[1] When a ship enters the sea from a river what will be the effect?
A.
It lowers
B.
It sways
C.
It rises a little
D.
It jolts
Ans:
It rises a little
Explanation :
When a ship enters the sea from a river, it rises a little since salt water is denser than river water. As the density of river water is less than that of the sea water, the water displaced by the ship in the river is more than that displaced in the sea. So it rises as it enters sea from river.
[2] Hydroscope is an instrument that shows changes in:
A.
Sound under water
B.
Atmospheric humidity
C.
Density of liquid
D.
None of these
Ans:
None of these
Explanation :
Hydroscope is an optical device for enabling a person to see an object at a considerable distance below the surface of water by means of a series of mirrors enclosed in a steel tube. Hydrophone is an instrument used for recording sound under water. It is the underwater equivalent of a microphone that measures pressure fluctuations, and these are usually converted to sound pressure level (SPL), a logarithmic measure of the mean square acoustic pressure.
[3] Unit of resistance is –
A.
volt² x ampere
B.
volt/ampere
C.
ampere/volt
D.
volt x ampere
Ans:
volt/ampere
Explanation :
An ohm (0) is the SI derived unit of electrical resistance. By definition, a conductor has an electrical resistance of one ohm when a constant potential difference of one volt applied between its ends produces in this conductor a current of one ampere. A volt per ampere (WA) is the SI derived unit, which is equal to ohm by definition 0 = V/A.
[4] A cycle tyre bursts suddenly. This represents an –
A.
Isothermal process
B.
Adiabatic process
C.
Isochoric process
D.
Isoboric process
Ans:
Adiabatic process
Explanation :
When a tyre bursts suddenly energy is not immediately transferred between the system and the surrounding. So the process is adiabatic. There sudden expansion of its air into the atmosphere is adiabatic and the tyre is cooled. In adiabatic process, heat neither enters the system nor leaves the system.
[5] Global warming is expected to result in -
A.
increase in level of sea
B.
change in crop pattern
C.
change in coastline
D.
All of the above
Ans:
All of the above
Explanation :
Global warming is projected to have a number of effects on the oceans. Ongoing effects include rising sea levels due to thermal expansion and melting of glaciers and ice sheets, and warming of the ocean surface, leading to increased temperature stratification.
[6] Which is best used as a sound absorbing material in partition walls?
A.
Stone chips
B.
Steel
C.
Glass – wool
D.
Glass pieces
Ans:
Glass – wool
Explanation :
Materials that do not transfer mechanical energy well. These tend to be soft, flexible, low density, and with high surface area to linear area ratios.
[7] The dimensional formula ML⁻¹T⁻² corresponds to –
A.
Modulus of elasticity
B.
Viscosity
C.
Moment of a force
D.
Thrust
Ans:
Modulus of elasticity
Explanation :
ML⁻¹T⁻² is the dimension of any quantity that is force per unit area such as Pressure or Stress, Young's Modulus, Bulk Modulus, Modulus of Rigidity, Energy Density. The Modulus of Elasticity is the ratio of the stress applied to a body or substance to the resulting strain within the elastic limit.
[8] Purity of a metal can be determined with the help of –
A.
Pascal's law
B.
Boyle's law
C.
Archimedes principle
D.
Conservation of mass principle
Ans:
Archimedes principle
Explanation :
Purity of a metal can be determined with the help of Archimedes Principle which makes use of the densities and buoyancy of metals. Finding the density of a metal sample can help to determine its purity. It is most commonly used in the checking the purity of gold.
[9] If both the mass and the velocity of a body is increased to twice of their magnitude, the kinetic energy will increase by –
A.
2 times
B.
4 times
C.
8 times
D.
16 times
Ans:
4 times
Explanation :
0
[10] Which phenomenon is responsible for the echo of sound wave?
A.
Reflection
B.
Refraction
C.
Interference
D.
Polarization
Ans:
Reflection
Explanation :
Reflection of sound waves off of surfaces lead to one of two phenomena - an echo or a reverberation. The echo is produced due to hitting of the sound waves with the obstacles which makes the Sound to reflect back. Echoes occur when a reflected sound wave reaches the ear more than 0.1 seconds after the original sound wave was heard.
[11] Which of the following has the lowest frequency?
A.
Visible light
B.
Gamma rays
C.
Xrays
D.
Ultra violet rays
Ans:
Visible light
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide over current protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[12] A fresh egg when placed in salt water will –
A.
sink and go to the bottom
B.
sink but will not go to the bottom
C.
float
D.
burst
Ans:
float
Explanation :
When a fresh egg is placed in regular water, it sinks. However, when the same egg is placed in saltwater, it floats. This is because salt water is denser than the egg causing it to float.
[13] What is the unit of relative density?
A.
kg/m
B.
kg/m²
C.
kg/m³
D.
It has no unit
Ans:
It has no unit
Explanation :
Relative density is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. So, it is a dimensionless quantity and has no unit.
[14] Hydraulic brakes in automobile work on –
A.
Poiseuille's principle
B.
Pascal's principle
C.
Archimedes' principle
D.
Bernoulli's principle
Ans:
Pascal's principle
Explanation :
The hydraulic brake is an arrangement of braking mechanism which uses brake fluid, typically containing glycol ethers or diethylene glycol, to transfer pressure from the controlling mechanism to the braking mechanism. It works on the principle of Pascal's law which states that "pressure at a point in a fluid is equal in all directions in space". When pressure is applied on a fluid it travels equally in all directions so that uniform braking action is applied on all wheels.
[15] The gas used in a refrigerator is -
A.
cooled down on flowing
B.
heated up on flowing
C.
cooled down when compressed
D.
cooled down when expanded
Ans:
cooled down when expanded
Explanation :
Common refrigerants used in various applications are ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as propane. Compressing these gasses into liquids they are made to give up their heat.
[16] The main purpose of the spacecraft "messenger" is :
A.
Orbiting the Venus
B.
Orbiting the Mars
C.
Mapping and investigating the Mercury
D.
None of the above
Ans:
Mapping and investigating the Mercury
Explanation :
Messenger (stylized as MESSENGER, whose backronym is Mercury Surface, Space Environment, Geochemistry, and Ranging") was spacecraft that orbited the planet Mercury between 2011 and 2015.
[17] Light scattering takes place in –
A.
Colloidal solutions
B.
Acidic solutions
C.
Electrolyte solutions
D.
Basic solutions
Ans:
Colloidal solutions
Explanation :
Light scattering in colloidal solutions or particles in suspension is known as Tyndall Effect. It is similar to Rayleigh scattering, in that the intensity of the scattered light depends on the fourth power of the frequency, so blue light is scattered much more strongly than red light.
[18] The term reactor referred to in waste water treatment is –
A.
Vessel
B.
Settling tank
C.
Clarifier
D.
Aeration tank
Ans:
Aeration tank
Explanation :
Reactors are industrial processing tanks for the treatment of wastewater. The tanks have a "flow through" system, with raw wastewater (influent) coming in at one end and treated water (effluent) flowing out the other. While one tank is in settle/ decant mode the other is aerating and filling.
[19] The dimension MLT⁻² corresponds to –
A.
force
B.
work done
C.
acceleration
D.
velocity
Ans:
force
Explanation :
The dimensions of Force are M (mass), L (length) and T-2 (time). It can also be expressed as [newton] = [kilogram] [metre] [second]-2.
[20] Good conductors have many loosely bound _.
A.
neutrons
B.
protons
C.
positron
D.
electrons
Ans:
electrons
Explanation :
In a conductor, the outer electrons of the atoms are loosely bound and free to move through the material.
[21] Cactus is referred to as -
A.
Hydrophyte
B.
Mesophyte
C.
Xerophyte
D.
Epiphyte
Ans:
Xerophyte
Explanation :
Cactus is a xerophyte as it specializes in surviving in hot and dry environments. Xerophytes are plants that are adapted to survive in an environment with little water, such as a desert or an ice- or snowcovered region in the Alps or the Arctic.
[22] Which, of the following radiations has the least wavelength?
A.
X-rays
B.
a-rays
C.
g-rays
D.
b-rays
Ans:
g-rays
Explanation :
X-rays - smaller than 10 nano metre gamma- rays - 0.0005 to 0.1 nano metre alpha-rays - 125 nano metre
[23] What is the physical state of water at 12° C?
A.
Gas
B.
Solid
C.
Liquid
D.
Ionic
Ans:
Liquid
Explanation :
Water can occur in thretates solid (ice), liquid gas (vapor). It is liquid at 12 Celsius. This i s the form water with which we are most familiar.
[24] Change in quality of environment that can be harmful and unpleasant for living things is called –
A.
Energy
B.
Pollution
C.
Revolution
D.
Transformation
Ans:
Pollution
Explanation :
A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource.
[25] Which among the following lens is used to correct Presbyopia?
A.
Concave
B.
Convex
C.
Cylindrical
D.
Bifocal
Ans:
Bifocal
Explanation :
In Presbyopia defect both near and far object are not clearly visible i.e., far point is lesser than infinity and near point greater than 25 cm. This can be removed either by using two separate spectacles one for myopia and other for hypermetropia or by using bifocal lens. It is an old age disease. At old age ciliary muscles lose their elasticity so they can not change the focal length of eye lens effectively and eye losses its power of accommodation
Explanation :
When a ship enters the sea from a river, it rises a little since salt water is denser than river water. As the density of river water is less than that of the sea water, the water displaced by the ship in the river is more than that displaced in the sea. So it rises as it enters sea from river.
[2] Hydroscope is an instrument that shows changes in:
A.
Sound under water
B.
Atmospheric humidity
C.
Density of liquid
D.
None of these
Ans:
None of these
Explanation :
Hydroscope is an optical device for enabling a person to see an object at a considerable distance below the surface of water by means of a series of mirrors enclosed in a steel tube. Hydrophone is an instrument used for recording sound under water. It is the underwater equivalent of a microphone that measures pressure fluctuations, and these are usually converted to sound pressure level (SPL), a logarithmic measure of the mean square acoustic pressure.
[3] Unit of resistance is –
A.
volt² x ampere
B.
volt/ampere
C.
ampere/volt
D.
volt x ampere
Ans:
volt/ampere
Explanation :
An ohm (0) is the SI derived unit of electrical resistance. By definition, a conductor has an electrical resistance of one ohm when a constant potential difference of one volt applied between its ends produces in this conductor a current of one ampere. A volt per ampere (WA) is the SI derived unit, which is equal to ohm by definition 0 = V/A.
[4] A cycle tyre bursts suddenly. This represents an –
A.
Isothermal process
B.
Adiabatic process
C.
Isochoric process
D.
Isoboric process
Ans:
Adiabatic process
Explanation :
When a tyre bursts suddenly energy is not immediately transferred between the system and the surrounding. So the process is adiabatic. There sudden expansion of its air into the atmosphere is adiabatic and the tyre is cooled. In adiabatic process, heat neither enters the system nor leaves the system.
[5] Global warming is expected to result in -
A.
increase in level of sea
B.
change in crop pattern
C.
change in coastline
D.
All of the above
Ans:
All of the above
Explanation :
Global warming is projected to have a number of effects on the oceans. Ongoing effects include rising sea levels due to thermal expansion and melting of glaciers and ice sheets, and warming of the ocean surface, leading to increased temperature stratification.
[6] Which is best used as a sound absorbing material in partition walls?
A.
Stone chips
B.
Steel
C.
Glass – wool
D.
Glass pieces
Ans:
Glass – wool
Explanation :
Materials that do not transfer mechanical energy well. These tend to be soft, flexible, low density, and with high surface area to linear area ratios.
[7] The dimensional formula ML⁻¹T⁻² corresponds to –
A.
Modulus of elasticity
B.
Viscosity
C.
Moment of a force
D.
Thrust
Ans:
Modulus of elasticity
Explanation :
ML⁻¹T⁻² is the dimension of any quantity that is force per unit area such as Pressure or Stress, Young's Modulus, Bulk Modulus, Modulus of Rigidity, Energy Density. The Modulus of Elasticity is the ratio of the stress applied to a body or substance to the resulting strain within the elastic limit.
[8] Purity of a metal can be determined with the help of –
A.
Pascal's law
B.
Boyle's law
C.
Archimedes principle
D.
Conservation of mass principle
Ans:
Archimedes principle
Explanation :
Purity of a metal can be determined with the help of Archimedes Principle which makes use of the densities and buoyancy of metals. Finding the density of a metal sample can help to determine its purity. It is most commonly used in the checking the purity of gold.
[9] If both the mass and the velocity of a body is increased to twice of their magnitude, the kinetic energy will increase by –
A.
2 times
B.
4 times
C.
8 times
D.
16 times
Ans:
4 times
Explanation :
0
[10] Which phenomenon is responsible for the echo of sound wave?
A.
Reflection
B.
Refraction
C.
Interference
D.
Polarization
Ans:
Reflection
Explanation :
Reflection of sound waves off of surfaces lead to one of two phenomena - an echo or a reverberation. The echo is produced due to hitting of the sound waves with the obstacles which makes the Sound to reflect back. Echoes occur when a reflected sound wave reaches the ear more than 0.1 seconds after the original sound wave was heard.
[11] Which of the following has the lowest frequency?
A.
Visible light
B.
Gamma rays
C.
Xrays
D.
Ultra violet rays
Ans:
Visible light
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide over current protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[12] A fresh egg when placed in salt water will –
A.
sink and go to the bottom
B.
sink but will not go to the bottom
C.
float
D.
burst
Ans:
float
Explanation :
When a fresh egg is placed in regular water, it sinks. However, when the same egg is placed in saltwater, it floats. This is because salt water is denser than the egg causing it to float.
[13] What is the unit of relative density?
A.
kg/m
B.
kg/m²
C.
kg/m³
D.
It has no unit
Ans:
It has no unit
Explanation :
Relative density is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. So, it is a dimensionless quantity and has no unit.
[14] Hydraulic brakes in automobile work on –
A.
Poiseuille's principle
B.
Pascal's principle
C.
Archimedes' principle
D.
Bernoulli's principle
Ans:
Pascal's principle
Explanation :
The hydraulic brake is an arrangement of braking mechanism which uses brake fluid, typically containing glycol ethers or diethylene glycol, to transfer pressure from the controlling mechanism to the braking mechanism. It works on the principle of Pascal's law which states that "pressure at a point in a fluid is equal in all directions in space". When pressure is applied on a fluid it travels equally in all directions so that uniform braking action is applied on all wheels.
[15] The gas used in a refrigerator is -
A.
cooled down on flowing
B.
heated up on flowing
C.
cooled down when compressed
D.
cooled down when expanded
Ans:
cooled down when expanded
Explanation :
Common refrigerants used in various applications are ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as propane. Compressing these gasses into liquids they are made to give up their heat.
[16] The main purpose of the spacecraft "messenger" is :
A.
Orbiting the Venus
B.
Orbiting the Mars
C.
Mapping and investigating the Mercury
D.
None of the above
Ans:
Mapping and investigating the Mercury
Explanation :
Messenger (stylized as MESSENGER, whose backronym is Mercury Surface, Space Environment, Geochemistry, and Ranging") was spacecraft that orbited the planet Mercury between 2011 and 2015.
[17] Light scattering takes place in –
A.
Colloidal solutions
B.
Acidic solutions
C.
Electrolyte solutions
D.
Basic solutions
Ans:
Colloidal solutions
Explanation :
Light scattering in colloidal solutions or particles in suspension is known as Tyndall Effect. It is similar to Rayleigh scattering, in that the intensity of the scattered light depends on the fourth power of the frequency, so blue light is scattered much more strongly than red light.
[18] The term reactor referred to in waste water treatment is –
A.
Vessel
B.
Settling tank
C.
Clarifier
D.
Aeration tank
Ans:
Aeration tank
Explanation :
Reactors are industrial processing tanks for the treatment of wastewater. The tanks have a "flow through" system, with raw wastewater (influent) coming in at one end and treated water (effluent) flowing out the other. While one tank is in settle/ decant mode the other is aerating and filling.
[19] The dimension MLT⁻² corresponds to –
A.
force
B.
work done
C.
acceleration
D.
velocity
Ans:
force
Explanation :
The dimensions of Force are M (mass), L (length) and T-2 (time). It can also be expressed as [newton] = [kilogram] [metre] [second]-2.
[20] Good conductors have many loosely bound _.
A.
neutrons
B.
protons
C.
positron
D.
electrons
Ans:
electrons
Explanation :
In a conductor, the outer electrons of the atoms are loosely bound and free to move through the material.
[21] Cactus is referred to as -
A.
Hydrophyte
B.
Mesophyte
C.
Xerophyte
D.
Epiphyte
Ans:
Xerophyte
Explanation :
Cactus is a xerophyte as it specializes in surviving in hot and dry environments. Xerophytes are plants that are adapted to survive in an environment with little water, such as a desert or an ice- or snowcovered region in the Alps or the Arctic.
[22] Which, of the following radiations has the least wavelength?
A.
X-rays
B.
a-rays
C.
g-rays
D.
b-rays
Ans:
g-rays
Explanation :
X-rays - smaller than 10 nano metre gamma- rays - 0.0005 to 0.1 nano metre alpha-rays - 125 nano metre
[23] What is the physical state of water at 12° C?
A.
Gas
B.
Solid
C.
Liquid
D.
Ionic
Ans:
Liquid
Explanation :
Water can occur in thretates solid (ice), liquid gas (vapor). It is liquid at 12 Celsius. This i s the form water with which we are most familiar.
[24] Change in quality of environment that can be harmful and unpleasant for living things is called –
A.
Energy
B.
Pollution
C.
Revolution
D.
Transformation
Ans:
Pollution
Explanation :
A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource.
[25] Which among the following lens is used to correct Presbyopia?
A.
Concave
B.
Convex
C.
Cylindrical
D.
Bifocal
Ans:
Bifocal
Explanation :
In Presbyopia defect both near and far object are not clearly visible i.e., far point is lesser than infinity and near point greater than 25 cm. This can be removed either by using two separate spectacles one for myopia and other for hypermetropia or by using bifocal lens. It is an old age disease. At old age ciliary muscles lose their elasticity so they can not change the focal length of eye lens effectively and eye losses its power of accommodation
Explanation :
An ohm (0) is the SI derived unit of electrical resistance. By definition, a conductor has an electrical resistance of one ohm when a constant potential difference of one volt applied between its ends produces in this conductor a current of one ampere. A volt per ampere (WA) is the SI derived unit, which is equal to ohm by definition 0 = V/A.
[4] A cycle tyre bursts suddenly. This represents an –
A.
Isothermal process
B.
Adiabatic process
C.
Isochoric process
D.
Isoboric process
Ans:
Adiabatic process
Explanation :
When a tyre bursts suddenly energy is not immediately transferred between the system and the surrounding. So the process is adiabatic. There sudden expansion of its air into the atmosphere is adiabatic and the tyre is cooled. In adiabatic process, heat neither enters the system nor leaves the system.
[5] Global warming is expected to result in -
A.
increase in level of sea
B.
change in crop pattern
C.
change in coastline
D.
All of the above
Ans:
All of the above
Explanation :
Global warming is projected to have a number of effects on the oceans. Ongoing effects include rising sea levels due to thermal expansion and melting of glaciers and ice sheets, and warming of the ocean surface, leading to increased temperature stratification.
[6] Which is best used as a sound absorbing material in partition walls?
A.
Stone chips
B.
Steel
C.
Glass – wool
D.
Glass pieces
Ans:
Glass – wool
Explanation :
Materials that do not transfer mechanical energy well. These tend to be soft, flexible, low density, and with high surface area to linear area ratios.
[7] The dimensional formula ML⁻¹T⁻² corresponds to –
A.
Modulus of elasticity
B.
Viscosity
C.
Moment of a force
D.
Thrust
Ans:
Modulus of elasticity
Explanation :
ML⁻¹T⁻² is the dimension of any quantity that is force per unit area such as Pressure or Stress, Young's Modulus, Bulk Modulus, Modulus of Rigidity, Energy Density. The Modulus of Elasticity is the ratio of the stress applied to a body or substance to the resulting strain within the elastic limit.
[8] Purity of a metal can be determined with the help of –
A.
Pascal's law
B.
Boyle's law
C.
Archimedes principle
D.
Conservation of mass principle
Ans:
Archimedes principle
Explanation :
Purity of a metal can be determined with the help of Archimedes Principle which makes use of the densities and buoyancy of metals. Finding the density of a metal sample can help to determine its purity. It is most commonly used in the checking the purity of gold.
[9] If both the mass and the velocity of a body is increased to twice of their magnitude, the kinetic energy will increase by –
A.
2 times
B.
4 times
C.
8 times
D.
16 times
Ans:
4 times
Explanation :
0
[10] Which phenomenon is responsible for the echo of sound wave?
A.
Reflection
B.
Refraction
C.
Interference
D.
Polarization
Ans:
Reflection
Explanation :
Reflection of sound waves off of surfaces lead to one of two phenomena - an echo or a reverberation. The echo is produced due to hitting of the sound waves with the obstacles which makes the Sound to reflect back. Echoes occur when a reflected sound wave reaches the ear more than 0.1 seconds after the original sound wave was heard.
[11] Which of the following has the lowest frequency?
A.
Visible light
B.
Gamma rays
C.
Xrays
D.
Ultra violet rays
Ans:
Visible light
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide over current protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[12] A fresh egg when placed in salt water will –
A.
sink and go to the bottom
B.
sink but will not go to the bottom
C.
float
D.
burst
Ans:
float
Explanation :
When a fresh egg is placed in regular water, it sinks. However, when the same egg is placed in saltwater, it floats. This is because salt water is denser than the egg causing it to float.
[13] What is the unit of relative density?
A.
kg/m
B.
kg/m²
C.
kg/m³
D.
It has no unit
Ans:
It has no unit
Explanation :
Relative density is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. So, it is a dimensionless quantity and has no unit.
[14] Hydraulic brakes in automobile work on –
A.
Poiseuille's principle
B.
Pascal's principle
C.
Archimedes' principle
D.
Bernoulli's principle
Ans:
Pascal's principle
Explanation :
The hydraulic brake is an arrangement of braking mechanism which uses brake fluid, typically containing glycol ethers or diethylene glycol, to transfer pressure from the controlling mechanism to the braking mechanism. It works on the principle of Pascal's law which states that "pressure at a point in a fluid is equal in all directions in space". When pressure is applied on a fluid it travels equally in all directions so that uniform braking action is applied on all wheels.
[15] The gas used in a refrigerator is -
A.
cooled down on flowing
B.
heated up on flowing
C.
cooled down when compressed
D.
cooled down when expanded
Ans:
cooled down when expanded
Explanation :
Common refrigerants used in various applications are ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as propane. Compressing these gasses into liquids they are made to give up their heat.
[16] The main purpose of the spacecraft "messenger" is :
A.
Orbiting the Venus
B.
Orbiting the Mars
C.
Mapping and investigating the Mercury
D.
None of the above
Ans:
Mapping and investigating the Mercury
Explanation :
Messenger (stylized as MESSENGER, whose backronym is Mercury Surface, Space Environment, Geochemistry, and Ranging") was spacecraft that orbited the planet Mercury between 2011 and 2015.
[17] Light scattering takes place in –
A.
Colloidal solutions
B.
Acidic solutions
C.
Electrolyte solutions
D.
Basic solutions
Ans:
Colloidal solutions
Explanation :
Light scattering in colloidal solutions or particles in suspension is known as Tyndall Effect. It is similar to Rayleigh scattering, in that the intensity of the scattered light depends on the fourth power of the frequency, so blue light is scattered much more strongly than red light.
[18] The term reactor referred to in waste water treatment is –
A.
Vessel
B.
Settling tank
C.
Clarifier
D.
Aeration tank
Ans:
Aeration tank
Explanation :
Reactors are industrial processing tanks for the treatment of wastewater. The tanks have a "flow through" system, with raw wastewater (influent) coming in at one end and treated water (effluent) flowing out the other. While one tank is in settle/ decant mode the other is aerating and filling.
[19] The dimension MLT⁻² corresponds to –
A.
force
B.
work done
C.
acceleration
D.
velocity
Ans:
force
Explanation :
The dimensions of Force are M (mass), L (length) and T-2 (time). It can also be expressed as [newton] = [kilogram] [metre] [second]-2.
[20] Good conductors have many loosely bound _.
A.
neutrons
B.
protons
C.
positron
D.
electrons
Ans:
electrons
Explanation :
In a conductor, the outer electrons of the atoms are loosely bound and free to move through the material.
[21] Cactus is referred to as -
A.
Hydrophyte
B.
Mesophyte
C.
Xerophyte
D.
Epiphyte
Ans:
Xerophyte
Explanation :
Cactus is a xerophyte as it specializes in surviving in hot and dry environments. Xerophytes are plants that are adapted to survive in an environment with little water, such as a desert or an ice- or snowcovered region in the Alps or the Arctic.
[22] Which, of the following radiations has the least wavelength?
A.
X-rays
B.
a-rays
C.
g-rays
D.
b-rays
Ans:
g-rays
Explanation :
X-rays - smaller than 10 nano metre gamma- rays - 0.0005 to 0.1 nano metre alpha-rays - 125 nano metre
[23] What is the physical state of water at 12° C?
A.
Gas
B.
Solid
C.
Liquid
D.
Ionic
Ans:
Liquid
Explanation :
Water can occur in thretates solid (ice), liquid gas (vapor). It is liquid at 12 Celsius. This i s the form water with which we are most familiar.
[24] Change in quality of environment that can be harmful and unpleasant for living things is called –
A.
Energy
B.
Pollution
C.
Revolution
D.
Transformation
Ans:
Pollution
Explanation :
A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource.
[25] Which among the following lens is used to correct Presbyopia?
A.
Concave
B.
Convex
C.
Cylindrical
D.
Bifocal
Ans:
Bifocal
Explanation :
In Presbyopia defect both near and far object are not clearly visible i.e., far point is lesser than infinity and near point greater than 25 cm. This can be removed either by using two separate spectacles one for myopia and other for hypermetropia or by using bifocal lens. It is an old age disease. At old age ciliary muscles lose their elasticity so they can not change the focal length of eye lens effectively and eye losses its power of accommodation
Explanation :
Global warming is projected to have a number of effects on the oceans. Ongoing effects include rising sea levels due to thermal expansion and melting of glaciers and ice sheets, and warming of the ocean surface, leading to increased temperature stratification.
[6] Which is best used as a sound absorbing material in partition walls?
A.
Stone chips
B.
Steel
C.
Glass – wool
D.
Glass pieces
Ans:
Glass – wool
Explanation :
Materials that do not transfer mechanical energy well. These tend to be soft, flexible, low density, and with high surface area to linear area ratios.
[7] The dimensional formula ML⁻¹T⁻² corresponds to –
A.
Modulus of elasticity
B.
Viscosity
C.
Moment of a force
D.
Thrust
Ans:
Modulus of elasticity
Explanation :
ML⁻¹T⁻² is the dimension of any quantity that is force per unit area such as Pressure or Stress, Young's Modulus, Bulk Modulus, Modulus of Rigidity, Energy Density. The Modulus of Elasticity is the ratio of the stress applied to a body or substance to the resulting strain within the elastic limit.
[8] Purity of a metal can be determined with the help of –
A.
Pascal's law
B.
Boyle's law
C.
Archimedes principle
D.
Conservation of mass principle
Ans:
Archimedes principle
Explanation :
Purity of a metal can be determined with the help of Archimedes Principle which makes use of the densities and buoyancy of metals. Finding the density of a metal sample can help to determine its purity. It is most commonly used in the checking the purity of gold.
[9] If both the mass and the velocity of a body is increased to twice of their magnitude, the kinetic energy will increase by –
A.
2 times
B.
4 times
C.
8 times
D.
16 times
Ans:
4 times
Explanation :
0
[10] Which phenomenon is responsible for the echo of sound wave?
A.
Reflection
B.
Refraction
C.
Interference
D.
Polarization
Ans:
Reflection
Explanation :
Reflection of sound waves off of surfaces lead to one of two phenomena - an echo or a reverberation. The echo is produced due to hitting of the sound waves with the obstacles which makes the Sound to reflect back. Echoes occur when a reflected sound wave reaches the ear more than 0.1 seconds after the original sound wave was heard.
[11] Which of the following has the lowest frequency?
A.
Visible light
B.
Gamma rays
C.
Xrays
D.
Ultra violet rays
Ans:
Visible light
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide over current protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[12] A fresh egg when placed in salt water will –
A.
sink and go to the bottom
B.
sink but will not go to the bottom
C.
float
D.
burst
Ans:
float
Explanation :
When a fresh egg is placed in regular water, it sinks. However, when the same egg is placed in saltwater, it floats. This is because salt water is denser than the egg causing it to float.
[13] What is the unit of relative density?
A.
kg/m
B.
kg/m²
C.
kg/m³
D.
It has no unit
Ans:
It has no unit
Explanation :
Relative density is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. So, it is a dimensionless quantity and has no unit.
[14] Hydraulic brakes in automobile work on –
A.
Poiseuille's principle
B.
Pascal's principle
C.
Archimedes' principle
D.
Bernoulli's principle
Ans:
Pascal's principle
Explanation :
The hydraulic brake is an arrangement of braking mechanism which uses brake fluid, typically containing glycol ethers or diethylene glycol, to transfer pressure from the controlling mechanism to the braking mechanism. It works on the principle of Pascal's law which states that "pressure at a point in a fluid is equal in all directions in space". When pressure is applied on a fluid it travels equally in all directions so that uniform braking action is applied on all wheels.
[15] The gas used in a refrigerator is -
A.
cooled down on flowing
B.
heated up on flowing
C.
cooled down when compressed
D.
cooled down when expanded
Ans:
cooled down when expanded
Explanation :
Common refrigerants used in various applications are ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as propane. Compressing these gasses into liquids they are made to give up their heat.
[16] The main purpose of the spacecraft "messenger" is :
A.
Orbiting the Venus
B.
Orbiting the Mars
C.
Mapping and investigating the Mercury
D.
None of the above
Ans:
Mapping and investigating the Mercury
Explanation :
Messenger (stylized as MESSENGER, whose backronym is Mercury Surface, Space Environment, Geochemistry, and Ranging") was spacecraft that orbited the planet Mercury between 2011 and 2015.
[17] Light scattering takes place in –
A.
Colloidal solutions
B.
Acidic solutions
C.
Electrolyte solutions
D.
Basic solutions
Ans:
Colloidal solutions
Explanation :
Light scattering in colloidal solutions or particles in suspension is known as Tyndall Effect. It is similar to Rayleigh scattering, in that the intensity of the scattered light depends on the fourth power of the frequency, so blue light is scattered much more strongly than red light.
[18] The term reactor referred to in waste water treatment is –
A.
Vessel
B.
Settling tank
C.
Clarifier
D.
Aeration tank
Ans:
Aeration tank
Explanation :
Reactors are industrial processing tanks for the treatment of wastewater. The tanks have a "flow through" system, with raw wastewater (influent) coming in at one end and treated water (effluent) flowing out the other. While one tank is in settle/ decant mode the other is aerating and filling.
[19] The dimension MLT⁻² corresponds to –
A.
force
B.
work done
C.
acceleration
D.
velocity
Ans:
force
Explanation :
The dimensions of Force are M (mass), L (length) and T-2 (time). It can also be expressed as [newton] = [kilogram] [metre] [second]-2.
[20] Good conductors have many loosely bound _.
A.
neutrons
B.
protons
C.
positron
D.
electrons
Ans:
electrons
Explanation :
In a conductor, the outer electrons of the atoms are loosely bound and free to move through the material.
[21] Cactus is referred to as -
A.
Hydrophyte
B.
Mesophyte
C.
Xerophyte
D.
Epiphyte
Ans:
Xerophyte
Explanation :
Cactus is a xerophyte as it specializes in surviving in hot and dry environments. Xerophytes are plants that are adapted to survive in an environment with little water, such as a desert or an ice- or snowcovered region in the Alps or the Arctic.
[22] Which, of the following radiations has the least wavelength?
A.
X-rays
B.
a-rays
C.
g-rays
D.
b-rays
Ans:
g-rays
Explanation :
X-rays - smaller than 10 nano metre gamma- rays - 0.0005 to 0.1 nano metre alpha-rays - 125 nano metre
[23] What is the physical state of water at 12° C?
A.
Gas
B.
Solid
C.
Liquid
D.
Ionic
Ans:
Liquid
Explanation :
Water can occur in thretates solid (ice), liquid gas (vapor). It is liquid at 12 Celsius. This i s the form water with which we are most familiar.
[24] Change in quality of environment that can be harmful and unpleasant for living things is called –
A.
Energy
B.
Pollution
C.
Revolution
D.
Transformation
Ans:
Pollution
Explanation :
A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource.
[25] Which among the following lens is used to correct Presbyopia?
A.
Concave
B.
Convex
C.
Cylindrical
D.
Bifocal
Ans:
Bifocal
Explanation :
In Presbyopia defect both near and far object are not clearly visible i.e., far point is lesser than infinity and near point greater than 25 cm. This can be removed either by using two separate spectacles one for myopia and other for hypermetropia or by using bifocal lens. It is an old age disease. At old age ciliary muscles lose their elasticity so they can not change the focal length of eye lens effectively and eye losses its power of accommodation
Explanation :
ML⁻¹T⁻² is the dimension of any quantity that is force per unit area such as Pressure or Stress, Young's Modulus, Bulk Modulus, Modulus of Rigidity, Energy Density. The Modulus of Elasticity is the ratio of the stress applied to a body or substance to the resulting strain within the elastic limit.
[8] Purity of a metal can be determined with the help of –
A.
Pascal's law
B.
Boyle's law
C.
Archimedes principle
D.
Conservation of mass principle
Ans:
Archimedes principle
Explanation :
Purity of a metal can be determined with the help of Archimedes Principle which makes use of the densities and buoyancy of metals. Finding the density of a metal sample can help to determine its purity. It is most commonly used in the checking the purity of gold.
[9] If both the mass and the velocity of a body is increased to twice of their magnitude, the kinetic energy will increase by –
A.
2 times
B.
4 times
C.
8 times
D.
16 times
Ans:
4 times
Explanation :
0
[10] Which phenomenon is responsible for the echo of sound wave?
A.
Reflection
B.
Refraction
C.
Interference
D.
Polarization
Ans:
Reflection
Explanation :
Reflection of sound waves off of surfaces lead to one of two phenomena - an echo or a reverberation. The echo is produced due to hitting of the sound waves with the obstacles which makes the Sound to reflect back. Echoes occur when a reflected sound wave reaches the ear more than 0.1 seconds after the original sound wave was heard.
[11] Which of the following has the lowest frequency?
A.
Visible light
B.
Gamma rays
C.
Xrays
D.
Ultra violet rays
Ans:
Visible light
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide over current protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[12] A fresh egg when placed in salt water will –
A.
sink and go to the bottom
B.
sink but will not go to the bottom
C.
float
D.
burst
Ans:
float
Explanation :
When a fresh egg is placed in regular water, it sinks. However, when the same egg is placed in saltwater, it floats. This is because salt water is denser than the egg causing it to float.
[13] What is the unit of relative density?
A.
kg/m
B.
kg/m²
C.
kg/m³
D.
It has no unit
Ans:
It has no unit
Explanation :
Relative density is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. So, it is a dimensionless quantity and has no unit.
[14] Hydraulic brakes in automobile work on –
A.
Poiseuille's principle
B.
Pascal's principle
C.
Archimedes' principle
D.
Bernoulli's principle
Ans:
Pascal's principle
Explanation :
The hydraulic brake is an arrangement of braking mechanism which uses brake fluid, typically containing glycol ethers or diethylene glycol, to transfer pressure from the controlling mechanism to the braking mechanism. It works on the principle of Pascal's law which states that "pressure at a point in a fluid is equal in all directions in space". When pressure is applied on a fluid it travels equally in all directions so that uniform braking action is applied on all wheels.
[15] The gas used in a refrigerator is -
A.
cooled down on flowing
B.
heated up on flowing
C.
cooled down when compressed
D.
cooled down when expanded
Ans:
cooled down when expanded
Explanation :
Common refrigerants used in various applications are ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as propane. Compressing these gasses into liquids they are made to give up their heat.
[16] The main purpose of the spacecraft "messenger" is :
A.
Orbiting the Venus
B.
Orbiting the Mars
C.
Mapping and investigating the Mercury
D.
None of the above
Ans:
Mapping and investigating the Mercury
Explanation :
Messenger (stylized as MESSENGER, whose backronym is Mercury Surface, Space Environment, Geochemistry, and Ranging") was spacecraft that orbited the planet Mercury between 2011 and 2015.
[17] Light scattering takes place in –
A.
Colloidal solutions
B.
Acidic solutions
C.
Electrolyte solutions
D.
Basic solutions
Ans:
Colloidal solutions
Explanation :
Light scattering in colloidal solutions or particles in suspension is known as Tyndall Effect. It is similar to Rayleigh scattering, in that the intensity of the scattered light depends on the fourth power of the frequency, so blue light is scattered much more strongly than red light.
[18] The term reactor referred to in waste water treatment is –
A.
Vessel
B.
Settling tank
C.
Clarifier
D.
Aeration tank
Ans:
Aeration tank
Explanation :
Reactors are industrial processing tanks for the treatment of wastewater. The tanks have a "flow through" system, with raw wastewater (influent) coming in at one end and treated water (effluent) flowing out the other. While one tank is in settle/ decant mode the other is aerating and filling.
[19] The dimension MLT⁻² corresponds to –
A.
force
B.
work done
C.
acceleration
D.
velocity
Ans:
force
Explanation :
The dimensions of Force are M (mass), L (length) and T-2 (time). It can also be expressed as [newton] = [kilogram] [metre] [second]-2.
[20] Good conductors have many loosely bound _.
A.
neutrons
B.
protons
C.
positron
D.
electrons
Ans:
electrons
Explanation :
In a conductor, the outer electrons of the atoms are loosely bound and free to move through the material.
[21] Cactus is referred to as -
A.
Hydrophyte
B.
Mesophyte
C.
Xerophyte
D.
Epiphyte
Ans:
Xerophyte
Explanation :
Cactus is a xerophyte as it specializes in surviving in hot and dry environments. Xerophytes are plants that are adapted to survive in an environment with little water, such as a desert or an ice- or snowcovered region in the Alps or the Arctic.
[22] Which, of the following radiations has the least wavelength?
A.
X-rays
B.
a-rays
C.
g-rays
D.
b-rays
Ans:
g-rays
Explanation :
X-rays - smaller than 10 nano metre gamma- rays - 0.0005 to 0.1 nano metre alpha-rays - 125 nano metre
[23] What is the physical state of water at 12° C?
A.
Gas
B.
Solid
C.
Liquid
D.
Ionic
Ans:
Liquid
Explanation :
Water can occur in thretates solid (ice), liquid gas (vapor). It is liquid at 12 Celsius. This i s the form water with which we are most familiar.
[24] Change in quality of environment that can be harmful and unpleasant for living things is called –
A.
Energy
B.
Pollution
C.
Revolution
D.
Transformation
Ans:
Pollution
Explanation :
A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource.
[25] Which among the following lens is used to correct Presbyopia?
A.
Concave
B.
Convex
C.
Cylindrical
D.
Bifocal
Ans:
Bifocal
Explanation :
In Presbyopia defect both near and far object are not clearly visible i.e., far point is lesser than infinity and near point greater than 25 cm. This can be removed either by using two separate spectacles one for myopia and other for hypermetropia or by using bifocal lens. It is an old age disease. At old age ciliary muscles lose their elasticity so they can not change the focal length of eye lens effectively and eye losses its power of accommodation
Explanation :
0
[10] Which phenomenon is responsible for the echo of sound wave?
A.
Reflection
B.
Refraction
C.
Interference
D.
Polarization
Ans:
Reflection
Explanation :
Reflection of sound waves off of surfaces lead to one of two phenomena - an echo or a reverberation. The echo is produced due to hitting of the sound waves with the obstacles which makes the Sound to reflect back. Echoes occur when a reflected sound wave reaches the ear more than 0.1 seconds after the original sound wave was heard.
[11] Which of the following has the lowest frequency?
A.
Visible light
B.
Gamma rays
C.
Xrays
D.
Ultra violet rays
Ans:
Visible light
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide over current protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[12] A fresh egg when placed in salt water will –
A.
sink and go to the bottom
B.
sink but will not go to the bottom
C.
float
D.
burst
Ans:
float
Explanation :
When a fresh egg is placed in regular water, it sinks. However, when the same egg is placed in saltwater, it floats. This is because salt water is denser than the egg causing it to float.
[13] What is the unit of relative density?
A.
kg/m
B.
kg/m²
C.
kg/m³
D.
It has no unit
Ans:
It has no unit
Explanation :
Relative density is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. So, it is a dimensionless quantity and has no unit.
[14] Hydraulic brakes in automobile work on –
A.
Poiseuille's principle
B.
Pascal's principle
C.
Archimedes' principle
D.
Bernoulli's principle
Ans:
Pascal's principle
Explanation :
The hydraulic brake is an arrangement of braking mechanism which uses brake fluid, typically containing glycol ethers or diethylene glycol, to transfer pressure from the controlling mechanism to the braking mechanism. It works on the principle of Pascal's law which states that "pressure at a point in a fluid is equal in all directions in space". When pressure is applied on a fluid it travels equally in all directions so that uniform braking action is applied on all wheels.
[15] The gas used in a refrigerator is -
A.
cooled down on flowing
B.
heated up on flowing
C.
cooled down when compressed
D.
cooled down when expanded
Ans:
cooled down when expanded
Explanation :
Common refrigerants used in various applications are ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as propane. Compressing these gasses into liquids they are made to give up their heat.
[16] The main purpose of the spacecraft "messenger" is :
A.
Orbiting the Venus
B.
Orbiting the Mars
C.
Mapping and investigating the Mercury
D.
None of the above
Ans:
Mapping and investigating the Mercury
Explanation :
Messenger (stylized as MESSENGER, whose backronym is Mercury Surface, Space Environment, Geochemistry, and Ranging") was spacecraft that orbited the planet Mercury between 2011 and 2015.
[17] Light scattering takes place in –
A.
Colloidal solutions
B.
Acidic solutions
C.
Electrolyte solutions
D.
Basic solutions
Ans:
Colloidal solutions
Explanation :
Light scattering in colloidal solutions or particles in suspension is known as Tyndall Effect. It is similar to Rayleigh scattering, in that the intensity of the scattered light depends on the fourth power of the frequency, so blue light is scattered much more strongly than red light.
[18] The term reactor referred to in waste water treatment is –
A.
Vessel
B.
Settling tank
C.
Clarifier
D.
Aeration tank
Ans:
Aeration tank
Explanation :
Reactors are industrial processing tanks for the treatment of wastewater. The tanks have a "flow through" system, with raw wastewater (influent) coming in at one end and treated water (effluent) flowing out the other. While one tank is in settle/ decant mode the other is aerating and filling.
[19] The dimension MLT⁻² corresponds to –
A.
force
B.
work done
C.
acceleration
D.
velocity
Ans:
force
Explanation :
The dimensions of Force are M (mass), L (length) and T-2 (time). It can also be expressed as [newton] = [kilogram] [metre] [second]-2.
[20] Good conductors have many loosely bound _.
A.
neutrons
B.
protons
C.
positron
D.
electrons
Ans:
electrons
Explanation :
In a conductor, the outer electrons of the atoms are loosely bound and free to move through the material.
[21] Cactus is referred to as -
A.
Hydrophyte
B.
Mesophyte
C.
Xerophyte
D.
Epiphyte
Ans:
Xerophyte
Explanation :
Cactus is a xerophyte as it specializes in surviving in hot and dry environments. Xerophytes are plants that are adapted to survive in an environment with little water, such as a desert or an ice- or snowcovered region in the Alps or the Arctic.
[22] Which, of the following radiations has the least wavelength?
A.
X-rays
B.
a-rays
C.
g-rays
D.
b-rays
Ans:
g-rays
Explanation :
X-rays - smaller than 10 nano metre gamma- rays - 0.0005 to 0.1 nano metre alpha-rays - 125 nano metre
[23] What is the physical state of water at 12° C?
A.
Gas
B.
Solid
C.
Liquid
D.
Ionic
Ans:
Liquid
Explanation :
Water can occur in thretates solid (ice), liquid gas (vapor). It is liquid at 12 Celsius. This i s the form water with which we are most familiar.
[24] Change in quality of environment that can be harmful and unpleasant for living things is called –
A.
Energy
B.
Pollution
C.
Revolution
D.
Transformation
Ans:
Pollution
Explanation :
A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource.
[25] Which among the following lens is used to correct Presbyopia?
A.
Concave
B.
Convex
C.
Cylindrical
D.
Bifocal
Ans:
Bifocal
Explanation :
In Presbyopia defect both near and far object are not clearly visible i.e., far point is lesser than infinity and near point greater than 25 cm. This can be removed either by using two separate spectacles one for myopia and other for hypermetropia or by using bifocal lens. It is an old age disease. At old age ciliary muscles lose their elasticity so they can not change the focal length of eye lens effectively and eye losses its power of accommodation
Explanation :
The common material used as fuse wire is an alloy of tin and lead (63% tin and 37% lead). Fuse wires provide over current protection of an electrical circuit including the source of power and the load. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the flow of current.
[12] A fresh egg when placed in salt water will –
A.
sink and go to the bottom
B.
sink but will not go to the bottom
C.
float
D.
burst
Ans:
float
Explanation :
When a fresh egg is placed in regular water, it sinks. However, when the same egg is placed in saltwater, it floats. This is because salt water is denser than the egg causing it to float.
[13] What is the unit of relative density?
A.
kg/m
B.
kg/m²
C.
kg/m³
D.
It has no unit
Ans:
It has no unit
Explanation :
Relative density is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. So, it is a dimensionless quantity and has no unit.
[14] Hydraulic brakes in automobile work on –
A.
Poiseuille's principle
B.
Pascal's principle
C.
Archimedes' principle
D.
Bernoulli's principle
Ans:
Pascal's principle
Explanation :
The hydraulic brake is an arrangement of braking mechanism which uses brake fluid, typically containing glycol ethers or diethylene glycol, to transfer pressure from the controlling mechanism to the braking mechanism. It works on the principle of Pascal's law which states that "pressure at a point in a fluid is equal in all directions in space". When pressure is applied on a fluid it travels equally in all directions so that uniform braking action is applied on all wheels.
[15] The gas used in a refrigerator is -
A.
cooled down on flowing
B.
heated up on flowing
C.
cooled down when compressed
D.
cooled down when expanded
Ans:
cooled down when expanded
Explanation :
Common refrigerants used in various applications are ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as propane. Compressing these gasses into liquids they are made to give up their heat.
[16] The main purpose of the spacecraft "messenger" is :
A.
Orbiting the Venus
B.
Orbiting the Mars
C.
Mapping and investigating the Mercury
D.
None of the above
Ans:
Mapping and investigating the Mercury
Explanation :
Messenger (stylized as MESSENGER, whose backronym is Mercury Surface, Space Environment, Geochemistry, and Ranging") was spacecraft that orbited the planet Mercury between 2011 and 2015.
[17] Light scattering takes place in –
A.
Colloidal solutions
B.
Acidic solutions
C.
Electrolyte solutions
D.
Basic solutions
Ans:
Colloidal solutions
Explanation :
Light scattering in colloidal solutions or particles in suspension is known as Tyndall Effect. It is similar to Rayleigh scattering, in that the intensity of the scattered light depends on the fourth power of the frequency, so blue light is scattered much more strongly than red light.
[18] The term reactor referred to in waste water treatment is –
A.
Vessel
B.
Settling tank
C.
Clarifier
D.
Aeration tank
Ans:
Aeration tank
Explanation :
Reactors are industrial processing tanks for the treatment of wastewater. The tanks have a "flow through" system, with raw wastewater (influent) coming in at one end and treated water (effluent) flowing out the other. While one tank is in settle/ decant mode the other is aerating and filling.
[19] The dimension MLT⁻² corresponds to –
A.
force
B.
work done
C.
acceleration
D.
velocity
Ans:
force
Explanation :
The dimensions of Force are M (mass), L (length) and T-2 (time). It can also be expressed as [newton] = [kilogram] [metre] [second]-2.
[20] Good conductors have many loosely bound _.
A.
neutrons
B.
protons
C.
positron
D.
electrons
Ans:
electrons
Explanation :
In a conductor, the outer electrons of the atoms are loosely bound and free to move through the material.
[21] Cactus is referred to as -
A.
Hydrophyte
B.
Mesophyte
C.
Xerophyte
D.
Epiphyte
Ans:
Xerophyte
Explanation :
Cactus is a xerophyte as it specializes in surviving in hot and dry environments. Xerophytes are plants that are adapted to survive in an environment with little water, such as a desert or an ice- or snowcovered region in the Alps or the Arctic.
[22] Which, of the following radiations has the least wavelength?
A.
X-rays
B.
a-rays
C.
g-rays
D.
b-rays
Ans:
g-rays
Explanation :
X-rays - smaller than 10 nano metre gamma- rays - 0.0005 to 0.1 nano metre alpha-rays - 125 nano metre
[23] What is the physical state of water at 12° C?
A.
Gas
B.
Solid
C.
Liquid
D.
Ionic
Ans:
Liquid
Explanation :
Water can occur in thretates solid (ice), liquid gas (vapor). It is liquid at 12 Celsius. This i s the form water with which we are most familiar.
[24] Change in quality of environment that can be harmful and unpleasant for living things is called –
A.
Energy
B.
Pollution
C.
Revolution
D.
Transformation
Ans:
Pollution
Explanation :
A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource.
[25] Which among the following lens is used to correct Presbyopia?
A.
Concave
B.
Convex
C.
Cylindrical
D.
Bifocal
Ans:
Bifocal
Explanation :
In Presbyopia defect both near and far object are not clearly visible i.e., far point is lesser than infinity and near point greater than 25 cm. This can be removed either by using two separate spectacles one for myopia and other for hypermetropia or by using bifocal lens. It is an old age disease. At old age ciliary muscles lose their elasticity so they can not change the focal length of eye lens effectively and eye losses its power of accommodation
Explanation :
Relative density is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. So, it is a dimensionless quantity and has no unit.
[14] Hydraulic brakes in automobile work on –
A.
Poiseuille's principle
B.
Pascal's principle
C.
Archimedes' principle
D.
Bernoulli's principle
Ans:
Pascal's principle
Explanation :
The hydraulic brake is an arrangement of braking mechanism which uses brake fluid, typically containing glycol ethers or diethylene glycol, to transfer pressure from the controlling mechanism to the braking mechanism. It works on the principle of Pascal's law which states that "pressure at a point in a fluid is equal in all directions in space". When pressure is applied on a fluid it travels equally in all directions so that uniform braking action is applied on all wheels.
[15] The gas used in a refrigerator is -
A.
cooled down on flowing
B.
heated up on flowing
C.
cooled down when compressed
D.
cooled down when expanded
Ans:
cooled down when expanded
Explanation :
Common refrigerants used in various applications are ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as propane. Compressing these gasses into liquids they are made to give up their heat.
[16] The main purpose of the spacecraft "messenger" is :
A.
Orbiting the Venus
B.
Orbiting the Mars
C.
Mapping and investigating the Mercury
D.
None of the above
Ans:
Mapping and investigating the Mercury
Explanation :
Messenger (stylized as MESSENGER, whose backronym is Mercury Surface, Space Environment, Geochemistry, and Ranging") was spacecraft that orbited the planet Mercury between 2011 and 2015.
[17] Light scattering takes place in –
A.
Colloidal solutions
B.
Acidic solutions
C.
Electrolyte solutions
D.
Basic solutions
Ans:
Colloidal solutions
Explanation :
Light scattering in colloidal solutions or particles in suspension is known as Tyndall Effect. It is similar to Rayleigh scattering, in that the intensity of the scattered light depends on the fourth power of the frequency, so blue light is scattered much more strongly than red light.
[18] The term reactor referred to in waste water treatment is –
A.
Vessel
B.
Settling tank
C.
Clarifier
D.
Aeration tank
Ans:
Aeration tank
Explanation :
Reactors are industrial processing tanks for the treatment of wastewater. The tanks have a "flow through" system, with raw wastewater (influent) coming in at one end and treated water (effluent) flowing out the other. While one tank is in settle/ decant mode the other is aerating and filling.
[19] The dimension MLT⁻² corresponds to –
A.
force
B.
work done
C.
acceleration
D.
velocity
Ans:
force
Explanation :
The dimensions of Force are M (mass), L (length) and T-2 (time). It can also be expressed as [newton] = [kilogram] [metre] [second]-2.
[20] Good conductors have many loosely bound _.
A.
neutrons
B.
protons
C.
positron
D.
electrons
Ans:
electrons
Explanation :
In a conductor, the outer electrons of the atoms are loosely bound and free to move through the material.
[21] Cactus is referred to as -
A.
Hydrophyte
B.
Mesophyte
C.
Xerophyte
D.
Epiphyte
Ans:
Xerophyte
Explanation :
Cactus is a xerophyte as it specializes in surviving in hot and dry environments. Xerophytes are plants that are adapted to survive in an environment with little water, such as a desert or an ice- or snowcovered region in the Alps or the Arctic.
[22] Which, of the following radiations has the least wavelength?
A.
X-rays
B.
a-rays
C.
g-rays
D.
b-rays
Ans:
g-rays
Explanation :
X-rays - smaller than 10 nano metre gamma- rays - 0.0005 to 0.1 nano metre alpha-rays - 125 nano metre
[23] What is the physical state of water at 12° C?
A.
Gas
B.
Solid
C.
Liquid
D.
Ionic
Ans:
Liquid
Explanation :
Water can occur in thretates solid (ice), liquid gas (vapor). It is liquid at 12 Celsius. This i s the form water with which we are most familiar.
[24] Change in quality of environment that can be harmful and unpleasant for living things is called –
A.
Energy
B.
Pollution
C.
Revolution
D.
Transformation
Ans:
Pollution
Explanation :
A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource.
[25] Which among the following lens is used to correct Presbyopia?
A.
Concave
B.
Convex
C.
Cylindrical
D.
Bifocal
Ans:
Bifocal
Explanation :
In Presbyopia defect both near and far object are not clearly visible i.e., far point is lesser than infinity and near point greater than 25 cm. This can be removed either by using two separate spectacles one for myopia and other for hypermetropia or by using bifocal lens. It is an old age disease. At old age ciliary muscles lose their elasticity so they can not change the focal length of eye lens effectively and eye losses its power of accommodation
Explanation :
Common refrigerants used in various applications are ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as propane. Compressing these gasses into liquids they are made to give up their heat.
[16] The main purpose of the spacecraft "messenger" is :
A.
Orbiting the Venus
B.
Orbiting the Mars
C.
Mapping and investigating the Mercury
D.
None of the above
Ans:
Mapping and investigating the Mercury
Explanation :
Messenger (stylized as MESSENGER, whose backronym is Mercury Surface, Space Environment, Geochemistry, and Ranging") was spacecraft that orbited the planet Mercury between 2011 and 2015.
[17] Light scattering takes place in –
A.
Colloidal solutions
B.
Acidic solutions
C.
Electrolyte solutions
D.
Basic solutions
Ans:
Colloidal solutions
Explanation :
Light scattering in colloidal solutions or particles in suspension is known as Tyndall Effect. It is similar to Rayleigh scattering, in that the intensity of the scattered light depends on the fourth power of the frequency, so blue light is scattered much more strongly than red light.
[18] The term reactor referred to in waste water treatment is –
A.
Vessel
B.
Settling tank
C.
Clarifier
D.
Aeration tank
Ans:
Aeration tank
Explanation :
Reactors are industrial processing tanks for the treatment of wastewater. The tanks have a "flow through" system, with raw wastewater (influent) coming in at one end and treated water (effluent) flowing out the other. While one tank is in settle/ decant mode the other is aerating and filling.
[19] The dimension MLT⁻² corresponds to –
A.
force
B.
work done
C.
acceleration
D.
velocity
Ans:
force
Explanation :
The dimensions of Force are M (mass), L (length) and T-2 (time). It can also be expressed as [newton] = [kilogram] [metre] [second]-2.
[20] Good conductors have many loosely bound _.
A.
neutrons
B.
protons
C.
positron
D.
electrons
Ans:
electrons
Explanation :
In a conductor, the outer electrons of the atoms are loosely bound and free to move through the material.
[21] Cactus is referred to as -
A.
Hydrophyte
B.
Mesophyte
C.
Xerophyte
D.
Epiphyte
Ans:
Xerophyte
Explanation :
Cactus is a xerophyte as it specializes in surviving in hot and dry environments. Xerophytes are plants that are adapted to survive in an environment with little water, such as a desert or an ice- or snowcovered region in the Alps or the Arctic.
[22] Which, of the following radiations has the least wavelength?
A.
X-rays
B.
a-rays
C.
g-rays
D.
b-rays
Ans:
g-rays
Explanation :
X-rays - smaller than 10 nano metre gamma- rays - 0.0005 to 0.1 nano metre alpha-rays - 125 nano metre
[23] What is the physical state of water at 12° C?
A.
Gas
B.
Solid
C.
Liquid
D.
Ionic
Ans:
Liquid
Explanation :
Water can occur in thretates solid (ice), liquid gas (vapor). It is liquid at 12 Celsius. This i s the form water with which we are most familiar.
[24] Change in quality of environment that can be harmful and unpleasant for living things is called –
A.
Energy
B.
Pollution
C.
Revolution
D.
Transformation
Ans:
Pollution
Explanation :
A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource.
[25] Which among the following lens is used to correct Presbyopia?
A.
Concave
B.
Convex
C.
Cylindrical
D.
Bifocal
Ans:
Bifocal
Explanation :
In Presbyopia defect both near and far object are not clearly visible i.e., far point is lesser than infinity and near point greater than 25 cm. This can be removed either by using two separate spectacles one for myopia and other for hypermetropia or by using bifocal lens. It is an old age disease. At old age ciliary muscles lose their elasticity so they can not change the focal length of eye lens effectively and eye losses its power of accommodation
Explanation :
Light scattering in colloidal solutions or particles in suspension is known as Tyndall Effect. It is similar to Rayleigh scattering, in that the intensity of the scattered light depends on the fourth power of the frequency, so blue light is scattered much more strongly than red light.
[18] The term reactor referred to in waste water treatment is –
A.
Vessel
B.
Settling tank
C.
Clarifier
D.
Aeration tank
Ans:
Aeration tank
Explanation :
Reactors are industrial processing tanks for the treatment of wastewater. The tanks have a "flow through" system, with raw wastewater (influent) coming in at one end and treated water (effluent) flowing out the other. While one tank is in settle/ decant mode the other is aerating and filling.
[19] The dimension MLT⁻² corresponds to –
A.
force
B.
work done
C.
acceleration
D.
velocity
Ans:
force
Explanation :
The dimensions of Force are M (mass), L (length) and T-2 (time). It can also be expressed as [newton] = [kilogram] [metre] [second]-2.
[20] Good conductors have many loosely bound _.
A.
neutrons
B.
protons
C.
positron
D.
electrons
Ans:
electrons
Explanation :
In a conductor, the outer electrons of the atoms are loosely bound and free to move through the material.
[21] Cactus is referred to as -
A.
Hydrophyte
B.
Mesophyte
C.
Xerophyte
D.
Epiphyte
Ans:
Xerophyte
Explanation :
Cactus is a xerophyte as it specializes in surviving in hot and dry environments. Xerophytes are plants that are adapted to survive in an environment with little water, such as a desert or an ice- or snowcovered region in the Alps or the Arctic.
[22] Which, of the following radiations has the least wavelength?
A.
X-rays
B.
a-rays
C.
g-rays
D.
b-rays
Ans:
g-rays
Explanation :
X-rays - smaller than 10 nano metre gamma- rays - 0.0005 to 0.1 nano metre alpha-rays - 125 nano metre
[23] What is the physical state of water at 12° C?
A.
Gas
B.
Solid
C.
Liquid
D.
Ionic
Ans:
Liquid
Explanation :
Water can occur in thretates solid (ice), liquid gas (vapor). It is liquid at 12 Celsius. This i s the form water with which we are most familiar.
[24] Change in quality of environment that can be harmful and unpleasant for living things is called –
A.
Energy
B.
Pollution
C.
Revolution
D.
Transformation
Ans:
Pollution
Explanation :
A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource.
[25] Which among the following lens is used to correct Presbyopia?
A.
Concave
B.
Convex
C.
Cylindrical
D.
Bifocal
Ans:
Bifocal
Explanation :
In Presbyopia defect both near and far object are not clearly visible i.e., far point is lesser than infinity and near point greater than 25 cm. This can be removed either by using two separate spectacles one for myopia and other for hypermetropia or by using bifocal lens. It is an old age disease. At old age ciliary muscles lose their elasticity so they can not change the focal length of eye lens effectively and eye losses its power of accommodation
Explanation :
The dimensions of Force are M (mass), L (length) and T-2 (time). It can also be expressed as [newton] = [kilogram] [metre] [second]-2.
[20] Good conductors have many loosely bound _.
A.
neutrons
B.
protons
C.
positron
D.
electrons
Ans:
electrons
Explanation :
In a conductor, the outer electrons of the atoms are loosely bound and free to move through the material.
[21] Cactus is referred to as -
A.
Hydrophyte
B.
Mesophyte
C.
Xerophyte
D.
Epiphyte
Ans:
Xerophyte
Explanation :
Cactus is a xerophyte as it specializes in surviving in hot and dry environments. Xerophytes are plants that are adapted to survive in an environment with little water, such as a desert or an ice- or snowcovered region in the Alps or the Arctic.
[22] Which, of the following radiations has the least wavelength?
A.
X-rays
B.
a-rays
C.
g-rays
D.
b-rays
Ans:
g-rays
Explanation :
X-rays - smaller than 10 nano metre gamma- rays - 0.0005 to 0.1 nano metre alpha-rays - 125 nano metre
[23] What is the physical state of water at 12° C?
A.
Gas
B.
Solid
C.
Liquid
D.
Ionic
Ans:
Liquid
Explanation :
Water can occur in thretates solid (ice), liquid gas (vapor). It is liquid at 12 Celsius. This i s the form water with which we are most familiar.
[24] Change in quality of environment that can be harmful and unpleasant for living things is called –
A.
Energy
B.
Pollution
C.
Revolution
D.
Transformation
Ans:
Pollution
Explanation :
A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource.
[25] Which among the following lens is used to correct Presbyopia?
A.
Concave
B.
Convex
C.
Cylindrical
D.
Bifocal
Ans:
Bifocal
Explanation :
In Presbyopia defect both near and far object are not clearly visible i.e., far point is lesser than infinity and near point greater than 25 cm. This can be removed either by using two separate spectacles one for myopia and other for hypermetropia or by using bifocal lens. It is an old age disease. At old age ciliary muscles lose their elasticity so they can not change the focal length of eye lens effectively and eye losses its power of accommodation
Explanation :
Cactus is a xerophyte as it specializes in surviving in hot and dry environments. Xerophytes are plants that are adapted to survive in an environment with little water, such as a desert or an ice- or snowcovered region in the Alps or the Arctic.
[22] Which, of the following radiations has the least wavelength?
A.
X-rays
B.
a-rays
C.
g-rays
D.
b-rays
Ans:
g-rays
Explanation :
X-rays - smaller than 10 nano metre gamma- rays - 0.0005 to 0.1 nano metre alpha-rays - 125 nano metre
[23] What is the physical state of water at 12° C?
A.
Gas
B.
Solid
C.
Liquid
D.
Ionic
Ans:
Liquid
Explanation :
Water can occur in thretates solid (ice), liquid gas (vapor). It is liquid at 12 Celsius. This i s the form water with which we are most familiar.
[24] Change in quality of environment that can be harmful and unpleasant for living things is called –
A.
Energy
B.
Pollution
C.
Revolution
D.
Transformation
Ans:
Pollution
Explanation :
A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource.
[25] Which among the following lens is used to correct Presbyopia?
A.
Concave
B.
Convex
C.
Cylindrical
D.
Bifocal
Ans:
Bifocal
Explanation :
In Presbyopia defect both near and far object are not clearly visible i.e., far point is lesser than infinity and near point greater than 25 cm. This can be removed either by using two separate spectacles one for myopia and other for hypermetropia or by using bifocal lens. It is an old age disease. At old age ciliary muscles lose their elasticity so they can not change the focal length of eye lens effectively and eye losses its power of accommodation
Explanation :
Water can occur in thretates solid (ice), liquid gas (vapor). It is liquid at 12 Celsius. This i s the form water with which we are most familiar.
[24] Change in quality of environment that can be harmful and unpleasant for living things is called –
A.
Energy
B.
Pollution
C.
Revolution
D.
Transformation
Ans:
Pollution
Explanation :
A pollutant is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource.
[25] Which among the following lens is used to correct Presbyopia?
A.
Concave
B.
Convex
C.
Cylindrical
D.
Bifocal
Ans:
Bifocal
Explanation :
In Presbyopia defect both near and far object are not clearly visible i.e., far point is lesser than infinity and near point greater than 25 cm. This can be removed either by using two separate spectacles one for myopia and other for hypermetropia or by using bifocal lens. It is an old age disease. At old age ciliary muscles lose their elasticity so they can not change the focal length of eye lens effectively and eye losses its power of accommodation
Explanation :
In Presbyopia defect both near and far object are not clearly visible i.e., far point is lesser than infinity and near point greater than 25 cm. This can be removed either by using two separate spectacles one for myopia and other for hypermetropia or by using bifocal lens. It is an old age disease. At old age ciliary muscles lose their elasticity so they can not change the focal length of eye lens effectively and eye losses its power of accommodation