Class 12 Physics Objective Question Answer in Hindi. We covered all the Class 12 Physics Objective Question Answer in Hindi in this post for free so that you can practice well for the exam.
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Class 12 Physics Objective Question Answer in Hindi for Students
Bernoulli's principle is based on :
(A) conservation of energy
(B) conservation of momentum
(C) conservation of mass
(D) conservation of charge
Option a - conservation of energy
Windstorm is blowing over a house. The force due to windstorm acts :
(A) in the horizontal direction
(B) upwards
(C) downwards
(D) nothing can be predicted
Option b - upwards
On what principle out of the following is the paint gun based :
(A) Boyle's law
(B) Bernoulli's principle
(C) Archimedes principle
(D) Newton's laws of motion
Option b - Bernoulli's principle
The velocity of water in a tube of diameter 0.05 m so that the flow is just turbulent is : (Viscosity of water = 0.001 Ns/m²)
(A) 0.03 m/s
(B) 0.09 m/s
(C) 0.06 m/s
(D) 0.12 m/s
Option c - 0.06 m/s
Water flows in a tube of diameter 2 cm so that the flow is streamlined. If Reynold's number is 2000 and the coefficient of viscosity of water is 10-3 kg/m s then the maximum average velocity of water is :
(A) 0.1 m/s
(B) 1 m/s
(C) 0.2 m/s
(D) 2 m/s
Option a - 0.1 m/s
A Venturi meter is used to measure :
(A) liquid pressure
(B) liquid density
(C) rate of flow of liquid
(D) surface tension
Option c - rate of flow of liquid
If two ping pong balls are suspended near each other and a fast stream of air is produced within the space of the balls, the balls :
(A) came nearer to each other
(B) move away from each other
(C) remain in their original positions
(D) move far away
Option a - came nearer to each other
Two different liquids are flowing in two tubes of equal diameter. The ratio of the coefficient of viscosity is 52 : 43 and the ratio of their densities of liquids then the ratio of their critical velocities is 13 : 1, will be :
(A) 4 : 49
(B) 2 : 7
(C) 49 : 4
(D) 7 : 2
Option a - 4 : 49
The velocity of water in a tube of diameter 2 cm, so that the flow is just laminar is : (Viscosity of water = 0.001 Ns/m²)
(A) 0.1 m/s
(B) 0.3 m/s
(C) 0.2 m/s
(D) 0.4 m/s
Option a - 0.1 m/s
In a pipe laminar (streamline) flow usually occurs if Reynold's number is :
(A) less than 2000
(B) more than 3000
(C) more than 2000
(D) upto 3000
Option c - more than 2000
For which type of liquids is the value of Reynold's number low?
(A) Low density
(B) High viscosity
(C) Low velocity
(D) All of the above
Option b - High viscosity
Doppler shift in frequency does not depend upon
(a) the frequency of the wave produced.
(b) the velocity of the source.
(c) the velocity of the observer.
(d) distance from the source to the listener.
Option d - distance from the source to the listener
Diffraction effects are more easily detected in the case of a sound wave than light waves because
(a) sound waves are longitudinal.
(b) sound waves have smaller wavelengths.
(c) sound waves have larger wavelengths.
(d) Sound waves are transverse.
Option c - sound waves have larger wavelengths
In a progressive wave,
(a) all particles of the medium vibrate.
(b) the amplitude of vibration is the same for all particles.
(c) the amplitude of vibration is different from one particle to another particle.
(d) Both (a) and (b).
Option d - Both (a) and (b)
The law of superposition is applicable to only
(a) light waves.
(b) sound waves.
(c) transverse waves.
(d) all kinds of waves.
Option d - all kinds of waves
Beats are the result of
(a) diffraction.
(b) destructive interference.
(c) constructive and destructive interference.
(d) superposition of two waves of nearly equal frequency.
Option d - superposition of two waves of nearly equal frequency
Stationary waves are so called because in them
(a) there is no flow of energy.
(b) the interference effect can't be observed.
(c) the particles of the medium are not disturbed at all.
(d) the particles of the medium do not execute SHM.
Option a - there is no flow of energy
As an empty vessel is filled with water, its frequency
(a) increases.
(b) decreases.
(c) remains the same.
(d) None of the above.
Option a - increases
The frequency (in Hz) of a note that is one octave higher than 500 Hz is
(a) 375.
(b) 750.
(c) 1000.
(d) 2000.
Option c - 1000
Absolute zero is defined as
(a) the temperature at which all molecular motion ceases.
(b) at which water boils at 298 K.
(c) at which liquid Helium boils.
(d) at which the volume becomes zero.
The direction of heat flow between two bodies depends on which of the following?
(a) Their specific heat
(b) Their latent heat
(c) Their temperatures
(d) Their area of contact
Option c - Their temperatures
How many calories are there in a Joule?
(a) 0.24
(b) 0.48
(c) 0.72
(d) 0.96
Option a - 0.24
Which one of the following statements is not correct?
(a) The Kelvin scale of temperature is called the absolute scale.
(b) Visible light radiation has a wavelength range of 400-700 nm.
(c) The capacity to do work is called power.
(d) The wavelength of Gamma rays is less than that of X-rays.
Which one of the following statements is correct?
(a) Any energy transfer that does not involve a temperature difference in some way is not heat.
(b) Any energy transfer always requires a temperature difference.
(c) On heating, the length and volume of the object remain exactly the same.
(d) Whenever there is a temperature difference, heat is the only way of energy transfer.
Option a - Any energy transfer that does not involve a temperature difference in some way is not heat
The absolute zero temperature is 0°K. In °C unit, which one of the following is the absolute zero temperature?
(a) 0°C
(b) -100°C
(c) -273.15°C
(d) -173.15°C
Option c - -273.15°C
In a pressure cooker, food is cooked in a shorter time because
(a) the boiling point of water increases.
(b) the boiling point of water decreases.
(d) None of the above
Option a - the boiling point of water increases
The boiling point of alcohol is 78°C. What is the temperature on the Kelvin scale?
(a) 78 K
(b) 314 K
(c) 373 K
(d) 351 K
Option d - 351 K
The boiling point of water is .....
(a) 210°F
(b) 212°F
(c) 214°F
(d) 208°F
Option b - 212°F
Why does the boiling point of water decrease at high altitudes?
(a) Because of high temperature
(b) Because of low atmospheric pressure
(c) Because of low temperature
(d) Because of high atmospheric pressure
Option b - Because of low atmospheric pressure
At the boiling point of liquids, its
(a) temperature increases.
(b) atmospheric pressure increases.
(c) the temperature remains constant.
(d) vapor pressure decreases.
Option c - the temperature remains constant
What is sublimation?
(a) It is the process of conversion of a liquid into a gas.
(b) It is the process of conversion of a solid into a liquid.
(c) It is the process of conversion of a solid into vapor.
(d) It is the process of conversion of a gas into a liquid.
Option c - It is the process of conversion of a solid into vapor
The cooling by a desert cooler is based on
(a) hot air replacement.
(b) air dehydration.
(c) evaporative cooling.
(d) air rehydration.
Option c - evaporative cooling
We feel cool when we sit near the fan because
(a) the fan gives cool air.
(b) the fan cools the surrounding air.
(c) air vaporizes the sweat on our bodies.
(d) we feel cool when air touches the body.
Option c - air vaporizes the sweat on our body
Supercooling stands for cooling of a liquid
(a) at the freezing point.
(b) below the freezing point.
(c) at the melting point.
(d) above the melting point.
Option b - below the freezing point
Where is a transistor most likely to be found?
(a) Wristwatch
(b) Fuse
(c) Hearing aid
(d) Fluorescent lamp
Option c - Hearing aid
NPN transistors are preferred to PNP transistors because they have
(a) low cost
(b) low dissipation energy
(c) the capability of handling large power
(d) electrons having higher mobility than holes
Option d - electrons having high mobility than holes
Which one among the following components is used as an amplifying device?
(a) Transformer
(b) Diode
(c) Capacitor
(d) Transistor
Option d - Transistor
Which among the following is most helpful in energy savings?
(a) Incandescent bulb
(b) Fluorescent tube light
(c) Compact fluorescent lamp
(d) LED bulb
Option d - LED bulb
Zener diode is used as
(a) Half-wave rectifier
(b) Full-wave rectifier
(c) AC voltage stabilizer
(d) DC voltage stabilizer
Option c - AC voltage stabilizer
Which one of the following devices changes low voltage alternating current to high voltage alternating current and vice versa?
(a) Generator
(b) Motor
(c) Transformer
(d) Vibrator
Option c - Transformer
An optical illusion that occurs mainly in deserts during hot summer is based on the principle of:
(a) Reflection
(b) Interference
(c) Dispersion
(d) Total internal reflection
Option d - Total internal reflection
At which place Earth's magnetic field becomes horizontal?
(a) Magnetic meridian
(b) Magnetic equator
(c) Geographical pole
(d) Tropic of Cancer
Option b - Magnetic equator
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
Rutherford's alpha-particle scattering experiment was responsible for the discovery of:
(a) Electron
(b) Proton
(c) Nucleus
(d) Helium
Option c - Nucleus
A Kelvin thermometer and a Fahrenheit thermometer both give the same reading for a certain sample. What would be the corresponding reading in a Celsius thermometer?
(a) 574
(b) 301
(c) 273
(d) 232
Option b - 301
An image formed by a concave mirror on a screen is called...
(a) Virtual image
(b) Real image
(c) Inverted image
(d) Erect image
Option b - Real image
The distance-time graph for the motion of an object moving with a constant speed is a...
(a) Dot
(b) Circle
(c) Straight Line
(d) Curve
Option c - Straight Line
Convex and concave mirrors are examples of:
(a) plane mirrors
(b) spherical mirrors
(c) inverted mirror
(d) erect mirror
Option b - spherical mirrors
The frictional force exerted by fluids is also called .....
(a) drag
(b) buoyancy
(c) upthrust
(d) convection
Option a - drag
In the Fraunhofer diffraction slit width 'a' is illuminated by the light of wavelength 5400 A°. The value of 'a' for the first maxima falls at an angle of diffraction of 30° will be :
(A) 1.62 μm
(Β) 5.4 mm
(C) 3 μm
(D) 10.8 μm
Option a - 1.62 μm
If a single slit Fraunhofer diffraction setup is used with the light of wavelength 4000 A°, the distance x between the central maximum and the first maximum is found to be 3 mm. In the same setup if the wavelength of light used is changed to 6000 Aº, the corresponding value of x will be :
(A) 3 mm
(B) 4.5 mm
(C) 6 mm
(D) 3.5 mm
Option b - 4.5 mm
In single slit diffraction, the second minimum for the light of wavelength 5000 A. U. coincides with the second maximum of some other light. The wavelength of light used is
(A) 4000 A. U.
(B) 5000 A. U.
(C) 5500 A. U.
(D) 6000 A. U.
Option a - 4000 A. U.
When the light of wavelength 6000 A. U. from a distance source falls on a slit 0.6 mm wide. The distance between two dark bands on each side of the central maxima of diffraction pattern observed on a screen placed 1.5 m from the slit is :
(A) 1 mm
(B) 2 mm
(C) 3 mm
(D) 4 mm
Option c - 3 mm
The dablule slit diffraction pattern is decided by
(A) the Diffraction of a single slit and interference between them.
(B) Interference of single slit and diffraction between them
(C) Interference produced by two slits only.
(D) Refraction produced by two slits
Option a - the Diffraction of a single slit and interference between them
Light of wavelength 6280 Aº passes through a single slit and a diffraction pattern is observed on the screen. The angular deflection of the 10th dark band on the side of the central maximum is 3.6°. The slit width will be :
(A) 1 mm
(B) 0.1 mm
(C) 2 mm
(D) 5 mm
Option b - 0.1 mm
The main difference in interference and diffraction is that :
(A) diffraction is due to the interaction of light from the same wavefront whereas interference is the interaction of waves from two isolated sources
(B) diffraction is due to the interaction of light from the wavefront, whereas interference is the interaction of two waves derived from the same source
(C) diffraction is due to the interaction of waves derived from the same source, whereas interference is the bending of light from the same wavefront
(D) there is no difference between interference and diffraction
Option b - diffraction is due to the interaction of light from the wavefront, whereas interference is the interaction of two waves derived from the same source
In order to see diffraction the thickness of the film is :
(A) 100 Aº
(B) 10, 000 Aº
(C) 11 mm
(D) 10 cm
Option b - 10, 000 Aº
A parallel beam of monochromatic light of wavelength 5000 Å is incident normally on a single narrow slit of width 0.001 mm. The light is focused by a convex lens on a screen placed on the focal plane. The first minimum will be formed for the angle of diffraction equal to :
(A) 0°
(B) 30⁰
(C) 15⁰
(D) 60⁰
Option b - 30⁰
A mass of 5 kg is tied to a string of length 1.0 m and rotated in a vertical circle with a uniform speed of 4 m/s. The tension in the string will be 130 N when the mass is at (g = 10 m/s²)
(A) Highest point
(B) Midway
(C) Bottom
(D) Cannot justify
Option c - Bottom
A particle of mass 100 g is tied to one end of a string of length 1m. It rotates in a vertical circle. When the string makes an angle of 60° with the vertical, its velocity is 2 m/s. The tension in the string in this position : (g = 9.8 m/s²)
(A) 0.4 N
(B) 0.09 N
(C) 0.89 N
(D) 0.98 N
Option c - 0.89 N
If a stone of mass m is rotated in a vertical circular path of radius 1 m, the critical velocity will be :
(A) 6.32 m/s
(B) 3.13 m/s
(C) 9.48 m/s
(D) 12.64 m/s
Option b - 3.13 m/s
What is the minimum velocity to be imparted to a simple pendulum so that it rises to a height of 10 cm? (g = 9.8 m/s²)
(A) 2.8 m/s
(B) 14 m/s
(C) 1.4 m/s
(D) 14 cm/s
Option c - 1.4 m/s
A ball moves along the rim of a hemispherical bowl of radius 10 cm. The velocity with which the ball passes from the lowest point is : (g = 9.8 m/s²)
(A) 14 m/s
(B) 1.4 m/s
(C) 140 m/s
(D) 0.7 m/s
Option b - 1.4 m/s
A car is moving in a circular horizontal track with a radius of 10 m, with a constant speed of 10 m/s. A bob is suspended from the roof of the car with the rod. Angle made by a rod with vertical : (g=9.8 m/s²)
(A) Zero
(B) 30°
(C) 45°
(D) 60°
Option c - 45°
For a body moving in a vertical circle of radius 1m with a speed of 5 m/s at the top. The tension at the top if the mass of a body is 2 kg is :
(A) 20.8 N
(B) 1.04 N
(C) 104 N
(D) 30.4 N
Option d - 30.4 N
In a vertical circle of radius r, at what point in its path, a particle has minimum velocity?
(A) Highest point
(B) Lowest point
(C) Any point
(D) Horizontal point
Option a - Highest point
A particle of mass m is rotating in a vertical circle with the help of a string. The difference in tension at the bottom and at the top is :
(A) 6 mg
(B) 4 mg
(C) 3 mg
(D) 2 mg
Option a - 6 mg
A can filled with water is revolved in a vertical circle of radius 9 m the water does not fall, the time period of revolution will be :
(A) 2 s
(B) 4 s
(C) 6 s
(D) 8 s
Option c - 6 s
A body of mass 2 kg is whirled in a horizontal circle by means of string at a speed of 5 rpm. Keeping the radius constant, the tension in the string is doubled, and the new speed is near:
(A) 7 rpm
(B) 14 rpm
(C) 20 rpm
(D) 28 rpm
Option a - 7 rpm
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Also, check out:
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- Zener Diode Experiment Class 12
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