Free Practice Questions for Physics in General-studies
Practice questions here, for every subject and every exam. Unlimited questions for unlimited attempts, given with answers and explanations.
Question 41:
The term 'Askaryan effect' is associated with which functional area of science?
Correct Answer: 1
The Askarian effect in physics is named after Gurgan Askarian, a Soviet-Armenian physicist who hypothesized it in 1962.
Important Points:
- It is the phenomenon in which a particle traveling faster than the phase velocity of light in a dense dielectric produces a shower of secondary charged particles.
- in which the charge has anisotropy and thus emits a cone of coherent radiation in radio or radio.
- secondary charged particles in the microwave portion of the electromagnetic spectrum that have a charge anisotropy
- Thus emitting a cone of coherent radiation in the radio or microwave part of the electromagnetic spectrum.
- This is similar to the Cherenkov effect.
- This phenomenon is of primary interest in using bulk matter to detect ultra-high energy neutrinos.
Question 42:
During the occurrence of thunder and lightning:
Correct Answer: 4
The sound of a thunder is heard a little later than the flash of light is seen because speed of Sound is much less than the speed of light.
Important Points:
- The speed of sound decreases when we go from solid to gaseous state.
- The speed of sound is directly proportion to the temperature.
- For example, the speed of sound in air is 331 m s–1 at 0 ºC and 344 m s–1 at 22 ºC.
- When the speed of any object exceeds the speed of sound it is said to be travelling at supersonic speed, jet aircrafts ,Bullets often travel at supersonic speeds.
Question 43:
________ is the process by which water vapour in the air is changed into liquid water.
Correct Answer: 4
Evaporation is a process by which water is transformed from liquid to gaseous state. Heat is the main cause for evaporation. When moist air is cooled, it may reach a level when its capacity to hold water vapour ceases. Then, the excess water vapour condenses into liquid form(droplets of water). Condensation is caused by the loss of heat. When these droplets of water become too heavy to float in air, then they come down as precipitation. The precipitation in the form of water is called rainfall, when the temperature is lower than the 0$^\circ$C, precipitation takes place in the form of fine flakes of snow and is called snowfall. |
SSC CHSL 08/07/2019 (Afternoon)
IMPORTANT FACTS
- The hydrological cycle, is the circulation of water within the earth’s hydrosphere in different forms i.e. the liquid, solid and the gaseous phases.
- The solid form, snow and ice, is present as ice caps at the poles of the earth, snow-covered mountains and glaciers. Liquid water is present in oceans, lakes, rivers, and even underground. The gaseous form is the water vapour present in the air around us.
- 22 March is celebrated as the world water day.
- About 71% of the earth’s surface is covered with water. Almost all the water on the earth is contained in the seas and oceans, rivers, lakes, ice caps, as groundwater and in the atmosphere.
Question 44:
A high tensile alloy steel called_____was used to construct Howrah Bridge.
Correct Answer: 4
A high tensile alloy steel called TISCROM was used to construct Howrah Bridge.
Important Points:
- Howrah Bridge is a bridge situated over the Hooghly river in West Bengal.
- It does not have any nuts and bolts.
- The entire structure consuming 6,500 tons of steel and a high tensile alloy, Tiscrom, supplied by the Tata steel in 1942.
- It is also called the “Gateway of Kolkata”.
Question 45:
Which of the following metals is the most ductile metal?
Correct Answer: 2
From the following Gold is the most ductile metal.
Important Points:
- Atomic number of gold is 79, It is extremely unreactive and doesn’t tarnish like most other metals.
- It is found in the free state, The symbol for gold is represented by the first two letters of its Latin name Aurum, Au.
- Pure gold, known as 24 carat gold, is very soft. It is, therefore, not suitable for making jewellery, It is alloyed with either silver or copper to make it hard.
- Aqua regia, mixture of Nitric and Hydrochloric acid in the ratio of 1:3 is used for the dissolution of gold.
Question 46:
Which of the following is equivalent to coulomb per second?
Correct Answer: 4
Electric current (I) is the amount of charge(Q) flowing through a particular area in unit time (t).I = Q/t. The SI unit of electric current is ampere (A), named after the French scientist, Andre-Marie Ampere. One ampere is constituted by the flow of one coulomb of charge per second. The electric current in a circuit is measured by an instrument called an ammeter. An ammeter is always connected in series in a circuit through which the current is to be measured. Farad, Ohm, and volt are the SI unit of capacitance, resistance, and potential difference respectively. |
MTS 13/10/21(Morning)
IMPORTANT FACTS
Physical quantity | SI units |
Area | Square metre |
Acceleration | Metre per second square |
Magnetic flux | Weber |
Inductance | Henry |
Force | Newton |
Pressure , stress | Pascal |
Energy, work, heat | Joule |
Power, radiant flux | Watt |
Electric potential, potential difference, electromotive force | Volt |
Magnetic field, magnetic flux density, magnetic induction | Tesla |
Luminous flux, luminous power | lumen |
Angular momentum, planck’s constant | Joule second |
Molar entropy, molar heat capacity | Joule per mole Kelvin |
Question 47:
Which instrument is used to measure very high temperature?
Correct Answer: 4
An instrument called pyrometer is used to measure very high temperature.
Important Points:
- Fathometer is used to measure the depth of the sea.
- Manometer is used to measure pressure.
- Salinometer measures the salinity of a solution.
- Viscometer is used to measure the viscosity of liquids.
- Wattmeters are used to measure the power of an electrical circuit.
Instrument Name | Uses |
Altimeter | An instrument used in aircrafts for measuring altitudes. |
Ammeter | An instrument used to measures strength of electric current. |
Barometer | An instrument used to measures atmospheric pressure. |
Electroscope | An instrument used to detects presence of an electric charge. |
Galvanometer | An instrument used to measure electric current. |
Hydrometer | An instrument used to measure the relative density of liquids. |
Hygrometer | An instrument used to measure level of humidity. |
Ohmmeter | An instrument used to measure electrical resistance in ohms. |
Periscope | An instrument used to view objects above sea level(used in submarines) |
Seismograph | An instrument used to recording the intensity and origin of earthquakes shocks. |
Speedometer | An instrument used to measure speed of vehicle. |
Voltmeter | An instrument used to measure electric potential difference between two points. |
Question 48:
What is the unit to measure the wavelength of light?
Correct Answer: 4
Angstrom is the unit of the wavelength of light.
Important Points:
- The wavelength (λ) is the distance between two adjacent crests or troughs in a wave.
- Angstrom(Å) is named after Anders Jonas Angstrom and it is equal to 10-10 m.
- Angstrom is used to measure the very small size of atoms and molecules.
- SI unit of electrical capacitance is Farad and the unit of luminous intensity is Candela.
- Dyne is the CGS unit of force.
Question 49:
A ______ is an instrument used m for measuring electrical potential difference between two points in an electric circuit.
Correct Answer: 1
The electric potential difference between two points in an electric circuit carrying some current as the work done to move a unit charge from one point to the other. Potential difference (V) between two points = Work done (W)/Charge (Q). The SI unit of electric potential difference is volt (V), named after Alessandro Volta. The potential difference is measured by means of an instrument called the voltmeter. The voltmeter is always connected in parallel across the points between which the potential difference is to be measured. A galvanometer is used to measure the electric current of low magnitude in a circuit. An ammeter is used to measure the magnitude of electric current in a circuit. A bolometer is used to measure infrared radiations. |
SSC MTS 06/10/21 (Afternoon)
IMPORTANT FACTS
Instrument Name | Uses |
Altimeter | An instrument used in aircrafts for measuring altitudes. |
Fathometer | An instrument used to measure the depth of the ocean. |
Salinometer | An instrument used to measure salinity of the solution. |
Viscometer | An instrument used to measure the viscosity of the fluid. |
Barometer | An instrument used to measures atmospheric pressure. |
Electroscope | An instrument used to detects presence of an electric charge. |
Hydrometer | An instrument used to measure the relative density of liquids. |
Hygrometer | An instrument used to measure level of humidity. |
Ohmmeter | An instrument used to measure electrical resistance in ohms. |
Periscope | An instrument used to view objects above sea level(used in submarines) |
Seismograph | An instrument used to recording the intensity and origin of earthquakes shocks. |
Speedometer | An instrument used to measure speed of vehicle. |
Question 50:
Of the units mentioned in the options, which one is the largest as compared to the others?
Correct Answer: 3
Tera is a prefix used with the metric system that stands for 1012. Prefixes used in the SI System are hecto for 102, deca for 101, giga for 109. The SI system has seven base units. These are metre(unit of length), kilogram(unit of mass), second(unit of time), ampere(unit of electric current), Kelvin( unit of temperature), mole(unit of amount of substance), and candela(unit of luminous intensity). |
SSC MTS 05/10/21(Evening)
factor (power) | Prefix | Symbol |
10-12 | pico | p |
10-9 | nano | n |
10-6 | micro | µ |
10-3 | milli | m |
10-2 | centi | c |
10 | deca | da |
102 | hecto | h |
103 | kilo | k |
109 | giga | G |
1012 | tera | T |
1018 | exa | E |
1021 | zeta | Z |
1024 | yotta | Y |
Question 51:
Which among the following instruments is used to measure either direct or alternating electric current?
Correct Answer: 3
Electric current (I) is the amount of charge(Q) flowing through a particular area in unit time(t).I = Q/t. The SI unit of electric current is ampere (A), named after the French scientist, Andre-Marie Ampere. One ampere is constituted by the flow of one coulomb of charge per second. Electric current in a circuit is measured by an instrument called ammeter. Ammeter is always connected in series in a circuit through which the current is to be measured. Wattmeter is used to measure the power of electric circuit. Hygrometer is used to measure the amount of humidity or amount of water vapor in the air. Pyrometer is used to measure very high temperature. |
SSC MTS 05/10/21(Afternoon)
IMPORTANT FACTS
Instrument Name | Uses |
Altimeter | An instrument used in aircrafts for measuring altitudes. |
Fathometer | An instrument used to measure the depth of the ocean. |
Salinometer | An instrument used to measure salinity of the solution. |
Viscometer | An instrument used to measure the viscosity of the fluid. |
Barometer | An instrument used to measures atmospheric pressure. |
Electroscope | An instrument used to detects presence of an electric charge. |
Galvanometer | An instrument used to measure electric current. |
Hydrometer | An instrument used to measure the relative density of liquids. |
Ohmmeter | An instrument used to measure electrical resistance in ohms. |
Periscope | An instrument used to view objects above sea level(used in submarines) |
Seismograph | An instrument used to recording the intensity and origin of earthquakes shocks. |
Speedometer | An instrument used to measure speed of vehicle. |
Question 52:
In terms of SI prefixes 10-15 is called:
Correct Answer: 4
SI prefixes 10-15 is called Femto.
Important Points:
- Prefixes used in the SI System are yocto for 10-24, zepto for 10-21, atto for 10-18.
- The SI system has seven base units ,these are metre(unit of length), kilogram(unit of mass), second(unit of time), ampere(unit of electric current), Kelvin( unit of temperature), mole(unit of amount of substance), and candela(unit of luminous intensity).
Factor | Name | Symbol |
10-12 | pico | p |
10-9 | nano | n |
10-6 | micro | µ |
10-3 | milli | m |
10-2 | centi | c |
10 | deca | da |
102 | hecto | h |
103 | kilo | k |
109 | giga | G |
1012 | tera | T |
1018 | exa | E |
1021 | zeta | Z |
1024 | yotta | Y |
Question 53:
Coulomb per second is equivalent to ______.
Correct Answer: 2
Coulomb per second is equivalent to Ampere.
Important Points:
- Electric current (I) is the amount of charge(Q) flowing through a particular area in unit time(t).I = Q/t.
- Ampere (A), is the SI unit of electric current and is named after the French scientist, Andre-Marie Ampere.
- One ampere is constituted by the flow of one coulomb of charge per second.
- Ammeter is used to measure electric current in a circuit.
Question 54:
Parsec is a unit of ______.
Correct Answer: 3
For measuring large distances e.g., distances of planets and stars etc., some bigger units of length such as ‘astronomical unit’, ‘light year’, parsec’ etc. are used. Parsec is the distance at which average radius of earth’s orbit subtends an angle of 1 arc second. 1 parsec = 3.08 × 1016 m. Metre/second2(m/s2), second(s), metre(m), and metre/second(m/s) are the SI unit of acceleration, time, length, and velocity respectively. |
SSC CGL 18/08/21(Afternoon)
IMPORTANT FACTS
Units of length:
- 1 fermi = 1 f = 10–15 m
- 1 angstrom = 1 Å = 10–10 m
- 1 astronomical unit = 1 AU (average distance of the Sun from the Earth) = 1.496 × 1011 m
- 1 light year = 1 ly= 9.46 × 1015 m (distance that light travels with velocity of 3 × 108 m s–1 in 1 year)
Fundamental SI units-
- Length – metre(m)
- Current – Ampere(A)
- Amount of substance – Mole
- Mass – Kilogram(Kg)
- Time – Seconds(s)
- Luminous intensity – Candela(cd)
- Temperature – Kelvin(K)
Question 55:
Which of the following is the SI unit for measuring the amount of a substance?
Correct Answer: 2
The mole is the measuring unit of the amount of substance.
Important Points:
- One mole exactly contains6.02214076 × 1023 elementary units.
- An elementary entity may be an atom, an ion, a molecule, an electron, any other particle or specified group of particles.
- The Mass of one mole of atoms of an element is called its molar mass.
- For example- 18 g water has 1 mole molecules of water.
Question 56:
Weber per second is equivalent to ______.
Correct Answer: 1
The electric potential difference between two points in an electric circuit carrying some current as the work done to move a unit charge from one point to the other. Potential difference (V) between two points = Work done (W)/Charge (Q). The SI unit of electric potential difference is volt (V), named after Alessandro Volta. The potential difference is measured by means of an instrument called the voltmeter. The voltmeter is always connected in parallel across the points between which the potential difference is to be measured. Coulomb, Ohm, and Ampere are the SI unit of charge, resistance, and current respectively. |
SSC CGL 18/08/21(Afternoon)
IMPORTANT FACTS
Physical quantities | Name | Symbol |
Power, radiant flux | watt | W |
Electric potential, potential difference, electromotive force | volt | V |
Capacitance | farad | F |
Electric resistance | ohm |
|
Conductance | siemens | S |
Magnetic flux | weber | Wb |
Magnetic field, magnetic flux density, magnetic induction | tesla | T |
Inductance | henry | H |
Luminous flux, luminous power | lumen | lm |
Illuminance | lux | lx |
Question 57:
How many microns are there in a metre?
Correct Answer: 3
The unit ‘micron’, equals to 10–6 m(1µm =10–6 m).
Important points:
- A micron is a unit of length equal to one millionth of a meter.
- It is also known as a micrometer or a µm.
- The meter is the base unit of length in the International System of Units (SI).
- There are exactly 1000000 microns in a meter.
- This can be calculated by dividing the length of a meter in meters by the length of a micron in meters.
- The meter is equal to 1000 millimeters, and the micron is equal to 1000 nanometers.
- So, 1000 millimeters / 1000 nanometers = 1000000 microns / 1 micron = 1000000.
Question 58:
Which of the following has the same dimension as that of linear momentum?
Correct Answer: 1
A large force acting for a short time to produce a finite change in momentum is called an impulsive force. Impulse is the product of force and time which equals change in momentum. It is a vector quantity. Momentum of a body is defined to be the product of its mass m and velocity v, and is denoted by p. It is also a vector quantity. The rate of change of momentum of a body is directly proportional to the applied force and takes place in the direction in which the force acts. SI unit of both momentum and impulse is newton-second(N.s) or Kgm/s. |
SSC CGL 13/08/21(Morning)
IMPORTANT FACTS
Physical quantity | SI units |
Pressure , stress | Pascal |
Energy, work, heat | Joule |
Power, radiant flux | Watt |
Electric potential, potential difference, electromotive force | Volt |
Magnetic field, magnetic flux density, magnetic induction | Tesla |
Luminous flux, luminous power | lumen |
Angular momentum, planck’s constant | Joule second |
Molar entropy, molar heat capacity | Joule per mole Kelvin |
Question 59:
Electron-volt is a unit of ______.
Correct Answer: 2
Electron-volt is a unit of energy.
Important Points
- One electron volt(unit of energy) is the energy gained by an electron when it has been accelerated by a potential difference of 1 volt.
- 1 eV = 1.602 ×10 –19 J = 1.602 ×10 –12 erg.
- This unit is commonly used in atomic and nuclear physics. Joule and erg is the SI and CGS unit of energy respectively.
- Ampere, volt, and watt are the SI unit of electric current, potential difference, and power respectively.
Question 60:
In terms of SI prefixes 10-15 is called:
Correct Answer: 4
In terms of SI prefixes 10-15 is called Femto.
Important Points:
- The SI system has seven base units.
- These are metre(unit of length), kilogram(unit of mass), second(unit of time), ampere(unit of electric current), Kelvin( unit of temperature), mole(unit of amount of substance), and candela(unit of luminous intensity).
Multiple | Prefix | Symbol |
10-12 | pico | p |
10-9 | nano | n |
10-6 | micro | µ |
10-3 | milli | m |
10-2 | centi | c |
10 | deca | da |
102 | hecto | h |
103 | kilo | k |
109 | giga | G |
1012 | tera | T |
1018 | exa | E |
1021 | zeta | Z |
1024 | yotta | Y |
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