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 61:
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).
- 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.
- Ohm, Volt, andJoule are the SI unit of resistance, potential difference, and energy respectively.
Physical quantity | SI units |
Area | Square metre |
Acceleration | Metre per second square |
Capacitance | Farad |
Magnetic flux | Weber |
Inductance | Henry |
Force | Newton |
Question 62:
Parsec is a unit of ______.
Correct Answer: 3
Parsec is a unit of length.
Important Points:
- For measuring large distances ,distances of planets and stars , some bigger units of length such as ‘astronomical unit’, ‘light year’, parsec’ are used.
- The distance at which average radius of earth’s orbit subtends an angle of 1 arc second is called Parsec.
- 1 Parsec is equal to 3.1×1016m.
Question 63:
Which of the following is the SI unit for measuring the amount of a substance?
Correct Answer: 2
The mole is the amount of substance of a system that contains 6.022 × 1023 specified elementary entities. An elementary entity may be an atom, a molecule, an ion, an electron, any other particle or specified group of particles. Mass of 1 mole of a substance is called its molar mass in grams. For example - 18 g water has 1 mole water molecules, that is, 6.022 × 1023 molecules of water. 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 CGL 18/08/21(Afternoon)
IMPORTANT FACTS
Physical quantity | Unit |
Pressure , stress | Pascal |
Energy, work, heat | Joule |
Power, radiant flux | Watt |
Electric potential, potential difference, electromotive force | Volt |
Surface tension | newton per metre |
Power density, irradiance, heat flux density | watt per square metre |
Energy density | joule per cubic metre |
Electric field strength | volt per metre |
Electric charge density | coulomb per cubic metre |
Electric flux density | coulomb per square metre |
Permittivity | farad per metre |
Question 64:
Weber per second is equivalent to ______.
Correct Answer: 1
Weber per second is equivalent to Volt.
Important Points:
- The (SI) unit of Magnetic flux is Weber.
- The SI unit of electric potential difference is Volt.
- Voltmeter is used to measure the potential difference.
- The voltmeter is used to measure the potential differences across two point in a circuit.
- Ohm, Coulomb, and Ampere are the SI unit of resistance, charge, and current.
Question 65:
How many microns are there in a metre?
Correct Answer: 3
The unit ‘micron’, equals to 10–6 m(1µm =10–6 m). The micrometre is commonly employed to measure the thickness or diameter of microscopic objects, such as microorganisms and colloidal particles. Minute distances—for example, the wavelengths of infrared radiation are also given in micrometres. The unit ‘femto’, equal to a 10–15 m has been used as the convenient length unit in nuclear studies. Similarly, the unit ‘barn’, equal to 10–28 m2 , is a convenient measure of cross-sectional areas in sub-atomic particle collisions. |
SSC CGL 17/08/21(Evening)
IMPORTANT FACTS
factor (power) | Prefix | Symbol |
10-24 | yocto | y |
10-21 | zepto | z |
10-15 | femto | f |
10-12 | pico | p |
10-9 | nano | n |
10-3 | milli | m |
10-2 | centi | c |
10 | deca | da |
102 | hecto | h |
103 | kilo | k |
109 | giga | G |
1021 | zeta | Z |
1024 | yotta | Y |
Question 66:
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 67:
Electron-volt is a unit of ______.
Correct Answer: 2
Electron-volt is a unit of energy.
Important Points:
- This unit is commonly used in atomic and nuclear physics.
- The symbol for an electron volt is eV.
- 1 electron volt = 1.602 × 10-19 Joules.
Question 68:
Which of the following would you associate with ‘dioptre’?
Correct Answer: 2
Ophthalmology is the study of the physiology, anatomy and diseases of eyes.
Important Points:
- Diopter is the SI unit for power of a lens.
- 1 Diopter = 1 meter -1(1 D = m-1).
- Power of a lens is positive for a converging lens and negative for a diverging lens.
Option Explanation:
- Oncology is the study of cancer.
- The study of the nervous system is called Neurology.
- Urology is the branch of medicine that focuses on the diagnosis and treatment of disorders and diseases of the urinary tract.
Question 69:
$30^{\circ}$ Celcius $=$ Kelvin (approximately)
Correct Answer: 1
0°C on the celsius scale is equal to 273.15 K at the Kelvin temperature scale or absolute temperature scale. Therefore, 30°C on the celsius scale is equal to 303.15 K or 303K at the Kelvin temperature scale. Kelvin scale of temperature is also called Thermodynamic scale of temperature. Kelvin is the SI unit of temperature. Temperature is a measure of hotness of an object. It determines the direction of flow of heat when two bodies are placed in thermal contact. Three different scales are commonly used to measure temperature, degree Celsius(°C), degrees Fahrenheit(°F), and Kelvin(K). |
SSC CPO 25-11-2020 (Morning)
IMPORTANT FACTS
Temperature Conversion Formulas :
- Celsius to Fahrenheit:
- Celsius to Kelvin:
Physical quantity | SI unit | CGS unit |
Mass | Kilogram (Kg) | gram(g) |
Distance, depth, length | Metre(m) | centimeter(cm) |
Temperature | Kelvin(K) | degree celsius |
Area | m2 | cm2 |
Power | Watt or Joule/second(J/s) | erg/s |
Energy | Joule | erg |
Force | Newton | dyne or g.cm/s2 |
Acceleration | m/s2 | cm/s2 |
Density | Kg/m3 | g/cm3 |
Question 70:
One calorie of heat energy is equivalent to approximately ______ joules of mechanical Energy.
Correct Answer: 3
1 calorie is the amount of heat required to raise the temperature of 1 g of water by 1°C. 1 cal = 4.186 J. Joule is the SI unit of heat. The heat flows from a body at a higher temperature to a body at a lower temperature. There are three ways in which heat can flow from one object to another. These are conduction, convection and radiation. The materials which allow heat to pass through them easily are conductors of heat. For example aluminum, iron and copper. The materials which do not allow heat to pass through them easily are called insulators. For example- water, plastic, and air. Dark-coloured objects absorb more heat than the light-coloured objects. That is the reason we feel more comfortable in light-coloured clothes in the summer. |
SSC CPO 25-11-2020 (Morning)
IMPORTANT FACTS
Physical quantity | Unit |
Heat capacity, entropy | joule per kelvin |
Specific heat capacity, specific entropy | joule per kilogram Kelvin |
Specific energy, latent heat | joule per kilogram |
Radiant intensity | watt per steradian |
Thermal conductivity | watt per metre Kelvin |
Energy density | joule per cubic metre |
Electric field strength | volt per metre |
Electric charge density | coulomb per cubic metre |
Electric flux density | coulomb per square metre |
Permittivity | farad per metre |
Molar energy | joule per mole |
Angular momentum, Planck constant | Joule second |
Question 71:
‘Mho’ is the unit of ______ of a substance.
Correct Answer: 1
‘Mho’ is the unit of conductance of a substance.
Important Points:
- Electrical conductivity is that property of a conductor which permits the flow of charges through it.
- It is the inverse of resistance.
- The SI unit of conductance is siemens,
- Conductance is represented by the symbol ‘S’ and it is equal to ohm–1.
- Metallic or electronic conductance is Electrical conductance through metals and it is due to the movement of electrons.
- The conductance of electricity by ions present in the solutions is called electrolytic or ionic conductance.
Physical quantity | Unit |
Resistivity | Ohm-metre |
Resistance | Ohm |
Conductivity | (Ohm-metre)-1 |
Question 72:
1 horse power is equal to approximately ______ watts.
Correct Answer: 4
Power is defined as the time rate at which work is done or energy is transferred. Power is a scalar quantity. Its dimensions are [ML2T–3]. Its SI unit is watt, W. 1 Watt = 1 J/s . The unit of power is named after James Watt. Horse – power (hp) is another unit of power. This unit is still used to describe the output of automobiles, motorbikes, etc. Average power is obtained by dividing the total energy consumed by the total time taken. |
SSC CPO 24-11-2020 (Morning)
IMPORTANT FACTS
Physical quantity | SI unit | CGS unit |
Mass | Kilogram (Kg) | gram(g) |
Distance, depth, length | Metre(m) | centimeter(cm) |
Temperature | Kelvin(K) | degree Celsius |
Area | m2 | cm2 |
Power | Watt or Joule/second(J/s) | erg/s |
Energy | Joule | erg |
Force | Newton | dyne or g.cm/s2 |
Acceleration | m/s2 | cm/s2 |
Density | Kg/m3 | g/cm3 |
Question 73:
Which one among the following measures the same quantity as that is measured by the SI unit ‘pascal’?
Correct Answer: 4
The thrust acting upon a unit area is called pressure. Its dimensions are [ML–1T –2]. The SI unit of pressure is N m–2. It has been named as pascal (Pa) in honour of the French scientist Blaise Pascal. The CGS unit of pressure is dyn/cm2. Pressure is a scalar quantity. It is directly proportional to force and inversely proportional to the area. Newton, Joule, and Watt are the SI unit of force, energy, and power respectively. |
SSC CPO 23-11-2020 (Morning)
IMPORTANT FACTS
Physical quantities | SI units |
Pressure | Pascal |
Mass | Kilogram |
Capacitance | Farad |
Magnetic flux | Weber |
Inductance | Henry |
Electric conductance | Siemens |
Stress | Pascal |
Mass density | Kilogram per cubic metre |
Current density | Ampere/square metre |
Volume | Cubic metre |
Phase angle | radian |
Area | Metre2 |
Impedance | Ohm |
Specific latent heat | Joule per kilogram |
Luminous flux | Lumen |
Wavenumber | metre-1 |
Electrical resistance | Ohm |
Electrical potential | Volt |
Question 74:
The difference in temperature between two bodies is 30 degree centigrade. What is the difference in degree Fahrenheit?
Correct Answer: 2
The relation between the temperature difference on the Fahrenheit scale and temperature difference on the Celsius scale is -
Important points
- Temperature is the measure of the hotness of an object.
- The lowest possible temperature is -273 degrees Celsius. This temperature is known as absolute zero.
Temperature | Fahrenheit (°F ) | Celsius (°C ) | Kelvin(K) |
Normal Human Body Temperature | 98°F | 37°C | 310K |
Boil Water | 212°F | 100°C | 373 K |
Water Freezes | 32°F | 0°C | 273 K |
Question 75:
Which of the following is the basic SI unit of thermodynamic temperature ?
Correct Answer: 4
Temperature is a measure of hotness of a object. It determines the direction of flow of heat when two bodies are placed in thermal contact. Heat flows from the body at a higher temperature to the one at lower temperature. The flow stops when the temperatures equalise; the two bodies are then in thermal equilibrium. Temperature is measured by a device called thermometer. Mole is the SI unit of amount of substance, metre is the SI unit of length, and candela is the SI unit of luminous intensity. |
SSC CHSL 20-10-2020 (Morning)
IMPORTANT FACTS
Physical quantities | Name | Symbol |
Power, radiant flux | watt | W |
Quantity of electricity, electric charge | coulomb | C |
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 76:
Identify the unit of measurement of energy.
Correct Answer: 2
An object having a capability to do work is said to possess energy. 1 Joule is the energy required to do 1 joule of work. Energy exists in nature in several forms such as kinetic energy, potential energy, heat energy, chemical energy etc. The sum of the kinetic and potential energies of an object is called its mechanical energy. Ampere, volt, and watt are the SI unit of electric current, potential difference, and power respectively. |
SSC CHSL 19-10-2020 (Morning)
IMPORTANT FACTS
Physical quantity | SI unit | Symbol |
Frequency | Hertz | Hz |
Force | Newton | N |
Pressure, stress | Pascal | Pa |
Magnetic field strength | Ampere per metre | A/m |
Luminance | Candela per square metre | cd/m2 |
Temperature | Kelvin | K |
Length | Metre | m |
Luminous intensity | Candela | cd |
Magnetic flux | Weber | Wb |
Capacitance | Farad | F |
Work, heat | Joule | J |
Momentum | Kilogram metre per second | Kgm/s |
Mass | Kilogram | Kg |
Potential difference | Volt | V |
Question 77:
Since the clinical thermometer is designed to measure the temperature of the human body only, it displays the range of 35 degree Celsius to ________.
Correct Answer: 3
Temperature is measured by a device called thermometer. The thermometer that measures our body temperature is called a clinical thermometer. A clinical thermometer consists of a long, narrow, uniform glass tube. It has a bulb at one end. This bulb contains mercury. The temperature of human body normally does not go below 35oC or above 42oC. That is the reason that this thermometer has the range 35oC to 42oC. The normal temperature of human body is 37°C. |
SSC CHSL 14-10-2020 (Evening)
IMPORTANT FACTS
- Laboratory thermometer is used to measure the temperature of common objects.
- The range of a laboratory thermometer is generally from –10°C to 110°C.
- The heat flows from a body at a higher temperature to a body at a lower temperature. There are three ways in which heat can flow from one object to another. These are conduction, convection and radiation.
- The SI unit of temperature is Kelvin, and degree Celsius is the commonly used unit of temperature.
- Conversion formula –
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 78:
Which of the following is the SI unit of thermodynamic temperature ?
Correct Answer: 3
The Kelvin is the SI unit of thermodynamic temperature.
Important Points:
- Temperature is a measure of hotness and coldness of an object.
- It determines the direction of flow of heat when two bodies are placed in thermal contact.
- Celsius and Fahrenheit are the commonly used unit of temperature.
- Temperature is measured by a device called thermometer.
- Radian is the SI unit of phase angle.
Question 79:
' Torr ' is a unit of _____.
Correct Answer: 2
' Torr ' is a unit of pressure.
Important Points:
- A torr is a unit of pressure named after Evangelista Torricelli, an Italian physicist and engineer.
- The torr is defined as the pressure exerted by a column of mercury 1 millimeter high at 0 degrees Celsius and standard atmospheric pressure.
- One torr is equal to 133.322 pascals, which is the SI unit of pressure.
- Pressure is defined as the force per unit area exerted by a substance on the surface of another substance.
- In the case of the torr, the force is exerted by the weight of the mercury column in the barometer.
Question 80:
Which one of the following statements is INCORRECT ?
Correct Answer: 3
The thrust acting upon a unit area is called pressure. Its dimensions are [ML–1T –2]. The SI unit of pressure is N m–2. It has been named as pascal (Pa) in honour of the French scientist Blaise Pascal. The CGS unit of pressure is dyn/cm2. Pressure is a scalar quantity. It is directly proportional to force and inversely proportional to the area. 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 CGL 7-03-2020 (Afternoon)
IMPORTANT FACTS
Evaporation
- The phenomenon of change of a liquid into vapours at any temperature below its boiling point is called evaporation.
- Evaporation is a surface phenomenon. Particles from the surface gain enough energy to overcome the forces of attraction present in the liquid and change into the vapour state.
- The rate of evaporation depends upon the surface area exposed to the atmosphere, the temperature, the humidity and the wind speed.
Alloys
- Alloys are mixtures of two or more metals or a metal and a non-metal and cannot be separated into their components by physical methods.
- Example- Solder is an alloy of lead and tin, bronze is an alloy of copper and tin.
Properties of alloys:
- Alloys are stronger than the metal which they are made.
- They are more resistant to corrosion.
- They have lower melting point.
- They have lower electrical conductivity.
Matter
- Matter is anything which occupies space and has mass.
Characteristics of Particles of Matter
- The particles of matter are very small.
- Particles of matter have space between them.
- Particles of matter are continuously moving.
- Particles of matter attract each other.
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