I.O.F. Chargemen Mechanical Online Mega Test

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Questions: 100 | Attempts: 296

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Mechanical Engineering Quizzes & Trivia

Questions and Answers
  • 1. 

    Which one of the following materials is used as the bonding material for grinding wheels

    • A.

      Silicon carbide

    • B.

      Sodium silicate

    • C.

      Boron carbide

    • D.

      Aluminium oxide

    Correct Answer
    B. Sodium silicate
    Explanation
    Sodium silicate is used as the bonding material for grinding wheels. It is a versatile compound that can form a strong bond between the abrasive particles and the wheel structure. Sodium silicate has excellent adhesive properties and can withstand high temperatures and pressures during grinding operations. It also provides good chemical stability and resistance to water, making it an ideal choice for bonding materials in grinding wheels.

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  • 2. 

    In reaming process

    • A.

      The metal removal rate is high

    • B.

      High surface finish is obtained

    • C.

      High form of accuracy is obtained

    • D.

      High degree of tolerance achieved

    Correct Answer
    D. High degree of tolerance achieved
    Explanation
    The given correct answer states that in the reaming process, a high degree of tolerance is achieved. Reaming is a machining operation that is used to enlarge a previously drilled hole to a more precise diameter. It is commonly used to improve the accuracy and finish of a hole. By using a reamer, the size and shape of the hole can be controlled more precisely, allowing for a higher degree of tolerance. This means that the final hole will be closer to the desired dimensions, resulting in a more accurate and precise finished product.

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  • 3. 

    In the griding wheel have specification A60G7B23, B stands for the

    • A.

      Resinoid bond

    • B.

      Rubber bond

    • C.

      Shellac bond

    • D.

      Silicate bond

    Correct Answer
    A. Resinoid bond
    Explanation
    The correct answer is resinoid bond. In the given specification A60G7B23, the letter "B" represents the resinoid bond. Resinoid bond refers to a type of bond used in grinding wheels where a resin-based material is used to hold the abrasive grains together. This bond type offers good performance and durability, making it suitable for various grinding applications.

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  • 4. 

    Wheel loading in grinding is defined as

    • A.

      Types of wheel bond fracture

    • B.

      Types of wheel grain fracture

    • C.

      Sticking of small particle on grinding wheel

    • D.

      None of the above

    Correct Answer
    C. Sticking of small particle on grinding wheel
    Explanation
    Wheel loading in grinding is defined as the phenomenon where small particles from the workpiece adhere to the surface of the grinding wheel during the grinding process. This can lead to a decrease in the cutting efficiency of the wheel, causing it to become less effective in removing material from the workpiece. Wheel loading can result in poor surface finish, increased heat generation, and reduced wheel life. Therefore, it is important to regularly clean and dress the grinding wheel to prevent wheel loading and maintain optimal grinding performance.

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  • 5. 

    Helix angle of a fast helix drill is normally

    • A.

      35

    • B.

      60

    • C.

      90

    • D.

      5

    Correct Answer
    A. 35
    Explanation
    The helix angle of a fast helix drill is normally 35 degrees. The helix angle refers to the angle formed between the cutting edge of the drill bit and a plane perpendicular to the axis of the drill. A smaller helix angle allows for more aggressive cutting action, making it suitable for drilling softer materials. A helix angle of 35 degrees strikes a balance between cutting efficiency and chip evacuation, making it a common choice for fast helix drills.

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  • 6. 

    A milling cutter having 8 teeth is rotating at 150 rpm. if the feed per tooth is 0.1 mm, the value of thew table speed in mm/min is

    • A.

      120

    • B.

      187

    • C.

      125

    • D.

      70

    Correct Answer
    A. 120
    Explanation
    The table speed is calculated by multiplying the number of teeth on the milling cutter by the rotation speed and the feed per tooth. In this case, the milling cutter has 8 teeth, the rotation speed is 150 rpm, and the feed per tooth is 0.1 mm. Therefore, the table speed would be 8 x 150 x 0.1 = 120 mm/min.

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  • 7. 

    In turning of slender rods, it is necessory to keep the transverse force minimium mainly to

    • A.

      Improve the surface finish

    • B.

      Increase productivity

    • C.

      Improve cutting efficiency

    • D.

      Reduce vibrations and chatter

    Correct Answer
    D. Reduce vibrations and chatter
    Explanation
    Reducing vibrations and chatter is necessary in turning slender rods because these phenomena can negatively impact the surface finish, productivity, and cutting efficiency. Vibrations and chatter can cause the tool to vibrate and chatter against the workpiece, leading to poor surface finish, increased tool wear, and decreased cutting efficiency. By minimizing the transverse force, the likelihood of vibrations and chatter occurring is reduced, resulting in improved overall machining performance.

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  • 8. 

    Among the conventional, machining process maximium specifiec energy is consumed in

    • A.

      Grinding

    • B.

      Drilling

    • C.

      Planing

    • D.

      Turnig

    Correct Answer
    A. Grinding
    Explanation
    Grinding consumes the maximum specific energy among the conventional machining processes. This is because grinding involves the use of abrasive particles to remove material from a workpiece, which requires a significant amount of energy. The abrasive particles continuously remove small chips from the workpiece surface, resulting in high friction and heat generation. This high energy consumption is necessary to achieve the desired surface finish and dimensional accuracy in grinding operations.

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  • 9. 

    Which of the following is true regarding milling machine

    • A.

      Up (climb) milling provides better surface finish while down milling provide longer tool life

    • B.

      Up milling provides longer tool life while down milling provide better surface finish

    • C.

      Up milling is provide both better tool life as well as better surface finish

    • D.

      Down milling provide better surface finish as well as longer tool life

    Correct Answer
    B. Up milling provides longer tool life while down milling provide better surface finish
    Explanation
    Up milling provides longer tool life while down milling provides better surface finish because in up milling, the cutting force is directed against the direction of the feed, which reduces the chances of tool wear and extends the tool's lifespan. On the other hand, in down milling, the cutting force is directed in the same direction as the feed, resulting in a smoother surface finish due to reduced vibrations and chatter.

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  • 10. 

    Which of the following is hardest materials next to diamond

    • A.

      Aluminium oxide

    • B.

      Silicon carbide

    • C.

      Cubic boron nitride

    • D.

      Cemented carbide

    Correct Answer
    C. Cubic boron nitride
    Explanation
    Cubic boron nitride is the hardest material next to diamond. It has a similar crystal structure to diamond, which gives it exceptional hardness and resistance to wear. This material is often used in cutting tools and abrasives for grinding and machining applications where high levels of hardness and durability are required.

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  • 11. 

    Consider the following statements regarding NC machine tools

    • A.

      They reduce non productive time

    • B.

      They reduce fixturing

    • C.

      Niether 1 nor 2

    • D.

      Both 1 and 2

    Correct Answer
    D. Both 1 and 2
    Explanation
    NC machine tools are able to reduce non-productive time and fixturing. Non-productive time refers to the time spent on tasks that do not directly contribute to the production process, such as setting up the machine or changing tools. NC machine tools can automate these tasks, reducing the time wasted on non-productive activities. Additionally, these tools can also minimize fixturing requirements by using computer-controlled positioning and alignment, eliminating the need for extensive manual adjustments and setups. Therefore, both statements 1 and 2 are correct.

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  • 12. 

    The bottles from thermo plastic materials are made by

    • A.

      Compression moulding

    • B.

      Extrusion with mandrel

    • C.

      Injection moulding

    • D.

      blow moulding

    Correct Answer
    D. blow moulding
    Explanation
    Blow molding is the correct answer because it is the process used to manufacture bottles from thermo plastic materials. In blow molding, a hollow tube of plastic called a parison is formed using either extrusion or injection molding. The parison is then placed in a mold, and air is blown into it, causing the plastic to expand and take the shape of the mold. This process is commonly used for producing bottles and other hollow plastic objects.

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  • 13. 

    The process of producing components in moulds without the application of pressure, is known as

    • A.

      Moulding

    • B.

      Laminating

    • C.

      Casting

    • D.

      Calendering

    Correct Answer
    C. Casting
    Explanation
    Casting is the correct answer because it refers to the process of producing components in moulds without the application of pressure. In casting, a liquid material, such as metal or plastic, is poured into a mould and allowed to solidify. This process is commonly used in manufacturing to create various products, such as metal parts, sculptures, and even dental restorations. Unlike moulding, laminating, and calendering, casting does not involve the application of pressure to shape the material.

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  • 14. 

    Which of the following materials used for car tyres as a standard material

    • A.

      Styrene butadiene rubber

    • B.

      Butyl rubber

    • C.

      Nitrile rubber

    • D.

      Any one of the above

    Correct Answer
    A. Styrene butadiene rubber
    Explanation
    Styrene butadiene rubber (SBR) is commonly used as a standard material for car tires. It is a synthetic rubber that offers a good balance of durability, traction, and fuel efficiency. SBR is known for its excellent abrasion resistance and high tensile strength, making it suitable for withstanding the demands of everyday driving. Additionally, SBR provides good grip on both wet and dry surfaces, ensuring safety on the road. Due to these properties, SBR is widely used in the automotive industry as a standard material for car tires.

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  • 15. 

    In powder metallurgy, the operation carried out to improve the bearing property of a bush is called

    • A.

      Infilteration

    • B.

      Impregnation

    • C.

      Plating

    • D.

      Sintering

    Correct Answer
    B. Impregnation
    Explanation
    Impregnation is the operation carried out in powder metallurgy to improve the bearing property of a bush. This process involves filling the porous structure of the bush with a lubricant or a solid material to enhance its performance and reduce friction. Impregnation helps to increase the load-carrying capacity and wear resistance of the bush, making it suitable for bearing applications.

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  • 16. 

    Deep hole drilling of small diameter say 0.2 mm is done with EDM by selecting the tool material as

    • A.

      Copper wire

    • B.

      Graphite

    • C.

      Brass wire

    • D.

      Tungston wire

    Correct Answer
    D. Tungston wire
    Explanation
    Tungsten wire is the most suitable tool material for deep hole drilling of small diameter using EDM. Tungsten has a high melting point, excellent conductivity, and good wear resistance, making it ideal for this application. It can withstand the high temperatures and electrical discharge during the drilling process without melting or deforming. Copper wire and brass wire have lower melting points and may not withstand the high temperatures involved. Graphite is a good conductor but lacks the necessary hardness and wear resistance for deep hole drilling. Therefore, tungsten wire is the best choice for this task.

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  • 17. 

    Which one of the followng principle responcible for metal removal rate in ultra sonic machining

    • A.

      Plastic shear

    • B.

      Melting and vapourization

    • C.

      Erosion and brittle fracture

    • D.

      Corrosive reaction

    Correct Answer
    B. Melting and vapourization
    Explanation
    The principle responsible for metal removal rate in ultrasonic machining is melting and vaporization. In this process, high-frequency vibrations are applied to a tool, which causes the tool to vibrate against the workpiece. The combination of the vibrations and the abrasive slurry applied between the tool and workpiece creates high temperatures, causing the material to melt and vaporize. This melting and vaporization of the material leads to the removal of metal from the workpiece, resulting in the desired machining effect.

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  • 18. 

    Cold shortness is defined as the

    • A.

      Fracture in room temperature below their recrystallization temperature

    • B.

      Brittelness in room temperature below their recrystallization temperature

    • C.

      Loss of ductility above recrystallization temperature

    • D.

      Decrease of brittleness in room temperature

    Correct Answer
    B. Brittelness in room temperature below their recrystallization temperature
    Explanation
    Cold shortness refers to the brittleness of a material at room temperature when it is below its recrystallization temperature. This means that the material becomes more prone to fracturing or breaking when exposed to stress or impact at lower temperatures. The loss of ductility and decrease in brittleness occur above the recrystallization temperature, not below it. Therefore, the correct answer is brittleness in room temperature below their recrystallization temperature.

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  • 19. 

    The compositions of some of the alloy steels are as under

    • A.

      18 W 4 Cr 1 V

    • B.

      12 Mo 1 W 4 Cr 1 V

    • C.

      6 Mo 6 W 4 Cr 1 V

    • D.

      18 W 8 Cr 1 V

    Correct Answer
    C. 6 Mo 6 W 4 Cr 1 V
    Explanation
    The answer "6 Mo 6 W 4 Cr 1 V" is the composition of an alloy steel. It indicates that the steel contains 6% Molybdenum (Mo), 6% Tungsten (W), 4% Chromium (Cr), and 1% Vanadium (V). The numbers represent the percentage of each element in the alloy. This composition suggests that the steel has a high content of Molybdenum and Tungsten, which are known for their strength and high-temperature resistance. The presence of Chromium and Vanadium also indicates that the steel can have good corrosion resistance and hardenability.

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  • 20. 

    The straigh grades of cemented carbide cutting tool materials contain

    • A.

      Tunsten Carbide only

    • B.

      Tungsten carbide and titanium carbide

    • C.

      Tungsten carbide and cobalt

    • D.

      Tungsten carbide and cobalt carbide

    Correct Answer
    C. Tungsten carbide and cobalt
    Explanation
    The correct answer is tungsten carbide and cobalt. Cemented carbide cutting tool materials are made by combining tungsten carbide, which provides hardness and wear resistance, with cobalt, which acts as a binder to hold the tungsten carbide particles together. This combination of tungsten carbide and cobalt results in a strong and durable cutting tool material that is commonly used in machining applications.

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  • 21. 

    In a mechanical shaper the length of stroke is increased by

    • A.

      increasing the centre distance of bull gear and crank pin

    • B.

      Decreasing the centre distance of bull gear and crank pin

    • C.

      Increasing the length of arm

    • D.

      Decreasing the length of slot in the slotted lever

    Correct Answer
    A. increasing the centre distance of bull gear and crank pin
    Explanation
    Increasing the center distance of the bull gear and crank pin in a mechanical shaper will increase the length of stroke. This is because the center distance determines the distance between the axis of rotation of the bull gear and the axis of rotation of the crank pin. By increasing this distance, the crank pin will have a larger circular path, resulting in a longer stroke of the shaper.

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  • 22. 

    A Grinding wheel of 150mm diameter is rotating at 3000 rpm. The grinding speed is

    • A.

      7.5 π m/s

    • B.

      15π m/s

    • C.

      45π m/s

    • D.

      450π m/s

    Correct Answer
    A. 7.5 π m/s
    Explanation
    The grinding speed can be calculated using the formula: speed = (π * diameter * rpm) / 60. Substituting the given values, we get (π * 150 * 3000) / 60 = 7.5π m/s.

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  • 23. 

    Trepanning is performed for

    • A.

      Finishing a drilled hole

    • B.

      Producing a Large hole without drilling

    • C.

      Truing a hole for Alignment

    • D.

      Enlarging a Drilled hole

    Correct Answer
    B. Producing a Large hole without drilling
    Explanation
    Trepanning is a machining process used to produce large holes in a workpiece without the need for drilling. It involves removing a solid disk-shaped piece of material from the center of the workpiece, leaving behind a large hole. This method is particularly useful when drilling a large hole using conventional drilling techniques is not feasible or practical. Trepanning can be performed using various tools and techniques, such as trepanning drills or trepanning heads, and is commonly used in industries such as aerospace, oil and gas, and automotive for applications that require large holes.

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  • 24. 

    A Lead Screw with half nuts in a lathe, Free to Rotate in both Direction has

    • A.

      V-threads

    • B.

      Whithworth threads

    • C.

      Buttress threads

    • D.

      ACME threads

    Correct Answer
    D. ACME threads
    Explanation
    ACME threads are the correct answer because they are commonly used in lead screws with half nuts in lathes. ACME threads have a trapezoidal shape with a 29-degree thread angle, which allows for smooth and efficient movement in both directions. They are designed to withstand heavy loads and provide high accuracy and repeatability. ACME threads are widely used in applications where precise linear motion is required, such as in CNC machines and industrial equipment.

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  • 25. 

    A Dynameter is a device used for the measurement of

    • A.

      Chip thickness ratio

    • B.

      Forces during metal cutting

    • C.

      Wear of the cutting tool

    • D.

      Deflection of cutting tool

    Correct Answer
    B. Forces during metal cutting
    Explanation
    A Dynameter is a device used to measure the forces that occur during metal cutting. This device helps in analyzing and understanding the forces that act on the cutting tool and the workpiece during the cutting process. By measuring these forces, it becomes possible to optimize the cutting parameters and improve the efficiency and quality of the cutting operation.

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  • 26. 

    In Centreless Grinding, The workpiece Centre will be

    • A.

      Above the line joining the two wheel centres

    • B.

      Below the line joining the centres

    • C.

      On the line joining the wheel centres

    • D.

      At the intersection of the of the line joining the wheel centres with the work plate plane

    Correct Answer
    A. Above the line joining the two wheel centres
    Explanation
    In centreless grinding, the workpiece is positioned above the line joining the two wheel centres. This is because centreless grinding is a machining process where the workpiece is supported by a work plate and does not require a center or chuck to hold it in place. The two grinding wheels rotate in opposite directions and the workpiece is fed between them. The workpiece is positioned above the line joining the wheel centres to ensure that it is properly supported and guided during the grinding process.

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  • 27. 

    The flux coating of an electric arc electrode has a melting point

    • A.

      Higher than metallic core

    • B.

      Lower than metallic core

    • C.

      The same as the metallic core

    • D.

      The same as the metal being welded

    Correct Answer
    A. Higher than metallic core
    Explanation
    The flux coating of an electric arc electrode has a melting point that is higher than the metallic core. This is because the flux coating is designed to provide a protective barrier during the welding process. It melts at a higher temperature than the metallic core to ensure that it remains intact and effectively shields the weld from contaminants and oxidation.

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  • 28. 

    Low Pressure Oxy Acetylene Welding is the name given to the welding Process in which

    • A.

      Oxygen is supplied in low pressure

    • B.

      Acetylene is supplied in Low pressure

    • C.

      Both Oxygen and Acetylene Supplied in Low Pressure

    • D.

      Mixing of oxygen and acetylene occured in low pressure

    Correct Answer
    B. Acetylene is supplied in Low pressure
    Explanation
    In Low Pressure Oxy Acetylene Welding, the correct answer is that Acetylene is supplied in Low pressure. This means that the acetylene gas used in the welding process is delivered at a lower pressure compared to other gases involved, such as oxygen. This is important because acetylene is highly flammable and can become unstable at higher pressures, posing a safety risk. By supplying acetylene at low pressure, the risk of accidents and explosions is reduced, making the welding process safer for the operator.

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  • 29. 

    Brasses and Bronze is welded by

    • A.

      Neutral Flame OAW

    • B.

      Reducing Flame OAW

    • C.

      Oxidising Flame OAW

    • D.

      MIG Welding

    Correct Answer
    C. Oxidising Flame OAW
    Explanation
    The correct answer is Oxidising Flame OAW. Oxidising Flame OAW (Oxy-Acetylene Welding) is suitable for welding brasses and bronze because it provides the right amount of oxygen to promote oxidation and remove impurities from the metal surface. This helps in achieving a clean and strong weld joint. The oxidizing flame has a slightly excess of oxygen compared to the fuel gas, which creates a hotter flame and ensures proper fusion of the base metals.

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  • 30. 

    The open Circuit Voltage OCV in arc welding ranges from

    • A.

      40 to 80 V

    • B.

      100 to 150 V

    • C.

      200 to 220 V

    • D.

      400 to 440 V

    Correct Answer
    A. 40 to 80 V
    Explanation
    The open circuit voltage (OCV) in arc welding typically ranges from 40 to 80 V. This voltage range is necessary to establish and maintain the arc between the welding electrode and the workpiece. It provides the necessary energy to ionize the air gap and create a conductive path for the electric current. Higher OCV values may be used for specific welding processes or materials, but the 40 to 80 V range is commonly used for general arc welding applications.

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  • 31. 

    The correct sequence of the given materials in descending order of their weldability is

    • A.

      Mild steel, Copper, Cast Iron, Al

    • B.

      Cast iron, Al, Mild steel, Copper

    • C.

      Copper, Cast iron, Mild steel, Al

    • D.

      Al, Cast iron, Copper, Mild steel

    Correct Answer
    A. Mild steel, Copper, Cast Iron, Al
    Explanation
    The correct sequence of materials in descending order of their weldability is mild steel, copper, cast iron, and aluminum. This means that mild steel has the highest weldability, followed by copper, cast iron, and aluminum. Weldability refers to how easily a material can be welded or joined together using various welding techniques. In this case, mild steel is the most weldable material, while aluminum is the least weldable.

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  • 32. 

    By Doping impurities. The electrical conductivity of semiconducter is

    • A.

      Increase

    • B.

      Decrease

    • C.

      Remains same

    • D.

      Not of the above

    Correct Answer
    A. Increase
    Explanation
    The electrical conductivity of a semiconductor can be increased by doping impurities. Doping refers to the intentional introduction of impurities into a semiconductor material to alter its electrical properties. By adding impurities, additional charge carriers are introduced, either by creating extra electrons (n-type doping) or by creating electron deficiencies called "holes" (p-type doping). These extra charge carriers increase the electrical conductivity of the semiconductor, allowing it to conduct electricity more effectively. Therefore, the correct answer is "increase".

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  • 33. 

    Which one of the ountry is the largest producer of Gold

    • A.

      Australiya

    • B.

      South africa

    • C.

      USA

    • D.

      England

    Correct Answer
    B. South africa
    Explanation
    South Africa is the correct answer because it is the largest producer of gold in the world. The country has been a major player in the gold industry for many years and has significant gold reserves. South Africa's gold production is attributed to its rich mineral deposits and well-established mining infrastructure. The country's gold mining industry contributes significantly to its economy and has made South Africa a global leader in gold production.

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  • 34. 

    Which one of the Equipments used to Transform Mechanical energy into Electrical energy

    • A.

      Electric motor

    • B.

      Dynamo

    • C.

      Mechanical Engine

    • D.

      Loudspeaker

    Correct Answer
    B. Dynamo
    Explanation
    A dynamo is a device that converts mechanical energy into electrical energy. It consists of a rotating coil of wire, called an armature, inside a magnetic field. When the armature rotates, it cuts through the magnetic field, inducing an electric current in the wire. This current can be used to power electrical devices or stored in batteries. In contrast, an electric motor converts electrical energy into mechanical energy, a mechanical engine converts chemical energy into mechanical energy, and a loudspeaker converts electrical energy into sound energy. Therefore, the correct answer is Dynamo.

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  • 35. 

    What is the value of Escape Velocity from the Earth Surface

    • A.

      11.2 km/s

    • B.

      2.4 km/s

    • C.

      1.732 km/s

    • D.

      22.4 km/s

    Correct Answer
    A. 11.2 km/s
    Explanation
    The value of escape velocity from the Earth's surface is 11.2 km/s. Escape velocity is the minimum velocity an object needs to escape the gravitational pull of a planet or celestial body. In this case, it refers to the speed required for an object to completely leave Earth's gravitational field. At 11.2 km/s, an object would have enough kinetic energy to overcome Earth's gravitational force and not be pulled back down.

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  • 36. 

    IRNSS Stands For The

    • A.

      Indian Remote Navigation Satellte System

    • B.

      Indian Regional Navigation Satellite System

    • C.

      Internation Remote Navigation Satellite System

    • D.

      International Regional Navigation Satellite System

    Correct Answer
    B. Indian Regional Navigation Satellite System
    Explanation
    The correct answer is Indian Regional Navigation Satellite System. IRNSS is an acronym for Indian Regional Navigation Satellite System, which is a satellite-based navigation system developed by the Indian Space Research Organisation (ISRO). It is designed to provide accurate positioning and timing services in India and the surrounding regions.

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  • 37. 

    Which one of thermodynamic Properties is not dependent upon the mass of substance

    • A.

      Kinectic Energy

    • B.

      Volume

    • C.

      Density

    • D.

      Entropy

    Correct Answer
    C. Density
    Explanation
    Density is a thermodynamic property that is not dependent upon the mass of a substance. Density is defined as the mass per unit volume of a substance. It is an intensive property, meaning it does not change with the amount of substance present. Therefore, even if the mass of a substance changes, its density remains the same as long as the volume remains constant. This makes density independent of the mass of the substance.

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  • 38. 

    During Phase change of Pure substance which of the following is not altered

    • A.

      Entropy

    • B.

      Volume

    • C.

      Density

    • D.

      Pressure

    Correct Answer
    D. Pressure
    Explanation
    During the phase change of a pure substance, the pressure remains constant. This is because phase change occurs at a specific temperature and pressure known as the boiling point or melting point. At this point, the substance undergoes a change in its physical state (solid to liquid or liquid to gas) while the pressure remains constant. Therefore, pressure is not altered during the phase change of a pure substance.

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  • 39. 

    If metallic wire is Streched doubled then speciefic resistance of wire will

    • A.

      Doubled

    • B.

      Halved

    • C.

      Remain same

    • D.

      Increase by four times

    Correct Answer
    C. Remain same
    Explanation
    When a metallic wire is stretched, its length increases while its cross-sectional area decreases. The specific resistance of a material is defined as the resistance of a wire of unit length and unit cross-sectional area. Since both the length and cross-sectional area change in the same proportion, the specific resistance remains constant. Therefore, when a metallic wire is stretched, its specific resistance will remain the same.

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  • 40. 

    Refractive index for light is defined as the

    • A.

      Ratio of speed of light in vaccum to speed of light in the medium

    • B.

      Ratio of speed of light in medium to speed of light in vaccum

    • C.

      Ratio of speed of light in denser medium to rarer medium

    • D.

      Ratio of speed of light rarer medium to that of denser medium

    Correct Answer
    A. Ratio of speed of light in vaccum to speed of light in the medium
    Explanation
    The refractive index for light is defined as the ratio of the speed of light in vacuum to the speed of light in the medium. This means that it measures how much the speed of light changes when it passes from vacuum to a particular medium. The higher the refractive index, the slower the speed of light in that medium compared to vacuum.

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  • 41. 

    For computer application the word EDOROM stands for the

    • A.

      Extended Date output Random Access Memory

    • B.

      Erasable Date output Random Access memory

    • C.

      Extended default output Random Access memory

    • D.

      Erasable Default output Random access memory

    Correct Answer
    A. Extended Date output Random Access Memory
    Explanation
    The correct answer is "Extended Date output Random Access Memory". EDOROM is a term used in computer applications to refer to a type of memory that allows for extended dates to be stored and accessed randomly. This type of memory is capable of outputting data and can be erased if needed.

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  • 42. 

    Antivius is a

    • A.

      System software

    • B.

      Application software

    • C.

      Utilities software

    • D.

      None of the above

    Correct Answer
    C. Utilities software
    Explanation
    Antivirus software is categorized as utilities software because it is designed to perform specific tasks that help maintain and optimize the computer system. Antivirus software is primarily used to detect, prevent, and remove malicious software (such as viruses, worms, and Trojans) from a computer. It helps in protecting the system from potential threats and ensuring its smooth functioning. Therefore, the correct answer is utilities software.

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  • 43. 

    The word HTTP is stand for

    • A.

      Hyper text transfer protocal

    • B.

      Hyper text transfer point

    • C.

      Hyper text tabulated programm

    • D.

      None of the above

    Correct Answer
    A. Hyper text transfer protocal
    Explanation
    The correct answer is "hyper text transfer protocol." HTTP stands for Hyper Text Transfer Protocol, which is a protocol used for transmitting hypertext over the internet. It is the foundation of data communication for the World Wide Web.

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  • 44. 

    The famous super computer PARAM-10000 is developed by

    • A.

      DRDO

    • B.

      C-DAC, Pune

    • C.

      C-Dot, Banglore

    • D.

      IIT-Bombay

    Correct Answer
    B. C-DAC, Pune
    Explanation
    The famous supercomputer PARAM-10000 was developed by C-DAC, Pune. C-DAC, also known as the Centre for Development of Advanced Computing, is a research and development organization under the Ministry of Electronics and Information Technology, Government of India. They are known for their expertise in high-performance computing and have developed several supercomputers in India.

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  • 45. 

    Presently Which one of the Following is a chief minister of Uttarakhand

    • A.

      Jitan Ram manjhi

    • B.

      Prakash singh Badal

    • C.

      Vijay Bahuguna

    • D.

      Harish Rawat

    Correct Answer
    D. Harish Rawat
    Explanation
    Harish Rawat is the correct answer because he is presently serving as the Chief Minister of Uttarakhand. The other options, Jitan Ram Manjhi, Prakash Singh Badal, and Vijay Bahuguna, are not relevant to Uttarakhand and are not currently holding the position of Chief Minister in that state.

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  • 46. 

    The Detective agency "Research and analysis wing" is the intelligence agency of

    • A.

      USA

    • B.

      Australia

    • C.

      India

    • D.

      United Kingdom

    Correct Answer
    C. India
    Explanation
    The correct answer is India because the detective agency "Research and Analysis Wing" is commonly known as RAW, which is the primary foreign intelligence agency of India. It is responsible for gathering and analyzing intelligence information from foreign countries to assist in national security and foreign policy decision-making. RAW plays a crucial role in safeguarding India's interests and ensuring the country's security.

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  • 47. 

    In FIFA 2014 Woldcup the Golden boot award winner " James Rodrigreze" is player of which country

    • A.

      Germany

    • B.

      Brazil

    • C.

      Argentina

    • D.

      Columbia

    Correct Answer
    D. Columbia
    Explanation
    James Rodriguez, the winner of the Golden Boot award in the 2014 FIFA World Cup, is from Colombia.

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  • 48. 

    Which one of the following is a cabinet minister of Agriculture Department

    • A.

      Radha Mohan Singh

    • B.

      Thavar singh Gehlot

    • C.

      Kalraj Mishra

    • D.

      M. Vainkaiya Naidu

    Correct Answer
    A. Radha Mohan Singh
    Explanation
    Radha Mohan Singh is a cabinet minister of the Agriculture Department.

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  • 49. 

    Which one of the following instrument used in Light Detector Test

    • A.

      Polygraph

    • B.

      Udometer

    • C.

      Cardiogram

    • D.

      Odometer

    Correct Answer
    A. Polygraph
    Explanation
    A polygraph is an instrument used in a Light Detector Test. A polygraph, also known as a lie detector, measures and records several physiological indicators such as blood pressure, pulse, respiration, and skin conductivity while a person is being questioned. It is commonly used in investigations or interrogations to determine if someone is being truthful or deceptive.

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  • 50. 

    The National institute for Oceanography is situated in

    • A.

      Panaji

    • B.

      Pune

    • C.

      Bangalore

    • D.

      Roorkee

    Correct Answer
    A. Panaji
    Explanation
    The National Institute for Oceanography is situated in Panaji. Panaji is the capital city of the Indian state of Goa, which is known for its beautiful beaches and coastal areas. It is an ideal location for the National Institute for Oceanography as it provides easy access to the Arabian Sea and a diverse marine ecosystem for research and study purposes.

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Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 22, 2014
    Quiz Created by
    Royalmech
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