Class 11 ISC Physics Solutions. We covered all the Class 11 ISC Physics Solutions in this post for free so that you can practice well for the exam.
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Class 11 ISC Physics MCQs for Students
The force constant of SHM is measured in
(A) Nm
(B) N/m
(C) N
(D) m/N
Option b – N/m
A particle executes SHM of amplitude 2 cm. At the extreme position the force is 4 N. At a point midway between the mean and extreme position the force is :
(A) 2 N
(B) 3 N
(C) 4 N
(D) 6 N
Option a – 2 N
A particle executes SHM of time period 8 s and amplitude 4 cm. Find the speed of a particle 2s after it passes through mean position :
(A) Zero
(B) 8 cm/s
(C) 12.56 cm/s
(D) 6.28 cm/s
Option a – Zero
A body of mass 0.1 kg is undergoing SHM of amplitude 1 m and period 0.2 s. What is the maximum force acting on it?
(A) 9.87 N
(B) 987 N
(C) 98.7 N
(D) 49.3 N
Option c – 98.7 N
When a mass undergoes simple harmonic motion there is always a constant ratio between its displacement and :
(A) Period
(B) Acceleration
(C) Mass
(D) Velocity
Option b – Acceleration
A weight suspended from a spring oscillates up and down. The acceleration of the weight is zero at
(A) Highest point
(B) Lowest point
(C) Middle point
(D) Middle of amplitude
Option c – Middle point
The necessary and sufficient condition for a motion to be simple harmonic is :
(A) Acceleration should be constant
(B) The acceleration should be proportional to the displacement from the equilibrium position
(C) The acceleration should be directed toward the equilibrium position
(D) Both ‘2’ and ‘3’
Option d – Both ‘2’ and ‘3’
If a hole is bored along the diameter of the earth and the stone is dropped into the hole :
(A) The stone reaches the center of the earth and stops there
(B) The stone reaches the other side of the earth and stops there
(C) The stone executes SHM about the center of the earth
(D) Stone reaches the other side of the earth and escapes into the space
Option c – The stone executes SHM about the center of the earth
In periodic motion :
(A) the Speed of the particle is always constant
(B) the Speed of the particle is not constant
(C) the Speed of the particle may very or remains constant
(D) The velocity remains constant
Option c – the Speed of the particle may very or remains constant
What determines the frequency of natural oscillations of the system?
(A) Inertia alone
(B) Elasticity alone
(C) Both inertia and elasticity
(D) Neither inertia nor elasticity
Option c – Both inertia and elasticity
The motion of a simple pendulum is SHM because
(A) It is simple to construction
(B) It oscillates in a simple way
(C) Its acceleration is proportional to the displacement from the mean position
(D) It depends on the mass of the body
Option c – Its acceleration is proportional to the displacement from the mean position
Equinox means the day on which:
a. Duration of day and night are the same
b. An eclipse occurs
c. Duration of the day is greater
d. The duration of the night is greater
Option b – An eclipse occurs
The value of G depends upon:
a. The masses of bodies
b. The medium between the bodies
c. The temperature of bodies
d. None
Option d – None
The force of attraction between two unit point masses separated by unit distance is called:
a. Gravitational field strength
b. Gravitational potential
c. Acceleration due to gravity
d. Universal Gravitational constant
Option d – Universal Gravitational constant
A 1200 kg car going 30 m/s applies its brakes and skids to rest. If the friction force between the sliding tires and the pavement is 6000 N, how far does the car skid before coming to rest:
a. 45 meters
b. 65 meters
c. 90 meters
d. 101 meters
Option c – 90 meters
The heliocentric theory was proposed by:
a. Ptolemy
b. Socrates
c. Newton
d. Copernicus
Option d – Copernicus
Harmonic law is the name of:
a. Newton’s law of gravitation
b. Kepler’s 1st law
c. Kepler’s 2nd law
d. Kepler’s 3rd law
Option d – Kepler’s 3rd law
The curl of a central force is:
a. Greater than 0
b. Equal to 0
c. Less than 0
d. Not defined
Option b – Equal to 0
Force on current-carrying conductor kept parallel to the magnetic field is ….
(A) zero
(B) maximum
(C) infinity
(D) varying
Option a – zero
Force on the current carrying conductor of length 2m kept inclined at 30° with the magnetic field of induction 4T and carrying current 4A is :
(A) 4 N
(B) 8 N
(C) 12 N
(D) 16 N
Option d – 16 N
A wire of length 1.5 m carrying current 10A kept in uniform magnetic field 2T, experiences a force of 15N. The direction of the conductor with a magnetic field makes an angle :
(A) 30°
(B) 60°
(C) 45°
(D) 90°
Option a – 30°
A +ve charge moves vertically upwards in a magnetic field directed towards the north. Force on charge will be towards
(A) north
(B) east
(C) west
(D) downward
Option c – west
For deflection of the magnetic needle due to the current carrying a straight conductor, the axis of the needle is placed :
(A) parallel to conductor
(B) perpendicular to the conductor
(C) in any direction
(D) in any direction except perpendicular
Option d – in any direction except perpendicular
The direction of the force on the current-carrying conductor in a magnetic field is given by :
(A) Fleming’s right-hand rule
(B) right-hand palm rule
(C) Flemings’s left-hand rule
(D) right-hand screw rule
Option c – Flemings’s left-hand rule
Two charges +q and -q are attached to the two ends of a light rod of length L. The system is given a velocity of v perpendicular to magnetic field 3. The magnetic force on the system of charges and magnitude of the force on one charge are respectively :
(A) Zero, zero
(B) Zero, qvB
(C) 2qvB, zero
(D) 2qvB, qvB
Option b – Zero, qvB
An elastic circular wire of length 1 carries a current I in an anticlockwise direction. It is placed in a uniform magnetic field B (out of paper) such that is perpendicular to the direction of B. it’s plane The wire will experience :
(A) No force
(B) A stretching force
(C) A compressive force
(D) A torque
Option b – A stretching force
The force experienced by charge particles in a magnetic field is :
(A) Fleming’s force
(B) Lorentz’s force
(C) Oersted’s force
(D) Faraday’s force
Option b – Lorentz’s force
Earth’s magnetic field always has a horizontal component except at
(A) The geographical center
(B) The magnetic poles of Earth
(C) The magnetic equator
(D) Latitude of 60⁰
Option b – The magnetic poles of Earth
Energy resides in a current-carrying inductor in the form of :
(A) Magnetic field
(B) Mechanical work
(C) Electrostatic field
(D) Gravitational field
Option a – Magnetic field
Corresponding to Maxwell, the unit of magnetic flux in the SI system is :
(A) Weber
(B) Tesla
(C) Henry
(D) Gauss
Option a – Weber
If the direction of the electric current is reversed, the direction of the magnetic field will :
(A) Remain the same
(B) Reversed
(C) Make an angle
(D) Either (A) or (C)
Option b – Reversed
Magnetic field B due to a current element at all points on the axis of the element is :
(A) Zero
(B) Minimum
(C) Maximum
(D) Infinite
Option a – Zero
The energy resides in a current-carrying conductor in the form of :
(A) Magnetic field
(B) Mechanical work
(C) Electrostatic field
(D) Gravitational field
Option a – Magnetic field
Current carrying conductor produces magnetic field is discovered by :
(A) Newton
(B) Oersted
(C) Joule
(D) Faraday
Option b – Oersted
Magnetic induction can not be measured in
(A) Wb/m²
(B) T
(C) N/Am
(D) Wb/m
Option d – Wb/m
Which of the following is not the unit of magnetic induction?
(A) Maxwell
(B) Gauss
(C) Oersted
(D) Wb/m²
Option a – Maxwell
The direction of the magnetic field produced by the current-carrying conductor is given by :
(A) Fleming’s left-hand rule
(B) Fleming’s right-hand rule
(C) right-hand thumb rule
(D) right-hand palm rule
Option c – right-hand thumb rule
Magnetic induction is a :
(A) vector quantity
(B) a tensor quantity
(C) a scalar quantity
(D) product of scalar and vector
Option a – vector quantity
The magnetic field can be produced by :
(A) stationary charge
(B) moving charge
(C) both stationary and moving charge
(D) a neither stationary nor moving charge
Option b – moving charge
The magnetic field is nothing but :
(A) the magnetic flux per unit area
(B) the electric flux per unit area
(C) magnetic flux normally passing per unit area
(D) permeability of the medium
Option c – magnetic flux normally passing per unit area
The magnetic field is measured in
(A) Wb/m²
(B) Wb/Am
(C) Wb
(D) Wb/m
Option a – Wb/m²
In the interference experiment with a biprism, the distance of the slits from the screen is increased by 10% and the separation of the slits is decreased by 20%. The percentage change in fringe width is :
(A) 25%
(B) 30%
(C) 37.5%
(D) 62.5%
Option c – 37.5%
In Young’s experiment, the angular width of a fringe formed on a distant screen is 2°. The wavelength of light used is 6500 A°. The spacing between the slits is approximate:
(A) 1.862 mm
(B) 18.62 mm
(C) 0.1862 mm
(D) 0.01862 mm
Option d – 0.01862 mm
A beam of light of wavelength 600nm from a distant source falls on a single slit 1mm wide and the resulting diffraction pattern is observed on a screen 2m away. The distance between the first dark fringes on either side of the central bright fringe is :
(A) 24 mm
(B) 2.4 mm
(C) 1.2 mm
(D) 12 mm
Option b – 2.4 mm
A point is situated at 8.55 cm and 8.7 cm from two sources. The nature of illumination at that point, if the wavelength of light is 6000 Aº, will be :
(A) Dark
(B) Bright
(C) Neither bright nor dark
(D) Both (A) and (B)
Option b – Bright
In Fraunhofer diffraction, due to a single slit, the light used is of wavelength 6000 A°. If the direction in which the fifth dark band occurs makes an angle of 6° 54′ with the plane of the slit, the width of the slit is :
(A) 2.5 cm
(B) 0.5 mm
(C) 0.25 mm
(D) 0.025 mm
Option d – 0.025 mm
The limit of resolution of a microscope that has a numerical aperture of the objective 0.12 will be (λ = 5800 A°) :
(A) 4 µm
(Β) 2.416 μm
(C) 3.416 μm
(D) 6 μm
Option b – 2.416 μm
In a biprism experiment, the slit is illuminated with light of wavelength 5000 A°. How many fringes will pass a point on the screen, if the path difference is altered by 0.05 mm?
(A) 10
(B) 100
(C) 5
(D) 50
Option b – 100
In a biprism experiment, 60 fringes are observed with sodium light of wavelength 6000 A°. Keeping the same arrangement, if sodium light is replaced by the green light of wavelength 5000 Aº, how many fringes will be then observed?
(A) 67
(B) 69
(C) 72
(D) 74
Option c – 72
For the same angle of incidence, the angles of refraction in media ‘P’, ‘Q’, ‘R’, and ‘S’ are 50°, 40°, 30°, and 20° respectively. The speed of light is minimum in medium :
(A) P
(B) Q
(C) R
(D) S
Option d – S
Two points separated by a distance of 0.1mm can just be inspected in a microscope when the light of wavelength 6000 A is used. If the light of wavelength 4800 A° is used, the limit of resolution will become :
(A) 0.8 mm
(B) 0.15 mm
(C) 0.08 mm
(D) 0.85 mm
Option c – 0.08 mm
Two interfering beams have intensities in the ratio of 9 : 4. Then, the ratio of maximum to minimum intensity in the interference pattern is :
(A) 9 : 4
(B) 6 : 4
(C) 25 : 1
(D) 5 : 1
Option c – 25 : 1
In Y. E., to obtain interference fringes, the light used consists of two wavelengths 5200 A and 6500 A°. The distance between the two slits is 2 mm and the distance between the plane of the slits and the screen is 2 m. What is the least distance from the central bright band, where the bright bands due to the two wavelengths overlap?
(A) 2.6 mm
(B) 1.56 mm
(C) 5.3 mm
(D) 1.6 mm
Option a – 2.6 mm
In a biprism experiment, the slit and eyepiece are 10 cm and 80 cm away from the biprism when a convex lens was interposed at 40 cm from the slit, the separation of two magnified images of the slit was found to be 4 mm, and the distance between two virtual images will be :
(A) 1.6 mm
(B) 2 mm
(C) 3.2 mm
(D) 5 mm
Option c – 3.2 mm
A ray of light is incident on a glass slab with a refractive index of 1.5 making an angle of 40° with the surface. The angle of refraction in glass is
(A) 30° 42′
(B) 35° 42′
(C) 19° 28′
(D) 35° 36′
Option a – 30° 42′
A ray of light is incident on the surface of a glass plate of refractive index 1.55 at the polarising angle. The angle of refraction is
(A) 32° 49′
(B) 35° 16′
(C) 159 49′
(D) 67°
Option a – 32° 49′
When a source of light is receding away from an observer, then the spectral lines will get displaced towards
(A) violet region
(B) blue region
(C) ultraviolet region
(D) red region
Option d – red region
Two mirrors are placed perpendicular to each other. A ray strikes the first mirror and after reflection from the first mirror it falls on the second mirror. The ray after reflection from the second mirror will emerge :
(A) perpendicular to the original ray
(B) parallel to the original ray
(C) at 45° to the original ray
(D) at 60° to the original ray
Option b – parallel to the original ray
Two Nicol prisms are placed with their principal planes at 60°. What percentage of light incident on the combination is transmitted?
(A) 10 %
(B) 25 %
(C) 12.5 %
(D) 70 %
Option c – 12.5 %
Air has a refractive index of 1.0003. The thickness of the air column which will have one more wavelength of yellow light (6000 A° ) than in the same thickness of vacuum is :
(A) 1 mm
(B) 3 mm
(C) 2 mm
(D) 4 mm
Option c – 2 mm
An air bubble inside a glass slab appears to be 6 when viewed from one side and 4 cm deep when viewed from the opposite side. If the refractive deep glass is 1.5, then the thickness of the glass index of the slab is :
(A) 9 cm
(B) 15 cm
(C) 6 cm
(D) 3 cm
Option b – 15 cm
Light of a certain wavelength is incident normally on a glass plate of thickness 6 cm and refractive index of 1.5. The light takes the same time to travel from the source to the incident surface as it takes to travel through the slab. What is the distance of the source from an incident surface :
(A) 8 cm
(B) 9 cm
(C) 10 cm
(D) 11 cm
Option b – 9 cm
A ray of light is incident on a glass block such that the reflected ray is completely polarised. The refracted beam suffers a deviation of 26° from its original path in the air. What is the refractive index for glass?
(A) 1.33
(B) 1.6
(C) 2.4
(D) 1.875
Option b – 1.6
The refractive index of glass and that of water are 3/2 and 4/3 respectively. By what fraction would the wavelength of light change if it goes from glass to water :
(A) 1.25
(B) 0.125
(C) 3.25
(D) 1.43
Option b – 0.125
Light of a certain wavelength is incident on a glass slab of refractive index 1.6 making an angle of incidence 50°. If the thickness of the glass is 3 cm, what is the distance it will cover in glass :
(A) 4 cm
(B) 3 cm
(C) 4.619 cm
(D) 3.416 cm
Option d – 3.416 cm
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