic Navigation Around Radiation
(d) Sonographic Navigation and Auto Ranging
Option b – Sound Navigation And Ranging
SONAR is based on the principle of ( sl arora physics class 11 solutions )
(a) resonance
(b) reverberation
(c) echo
(d) None of the above
Option c – echo
Which one of the following statement(s) is/are not correct?
(a) The response of the ear to the sound of increasing intensity is approximately logarithmic.
(b) The sensitivity of the human ear does not vary with the frequency of the sound.
(c) When two or more waves traverse the same medium, the displacement of any element of the medium is the algebraic sum of the displacements due to each wave.
(d) Longitudinal waves can travel in all media; solids, liquids, and gases.
Option b – The sensitivity of the human ear does not vary with the frequency of the sound
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