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Jeevith Publications Physics PDF Free Download Class 12 for Students
A pressure of 1 kg/cm² corresponds to
(A) 0.1 bar
(B) 1.0 bar
(C) 10.0 bar
(D) 100.0 bar
Option b – 1.0 bar
One standard barrel of crude oil is equivalent to
(A) 131 litres
(B) 159 litres
(C) 179 litres
(D) 201 litres
Option b – 159 litres
Which of the following represents the smallest length scale?
(A) Micron
(B) Nanometre
(C) Angstrom
(D) Fermimetre
Option d – Fermimetre
One nanometre can be expressed as
(A) 10⁻⁹ metre
(B) 10⁻⁸ metre
(C) 10⁻¹⁰ metre
(D) 10⁻⁶ metre
Option a – 10⁻⁹ metre
The unit “cusec” is used to measure
(A) Water purity
(B) Depth of water
(C) Rate of water flow
(D) Total quantity of water
Option c – Rate of water flow
The Dobson unit is associated with the measurement of
(A) Thickness of the Earth
(B) Thickness of diamond
(C) Thickness of the ozone layer
(D) Level of noise
Option c – Thickness of the ozone layer
SONAR Technology operates using
(A) Radio waves
(B) Audible sound waves
(C) Ultrasonic waves
(D) Infrasonic waves
Option c – Ultrasonic waves
Which instrument is used to determine sound intensity?
(A) Chronometer
(B) Anemometer
(C) Audiophone
(D) Audiometer
Option d – Audiometer
Submerged objects in seas and oceans are detected using
(A) Audiometer
(B) Galvanometer
(C) Sextant
(D) SONAR
Option d – SONAR
SONAR is most commonly employed by
(A) Astronauts
(B) Doctors
(C) Engineers
(D) Navigators
Option d – Navigators
An anemometer is used to measure
(A) Speed of water current
(B) Depth of water
(C) Speed or force of wind
(D) Light intensity
Option c – Speed or force of wind
Wind speed is measured with the help of a
(A) Barometer
(B) Anemometer
(C) Hydrometer
(D) Wind vane
Option b – Anemometer
Which of the following instrument–function pairs is incorrect?
(A) Anemometer – Wind speed
(B) Ammeter – Electric current
(C) Tacheometer – Pressure difference
(D) Pyrometer – High temperature
Option c – Tacheometer – Pressure difference
A pyrometer is an instrument designed to measure
(A) Atmospheric pressure
(B) Humidity
(C) Very high temperature
(D) Density
Option c – Very high temperature
Extremely high temperatures are measured using a
(A) Pyrometer
(B) Photometer
(C) Phonometer
(D) Pycnometer
Option a – Pyrometer
The operating principle behind a washing machine is based on
(A) Centrifugal action
(B) Dialysis
(C) Reverse osmosis
(D) Diffusion
Option a – Centrifugal action
Which one among the following is a scalar quantity?
(A) Displacement
(B) Velocity
(C) force
(D) Volume
Option d – Volume
A simple machine assists a person by enabling
(A) Less total work
(B) The same work with reduced effort
(C) The same work performed slowly
(D) The same work completed at a much faster rate
Option b – The same work with reduced effort
A person stands on a highly sensitive weighing balance. When he takes a deep breath, the balance reading
(A) Increases
(B) Decreases
(C) Remains unchanged
(D) May increase or decrease depending on air pressure
Option a – Increases
Which of the following quantities has both magnitude and direction?
(A) Time
(B) Speed
(C) Displacement
(D) Distance
Option c – Displacement
Identify the quantity that is a Vector in nature
(A) Momentum
(B) Pressure
(C) energy
(D) work
Option a – Momentum
The ratio of momentum to velocity of a body represents its
(A) Velocity
(B) Acceleration
(C) Mass
(D) force
Option c – Mass
force can be defined as the product of
(A) Mass and velocity
(B) Mass and acceleration
(C) Weight and velocity
(D) Weight and acceleration
Option b – Mass and acceleration
If the numerical values of the surface area and volume of a cube are the same, the length of its edge is
(A) 3
(B) 4
(C) 5
(D) 6
Option d – 6
The principle of conservation of energy states that
(A) energy can be both created and destroyed
(B) energy can be created
(C) energy cannot be created but can be destroyed
(D) energy can neither be created nor destroyed
Option d – energy can neither be created nor destroyed
Wind possesses which type of energy?
(A) Only potential energy
(B) Only kinetic energy
(C) Electrical energy
(D) Both kinetic and potential energy
Option b – Only kinetic energy
In wind energy generation, which form of energy is transformed into electrical energy?
(A) Kinetic energy
(B) Potential energy
(C) Solar energy
(D) Radiant energy
Option a – Kinetic energy
When a train begins to move forward, a seated passenger’s head tilts backward due to
(A) Inertia of rest
(B) Inertia of motion
(C) Moment of inertia
(D) Conservation of Mass
Option a – Inertia of rest
Walking on ice is more difficult than walking on a road because
(A) Ice is harder than the road
(B) The road surface is harder than ice
(C) Ice offers no reaction force
(D) Ice provides less friction than the road
Option d – Ice provides less friction than the road
A man jumps from a stationary boat with a speed of 5 m/s, causing the boat to move at 0.5 m/s. The Mass of the boat is how many times greater than the Mass of the man?
(A) 5.5 times
(B) 4.5 times
(C) 2.5 times
(D) 10 times
Option d – 10 times
A ball is dropped from the roof of a high-rise building and accelerates uniformly at 9.8 m/s². What speed will it attain after 3 seconds?
(A) 9.8 m/s
(B) 19.6 m/s
(C) 29.4 m/s
(D) 39.2 m/s
Option c – 29.4 m/s
If the radius of the Earth decreases by 1% while its Mass remains constant, how will the acceleration due to gravity at the surface change?
(A) It will increase by 0.59%
(B) It will increase by 2%
(C) It will decrease by 0.5%
(D) It will decrease by 29%
Option b – It will increase by 2%
During an extremely destructive Earthquake, the acceleration due to gravity on Earth would be
(A) More than 550 cm/s²
(B) More than 750 cm/s²
(C) More than 950 cm/s²
(D) More than 980 cm/s²
Option d – More than 980 cm/s²
A body weighs 100 kg on Earth where the acceleration due to gravity is 10 m/s². If gravity on the Moon is one-sixth of Earth’s gravity, what will be the Mass of the body on the Moon?
(A) 100/6 kg
(B) 60 kg
(C) 100 kg
(D) 600 kg
Option c – 100 kg
Weightlessness is best described as a condition of
(A) Complete absence of gravity
(B) Reduced gravitational pull
(C) Presence of vacuum
(D) None of these
Option a – Complete absence of gravity
Although the Earth revolves around the Sun at nearly 4,400 km per hour, we do not sense this motion because
(A) Humans are very small in size compared to Earth
(B) Our velocity relative to Earth is zero
(C) The Solar system itself is also moving
(D) Earth’s gravity keeps pulling us toward its center
Option b – Our velocity relative to Earth is zero
If Earth’s gravitational force suddenly ceased to exist, what would happen immediately?
(A) Objects would have zero weight but unchanged mass
(B) Objects would lose mass but retain weight
(C) Both mass and weight would become zero
(D) The mass of objects would increase
Option a – Objects would have zero weight but unchanged mass
An artificial satellite does not fall back to Earth because the planet’s gravitational force
(A) Does not act at orbital heights
(B) Is balanced by the Moon’s attraction
(C) Gives the satellite the required orbital speed
(D) Provides the necessary centripetal acceleration
Option d – Provides the necessary centripetal acceleration
A geosynchronous satellite remains in continuous motion in its orbit due to the centrifugal force arising from
(A) The thrust of the launching rocket
(B) Earth’s gravitational pull on the satellite
(C) Gravitational attraction of the Sun
(D) The satellite’s gravitational pull on Earth
Option b – Earth’s gravitational pull on the satellite
A satellite keeps revolving around the Earth primarily because of
(A) Centrifugal force
(B) Centripetal force
(C) Absence of gravitational force
(D) Other external forces
Option b – Centripetal force
Four fundamental forces exist in nature: gravitational, electromagnetic, weak nuclear, and strong nuclear forces. Which of the following statements is incorrect?
(A) Gravitational force is the strongest among them
(B) Electromagnetic force acts only on charged particles
(C) Weak nuclear force is responsible for radioactivity
(D) Strong nuclear force holds nucleons inside the nucleus
Option a – Gravitational force is the strongest among them
A person inside a lift experiences an increase in apparent weight when the lift is
(A) Moving upward with acceleration
(B) Moving downward with acceleration
(C) Moving upward at constant speed
(D) Moving downward at constant speed
Option a – Moving upward with acceleration
A cricket ball struck by a batsman rolls along a flat surface and eventually comes to rest because
(A) It was not hit with enough force
(B) Velocity is directly proportional to applied force
(C) A resisting force acts opposite to its motion
(D) No unbalanced force acts on the ball
Option c – A resisting force acts opposite to its motion
The time period of a simple pendulum depends mainly on its
(A) Mass
(B) Length
(C) Time
(D) Temperature
Option b – Length
Pendulum clocks usually lose time during summer because
(A) Summer days are longer
(B) Friction in the coils increases
(C) Thermal expansion increases the pendulum length
(D) The weight of the pendulum changes
Option c – Thermal expansion increases the pendulum length
When a girl swinging on a swing stands up from a sitting position, the time period of the swing will
(A) Decrease
(B) Increase
(C) Depend on her height
(D) Remain the same
Option a – Decrease
A pendulum clock runs faster during
(A) Summer
(B) Winter
(C) Spring
(D) Rainy season
Option b – Winter
The approximate escape velocity of the Earth is
(A) 15.0 km/s
(B) 21.1 km/s
(C) 7.0 km/s
(D) 11.2 km/s
Option d – 11.2 km/s
If an object is thrown upward with a speed of 8 km/s, what will happen? ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) It will escape completely into space
(B) It will fall back to Earth
(C) It will revolve around Earth in an orbit
(D) It will disintegrate
Option b – It will fall back to Earth
The Moon does not have an Atmosphere mainly because ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) It lies close to Earth
(B) It receives Solar radiation
(C) It revolves around Earth
(D) Its escape velocity is lower than the rms velocity of gas molecules
Option d – Its escape velocity is lower than the rms velocity of gas molecules
As temperature rises, the viscosity of most liquids generally ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Increases
(B) Decreases
(C) Stays the same
(D) May either increase or decrease depending on the liquid
Option b – Decreases
Kerosene moves upward through the wick of a stove due to the effect of ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Osmosis
(B) Diffusion
(C) Surface tension
(D) Biogenic contraction
Option c – Surface tension
A liquid climbs higher than water in a capillary tube because its ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Viscosity is greater than that of water
(B) Temperature is higher than that of water
(C) Surface tension is lower than that of water
(D) Surface tension is greater than that of water
Option d – Surface tension is greater than that of water
As an air bubble ascends from the bottom of a lake to the surface, it ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Becomes larger
(B) Becomes smaller
(C) Remains unchanged in size
(D) Spreads into a flat disc
Option a – Becomes larger
Ink leaks from a pen during air travel mainly because of ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Reduced atmospheric pressure
(B) Increased atmospheric pressure
(C) Expansion of ink due to Heat
(D) Excessive external force
Option a – Reduced atmospheric pressure
The working principle behind hydraulic brakes in vehicles is ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Archimedes’ principle
(B) Laws of motion
(C) Bernoulli’s principle
(D) Pascal’s law
Option d – Pascal’s law
A rapid fall in barometer reading is usually an indication of ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Stormy conditions
(B) Rainfall
(C) Cool and dry weather
(D) Hot and humid Climate
Option a – Stormy conditions
Which of the following materials is obtained as a residue or by-product during petroleum refining? ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Petrol
(B) Charcoal
(C) Coal
(D) Asphalt
Option d – Asphalt
In extremely cold winters, water at the bottom of lakes stays in liquid form because ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Ice poorly conducts Heat
(B) The lake surface loses no Heat
(C) Water attains maximum density at 4°C
(D) None of these
Option c – Water attains maximum density at 4°C
Aquatic life continues beneath frozen lakes in winter since ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Animals breathe through ice
(B) They store excess oxygen
(C) They can live without oxygen
(D) Water below ice remains at about 4°C
Option d – Water below ice remains at about 4°C
Fish survive in frozen lakes primarily because ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) They are warm-blooded
(B) They hibernate within ice
(C) Water near the lake bottom does not freeze
(D) Ice conducts Heat efficiently
Option c – Water near the lake bottom does not freeze
Increasing the amount of a substance does not affect its ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Volume
(B) Weight
(C) Mass
(D) Density
Option d – Density
When sugar dissolves in water to form an unsaturated solution, which property remains unchanged? ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Mass
(B) Density
(C) Concentration
(D) Volume
Option d – Volume
Water attains its highest density at a temperature of ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) 0°C
(B) 4°C
(C) 50°C
(D) 100°C
Option b – 4°C
The temperature at which water shows maximum density is ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) 4°C
(B) 0°C
(C) −4°C
(D) −8°C
Option a – 4°C
Maximum density of water corresponds to which absolute temperature? ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) 373 K
(B) 277 K
(C) 273 K
(D) 269 K
Option b – 277 K
An iron nail floats on mercury but sinks in water because ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Iron reacts less with mercury
(B) Iron is lighter than mercury but heavier than water
(C) Iron’s density lies between that of water and mercury
(D) Mercury is heavier than water
Option c – Iron’s density lies between that of water and mercury
A thin iron needle sinks in water, while a massive iron ship floats because ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) The needle has a sharp tip
(B) The ship has a broad structure
(C) The ship is driven by engines
(D) The needle displaces less water relative to its weight
Option d – The needle displaces less water relative to its weight
An iron needle can rest on the surface of water due to ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Buoyant force
(B) Surface tension
(C) Viscosity
(D) Gravity
Option b – Surface tension
When a bucket filled with water is lifted out of a well, it feels heavier because it ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Gains weight above the surface
(B) Becomes lighter above the surface
(C) Loses stability
(D) Gains mass
Option a – Gains weight above the surface
A weightless balloon containing 200 g of water will have an apparent weight in water of ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Zero
(B) 100 g
(C) 200 g
(D) 400 g
Option a – Zero
Cream separates from milk during churning due to the action of ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Gravity
(B) Cohesive force
(C) Centrifugal force
(D) None of these
Option c – Centrifugal force
Clouds remain floating in the Atmosphere mainly because of their low ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Temperature
(B) Speed
(C) Pressure
(D) Density
Option d – Density
Which of the following elements was first synthesized artificially? ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) Neptunium
(B) Plutonium
(C) Francium
(D) Technetium
Option d – Technetium
When an iceberg floats in seawater, approximately what fraction stays above the surface? ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) 1/9
(B) 1/10
(C) 1/6
(D) 1/4
Option a – 1/9
An ice cube floating in a glass of water melts. What happens to the water level? ( Jeevith Publications Physics PDF Free Download Class 12 )
(A) It rises
(B) It falls
(C) It remains unchanged
(D) It rises first and then falls
Option c – It remains unchanged
We provided the Jeevith Publications Physics PDF Free Download Class 12 above in this post for free so that you can practice well for the exam.
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