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12th Physics One Mark Online Test. We covered all the 12th physics book back one mark online test in this post for free so that you can practice well for the exam.
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12th Physics Practice MCQs for Students
Quick Quiz
What will be the ratio of temperatures of the sun and moon if the wavelengths of their maximum emission radiations are 140 A and 4200 Aº respectively?
(A) 1:30
(B) 30 : 1
(C) 42:14
(D) 14:42
Option b – 30 : 1
A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using ( 12th Physics One Mark Online Test )
(A) Wien’s displacement Law
(B) Kirchoff’s Law
(C) Newton’s Law of Cooling
(D) Stefan’s Law
Option a – Wien’s displacement Law
The maximum wavelength of radiation emitted at 2000 K is 4 um. What will be the maximum wavelength of radiation emitted at 2400 K?
(A) 3.33 µm
(B) 0.66 μm
(C) 1 μm
(D) 1 m
Option a – 3.33 µm
The temperatures of the two bodies A and B are respectively 727°C and 327°C. The ratio HA : HB of the rates of heat radiated by them is ( 12th Physics One Mark Online Test )
(A) 727 : 327
(B) 5 : 3
(C) 25 : 9
(D) 625 : 81
Option d – 625 : 81
If the temperature of the black body is raised by 5% then the heat energy radiated would increase by :
(A) 5%
(B) 21.55%
(C) 41.65%
(D) 625%
Option b – 21.55%
The SI unit of Wien’s constant is ( 12th Physics One Mark Online Test )
(A) m/K
(B) cm/K
(C) mK
(D) m²K
Option c – mK
The maximum radiations from the two bodies correspond to 560 nm and 420 nm respectively. The ratio of their temperature is :
(A) 4 : 3
(B) 3 : 4
(C) 2 : 1
(D) 3 : 2
Option b – 3 : 4
The phenomenon of electromagnetic induction implies the production of induced ( 12th Physics One Mark Online Test )
(a) Current in a coil when a magnetic field changes with time
(b) Voltage in a coil when a magnetic field changes
(c) Current in a coil when an electric field changes with time
(d) Resistance in a coil when the magnetic field changes with time
Option a – Current in a coil when a magnetic field changes with time
Which one of the following statements is correct? The space surrounding a charge in uniform motion has –
(a) Only a magnetic field
(b) Only an electric field
(c) Both electric and magnetic fields
(d) Neither an electric field nor a magnetic field
Option c – Both electric and magnetic fields
Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is ( 12th Physics One Mark Online Test )
(a) To cool the reactor
(b) To control the energy released in the reactor
(c) To absorb the neutrons and stop the chain reaction
(d) To slow down the neutrons to thermal energy
Option d – To slow down the neutrons to thermal energy
Which type of lens is used in movie projectors?
(a) Concave
(b) Convex
(c) Zoom
(d) Meniscus lens
Option b – Convex
In electric supply lines in India, which parameter is kept constant? ( 12th Physics One Mark Online Test )
(a) Voltage
(b) Power
(c) Current
(d) Frequency
Option d – Frequency
Why does one experience a strong shock when accidentally touching a live wire of 220 V?
(a) The resistance of the human body is very low
(b) The human body is sensitive to large currents only
(c) The resistance of the human body is very high
(d) The human body is sensitive to even feeble currents
Option d – The human body is sensitive to even feeble currents
The dimensional formula for the universal gravitational constant is ( 12th Physics One Mark Online Test )
(a) M⁻¹L³T⁻²
(b) ML²T⁻²
(c) M⁻¹L³T²
(d) M⁻²
Option a – M⁻¹L³T⁻²
Which type of molecular motion does not contribute towards internal energy?
(a) Rotational
(b) Translational
(c) Vibrational
(d) None of these
Option b – Translational
What is the principle by which a cooling system in a motor car works? ( 12th Physics One Mark Online Test )
(a) Convection
(b) Conduction only
(c) Radiation only
(d) Both conduction and radiation
Option a – Convection
Which of the following is the best conductor of heat?
(a) Benzene
(b) Silver
(c) Mercury
(d) Leather
Option b – Silver
How can the boiling point of a liquid be reduced? ( 12th Physics One Mark Online Test )
(a) By dissolving a soluble solid in it
(b) By increasing the pressure on the liquid
(c) By decreasing the pressure on the liquid
(d) By adding a solid of lower melting point
Option c – By decreasing the pressure on the liquid
The technique used to transmit audio signals in television broadcasts is –
(a) Amplitude modulation
(b) Pulse code modulation
(c) Frequency modulation
(d) Time division multiplexing
Option c – Frequency modulation
Which one of the following is printed on a commonly used fluorescent tube light? ( 12th Physics One Mark Online Test )
(a) 220 K
(b) 273 K
(c) 6500 K
(d) 9000 K
Option c – 6500 K
A ray of white light strikes the surface of an object. If all the colors are reflected, the surface would appear –
(a) Black
(b) Grey
(c) White
(d) Opaque
Option c – White
The Young’s Modulus for a perfectly rigid body is ( 12th Physics One Mark Online Test )
(a) Zero
(b) 1
(c) Infinite
(d) None of these
Option c – Infinite
Which of the following works on the basis of conservation of linear momentum?
(a) Aeroplane
(b) Rocket
(c) Jet
(d) Helicopter
Option b – Rocket
Definition of force comes from Newton’s ( 12th Physics One Mark Online Test )
(a) Law of gravitation
(b) First law of motion
(c) Second law of motion
(d) Third law of motion
Option b – First law of motion
Acting on a non-rigid body, a force can –
(a) Start motion
(b) Stop motion
(c) Produce dimensional change
(d) Produce a change in direction of motion
Option c – Produce dimensional change
A spherical steel ball dropped in a bucket full of mercury (Hg) will –
(a) Dissolve
(b) Sink to the bottom
(c) Float on the surface
(d) None of these
Option c – Float on the surface
The working principle of a washing machine is –
(a) Dialysis
(b) Diffusion
(c) Centrifugation
(d) Reverse osmosis
Option c – Centrifugation
Parasec is the unit of –
(a) Time
(b) Distance
(c) Magnetic line
(d) Intensity of light
Option b – Distance
The value of ‘g’ on Earth’s surface changes due to –
(a) Rotation of Earth only
(b) Shape of Earth only
(c) Both rotation and shape of the Earth
(d) None of these
Option c – Both rotation and shape of the Earth
Alternating current is used in long-distance electric transmission instead of direct current because –
(a) It is easy to generate
(b) It causes fewer accidents
(c) Rectification is possible
(d) Energy losses are minimum
Option d – Energy losses are minimum
The electrolyte in the dry cell is –
(a) Acid of sulphur
(b) Manganese dioxide
(c) Zinc
(d) Ammonium chloride
Option d – Ammonium chloride
Which one of the following non-metals is not a poor conductor of electricity?
(a) Bromine
(b) Selenium
(c) Sulphur
(d) Phosphorus
Option b – Selenium
Domestic electrical wiring is basically a –
(a) Series connection
(b) Parallel connection
(c) Combination of series and parallel connection
(d) Series connection within each room and parallel connection elsewhere
Option b – Parallel connection
Fluorescent tubes are fitted with a choke. The choke coil –
(a) Steps down the line voltage
(b) Reduces current in the circuit
(c) Steps up the line voltage
(d) Chokes low-frequency current
Option b – Reduces current in the circuit
Which color of heat radiation represents the highest temperature?
(a) White
(b) Dark cherry
(c) Blood red
(d) Salmon
Option b – Dark cherry
Clouds float in the atmosphere because of their low –
(a) Velocity
(b) Pressure
(c) Density
(d) Temperature
Option d – Temperature
The change of a solid into vapor directly is called –
(a) Melting
(b) Sublimation
(c) Density
(d) Vaporization
Option c – Density
A liquid initially contracts when cooled down to 4°C but on further cooling down to 0°C, it expands. The liquid is –
(a) Water
(b) Mercury
(c) Alcohol
(d) Molten iron
Option a – Water
Creation of something from nothing is against the law of –
(a) Constant proportions
(b) Multiple proportions
(c) Conservation of momentum
(d) Conservation of mass-energy
An object covers distance which is directly proportional to the square of the time. Its acceleration is –
(a) Constant
(b) Increasing
(c) Decreasing
(d) Zero
Option a – Constant
The unit of Planck’s constant is –
(a) Js
(b) J/s
(c) Js²
(d) Js²
Option a – Js
Metal teapots have wooden handles because –
(a) It gives beauty to the pots
(b) It prevents electric shock
(c) Wood is a bad conductor of heat
(d) It is hygienic
Option b – It prevents electric shock
Water will not be vaporized if –
(a) The humidity is 0%
(b) The humidity is 100%
(c) The temperature is 0°C
(d) The temperature is 100°C
Option b – The humidity is 100%
In AC circuits, AC meters measure –
(a) RMS value
(b) Mean value
(c) Peak value
(d) Mean square values
Option a – RMS value
A light beam which is highly directional is called –
(a) Eraser
(b) Laser
(c) Maser
(d) Grazer
Option b – Laser
The part of the eye having the largest refractive index is –
(a) Lens
(b) Cornea
(c) Aqueous Humor
(d) Vitreous Humor
Option a – Lens
The redness in the atmosphere at sunrise and sunset is due to –
(a) Dispersion of light
(b) Reflection of light
(c) Refraction of light
(d) Scattering of light
Option d – Scattering of light
A cycle tire bursts suddenly. This represents an –
(a) Isothermal process
(b) Isobaric process
(c) Adiabatic process
(d) Isochoric process
Option c – Adiabatic process
Which of the following phenomena helps to conclude that light is a transverse wave?
(a) Refraction
(b) Interference
(c) Polarization
(d) Diffraction
Option c – Polarization
The average kinetic energy of the molecules of an ideal gas is directly proportional to –
(a) Mass of molecules
(b) Velocity of molecules
(c) Temperature of environment
(d) Absolute temperature of the gas
Option d – Absolute temperature of the gas
The apparent weight of a man in a lift is less than the real weight when –
(a) The lift is going up with an acceleration
(b) The lift is going down with an acceleration
(c) The lift is going up with uniform speed
(d) The lift is going down with uniform speed
Option b – The lift is going down with an acceleration
The dimensional formula ML⁻¹T² corresponds to –
(a) Viscosity
(b) Thrust
(c) Modulus of elasticity
(d) Moment of a force
Option c – Modulus of elasticity
Which of the following liquids has the least density?
(a) Mercury
(b) Petrol
(c) Salt water
(d) Fresh water
Option b – Petrol
The fuse in our domestic electric circuit melts when there is a high rise in –
(a) Capacitance
(b) Current
(c) Resistance
(d) Inductance
Option b – Current
The process involved in making soap is –
(a) Condensation
(b) Polymerization
(c) Saponification
(d) Hydrolysis
Option c – Saponification
Sound cannot pass through –
(a) Air
(b) Steel
(c) Water
(d) Vacuum
Option d – Vacuum
Which of the following instruments is used to measure humidity?
(a) Anemometer
(b) Kata thermometer
(c) Clinical Thermometer
(d) Sling Psychrometer
Option d – Sling Psychrometer
Electrostatic precipitator is used to control the pollution of –
(a) Air
(b) Water
(c) Noise
(d) Thermal
Option a – Air
In electronics, what comes under a tank circuit?
(a) Capacity and inductance
(b) Resistance and capacity
(c) Resistance and inductance
(d) Resistance, capacity, and inductance
Option a – Capacity and inductance
Cool tube is used to produce –
(a) X-rays
(b) Gamma rays
(c) Radio waves
(d) Microwaves
Option a – X-rays
Woolen clothes keep the body warm because –
(a) Wool is a bad conductor
(b) Wool increases the temperature of the body
(c) Wool absorbs radiant heat from outer objects
(d) Wool rejects heat from outer objects
Option a – Wool is a bad conductor
The final image in a simple microscope is –
(a) Virtual, magnified, and erect
(b) Virtual, diminished, and erect
(c) Real, magnified, and erect
(d) Real, diminished, and inverted
Option a – Virtual, magnified, and erect
A pilot has to release the bomb to hit a target –
(a) Beyond the target
(b) Before the target
(c) Right above the target
(d) None of these
Option b – Before the target
Night photography and photography in mist and fog are possible using –
(a) Gamma radiation
(b) Microwave radiation
(c) Infra-red radiation
(d) Ultra-violet radiation
Option c – Infra-red radiation
The atmospheric air is held to the earth by –
(a) Winds
(b) Clouds
(c) Gravity
(d) Rotation of the earth
Option c – Gravity
Global warming is expected to result in –
(a) Change in crop pattern
(b) Increase in the level of sea
(c) Change in the coastline
(d) All of these
Option d – All of these
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