# Physics MCQ (Multiple Choice Questions) - SchoolingAxis

Que- Super cooling stands for cooling of a liquid :

a. At freezing point

b. Below freezing point

c. At melting point

d. Above melting point

Answer- Below freezing point

Que- The spring constant of a spring depends on its

a. Length only

b. Material only

c. Length and its diameter

d. Thickness, its diameter and its material

Answer- Thickness, its diameter and its material

Que- The average kinetic energy of the molecules of an ideal gas is directly proportional to

a. Velocity of Molecules

b. Mass of Molecules

c. Absolute temperature of the gas

d. Temperature of environment

Answer- Absolute temperature of the gas

Que- Steel is more elastic than rubber because it :

a. Requires larger deforming force

b. Is never deformed

c. Is deformed very easily

d. Is harder than rubber

Answer- Is deformed very easily

Que- Water will not be vapourised if

a. The temperature is 0°C

b. The humidity is 0%

c. The humidity is 100%

d. The temperature is 100°C

Answer- The humidity is 100%

Que- Relative humidity is expressed as

a. Grams

b. Kilograms

c. Percentage

d. Ratio

Que- According to special theory of relativity the mass of a particle

a. Increases with increase in velocity with respect to an observer.

b. Decreases with increase in velocity.

c. Decreases with decrease in velocity.

d. Is independent of its velocity.

Answer- Increases with increase in velocity with respect to an observer.

Que- Bolometer is used to measure

a. Frequency

b. Temperature

c. Velocity

d. Wavelength

Que- Boyle's law relates to

a. Kinetic Theory of Gases

b. Viscosity of Liquids

c. Elasticity of Solids

d. Plasticity of Solids

Answer- Kinetic Theory of Gases

Que- Absolute Zero is defined as

a. The temperature at which all molecular motion ceases

b. At which water boils at 298K

c. At which liquid Helium boils

d. At which the volume becomes zero

Answer- The temperature at which all molecular motion ceases

Que- At what temperature (in degree Celsius), the numerical values on Celsius and Fahrenheit scales become equal?

a. –40

b. 40

c. 273

d. –273

Que- At what temperature (in Fahrenheit) pure water freezes?

a. 32

b. 0

c. 48

d. 37

Que- On the Kelvin scale, the melting point of ice is

a. 373K

b. 100K

c. 273K

d. 0 K

Que- The temperature which has the same reading on both Fahrenheit and Celsius scales is

a. 40°

b. –40°

c. 0°

d. 32°

Que- 'Farad' is the unit of :

a. Capacitance

b. Inductance

c. Resistance

d. Conductance

Que- Which of the following have the same unit ?

a. Work and power

b. Torque and moment of inertia

c. Work and torque

d. Torque and angular momentum

Answer- Work and torque

Que- Kilohertz is a unit which measures

a. Electromagnetic radio wave frequencies

b. Electric resistance

c. Power used by a current of one ampere

d. Voltage

Que- What is the unit of the physical quantity "Inductance"?

a. Weber

c. Henry

d. Tesla

Que- Pycnometer is an instrument used to measure the

a. Density

b. Intensity of solar radiation

c. Intensity of earthquake

d. High temperatures

Que- Ohm's law is valid in case of

a. Semiconductor

b. Conductor

c. Superconductor

d. Insulator

Que- Electrical burns occur principally because of

a. Radiation pulses of the electricity

b. The heat generated by the flow of electrical current through the body

c. The high energy of electrons

d. All of the above

Answer- The heat generated by the flow of electrical current through the body

Que- The SI unit of resistance is:

a. Newton

b. Coulomb

c. Ohm

d. Joule

Que- Electrical Energy is the energy of

a. Protons

b. Neutrons

c. Electrons

d. All the above

Que- As water is cooled from 4 deg C to 0 deg C, its density

a. Increases

b. Decreases

c. Remains same

d. None of the above

Que- Sound waves in air are

a. transverse

b. longitudinal

c. electromagnetic

d. polarised

Que- Magnetism at the centre of a bar magnet is

a. minimum

b. maximum

c. zero

d. minimum or maximum

Que- It is more difficult to walk on a sandy road than on a concrete road because

a. sand is soft and concreter is hard.

b. the friction between sand and feet is less than that between concrete and feet.

c. the friction between sand and feet is more than that between concrete and feet.

d. the sand is grainy but concrete is smooth.

Answer- the friction between sand and feet is less than that between concrete and feet.

Que- Of the following properties of a wave, the one that is independent of the other is its

a. amplitude

b. velocity

c. wavelength

d. frequency

Que- A car parked in the sun with its windows closed gets terribly hot inside. This is due to

a. The heat emitted by the engine

b. The greenhouse effect

c. The good conducting power of the metal body

d. The double layered wind shield

Answer- The greenhouse effect

Que- To measure the speed of an approaching car a police officer shines

a. Light waves on it

b. Microwaves on it

c. Radio waves on it

d. Ultra high frequency waves on it

Que- The device used for measuring the wavelength of X-rays is

a. G.M. Counter

b. Cyclotron

c. Bragg Spectrometer

d. Mass Spectrometer

Que- If the wavelengths corresponding to ultraviolet, visible and infrared radiations are given as lUV, lVIS and lIR respectively, then which of the following gives the correct relationship among these wavelengths?

a. LUV < lIR < lVIS

b. LUV > lVIS > lIR

c. LUV > lIR > lVIS

d. LUV < lVIS < lIR

Answer- LUV < lVIS < lIR

Que- Transition ions absorb light in :

a. Infrared region

b. Ultraviolet region

c. Microwave region

d. Visible region

Que- Pure water is bad conductor of electricity because it is

a. Feebly ionized

b. Not volatile

c. A very good solvent

d. A non-polar solvent

Que- The metal whose electrical conductivity is more, is

a. Copper

b. Aluminium

c. Silver

Que- Which of the following is a conductor of electricity ?

a. Rubber

b. Pure water

c. Salt water

d. Benzene

Que- A bird sitting on a high tension electric wire does not get electrocuted because

a. It has high resistance

b. The body is earthed

c. It does not form a closed path for the flow of current

d. Its feet are good insulators

Answer- It does not form a closed path for the flow of current

Que- The fuse in our domestic electric circuit melts when there is a high rise in

a. Inductance

b. Current

c. Resistance

d. Capacitance

Que- Which compressor is usually used in AC?

a. Centrifugal

b. Rotary

c. Reciprocating

d. Axial

Que- The best material for the core of a transformer is

a. Stainless steel

b. Mild steel

c. Hard steel

d. Soft iron

Que- A transformer works on the principle of

a. Self induction

b. Mutual induction

c. Generator

d. Inverter

Que- Transformer is a device to convert

a. D.C. to A.C.

b. Low voltage D.C. into high voltage D.C.

c. Low voltage A.C. into high voltage A.C.

d. Mechanical energy into Electrical energy

Answer- Low voltage A.C. into high voltage A.C.

Que- Atomic hydrogen has a life period of

a. One hour

b. One day

c. One minute

d. A fraction of a second

Answer- A fraction of a second

Que- If cream is removed from milk, its density

a. Increases

b. Decreases

c. Remains the same

d. May increase or decrease

Que- A falling drop of rain water acquires the spherical shape due to

a. Viscosity

b. Surface Tension

c. Atmospheric pressure

d. Gravitational force

Que- Why the needle of iron swims on water surface when it is kept gently ?

a. It will remain under the water, when it will displace more water than its weight

b. The density of needle is less than that of water

c. Due to surface tension

d. Due to its shape

Answer- Due to surface tension

Que- Rise of oil a wick is due to

a. Density of the oil

b. Viscosity of the oil

c. Surface tension of the oil

d. Pressure of the oil

Answer- Surface tension of the oil

Que- Bubbles of air rise up through liquids due to

a. Surface tension and adherence

b. Viscosity and buoyancy

c. Air current over the liquid and buoyancy

d. Up thrust and surface tension

Answer- Viscosity and buoyancy

Que- What is refractive index ?

a. It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.

b. It is defined as the product of speed of light in medium and in vacuum.

c. It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.

d. None of above

Answer- It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.

Que- A star appears twinkling in the sky because of

a. Scattering of light by atmosphere

b. Reflection of light by atmosphere

c. Refraction of light by atmosphere

d. Diffraction of light by atmosphere

Answer- Refraction of light by atmosphere

Que- What type of lens is used in a magnifying glass

a. Concave

b. Plano-concave

c. Convex

d. None of the above

Que- Time of exposure required for taking photograph of an object depends upon the

a. Brightness of the object

b. Skill of photographer

c. Proximity of object

d. Size of the object

Answer- Brightness of the object

Que- A concave lens always forms

a. A real image

b. A virtual image

c. An image type which depends on object characteristics

d. An image type which depends on lens curvature

Answer- A virtual image

Que- The density of water is 1 g/c. This is strictly valid at

a. 0°C

b. 4°C

c. 25°C

d. 100°C

Que- Specific gravity is defined as the ratio of

a. Density of the substance to the density of water

b. Density of the substance to the density of water at 0°C

c. Density of water at 4°C to the density of the substance

d. Density of the substance to the density of water at 4°C

Answer- Density of the substance to the density of water

Que- The cause for the Tsunami, as deduced by the seismologists, is

a. Gravitational pull of the moon

b. Low pressure trough in the ocean

c. Deformation of sea floor and vertical displacement of water

d. Sudden change in the monsoon wind

Answer- Deformation of sea floor and vertical displacement of water

Que- Which statement best describes an igneous intrusion?

a. Igneous intrusion for when ice crystals splash into lava

b. Magma is injected into surrounding rock forming an igneous intrusive

c. Magma is exported to an open area and forms iron

d. Magma explodes to the surface and forms a smooth outer layer of rock

Answer- Magma is injected into surrounding rock forming an igneous intrusive

Que- Which is a common first indicator of an approaching thunderstorm?

a. Too hot

b. Heavy wind

c. A buildup of dark clouds

d. Lightning

Answer- A buildup of dark clouds

Que- Necessary element of change in solar energy to electrical energy

a. Berillium

b. Silicon

c. Tantelum

d. Pure Copper

Que- In hydro power station, the motion produced in turbines is due to

a. Flow of water

b. Burning of coal

c. Burning of diesel

d. Production of steam

Answer- Flow of water

Que- The SI unit for measuring work and energy is

a. Joule

b. Watt

d. Ohm

Que- In a rechargeable cell what kind of energy is stored within the cell?

a. Electrical energy

b. Potential energy

c. Chemical energy

d. Kinetic energy

Que- A bullet is fired from a rifle which recoils after firing. The ratio of kinetic energy of the rifle to that of the bullet is

a. Zero

b. One

c. Less than one

d. More than one

Que- The ''four stroke petrol engine' is based on

a. Carnot-cycle

b. Otto-cycle

c. Diesel-cycle

d. Boyle's-cycle

Que- The spring balance works on the principle of ________ .

a. Boyle's Law

b. Hooke's Law

c. Bernoulli's principle

d. Pascal's Law

Que- A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole ?

a. Increase

b. Dacrease

c. Remain constant

d. Will increase first and then dcrease

Que- Air is said to be saturated when

a. Its pressure is minimum

b. It contains the maximum content of water vapour

c. Its thickness is maximum

d. It blows over the barren land

Answer- It contains the maximum content of water vapour

Que- At constant pressure, the volume of a fixed mass of a gas is directly proportional to its absolute temperature. It is the statement of

a. Boyle's Law

b. Charle's Law

c. Gay-Lussac's Law

Que- During hot weather, the fan produces a feeling of comfort. This is because

a. Fan supplies cool air

b. Fan cools the air

c. Our perspiration eva-porates rapidly

d. Conductivity of air increases

Answer- Our perspiration eva-porates rapidly

Que- The flow of thermal energy is called

a. Heat

b. Current

c. Voltage

d. Potential

Que- On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

a. Metals have higher thermal capacity than plastics

b. Plastics have a lower density than metals

c. Metals are good conductors of heat

d. Plastics have a higher thermal conductivity than metals

Answer- Metals are good conductors of heat

Que- Which of the following is an insulator?

a. Mercury

b. Carbon

c. Germanium

d. Glass

Que- 'Therm' is the unit of

a. Power

b. Heat

c. Light

d. Distance

Que- What is the minimum escape velocity of rocket to be launched into space ?

a. 5 Km/Sec.

b. 6 Km/Sec.

c. 11 Km/Sec.

d. 15 Km/Sec.

Que- The period of revolution of a geostationary satellite is

a. 365 days

b. 30 days

c. 24 hours

d. Changing continuously

Que- The laws which govern the motion of planets are called ________

a. Newton's Laws

b. Kepler's Laws

d. De Morgan's Laws

Que- Who gave the Theory of Relativity?

a. Isaac Newton

b. Archimedes

c. Albert Einstein

d. Galileo Galilei

Que- Which of the following was the first theory of superconductivity?

a. Ginzburg Landau theory

b. London theory

c. Resonating valence bond theory

d. Quantum field theory

Que- A wire of copper having length I and area of cross-section A is taken and a current i is flown through it. The power dissipated in the wire is P. If we take an aluminium wire having same dimensions and pass the same current through it, the power dissipated will be

a. P

b. < P

c. > P

d. 2P

Que- A wire carrying current is

a. Positively charged

b. Negatively charged

c. Neutral

d. Charged with a type depending upon current strength

Que- Carbon Arc lamps are commonly used in

a. Cinema projectors

b. Photography

c. Vehicles

d. Domestic lighting

Que- A gas thermometer is more sensitive than a liquid thermometer because a gas :

a. Is lighter than liquid

b. Expands more than a liquid

c. Is easy to obtain

d. Does not change state easily

Answer- Expands more than a liquid

Que- What is the SI unit of temperature?

a. Kelvin

b. Joule

c. Celsius

d. Fahrenheit

Que- Earliest thermometer was developed by

a. Celsius

b. Fahrenheit

c. Kelvin

d. Galileo

Que- The absolute zero is a temperature at which ________

a. Molecular motion in a gas would cease

b. Water freezes

c. All gases become liquid

d. All gases become solid

Answer- Molecular motion in a gas would cease

Que- Ice cubes are added to a glass of pure water and a glass of pure alcohol. The ice would be

a. At a higher level in water

b. At a higher level in alcohol

c. At the same level in both

d. Floating in alcohol and sinking in water

Answer- At a higher level in water

Que- Which of the following characteristics of light remains unchanged when light travels from vaccum enters water?

a. Speed

b. Amplitude

c. Frequency

d. Wavelength

Que- To resolve an object in an electron microscope,

a. The wavelength of the electrons must be close to the diameter of the object

b. The wavelength of the electrons must be greater than the diameter of the object.

c. Both A & B

d. None of the above

Answer- The wavelength of the electrons must be close to the diameter of the object

Que- Which of the following is an example of continous emission spectrum?

a. Spectrum of an oil frame

b. Spectrum of a water

c. Both

d. None

Answer- Spectrum of an oil frame

Que- The atmospheric layer reflecting radio waves is called

a. Ozonosphere

b. Ionosphere

c. Stratosphere

d. Mesosphere

Que- For a ray of light to suffer total internal reflection it has to pass from :

a. Glass to water

b. Water to glass

c. Air to water

d. Air to glass

Answer- Air to water

Que- Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to:

a. The heating effect of current alone

b. Hysteresis loss alone

c. Both the heating effect of current and hysteresis loss

d. Intense sunlight at noon

Answer- Both the heating effect of current and hysteresis loss

Que- Nuclear sizes are expressed in a unit named

a. Fermi

b. Angstrom

c. Newton

d. Tesla

Que- Light year is a unit of

a. Time

b. Distance

c. Light

d. Intensity of light

Que- Mirage is due to:

a. Unequal heating of different parts of the atmosphere

b. Magnetic disturbances in the atmosphere

c. Depletion of ozone layer in the atmosphere

d. Equal heating of different parts of the atmosphere

Answer- Unequal heating of different parts of the atmosphere

Que- Light from the Sun reaches us in nearly

a. 2 minutes

b. 4 minutes

c. 8 minutes

d. 16 minutes

Que- A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is

a. Greater than the weight of the man

b. Less than the weight of the man

c. Same as the weight of the man

d. Zero

Answer- Greater than the weight of the man

Que- Who defined the law of gravitation ?

a. Newton

b. Archimedes

c. Galileo

Que- It is difficult to fix a nail on a freely suspended wooden frame. Which law supports this statement?

a. Law of inertia

b. Newton's second law

c. Newton's third law

d. Pascal's law

Answer- Newton's third law

Que- In the Earth, the weight of a body is maximum at the

a. North Pole

b. South Pole

c. Equator

d. Surface