[1] Which one of the following non-metals is not a poor conductor of electricity?
A.
Sulphur
B.
Selenium
C.
Bromine
D.
Phosphorus
Ans:
Selenium
Explanation :
Selenium is a non-metallic element; it is not a very good conductor of heat and electricity.
[2] Which instrument is used to record Atmospheric pressure?
A.
Thermometer
B.
Barometer
C.
Seismometer
D.
Oscilloscope
Ans:
Barometer
Explanation :
A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. A barometer using mercury is common. This is often recorded as mm Hg.
[3] Full form of CFL used in place of electric bulbs is –
A.
compact fluorescent lamp
B.
constantan filament lamp
C.
closed filament lamp
D.
closed fluorescent lamp
Ans:
compact fluorescent lamp
Explanation :
A compact fluorescent lamp (CFL) is a fluorescent lamp designed to replace an incandescent lamp; some types fit into light fixtures formerly used for incandescent lamps.
[4] A light year is a unit of –
A.
time
B.
distance
C.
speed of light
D.
intensity of light
Ans:
distance
Explanation :
As defined by the International. Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year. It is a measure of distance (rather than, as is sometimes misunderstood, a measure of time).
[5] An instrument that records earth-quakes is –
A.
Ergograph
B.
Ediograph
C.
Thermograph
D.
Seismograph
Ans:
Seismograph
Explanation :
Earthquakes generate seismic waves which can be detected with a sensitive instrument called a seismograph. The earliest seismograph was invented in China A.D. 136 by a man named Choko.
[6] An object is in static equilibrium when it is .
A.
at rest
B.
moving in a circular path
C.
moving with uniform velocity
D.
accelerating at high speed
Ans:
at rest
Explanation :
0
[7] The study of phenomena at very low temperatures is called -
A.
heat transfer
B.
morphology
C.
crystallography
D.
cryogenics
Ans:
cryogenics
Explanation :
A person who studies elements that have been subjected to extremely cold temperatures is called a cryogenicist.
[8] Steel is more elastic than rubber because it –
A.
requires larger deforming force
B.
Is never deformed
C.
is deformed very easily
D.
is harder than rubber
Ans:
is deformed very easily
Explanation :
Elasticity is the capability of an object to return to its former shape once a load inducing strain is removed. Young Modulus or elastic modulus [tendency to be deformed elastically (i.e., non- permanently) when a force is applied to it] of steel is more than that of rubber.
[9] Which phenomena shows the particle nature of light?
A.
Diffraction
B.
Interference
C.
Photoelectric effect
D.
Polarisation
Ans:
Photoelectric effect
Explanation :
The phenomena such as interference, diffraction, and polarization can only be explained when light is treated as a wave whereas photoelectric effect, line spectra, and the production and scattering of x rays demonstrate the particle nature of light.
[10] In the names Mangifera indica (mango), Solanum tuberosum (potato) and Panthera leo (lion), the terms Mangifera, Solanum and Panthera represent the higher level of?
A.
Taxon
B.
Taxonomic Hierarchy
C.
Specific Epithet
D.
Binomial Nomenclature
Ans:
Taxon
Explanation :
All the three names, indica, tuberosum and leo, represent the specific epithets while the first words Mangifera, Solanum and Panthera are genera and represents another higher level of taxon or category.
[11] Sound waves in air are .
A.
transverse
B.
longitudinal
C.
electromagnetic
D.
polarised
Ans:
longitudinal
Explanation :
Sound can propagate through compressible media such as air, water and solids as longitudinal waves and also as a transverse wave in solids.
[12] The motion of a body that repeats itself after a regular interval of time is –
A.
a periodic motion
B.
a simple harmonic motion
C.
an aperiodic motion
D.
an oscillatory motion
Ans:
a periodic motion
Explanation :
The motion of a body that repeats itself after a regular interval of time is called 'Periodic Motion'. Simple Harmonic Motion is a type of periodic motion where the restoring force is directly proportional to the displacement.
[13] When a strong beam of light is passed through a colloidal solution, the light will –
A.
be scattered
B.
pass unchanged
C.
be absorbed
D.
be reflected
Ans:
be scattered
Explanation :
When a strong beam of light is passed through a colloidal solution, the light will be scattered.
[14] Which one of the following is not allied to Geophysical Sciences?
A.
Hydrology
B.
Meteorology
C.
Palaeontology
D.
Seismology
Ans:
Palaeontology
Explanation :
Palaeontology is the study of fossils and the evolution of life on Earth.
[15] The pitch of sound depends on its –
A.
Frequency
B.
Intensity
C.
Velocity
D.
Amplitude
Ans:
Frequency
Explanation :
Pitch is a perceptual property that allows the ordering of sounds on a frequency-related scale. Pitch may be quantified as a frequency, but pitch is not a purely objective physical property; it is a subjective psycho-acoustical attribute of sound.
[16] The ozone layer protects us from -
A.
Ultra violet rays
B.
Radio waves
C.
Visual radiation
D.
Infrared radiation
Ans:
Ultra violet rays
Explanation :
The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
[17] Entropy of the universe is -
A.
continuously increasing
B.
continuously decreasing
C.
zero
D.
constant
Ans:
continuously increasing
Explanation :
In an irreversible process, entropy always increases, so the change in entropy is positive. The total entropy of the universe is continually increasing.
[18] For which among the following house appliances, magnet is an essential part?
A.
Calling bell
B.
Fan
C.
Washing machine
D.
All of the above
Ans:
All of the above
Explanation :
0
[19] Cylindrical lens is used by a person suffering from -
A.
astigmatism
B.
myopia
C.
hypermetropia
D.
None of these
Ans:
astigmatism
Explanation :
A cylindrical lens is typically used to focus, condense or expand incoming light. A cylindrical lens has one cylindrical surface, causing light to be focused in a single dimension or axis.
[20] Metals are good conductors of electricity because -
A.
they contain free electrons
B.
the atoms are lightly packed
C.
they have high melting point
D.
All of the above
Ans:
they contain free electrons
Explanation :
Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points.
[21] Speed of sound in solids is -
A.
10 times that in gas/ 10
B.
20 times that in gas/ 20
C.
5 times that in gas/ 5
D.
15 times that in gas/ 15
Ans:
15 times that in gas/ 15
Explanation :
Sound travels at 343 m/s in air; it travels at 1,480 m/s in water (4.3 times as fast as in air); and at 5,120 m/s in iron (about 15 times as fast as in air).
[22] To open a door easily, the handle should be fixed –
A.
near the hinges
B.
away from mid-point opposite to hinges
C.
in the middle
D.
None of these
Ans:
None of these
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[23] Dioptere is the unit of –
A.
power of a lens
B.
focal length of a lens
C.
light intensity
D.
sound intensity
Ans:
power of a lens
Explanation :
A dioptre or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length.
[24] Velocity of sound in air does not depend on –
A.
Density of air
B.
Temperature of air
C.
Pressure of air
D.
Humidity of air
Ans:
Pressure of air
Explanation :
Assuming air to be an ideal gas, the speed of sound depends on temperature only. As air temperature increases, so does the speed of sound and vice versa. The speed of sound is completely independent of air pressure because the air pressure and air density are proportional to each other at the same temperature.
[25] Conversion of sound energy into electrical energy is done by –
A.
Solar cell
B.
Gramophone
C.
Microphone
D.
Loudspeaker
Ans:
Microphone
Explanation :
Conversion of sound energy into electrical energy is done by microphone.
Explanation :
Selenium is a non-metallic element; it is not a very good conductor of heat and electricity.
[2] Which instrument is used to record Atmospheric pressure?
A.
Thermometer
B.
Barometer
C.
Seismometer
D.
Oscilloscope
Ans:
Barometer
Explanation :
A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. A barometer using mercury is common. This is often recorded as mm Hg.
[3] Full form of CFL used in place of electric bulbs is –
A.
compact fluorescent lamp
B.
constantan filament lamp
C.
closed filament lamp
D.
closed fluorescent lamp
Ans:
compact fluorescent lamp
Explanation :
A compact fluorescent lamp (CFL) is a fluorescent lamp designed to replace an incandescent lamp; some types fit into light fixtures formerly used for incandescent lamps.
[4] A light year is a unit of –
A.
time
B.
distance
C.
speed of light
D.
intensity of light
Ans:
distance
Explanation :
As defined by the International. Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year. It is a measure of distance (rather than, as is sometimes misunderstood, a measure of time).
[5] An instrument that records earth-quakes is –
A.
Ergograph
B.
Ediograph
C.
Thermograph
D.
Seismograph
Ans:
Seismograph
Explanation :
Earthquakes generate seismic waves which can be detected with a sensitive instrument called a seismograph. The earliest seismograph was invented in China A.D. 136 by a man named Choko.
[6] An object is in static equilibrium when it is .
A.
at rest
B.
moving in a circular path
C.
moving with uniform velocity
D.
accelerating at high speed
Ans:
at rest
Explanation :
0
[7] The study of phenomena at very low temperatures is called -
A.
heat transfer
B.
morphology
C.
crystallography
D.
cryogenics
Ans:
cryogenics
Explanation :
A person who studies elements that have been subjected to extremely cold temperatures is called a cryogenicist.
[8] Steel is more elastic than rubber because it –
A.
requires larger deforming force
B.
Is never deformed
C.
is deformed very easily
D.
is harder than rubber
Ans:
is deformed very easily
Explanation :
Elasticity is the capability of an object to return to its former shape once a load inducing strain is removed. Young Modulus or elastic modulus [tendency to be deformed elastically (i.e., non- permanently) when a force is applied to it] of steel is more than that of rubber.
[9] Which phenomena shows the particle nature of light?
A.
Diffraction
B.
Interference
C.
Photoelectric effect
D.
Polarisation
Ans:
Photoelectric effect
Explanation :
The phenomena such as interference, diffraction, and polarization can only be explained when light is treated as a wave whereas photoelectric effect, line spectra, and the production and scattering of x rays demonstrate the particle nature of light.
[10] In the names Mangifera indica (mango), Solanum tuberosum (potato) and Panthera leo (lion), the terms Mangifera, Solanum and Panthera represent the higher level of?
A.
Taxon
B.
Taxonomic Hierarchy
C.
Specific Epithet
D.
Binomial Nomenclature
Ans:
Taxon
Explanation :
All the three names, indica, tuberosum and leo, represent the specific epithets while the first words Mangifera, Solanum and Panthera are genera and represents another higher level of taxon or category.
[11] Sound waves in air are .
A.
transverse
B.
longitudinal
C.
electromagnetic
D.
polarised
Ans:
longitudinal
Explanation :
Sound can propagate through compressible media such as air, water and solids as longitudinal waves and also as a transverse wave in solids.
[12] The motion of a body that repeats itself after a regular interval of time is –
A.
a periodic motion
B.
a simple harmonic motion
C.
an aperiodic motion
D.
an oscillatory motion
Ans:
a periodic motion
Explanation :
The motion of a body that repeats itself after a regular interval of time is called 'Periodic Motion'. Simple Harmonic Motion is a type of periodic motion where the restoring force is directly proportional to the displacement.
[13] When a strong beam of light is passed through a colloidal solution, the light will –
A.
be scattered
B.
pass unchanged
C.
be absorbed
D.
be reflected
Ans:
be scattered
Explanation :
When a strong beam of light is passed through a colloidal solution, the light will be scattered.
[14] Which one of the following is not allied to Geophysical Sciences?
A.
Hydrology
B.
Meteorology
C.
Palaeontology
D.
Seismology
Ans:
Palaeontology
Explanation :
Palaeontology is the study of fossils and the evolution of life on Earth.
[15] The pitch of sound depends on its –
A.
Frequency
B.
Intensity
C.
Velocity
D.
Amplitude
Ans:
Frequency
Explanation :
Pitch is a perceptual property that allows the ordering of sounds on a frequency-related scale. Pitch may be quantified as a frequency, but pitch is not a purely objective physical property; it is a subjective psycho-acoustical attribute of sound.
[16] The ozone layer protects us from -
A.
Ultra violet rays
B.
Radio waves
C.
Visual radiation
D.
Infrared radiation
Ans:
Ultra violet rays
Explanation :
The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
[17] Entropy of the universe is -
A.
continuously increasing
B.
continuously decreasing
C.
zero
D.
constant
Ans:
continuously increasing
Explanation :
In an irreversible process, entropy always increases, so the change in entropy is positive. The total entropy of the universe is continually increasing.
[18] For which among the following house appliances, magnet is an essential part?
A.
Calling bell
B.
Fan
C.
Washing machine
D.
All of the above
Ans:
All of the above
Explanation :
0
[19] Cylindrical lens is used by a person suffering from -
A.
astigmatism
B.
myopia
C.
hypermetropia
D.
None of these
Ans:
astigmatism
Explanation :
A cylindrical lens is typically used to focus, condense or expand incoming light. A cylindrical lens has one cylindrical surface, causing light to be focused in a single dimension or axis.
[20] Metals are good conductors of electricity because -
A.
they contain free electrons
B.
the atoms are lightly packed
C.
they have high melting point
D.
All of the above
Ans:
they contain free electrons
Explanation :
Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points.
[21] Speed of sound in solids is -
A.
10 times that in gas/ 10
B.
20 times that in gas/ 20
C.
5 times that in gas/ 5
D.
15 times that in gas/ 15
Ans:
15 times that in gas/ 15
Explanation :
Sound travels at 343 m/s in air; it travels at 1,480 m/s in water (4.3 times as fast as in air); and at 5,120 m/s in iron (about 15 times as fast as in air).
[22] To open a door easily, the handle should be fixed –
A.
near the hinges
B.
away from mid-point opposite to hinges
C.
in the middle
D.
None of these
Ans:
None of these
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[23] Dioptere is the unit of –
A.
power of a lens
B.
focal length of a lens
C.
light intensity
D.
sound intensity
Ans:
power of a lens
Explanation :
A dioptre or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length.
[24] Velocity of sound in air does not depend on –
A.
Density of air
B.
Temperature of air
C.
Pressure of air
D.
Humidity of air
Ans:
Pressure of air
Explanation :
Assuming air to be an ideal gas, the speed of sound depends on temperature only. As air temperature increases, so does the speed of sound and vice versa. The speed of sound is completely independent of air pressure because the air pressure and air density are proportional to each other at the same temperature.
[25] Conversion of sound energy into electrical energy is done by –
A.
Solar cell
B.
Gramophone
C.
Microphone
D.
Loudspeaker
Ans:
Microphone
Explanation :
Conversion of sound energy into electrical energy is done by microphone.
Explanation :
A compact fluorescent lamp (CFL) is a fluorescent lamp designed to replace an incandescent lamp; some types fit into light fixtures formerly used for incandescent lamps.
[4] A light year is a unit of –
A.
time
B.
distance
C.
speed of light
D.
intensity of light
Ans:
distance
Explanation :
As defined by the International. Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year. It is a measure of distance (rather than, as is sometimes misunderstood, a measure of time).
[5] An instrument that records earth-quakes is –
A.
Ergograph
B.
Ediograph
C.
Thermograph
D.
Seismograph
Ans:
Seismograph
Explanation :
Earthquakes generate seismic waves which can be detected with a sensitive instrument called a seismograph. The earliest seismograph was invented in China A.D. 136 by a man named Choko.
[6] An object is in static equilibrium when it is .
A.
at rest
B.
moving in a circular path
C.
moving with uniform velocity
D.
accelerating at high speed
Ans:
at rest
Explanation :
0
[7] The study of phenomena at very low temperatures is called -
A.
heat transfer
B.
morphology
C.
crystallography
D.
cryogenics
Ans:
cryogenics
Explanation :
A person who studies elements that have been subjected to extremely cold temperatures is called a cryogenicist.
[8] Steel is more elastic than rubber because it –
A.
requires larger deforming force
B.
Is never deformed
C.
is deformed very easily
D.
is harder than rubber
Ans:
is deformed very easily
Explanation :
Elasticity is the capability of an object to return to its former shape once a load inducing strain is removed. Young Modulus or elastic modulus [tendency to be deformed elastically (i.e., non- permanently) when a force is applied to it] of steel is more than that of rubber.
[9] Which phenomena shows the particle nature of light?
A.
Diffraction
B.
Interference
C.
Photoelectric effect
D.
Polarisation
Ans:
Photoelectric effect
Explanation :
The phenomena such as interference, diffraction, and polarization can only be explained when light is treated as a wave whereas photoelectric effect, line spectra, and the production and scattering of x rays demonstrate the particle nature of light.
[10] In the names Mangifera indica (mango), Solanum tuberosum (potato) and Panthera leo (lion), the terms Mangifera, Solanum and Panthera represent the higher level of?
A.
Taxon
B.
Taxonomic Hierarchy
C.
Specific Epithet
D.
Binomial Nomenclature
Ans:
Taxon
Explanation :
All the three names, indica, tuberosum and leo, represent the specific epithets while the first words Mangifera, Solanum and Panthera are genera and represents another higher level of taxon or category.
[11] Sound waves in air are .
A.
transverse
B.
longitudinal
C.
electromagnetic
D.
polarised
Ans:
longitudinal
Explanation :
Sound can propagate through compressible media such as air, water and solids as longitudinal waves and also as a transverse wave in solids.
[12] The motion of a body that repeats itself after a regular interval of time is –
A.
a periodic motion
B.
a simple harmonic motion
C.
an aperiodic motion
D.
an oscillatory motion
Ans:
a periodic motion
Explanation :
The motion of a body that repeats itself after a regular interval of time is called 'Periodic Motion'. Simple Harmonic Motion is a type of periodic motion where the restoring force is directly proportional to the displacement.
[13] When a strong beam of light is passed through a colloidal solution, the light will –
A.
be scattered
B.
pass unchanged
C.
be absorbed
D.
be reflected
Ans:
be scattered
Explanation :
When a strong beam of light is passed through a colloidal solution, the light will be scattered.
[14] Which one of the following is not allied to Geophysical Sciences?
A.
Hydrology
B.
Meteorology
C.
Palaeontology
D.
Seismology
Ans:
Palaeontology
Explanation :
Palaeontology is the study of fossils and the evolution of life on Earth.
[15] The pitch of sound depends on its –
A.
Frequency
B.
Intensity
C.
Velocity
D.
Amplitude
Ans:
Frequency
Explanation :
Pitch is a perceptual property that allows the ordering of sounds on a frequency-related scale. Pitch may be quantified as a frequency, but pitch is not a purely objective physical property; it is a subjective psycho-acoustical attribute of sound.
[16] The ozone layer protects us from -
A.
Ultra violet rays
B.
Radio waves
C.
Visual radiation
D.
Infrared radiation
Ans:
Ultra violet rays
Explanation :
The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
[17] Entropy of the universe is -
A.
continuously increasing
B.
continuously decreasing
C.
zero
D.
constant
Ans:
continuously increasing
Explanation :
In an irreversible process, entropy always increases, so the change in entropy is positive. The total entropy of the universe is continually increasing.
[18] For which among the following house appliances, magnet is an essential part?
A.
Calling bell
B.
Fan
C.
Washing machine
D.
All of the above
Ans:
All of the above
Explanation :
0
[19] Cylindrical lens is used by a person suffering from -
A.
astigmatism
B.
myopia
C.
hypermetropia
D.
None of these
Ans:
astigmatism
Explanation :
A cylindrical lens is typically used to focus, condense or expand incoming light. A cylindrical lens has one cylindrical surface, causing light to be focused in a single dimension or axis.
[20] Metals are good conductors of electricity because -
A.
they contain free electrons
B.
the atoms are lightly packed
C.
they have high melting point
D.
All of the above
Ans:
they contain free electrons
Explanation :
Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points.
[21] Speed of sound in solids is -
A.
10 times that in gas/ 10
B.
20 times that in gas/ 20
C.
5 times that in gas/ 5
D.
15 times that in gas/ 15
Ans:
15 times that in gas/ 15
Explanation :
Sound travels at 343 m/s in air; it travels at 1,480 m/s in water (4.3 times as fast as in air); and at 5,120 m/s in iron (about 15 times as fast as in air).
[22] To open a door easily, the handle should be fixed –
A.
near the hinges
B.
away from mid-point opposite to hinges
C.
in the middle
D.
None of these
Ans:
None of these
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[23] Dioptere is the unit of –
A.
power of a lens
B.
focal length of a lens
C.
light intensity
D.
sound intensity
Ans:
power of a lens
Explanation :
A dioptre or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length.
[24] Velocity of sound in air does not depend on –
A.
Density of air
B.
Temperature of air
C.
Pressure of air
D.
Humidity of air
Ans:
Pressure of air
Explanation :
Assuming air to be an ideal gas, the speed of sound depends on temperature only. As air temperature increases, so does the speed of sound and vice versa. The speed of sound is completely independent of air pressure because the air pressure and air density are proportional to each other at the same temperature.
[25] Conversion of sound energy into electrical energy is done by –
A.
Solar cell
B.
Gramophone
C.
Microphone
D.
Loudspeaker
Ans:
Microphone
Explanation :
Conversion of sound energy into electrical energy is done by microphone.
Explanation :
Earthquakes generate seismic waves which can be detected with a sensitive instrument called a seismograph. The earliest seismograph was invented in China A.D. 136 by a man named Choko.
[6] An object is in static equilibrium when it is .
A.
at rest
B.
moving in a circular path
C.
moving with uniform velocity
D.
accelerating at high speed
Ans:
at rest
Explanation :
0
[7] The study of phenomena at very low temperatures is called -
A.
heat transfer
B.
morphology
C.
crystallography
D.
cryogenics
Ans:
cryogenics
Explanation :
A person who studies elements that have been subjected to extremely cold temperatures is called a cryogenicist.
[8] Steel is more elastic than rubber because it –
A.
requires larger deforming force
B.
Is never deformed
C.
is deformed very easily
D.
is harder than rubber
Ans:
is deformed very easily
Explanation :
Elasticity is the capability of an object to return to its former shape once a load inducing strain is removed. Young Modulus or elastic modulus [tendency to be deformed elastically (i.e., non- permanently) when a force is applied to it] of steel is more than that of rubber.
[9] Which phenomena shows the particle nature of light?
A.
Diffraction
B.
Interference
C.
Photoelectric effect
D.
Polarisation
Ans:
Photoelectric effect
Explanation :
The phenomena such as interference, diffraction, and polarization can only be explained when light is treated as a wave whereas photoelectric effect, line spectra, and the production and scattering of x rays demonstrate the particle nature of light.
[10] In the names Mangifera indica (mango), Solanum tuberosum (potato) and Panthera leo (lion), the terms Mangifera, Solanum and Panthera represent the higher level of?
A.
Taxon
B.
Taxonomic Hierarchy
C.
Specific Epithet
D.
Binomial Nomenclature
Ans:
Taxon
Explanation :
All the three names, indica, tuberosum and leo, represent the specific epithets while the first words Mangifera, Solanum and Panthera are genera and represents another higher level of taxon or category.
[11] Sound waves in air are .
A.
transverse
B.
longitudinal
C.
electromagnetic
D.
polarised
Ans:
longitudinal
Explanation :
Sound can propagate through compressible media such as air, water and solids as longitudinal waves and also as a transverse wave in solids.
[12] The motion of a body that repeats itself after a regular interval of time is –
A.
a periodic motion
B.
a simple harmonic motion
C.
an aperiodic motion
D.
an oscillatory motion
Ans:
a periodic motion
Explanation :
The motion of a body that repeats itself after a regular interval of time is called 'Periodic Motion'. Simple Harmonic Motion is a type of periodic motion where the restoring force is directly proportional to the displacement.
[13] When a strong beam of light is passed through a colloidal solution, the light will –
A.
be scattered
B.
pass unchanged
C.
be absorbed
D.
be reflected
Ans:
be scattered
Explanation :
When a strong beam of light is passed through a colloidal solution, the light will be scattered.
[14] Which one of the following is not allied to Geophysical Sciences?
A.
Hydrology
B.
Meteorology
C.
Palaeontology
D.
Seismology
Ans:
Palaeontology
Explanation :
Palaeontology is the study of fossils and the evolution of life on Earth.
[15] The pitch of sound depends on its –
A.
Frequency
B.
Intensity
C.
Velocity
D.
Amplitude
Ans:
Frequency
Explanation :
Pitch is a perceptual property that allows the ordering of sounds on a frequency-related scale. Pitch may be quantified as a frequency, but pitch is not a purely objective physical property; it is a subjective psycho-acoustical attribute of sound.
[16] The ozone layer protects us from -
A.
Ultra violet rays
B.
Radio waves
C.
Visual radiation
D.
Infrared radiation
Ans:
Ultra violet rays
Explanation :
The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
[17] Entropy of the universe is -
A.
continuously increasing
B.
continuously decreasing
C.
zero
D.
constant
Ans:
continuously increasing
Explanation :
In an irreversible process, entropy always increases, so the change in entropy is positive. The total entropy of the universe is continually increasing.
[18] For which among the following house appliances, magnet is an essential part?
A.
Calling bell
B.
Fan
C.
Washing machine
D.
All of the above
Ans:
All of the above
Explanation :
0
[19] Cylindrical lens is used by a person suffering from -
A.
astigmatism
B.
myopia
C.
hypermetropia
D.
None of these
Ans:
astigmatism
Explanation :
A cylindrical lens is typically used to focus, condense or expand incoming light. A cylindrical lens has one cylindrical surface, causing light to be focused in a single dimension or axis.
[20] Metals are good conductors of electricity because -
A.
they contain free electrons
B.
the atoms are lightly packed
C.
they have high melting point
D.
All of the above
Ans:
they contain free electrons
Explanation :
Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points.
[21] Speed of sound in solids is -
A.
10 times that in gas/ 10
B.
20 times that in gas/ 20
C.
5 times that in gas/ 5
D.
15 times that in gas/ 15
Ans:
15 times that in gas/ 15
Explanation :
Sound travels at 343 m/s in air; it travels at 1,480 m/s in water (4.3 times as fast as in air); and at 5,120 m/s in iron (about 15 times as fast as in air).
[22] To open a door easily, the handle should be fixed –
A.
near the hinges
B.
away from mid-point opposite to hinges
C.
in the middle
D.
None of these
Ans:
None of these
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[23] Dioptere is the unit of –
A.
power of a lens
B.
focal length of a lens
C.
light intensity
D.
sound intensity
Ans:
power of a lens
Explanation :
A dioptre or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length.
[24] Velocity of sound in air does not depend on –
A.
Density of air
B.
Temperature of air
C.
Pressure of air
D.
Humidity of air
Ans:
Pressure of air
Explanation :
Assuming air to be an ideal gas, the speed of sound depends on temperature only. As air temperature increases, so does the speed of sound and vice versa. The speed of sound is completely independent of air pressure because the air pressure and air density are proportional to each other at the same temperature.
[25] Conversion of sound energy into electrical energy is done by –
A.
Solar cell
B.
Gramophone
C.
Microphone
D.
Loudspeaker
Ans:
Microphone
Explanation :
Conversion of sound energy into electrical energy is done by microphone.
Explanation :
A person who studies elements that have been subjected to extremely cold temperatures is called a cryogenicist.
[8] Steel is more elastic than rubber because it –
A.
requires larger deforming force
B.
Is never deformed
C.
is deformed very easily
D.
is harder than rubber
Ans:
is deformed very easily
Explanation :
Elasticity is the capability of an object to return to its former shape once a load inducing strain is removed. Young Modulus or elastic modulus [tendency to be deformed elastically (i.e., non- permanently) when a force is applied to it] of steel is more than that of rubber.
[9] Which phenomena shows the particle nature of light?
A.
Diffraction
B.
Interference
C.
Photoelectric effect
D.
Polarisation
Ans:
Photoelectric effect
Explanation :
The phenomena such as interference, diffraction, and polarization can only be explained when light is treated as a wave whereas photoelectric effect, line spectra, and the production and scattering of x rays demonstrate the particle nature of light.
[10] In the names Mangifera indica (mango), Solanum tuberosum (potato) and Panthera leo (lion), the terms Mangifera, Solanum and Panthera represent the higher level of?
A.
Taxon
B.
Taxonomic Hierarchy
C.
Specific Epithet
D.
Binomial Nomenclature
Ans:
Taxon
Explanation :
All the three names, indica, tuberosum and leo, represent the specific epithets while the first words Mangifera, Solanum and Panthera are genera and represents another higher level of taxon or category.
[11] Sound waves in air are .
A.
transverse
B.
longitudinal
C.
electromagnetic
D.
polarised
Ans:
longitudinal
Explanation :
Sound can propagate through compressible media such as air, water and solids as longitudinal waves and also as a transverse wave in solids.
[12] The motion of a body that repeats itself after a regular interval of time is –
A.
a periodic motion
B.
a simple harmonic motion
C.
an aperiodic motion
D.
an oscillatory motion
Ans:
a periodic motion
Explanation :
The motion of a body that repeats itself after a regular interval of time is called 'Periodic Motion'. Simple Harmonic Motion is a type of periodic motion where the restoring force is directly proportional to the displacement.
[13] When a strong beam of light is passed through a colloidal solution, the light will –
A.
be scattered
B.
pass unchanged
C.
be absorbed
D.
be reflected
Ans:
be scattered
Explanation :
When a strong beam of light is passed through a colloidal solution, the light will be scattered.
[14] Which one of the following is not allied to Geophysical Sciences?
A.
Hydrology
B.
Meteorology
C.
Palaeontology
D.
Seismology
Ans:
Palaeontology
Explanation :
Palaeontology is the study of fossils and the evolution of life on Earth.
[15] The pitch of sound depends on its –
A.
Frequency
B.
Intensity
C.
Velocity
D.
Amplitude
Ans:
Frequency
Explanation :
Pitch is a perceptual property that allows the ordering of sounds on a frequency-related scale. Pitch may be quantified as a frequency, but pitch is not a purely objective physical property; it is a subjective psycho-acoustical attribute of sound.
[16] The ozone layer protects us from -
A.
Ultra violet rays
B.
Radio waves
C.
Visual radiation
D.
Infrared radiation
Ans:
Ultra violet rays
Explanation :
The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
[17] Entropy of the universe is -
A.
continuously increasing
B.
continuously decreasing
C.
zero
D.
constant
Ans:
continuously increasing
Explanation :
In an irreversible process, entropy always increases, so the change in entropy is positive. The total entropy of the universe is continually increasing.
[18] For which among the following house appliances, magnet is an essential part?
A.
Calling bell
B.
Fan
C.
Washing machine
D.
All of the above
Ans:
All of the above
Explanation :
0
[19] Cylindrical lens is used by a person suffering from -
A.
astigmatism
B.
myopia
C.
hypermetropia
D.
None of these
Ans:
astigmatism
Explanation :
A cylindrical lens is typically used to focus, condense or expand incoming light. A cylindrical lens has one cylindrical surface, causing light to be focused in a single dimension or axis.
[20] Metals are good conductors of electricity because -
A.
they contain free electrons
B.
the atoms are lightly packed
C.
they have high melting point
D.
All of the above
Ans:
they contain free electrons
Explanation :
Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points.
[21] Speed of sound in solids is -
A.
10 times that in gas/ 10
B.
20 times that in gas/ 20
C.
5 times that in gas/ 5
D.
15 times that in gas/ 15
Ans:
15 times that in gas/ 15
Explanation :
Sound travels at 343 m/s in air; it travels at 1,480 m/s in water (4.3 times as fast as in air); and at 5,120 m/s in iron (about 15 times as fast as in air).
[22] To open a door easily, the handle should be fixed –
A.
near the hinges
B.
away from mid-point opposite to hinges
C.
in the middle
D.
None of these
Ans:
None of these
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[23] Dioptere is the unit of –
A.
power of a lens
B.
focal length of a lens
C.
light intensity
D.
sound intensity
Ans:
power of a lens
Explanation :
A dioptre or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length.
[24] Velocity of sound in air does not depend on –
A.
Density of air
B.
Temperature of air
C.
Pressure of air
D.
Humidity of air
Ans:
Pressure of air
Explanation :
Assuming air to be an ideal gas, the speed of sound depends on temperature only. As air temperature increases, so does the speed of sound and vice versa. The speed of sound is completely independent of air pressure because the air pressure and air density are proportional to each other at the same temperature.
[25] Conversion of sound energy into electrical energy is done by –
A.
Solar cell
B.
Gramophone
C.
Microphone
D.
Loudspeaker
Ans:
Microphone
Explanation :
Conversion of sound energy into electrical energy is done by microphone.
Explanation :
The phenomena such as interference, diffraction, and polarization can only be explained when light is treated as a wave whereas photoelectric effect, line spectra, and the production and scattering of x rays demonstrate the particle nature of light.
[10] In the names Mangifera indica (mango), Solanum tuberosum (potato) and Panthera leo (lion), the terms Mangifera, Solanum and Panthera represent the higher level of?
A.
Taxon
B.
Taxonomic Hierarchy
C.
Specific Epithet
D.
Binomial Nomenclature
Ans:
Taxon
Explanation :
All the three names, indica, tuberosum and leo, represent the specific epithets while the first words Mangifera, Solanum and Panthera are genera and represents another higher level of taxon or category.
[11] Sound waves in air are .
A.
transverse
B.
longitudinal
C.
electromagnetic
D.
polarised
Ans:
longitudinal
Explanation :
Sound can propagate through compressible media such as air, water and solids as longitudinal waves and also as a transverse wave in solids.
[12] The motion of a body that repeats itself after a regular interval of time is –
A.
a periodic motion
B.
a simple harmonic motion
C.
an aperiodic motion
D.
an oscillatory motion
Ans:
a periodic motion
Explanation :
The motion of a body that repeats itself after a regular interval of time is called 'Periodic Motion'. Simple Harmonic Motion is a type of periodic motion where the restoring force is directly proportional to the displacement.
[13] When a strong beam of light is passed through a colloidal solution, the light will –
A.
be scattered
B.
pass unchanged
C.
be absorbed
D.
be reflected
Ans:
be scattered
Explanation :
When a strong beam of light is passed through a colloidal solution, the light will be scattered.
[14] Which one of the following is not allied to Geophysical Sciences?
A.
Hydrology
B.
Meteorology
C.
Palaeontology
D.
Seismology
Ans:
Palaeontology
Explanation :
Palaeontology is the study of fossils and the evolution of life on Earth.
[15] The pitch of sound depends on its –
A.
Frequency
B.
Intensity
C.
Velocity
D.
Amplitude
Ans:
Frequency
Explanation :
Pitch is a perceptual property that allows the ordering of sounds on a frequency-related scale. Pitch may be quantified as a frequency, but pitch is not a purely objective physical property; it is a subjective psycho-acoustical attribute of sound.
[16] The ozone layer protects us from -
A.
Ultra violet rays
B.
Radio waves
C.
Visual radiation
D.
Infrared radiation
Ans:
Ultra violet rays
Explanation :
The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
[17] Entropy of the universe is -
A.
continuously increasing
B.
continuously decreasing
C.
zero
D.
constant
Ans:
continuously increasing
Explanation :
In an irreversible process, entropy always increases, so the change in entropy is positive. The total entropy of the universe is continually increasing.
[18] For which among the following house appliances, magnet is an essential part?
A.
Calling bell
B.
Fan
C.
Washing machine
D.
All of the above
Ans:
All of the above
Explanation :
0
[19] Cylindrical lens is used by a person suffering from -
A.
astigmatism
B.
myopia
C.
hypermetropia
D.
None of these
Ans:
astigmatism
Explanation :
A cylindrical lens is typically used to focus, condense or expand incoming light. A cylindrical lens has one cylindrical surface, causing light to be focused in a single dimension or axis.
[20] Metals are good conductors of electricity because -
A.
they contain free electrons
B.
the atoms are lightly packed
C.
they have high melting point
D.
All of the above
Ans:
they contain free electrons
Explanation :
Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points.
[21] Speed of sound in solids is -
A.
10 times that in gas/ 10
B.
20 times that in gas/ 20
C.
5 times that in gas/ 5
D.
15 times that in gas/ 15
Ans:
15 times that in gas/ 15
Explanation :
Sound travels at 343 m/s in air; it travels at 1,480 m/s in water (4.3 times as fast as in air); and at 5,120 m/s in iron (about 15 times as fast as in air).
[22] To open a door easily, the handle should be fixed –
A.
near the hinges
B.
away from mid-point opposite to hinges
C.
in the middle
D.
None of these
Ans:
None of these
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[23] Dioptere is the unit of –
A.
power of a lens
B.
focal length of a lens
C.
light intensity
D.
sound intensity
Ans:
power of a lens
Explanation :
A dioptre or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length.
[24] Velocity of sound in air does not depend on –
A.
Density of air
B.
Temperature of air
C.
Pressure of air
D.
Humidity of air
Ans:
Pressure of air
Explanation :
Assuming air to be an ideal gas, the speed of sound depends on temperature only. As air temperature increases, so does the speed of sound and vice versa. The speed of sound is completely independent of air pressure because the air pressure and air density are proportional to each other at the same temperature.
[25] Conversion of sound energy into electrical energy is done by –
A.
Solar cell
B.
Gramophone
C.
Microphone
D.
Loudspeaker
Ans:
Microphone
Explanation :
Conversion of sound energy into electrical energy is done by microphone.
Explanation :
Sound can propagate through compressible media such as air, water and solids as longitudinal waves and also as a transverse wave in solids.
[12] The motion of a body that repeats itself after a regular interval of time is –
A.
a periodic motion
B.
a simple harmonic motion
C.
an aperiodic motion
D.
an oscillatory motion
Ans:
a periodic motion
Explanation :
The motion of a body that repeats itself after a regular interval of time is called 'Periodic Motion'. Simple Harmonic Motion is a type of periodic motion where the restoring force is directly proportional to the displacement.
[13] When a strong beam of light is passed through a colloidal solution, the light will –
A.
be scattered
B.
pass unchanged
C.
be absorbed
D.
be reflected
Ans:
be scattered
Explanation :
When a strong beam of light is passed through a colloidal solution, the light will be scattered.
[14] Which one of the following is not allied to Geophysical Sciences?
A.
Hydrology
B.
Meteorology
C.
Palaeontology
D.
Seismology
Ans:
Palaeontology
Explanation :
Palaeontology is the study of fossils and the evolution of life on Earth.
[15] The pitch of sound depends on its –
A.
Frequency
B.
Intensity
C.
Velocity
D.
Amplitude
Ans:
Frequency
Explanation :
Pitch is a perceptual property that allows the ordering of sounds on a frequency-related scale. Pitch may be quantified as a frequency, but pitch is not a purely objective physical property; it is a subjective psycho-acoustical attribute of sound.
[16] The ozone layer protects us from -
A.
Ultra violet rays
B.
Radio waves
C.
Visual radiation
D.
Infrared radiation
Ans:
Ultra violet rays
Explanation :
The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
[17] Entropy of the universe is -
A.
continuously increasing
B.
continuously decreasing
C.
zero
D.
constant
Ans:
continuously increasing
Explanation :
In an irreversible process, entropy always increases, so the change in entropy is positive. The total entropy of the universe is continually increasing.
[18] For which among the following house appliances, magnet is an essential part?
A.
Calling bell
B.
Fan
C.
Washing machine
D.
All of the above
Ans:
All of the above
Explanation :
0
[19] Cylindrical lens is used by a person suffering from -
A.
astigmatism
B.
myopia
C.
hypermetropia
D.
None of these
Ans:
astigmatism
Explanation :
A cylindrical lens is typically used to focus, condense or expand incoming light. A cylindrical lens has one cylindrical surface, causing light to be focused in a single dimension or axis.
[20] Metals are good conductors of electricity because -
A.
they contain free electrons
B.
the atoms are lightly packed
C.
they have high melting point
D.
All of the above
Ans:
they contain free electrons
Explanation :
Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points.
[21] Speed of sound in solids is -
A.
10 times that in gas/ 10
B.
20 times that in gas/ 20
C.
5 times that in gas/ 5
D.
15 times that in gas/ 15
Ans:
15 times that in gas/ 15
Explanation :
Sound travels at 343 m/s in air; it travels at 1,480 m/s in water (4.3 times as fast as in air); and at 5,120 m/s in iron (about 15 times as fast as in air).
[22] To open a door easily, the handle should be fixed –
A.
near the hinges
B.
away from mid-point opposite to hinges
C.
in the middle
D.
None of these
Ans:
None of these
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[23] Dioptere is the unit of –
A.
power of a lens
B.
focal length of a lens
C.
light intensity
D.
sound intensity
Ans:
power of a lens
Explanation :
A dioptre or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length.
[24] Velocity of sound in air does not depend on –
A.
Density of air
B.
Temperature of air
C.
Pressure of air
D.
Humidity of air
Ans:
Pressure of air
Explanation :
Assuming air to be an ideal gas, the speed of sound depends on temperature only. As air temperature increases, so does the speed of sound and vice versa. The speed of sound is completely independent of air pressure because the air pressure and air density are proportional to each other at the same temperature.
[25] Conversion of sound energy into electrical energy is done by –
A.
Solar cell
B.
Gramophone
C.
Microphone
D.
Loudspeaker
Ans:
Microphone
Explanation :
Conversion of sound energy into electrical energy is done by microphone.
Explanation :
When a strong beam of light is passed through a colloidal solution, the light will be scattered.
[14] Which one of the following is not allied to Geophysical Sciences?
A.
Hydrology
B.
Meteorology
C.
Palaeontology
D.
Seismology
Ans:
Palaeontology
Explanation :
Palaeontology is the study of fossils and the evolution of life on Earth.
[15] The pitch of sound depends on its –
A.
Frequency
B.
Intensity
C.
Velocity
D.
Amplitude
Ans:
Frequency
Explanation :
Pitch is a perceptual property that allows the ordering of sounds on a frequency-related scale. Pitch may be quantified as a frequency, but pitch is not a purely objective physical property; it is a subjective psycho-acoustical attribute of sound.
[16] The ozone layer protects us from -
A.
Ultra violet rays
B.
Radio waves
C.
Visual radiation
D.
Infrared radiation
Ans:
Ultra violet rays
Explanation :
The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
[17] Entropy of the universe is -
A.
continuously increasing
B.
continuously decreasing
C.
zero
D.
constant
Ans:
continuously increasing
Explanation :
In an irreversible process, entropy always increases, so the change in entropy is positive. The total entropy of the universe is continually increasing.
[18] For which among the following house appliances, magnet is an essential part?
A.
Calling bell
B.
Fan
C.
Washing machine
D.
All of the above
Ans:
All of the above
Explanation :
0
[19] Cylindrical lens is used by a person suffering from -
A.
astigmatism
B.
myopia
C.
hypermetropia
D.
None of these
Ans:
astigmatism
Explanation :
A cylindrical lens is typically used to focus, condense or expand incoming light. A cylindrical lens has one cylindrical surface, causing light to be focused in a single dimension or axis.
[20] Metals are good conductors of electricity because -
A.
they contain free electrons
B.
the atoms are lightly packed
C.
they have high melting point
D.
All of the above
Ans:
they contain free electrons
Explanation :
Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points.
[21] Speed of sound in solids is -
A.
10 times that in gas/ 10
B.
20 times that in gas/ 20
C.
5 times that in gas/ 5
D.
15 times that in gas/ 15
Ans:
15 times that in gas/ 15
Explanation :
Sound travels at 343 m/s in air; it travels at 1,480 m/s in water (4.3 times as fast as in air); and at 5,120 m/s in iron (about 15 times as fast as in air).
[22] To open a door easily, the handle should be fixed –
A.
near the hinges
B.
away from mid-point opposite to hinges
C.
in the middle
D.
None of these
Ans:
None of these
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[23] Dioptere is the unit of –
A.
power of a lens
B.
focal length of a lens
C.
light intensity
D.
sound intensity
Ans:
power of a lens
Explanation :
A dioptre or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length.
[24] Velocity of sound in air does not depend on –
A.
Density of air
B.
Temperature of air
C.
Pressure of air
D.
Humidity of air
Ans:
Pressure of air
Explanation :
Assuming air to be an ideal gas, the speed of sound depends on temperature only. As air temperature increases, so does the speed of sound and vice versa. The speed of sound is completely independent of air pressure because the air pressure and air density are proportional to each other at the same temperature.
[25] Conversion of sound energy into electrical energy is done by –
A.
Solar cell
B.
Gramophone
C.
Microphone
D.
Loudspeaker
Ans:
Microphone
Explanation :
Conversion of sound energy into electrical energy is done by microphone.
Explanation :
Pitch is a perceptual property that allows the ordering of sounds on a frequency-related scale. Pitch may be quantified as a frequency, but pitch is not a purely objective physical property; it is a subjective psycho-acoustical attribute of sound.
[16] The ozone layer protects us from -
A.
Ultra violet rays
B.
Radio waves
C.
Visual radiation
D.
Infrared radiation
Ans:
Ultra violet rays
Explanation :
The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
[17] Entropy of the universe is -
A.
continuously increasing
B.
continuously decreasing
C.
zero
D.
constant
Ans:
continuously increasing
Explanation :
In an irreversible process, entropy always increases, so the change in entropy is positive. The total entropy of the universe is continually increasing.
[18] For which among the following house appliances, magnet is an essential part?
A.
Calling bell
B.
Fan
C.
Washing machine
D.
All of the above
Ans:
All of the above
Explanation :
0
[19] Cylindrical lens is used by a person suffering from -
A.
astigmatism
B.
myopia
C.
hypermetropia
D.
None of these
Ans:
astigmatism
Explanation :
A cylindrical lens is typically used to focus, condense or expand incoming light. A cylindrical lens has one cylindrical surface, causing light to be focused in a single dimension or axis.
[20] Metals are good conductors of electricity because -
A.
they contain free electrons
B.
the atoms are lightly packed
C.
they have high melting point
D.
All of the above
Ans:
they contain free electrons
Explanation :
Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points.
[21] Speed of sound in solids is -
A.
10 times that in gas/ 10
B.
20 times that in gas/ 20
C.
5 times that in gas/ 5
D.
15 times that in gas/ 15
Ans:
15 times that in gas/ 15
Explanation :
Sound travels at 343 m/s in air; it travels at 1,480 m/s in water (4.3 times as fast as in air); and at 5,120 m/s in iron (about 15 times as fast as in air).
[22] To open a door easily, the handle should be fixed –
A.
near the hinges
B.
away from mid-point opposite to hinges
C.
in the middle
D.
None of these
Ans:
None of these
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[23] Dioptere is the unit of –
A.
power of a lens
B.
focal length of a lens
C.
light intensity
D.
sound intensity
Ans:
power of a lens
Explanation :
A dioptre or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length.
[24] Velocity of sound in air does not depend on –
A.
Density of air
B.
Temperature of air
C.
Pressure of air
D.
Humidity of air
Ans:
Pressure of air
Explanation :
Assuming air to be an ideal gas, the speed of sound depends on temperature only. As air temperature increases, so does the speed of sound and vice versa. The speed of sound is completely independent of air pressure because the air pressure and air density are proportional to each other at the same temperature.
[25] Conversion of sound energy into electrical energy is done by –
A.
Solar cell
B.
Gramophone
C.
Microphone
D.
Loudspeaker
Ans:
Microphone
Explanation :
Conversion of sound energy into electrical energy is done by microphone.
Explanation :
In an irreversible process, entropy always increases, so the change in entropy is positive. The total entropy of the universe is continually increasing.
[18] For which among the following house appliances, magnet is an essential part?
A.
Calling bell
B.
Fan
C.
Washing machine
D.
All of the above
Ans:
All of the above
Explanation :
0
[19] Cylindrical lens is used by a person suffering from -
A.
astigmatism
B.
myopia
C.
hypermetropia
D.
None of these
Ans:
astigmatism
Explanation :
A cylindrical lens is typically used to focus, condense or expand incoming light. A cylindrical lens has one cylindrical surface, causing light to be focused in a single dimension or axis.
[20] Metals are good conductors of electricity because -
A.
they contain free electrons
B.
the atoms are lightly packed
C.
they have high melting point
D.
All of the above
Ans:
they contain free electrons
Explanation :
Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points.
[21] Speed of sound in solids is -
A.
10 times that in gas/ 10
B.
20 times that in gas/ 20
C.
5 times that in gas/ 5
D.
15 times that in gas/ 15
Ans:
15 times that in gas/ 15
Explanation :
Sound travels at 343 m/s in air; it travels at 1,480 m/s in water (4.3 times as fast as in air); and at 5,120 m/s in iron (about 15 times as fast as in air).
[22] To open a door easily, the handle should be fixed –
A.
near the hinges
B.
away from mid-point opposite to hinges
C.
in the middle
D.
None of these
Ans:
None of these
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[23] Dioptere is the unit of –
A.
power of a lens
B.
focal length of a lens
C.
light intensity
D.
sound intensity
Ans:
power of a lens
Explanation :
A dioptre or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length.
[24] Velocity of sound in air does not depend on –
A.
Density of air
B.
Temperature of air
C.
Pressure of air
D.
Humidity of air
Ans:
Pressure of air
Explanation :
Assuming air to be an ideal gas, the speed of sound depends on temperature only. As air temperature increases, so does the speed of sound and vice versa. The speed of sound is completely independent of air pressure because the air pressure and air density are proportional to each other at the same temperature.
[25] Conversion of sound energy into electrical energy is done by –
A.
Solar cell
B.
Gramophone
C.
Microphone
D.
Loudspeaker
Ans:
Microphone
Explanation :
Conversion of sound energy into electrical energy is done by microphone.
Explanation :
A cylindrical lens is typically used to focus, condense or expand incoming light. A cylindrical lens has one cylindrical surface, causing light to be focused in a single dimension or axis.
[20] Metals are good conductors of electricity because -
A.
they contain free electrons
B.
the atoms are lightly packed
C.
they have high melting point
D.
All of the above
Ans:
they contain free electrons
Explanation :
Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points.
[21] Speed of sound in solids is -
A.
10 times that in gas/ 10
B.
20 times that in gas/ 20
C.
5 times that in gas/ 5
D.
15 times that in gas/ 15
Ans:
15 times that in gas/ 15
Explanation :
Sound travels at 343 m/s in air; it travels at 1,480 m/s in water (4.3 times as fast as in air); and at 5,120 m/s in iron (about 15 times as fast as in air).
[22] To open a door easily, the handle should be fixed –
A.
near the hinges
B.
away from mid-point opposite to hinges
C.
in the middle
D.
None of these
Ans:
None of these
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[23] Dioptere is the unit of –
A.
power of a lens
B.
focal length of a lens
C.
light intensity
D.
sound intensity
Ans:
power of a lens
Explanation :
A dioptre or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length.
[24] Velocity of sound in air does not depend on –
A.
Density of air
B.
Temperature of air
C.
Pressure of air
D.
Humidity of air
Ans:
Pressure of air
Explanation :
Assuming air to be an ideal gas, the speed of sound depends on temperature only. As air temperature increases, so does the speed of sound and vice versa. The speed of sound is completely independent of air pressure because the air pressure and air density are proportional to each other at the same temperature.
[25] Conversion of sound energy into electrical energy is done by –
A.
Solar cell
B.
Gramophone
C.
Microphone
D.
Loudspeaker
Ans:
Microphone
Explanation :
Conversion of sound energy into electrical energy is done by microphone.
Explanation :
Sound travels at 343 m/s in air; it travels at 1,480 m/s in water (4.3 times as fast as in air); and at 5,120 m/s in iron (about 15 times as fast as in air).
[22] To open a door easily, the handle should be fixed –
A.
near the hinges
B.
away from mid-point opposite to hinges
C.
in the middle
D.
None of these
Ans:
None of these
Explanation :
Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.
[23] Dioptere is the unit of –
A.
power of a lens
B.
focal length of a lens
C.
light intensity
D.
sound intensity
Ans:
power of a lens
Explanation :
A dioptre or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length.
[24] Velocity of sound in air does not depend on –
A.
Density of air
B.
Temperature of air
C.
Pressure of air
D.
Humidity of air
Ans:
Pressure of air
Explanation :
Assuming air to be an ideal gas, the speed of sound depends on temperature only. As air temperature increases, so does the speed of sound and vice versa. The speed of sound is completely independent of air pressure because the air pressure and air density are proportional to each other at the same temperature.
[25] Conversion of sound energy into electrical energy is done by –
A.
Solar cell
B.
Gramophone
C.
Microphone
D.
Loudspeaker
Ans:
Microphone
Explanation :
Conversion of sound energy into electrical energy is done by microphone.
Explanation :
A dioptre or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). It is thus a unit of reciprocal length.
[24] Velocity of sound in air does not depend on –
A.
Density of air
B.
Temperature of air
C.
Pressure of air
D.
Humidity of air
Ans:
Pressure of air
Explanation :
Assuming air to be an ideal gas, the speed of sound depends on temperature only. As air temperature increases, so does the speed of sound and vice versa. The speed of sound is completely independent of air pressure because the air pressure and air density are proportional to each other at the same temperature.
[25] Conversion of sound energy into electrical energy is done by –
A.
Solar cell
B.
Gramophone
C.
Microphone
D.
Loudspeaker
Ans:
Microphone
Explanation :
Conversion of sound energy into electrical energy is done by microphone.
Explanation :
Conversion of sound energy into electrical energy is done by microphone.