[1] If in a motion, the axis of the rotation passes through an object, then the motion is called.
A.
Orbital motion
B.
Circulatory motion
C.
Spin motion
D.
Oscillatory motion
Ans:
Spin motion
Explanation :
A rotation is a circular movement of an object around a center (or point) of rotation A three- dimensional object always rotates around an imaginary line called a rotation axis.
[2] Of the following properties of a wave, the one that is independent of the other is its –
A.
amplitude
B.
velocity
C.
wavelength
D.
frequency
Ans:
amplitude
Explanation :
We know that velocity of wave (v)= frequency (f)× wavelength (λ). Thus, we can say that the amplitude (A) is independent of other means it is not related to the other quantities.
[3] Noise is measured in –
A.
Watt
B.
REM
C.
Centigrade
D.
Decibel
Ans:
Decibel
Explanation :
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities.
[4] If ice floating on water in a vessel melts, the water level in the vessel .
A.
increases
B.
does not change
C.
first increases before decreasing
D.
decreases
Ans:
does not change
Explanation :
When ice floating on water in a vessel melts, the water level in the vessel does not change. This is because when floating, the ice displaces an amount of water equal to its mass, and when melted, it becomes an amount of water equal to its mass.
[5] ATM stands for –
A.
Automatic Teller Machine
B.
Automated Teller Machine
C.
Automatic Tally Machine
D.
Automated Tally Mechanism
Ans:
Automatic Teller Machine
Explanation :
An automated teller machine or automatic teller machine (ATM) is a computerized telecommunications device that provides the clients of a financial institution with access to financial transactions in a public space without the need for a cashier, human clerk or bank teller. ATMs are known by various other names including Arm machine, automated banking machine, "cash dispenser" (Germany) and various regional variants derived from trademarks on ATM systems held by particular banks.
[6] The first synthetic fibre made by man was-
A.
Rayon
B.
Nylon
C.
Polyester
D.
Terycott
Ans:
Nylon
Explanation :
Nylon, the first synthetic fiber in the "fully synthetic" sense of that term, was developed by Wallace Carothers, an American researcher at the chemical firm DuPont in the 1930s.
[7] Compared to fresh Water, the freezing point of sea water is -
A.
Higher
B.
Lower
C.
Same
D.
Depends on the sea from which the water is sourced
Ans:
Lower
Explanation :
Ocean water freezes just like freshwater, but at lower temperatures.
[8] Which colour is the complementary colour of yellow?
A.
Blue
B.
Green
C.
Orange
D.
Red
Ans:
Blue
Explanation :
Complementary colours are pairs of colours that are of "opposite" hue in some colour model. In colour theory, two colours are called complementary if, when mixed in the proper proportion, they produce a neutral colour (grey, white, or black). In roughly-perceptual colour models, the neutral colours (white, grey, and black) lie along a central axis.
[9] Which of the following produces more severe burns?
A.
Boiling water
B.
Hot water
C.
Steam
D.
Melting Iceberg
Ans:
Steam
Explanation :
A burn is an injury to the body's tissue resulting from heat, chemicals, electricity or sunlight. Burns are often classified as first degree (those causing damage to the outer layer of the skin, the epidermis), second degree (causing deeper damage to the dermis, the layer beneath the epidermis), third degree (those causing the deepest and most severe damage destruction of all layers of the skin and damage to tissues underneath.
[10] The sudden fall of atmospheric pressure indicates –
A.
fair weather
B.
storm
C.
rain
D.
cold weather
Ans:
storm
Explanation :
Atmospheric pressure is basically the weight of air in the atmosphere above the reservoir, so the level of mercury continues to change until the weight of mercury in the glass tube is exactly equal to the weight of air above the reservoir.
[11] The energy emitted by the Sun is due to –
A.
Chemical reaction
B.
Nuclear fission
C.
Nuclear fusion
D.
All of the above
Ans:
Nuclear fusion
Explanation :
The spectrum of the Sun's solar radiation is close to that of a black body with a temperature of about 5,800 K. The Sun emits Electromagnetic radiation across most of the electromagnetic spectrum. Although the Sun produces Gamma rays as a result of the nuclear fusion process, these super high energy photons are converted to lower energy photons before they reach the Sun's surface and are emitted out into space.
[12] The sky appears blue because of –
A.
Atmospheric water vapour
B.
Scattering of light
C.
Reflection on sea water
D.
Emission of blue wavelength by the sun
Ans:
Scattering of light
Explanation :
The sky is blue because the molecules in the air scatter light in the higher wavelengths (that is, the blue light), while lower wavelength light (that is, the light on the red end of the spectrum) goes through to the ground. So the light that get finally reflected down from the scattering is blue, therefore a blue sky. This is called Rayleigh scattering.
[13] The metal whose electrical conductivity is more, is –
A.
copper
B.
aluminium
C.
silver
D.
lead
Ans:
silver
Explanation :
Copper ; 9% less conductive than silver: aluminum is 1 0% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[14] What happens to a liquid, when the vapour pressure equals the atmospheric pressure?
A.
The liquid cools
B.
The liquid boils
C.
No change
D.
The liquid evaporates
Ans:
The liquid boils
Explanation :
Ordinary evaporation is a surface phenomenon -since the vapor pressure is low and since the pressure inside the liquid is equal to atmospheric pressure plus the liquid pressure, bubbles of water vapor cannot form. But at the boiling point, the saturated vapor pressure is equal to atmospheric pressure, bubbles form, and the vaporization becomes a volume phenomena.
[15] Why do brads not have respiratory trouble at the time of flying at high all?
A.
Their lungs are very large
B.
They fly inactively
C.
They have extra air sacs
D.
They use less
Ans:
They have extra air sacs
Explanation :
The avian respiratory system delivers oxygen from the air to the tissues and also removes carbon dioxide. In addition, the respiratory system plays an important role in thermoregulation (maintaining normal body temperature). The avian respiratory system is different from that of other vertebrates, with birds having relatively small lungs plus nine air sacs that play an important role in respiration (but are not directly involved in the exchange of gases).
[16] The temperature which has the same reading on both Fahrenheit and Celsius scales is –
A.
40°
B.
-400
C.
-34°
D.
-1400
Ans:
-400
Explanation :
If C is the temperature in Celsius and F is the temperature in Fahrenheit then, C/S = (F-32)/9. They are equal at -40° (minus 40 degrees), because if we convert the readings of Celsius and Fahrenheit, we will have: Celsius to Fahrenheit (-40°C x 9/5) +32 = -72 + 32 = -40°F. Fahrenheit to Celsius (-40°F - 32°) x 5/9 = (-72) x 5/9 = -40°C.
[17] Kilowatt-hour is the unit of :
A.
Energy
B.
Power
C.
Force
D.
Momentum
Ans:
Energy
Explanation :
The kilowatt hour, or kilowatt-hour, is a unit of energy equal to 1000 watt hours or 3.6 mega-joules For constant power, energy in watt hours is the product of power in watts and time in hours. The kilowatt hour is most commonly known as a billing unit for energy delivered to consumers by electric utilities.
[18] In nuclear reactor, heavy water is used as –
A.
coolant
B.
fuel
C.
moderator
D.
atomic smasher
Ans:
moderator
Explanation :
Heavy water is used in certain types of nuclear reactors where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium-238 which captures neutrons without fissioning. Because they do not require uranium enrichment, heavy water reactors are of concern in regards to nuclear proliferation.
[19] Tear gas used by the police to disperse the mob contains –
A.
carbon dioxide
B.
chlorine
C.
ammonia
D.
hydrogen sulphide
Ans:
chlorine
Explanation :
Tear gas, formally known as a lachrymatory agent, is a possibly lethal chemical weapon that stimulates the corneal nerves in the eyes to cause tears, pain, and even blindness. The compound 2chlorobenzalmalononitrile (chemical formula: C10H5ClN2), is the defining component of a "tear gas" commonly referred to as CS gas, which is used as a riot control agent.
[20] Mist is caused by –
A.
dry ice
B.
ice at low temperature
C.
water vapour at low temperature
D.
carbon-monoxide in solid form
Ans:
water vapour at low temperature
Explanation :
Mist is a phenomenon caused by small droplets of water suspended in air. It can occur as part of natural weather or volcanic activity, and is common in cold air above warmer water, in exhaled air in the cold, and in a steam room of a sauna. It can also be created artificially with aerosol canisters if the humidity conditions are right. The only difference between mist and fog is visibility.
[21] The ozone layer in the atmosphere is at a height of about .
A.
25 km
B.
50 km
C.
100 km
D.
200 km
Ans:
50 km
Explanation :
Ozone is mainly found in two regions of the Earth's atmosphere. Most ozone (about 90%) resides in a layer that begins between 10 to 17 kilometers above the Earth's surface and extends up to about 50 kilometers
[22] The part of the eye having the largest refractive index is :
A.
cornea
B.
aqueous humor
C.
lens
D.
vitreous humor
Ans:
lens
Explanation :
The cornea represents the strongest part of the refracting power of the eye, providing about 80% of the power of the system. The index of refraction of the cornea is about 1.376. Rays pass from the cornea into the watery fluid known as the aqueous humor which has an index of refraction of about 1.336. The lens provides perhaps 20% of the refracting power of the eye with a refractive index of 1.386-1.406. the refractive Index of Vitreous Humor is 1.33.
[23] Conversion of heat into electrical er is achieved by using –
A.
Ammeter
B.
Hydrometer
C.
Voltmeter
D.
Thermocouple
Ans:
Thermocouple
Explanation :
Thermoelectric generators convert thermal energy into electricity by using heat from the body — or any object with a temperature gradient — as their energy source. At the heart of every thermoelectric generator is an array of thermocouples that are responsible for converting thermal energy into electricity. Bismuth telluride and its alloys are commonly used in thermocouples.
[24] The filament of electric bulb is made of -
A.
Iron
B.
Nichrome
C.
Tungsten
D.
Graphite
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[25] Necessary element of change in solar energy to electric energy –
A.
Berilliurn
B.
Silicon
C.
Tantelum
D.
Pure Copper
Ans:
Silicon
Explanation :
A small solar electric or photovoltaic (PV) converts solar energy into electrical energy. Solar cells consist of semiconductor materials which work on photoelectric effect. Silicon remains the most popular material for solar cells.
Explanation :
A rotation is a circular movement of an object around a center (or point) of rotation A three- dimensional object always rotates around an imaginary line called a rotation axis.
[2] Of the following properties of a wave, the one that is independent of the other is its –
A.
amplitude
B.
velocity
C.
wavelength
D.
frequency
Ans:
amplitude
Explanation :
We know that velocity of wave (v)= frequency (f)× wavelength (λ). Thus, we can say that the amplitude (A) is independent of other means it is not related to the other quantities.
[3] Noise is measured in –
A.
Watt
B.
REM
C.
Centigrade
D.
Decibel
Ans:
Decibel
Explanation :
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities.
[4] If ice floating on water in a vessel melts, the water level in the vessel .
A.
increases
B.
does not change
C.
first increases before decreasing
D.
decreases
Ans:
does not change
Explanation :
When ice floating on water in a vessel melts, the water level in the vessel does not change. This is because when floating, the ice displaces an amount of water equal to its mass, and when melted, it becomes an amount of water equal to its mass.
[5] ATM stands for –
A.
Automatic Teller Machine
B.
Automated Teller Machine
C.
Automatic Tally Machine
D.
Automated Tally Mechanism
Ans:
Automatic Teller Machine
Explanation :
An automated teller machine or automatic teller machine (ATM) is a computerized telecommunications device that provides the clients of a financial institution with access to financial transactions in a public space without the need for a cashier, human clerk or bank teller. ATMs are known by various other names including Arm machine, automated banking machine, "cash dispenser" (Germany) and various regional variants derived from trademarks on ATM systems held by particular banks.
[6] The first synthetic fibre made by man was-
A.
Rayon
B.
Nylon
C.
Polyester
D.
Terycott
Ans:
Nylon
Explanation :
Nylon, the first synthetic fiber in the "fully synthetic" sense of that term, was developed by Wallace Carothers, an American researcher at the chemical firm DuPont in the 1930s.
[7] Compared to fresh Water, the freezing point of sea water is -
A.
Higher
B.
Lower
C.
Same
D.
Depends on the sea from which the water is sourced
Ans:
Lower
Explanation :
Ocean water freezes just like freshwater, but at lower temperatures.
[8] Which colour is the complementary colour of yellow?
A.
Blue
B.
Green
C.
Orange
D.
Red
Ans:
Blue
Explanation :
Complementary colours are pairs of colours that are of "opposite" hue in some colour model. In colour theory, two colours are called complementary if, when mixed in the proper proportion, they produce a neutral colour (grey, white, or black). In roughly-perceptual colour models, the neutral colours (white, grey, and black) lie along a central axis.
[9] Which of the following produces more severe burns?
A.
Boiling water
B.
Hot water
C.
Steam
D.
Melting Iceberg
Ans:
Steam
Explanation :
A burn is an injury to the body's tissue resulting from heat, chemicals, electricity or sunlight. Burns are often classified as first degree (those causing damage to the outer layer of the skin, the epidermis), second degree (causing deeper damage to the dermis, the layer beneath the epidermis), third degree (those causing the deepest and most severe damage destruction of all layers of the skin and damage to tissues underneath.
[10] The sudden fall of atmospheric pressure indicates –
A.
fair weather
B.
storm
C.
rain
D.
cold weather
Ans:
storm
Explanation :
Atmospheric pressure is basically the weight of air in the atmosphere above the reservoir, so the level of mercury continues to change until the weight of mercury in the glass tube is exactly equal to the weight of air above the reservoir.
[11] The energy emitted by the Sun is due to –
A.
Chemical reaction
B.
Nuclear fission
C.
Nuclear fusion
D.
All of the above
Ans:
Nuclear fusion
Explanation :
The spectrum of the Sun's solar radiation is close to that of a black body with a temperature of about 5,800 K. The Sun emits Electromagnetic radiation across most of the electromagnetic spectrum. Although the Sun produces Gamma rays as a result of the nuclear fusion process, these super high energy photons are converted to lower energy photons before they reach the Sun's surface and are emitted out into space.
[12] The sky appears blue because of –
A.
Atmospheric water vapour
B.
Scattering of light
C.
Reflection on sea water
D.
Emission of blue wavelength by the sun
Ans:
Scattering of light
Explanation :
The sky is blue because the molecules in the air scatter light in the higher wavelengths (that is, the blue light), while lower wavelength light (that is, the light on the red end of the spectrum) goes through to the ground. So the light that get finally reflected down from the scattering is blue, therefore a blue sky. This is called Rayleigh scattering.
[13] The metal whose electrical conductivity is more, is –
A.
copper
B.
aluminium
C.
silver
D.
lead
Ans:
silver
Explanation :
Copper ; 9% less conductive than silver: aluminum is 1 0% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[14] What happens to a liquid, when the vapour pressure equals the atmospheric pressure?
A.
The liquid cools
B.
The liquid boils
C.
No change
D.
The liquid evaporates
Ans:
The liquid boils
Explanation :
Ordinary evaporation is a surface phenomenon -since the vapor pressure is low and since the pressure inside the liquid is equal to atmospheric pressure plus the liquid pressure, bubbles of water vapor cannot form. But at the boiling point, the saturated vapor pressure is equal to atmospheric pressure, bubbles form, and the vaporization becomes a volume phenomena.
[15] Why do brads not have respiratory trouble at the time of flying at high all?
A.
Their lungs are very large
B.
They fly inactively
C.
They have extra air sacs
D.
They use less
Ans:
They have extra air sacs
Explanation :
The avian respiratory system delivers oxygen from the air to the tissues and also removes carbon dioxide. In addition, the respiratory system plays an important role in thermoregulation (maintaining normal body temperature). The avian respiratory system is different from that of other vertebrates, with birds having relatively small lungs plus nine air sacs that play an important role in respiration (but are not directly involved in the exchange of gases).
[16] The temperature which has the same reading on both Fahrenheit and Celsius scales is –
A.
40°
B.
-400
C.
-34°
D.
-1400
Ans:
-400
Explanation :
If C is the temperature in Celsius and F is the temperature in Fahrenheit then, C/S = (F-32)/9. They are equal at -40° (minus 40 degrees), because if we convert the readings of Celsius and Fahrenheit, we will have: Celsius to Fahrenheit (-40°C x 9/5) +32 = -72 + 32 = -40°F. Fahrenheit to Celsius (-40°F - 32°) x 5/9 = (-72) x 5/9 = -40°C.
[17] Kilowatt-hour is the unit of :
A.
Energy
B.
Power
C.
Force
D.
Momentum
Ans:
Energy
Explanation :
The kilowatt hour, or kilowatt-hour, is a unit of energy equal to 1000 watt hours or 3.6 mega-joules For constant power, energy in watt hours is the product of power in watts and time in hours. The kilowatt hour is most commonly known as a billing unit for energy delivered to consumers by electric utilities.
[18] In nuclear reactor, heavy water is used as –
A.
coolant
B.
fuel
C.
moderator
D.
atomic smasher
Ans:
moderator
Explanation :
Heavy water is used in certain types of nuclear reactors where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium-238 which captures neutrons without fissioning. Because they do not require uranium enrichment, heavy water reactors are of concern in regards to nuclear proliferation.
[19] Tear gas used by the police to disperse the mob contains –
A.
carbon dioxide
B.
chlorine
C.
ammonia
D.
hydrogen sulphide
Ans:
chlorine
Explanation :
Tear gas, formally known as a lachrymatory agent, is a possibly lethal chemical weapon that stimulates the corneal nerves in the eyes to cause tears, pain, and even blindness. The compound 2chlorobenzalmalononitrile (chemical formula: C10H5ClN2), is the defining component of a "tear gas" commonly referred to as CS gas, which is used as a riot control agent.
[20] Mist is caused by –
A.
dry ice
B.
ice at low temperature
C.
water vapour at low temperature
D.
carbon-monoxide in solid form
Ans:
water vapour at low temperature
Explanation :
Mist is a phenomenon caused by small droplets of water suspended in air. It can occur as part of natural weather or volcanic activity, and is common in cold air above warmer water, in exhaled air in the cold, and in a steam room of a sauna. It can also be created artificially with aerosol canisters if the humidity conditions are right. The only difference between mist and fog is visibility.
[21] The ozone layer in the atmosphere is at a height of about .
A.
25 km
B.
50 km
C.
100 km
D.
200 km
Ans:
50 km
Explanation :
Ozone is mainly found in two regions of the Earth's atmosphere. Most ozone (about 90%) resides in a layer that begins between 10 to 17 kilometers above the Earth's surface and extends up to about 50 kilometers
[22] The part of the eye having the largest refractive index is :
A.
cornea
B.
aqueous humor
C.
lens
D.
vitreous humor
Ans:
lens
Explanation :
The cornea represents the strongest part of the refracting power of the eye, providing about 80% of the power of the system. The index of refraction of the cornea is about 1.376. Rays pass from the cornea into the watery fluid known as the aqueous humor which has an index of refraction of about 1.336. The lens provides perhaps 20% of the refracting power of the eye with a refractive index of 1.386-1.406. the refractive Index of Vitreous Humor is 1.33.
[23] Conversion of heat into electrical er is achieved by using –
A.
Ammeter
B.
Hydrometer
C.
Voltmeter
D.
Thermocouple
Ans:
Thermocouple
Explanation :
Thermoelectric generators convert thermal energy into electricity by using heat from the body — or any object with a temperature gradient — as their energy source. At the heart of every thermoelectric generator is an array of thermocouples that are responsible for converting thermal energy into electricity. Bismuth telluride and its alloys are commonly used in thermocouples.
[24] The filament of electric bulb is made of -
A.
Iron
B.
Nichrome
C.
Tungsten
D.
Graphite
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[25] Necessary element of change in solar energy to electric energy –
A.
Berilliurn
B.
Silicon
C.
Tantelum
D.
Pure Copper
Ans:
Silicon
Explanation :
A small solar electric or photovoltaic (PV) converts solar energy into electrical energy. Solar cells consist of semiconductor materials which work on photoelectric effect. Silicon remains the most popular material for solar cells.
Explanation :
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities.
[4] If ice floating on water in a vessel melts, the water level in the vessel .
A.
increases
B.
does not change
C.
first increases before decreasing
D.
decreases
Ans:
does not change
Explanation :
When ice floating on water in a vessel melts, the water level in the vessel does not change. This is because when floating, the ice displaces an amount of water equal to its mass, and when melted, it becomes an amount of water equal to its mass.
[5] ATM stands for –
A.
Automatic Teller Machine
B.
Automated Teller Machine
C.
Automatic Tally Machine
D.
Automated Tally Mechanism
Ans:
Automatic Teller Machine
Explanation :
An automated teller machine or automatic teller machine (ATM) is a computerized telecommunications device that provides the clients of a financial institution with access to financial transactions in a public space without the need for a cashier, human clerk or bank teller. ATMs are known by various other names including Arm machine, automated banking machine, "cash dispenser" (Germany) and various regional variants derived from trademarks on ATM systems held by particular banks.
[6] The first synthetic fibre made by man was-
A.
Rayon
B.
Nylon
C.
Polyester
D.
Terycott
Ans:
Nylon
Explanation :
Nylon, the first synthetic fiber in the "fully synthetic" sense of that term, was developed by Wallace Carothers, an American researcher at the chemical firm DuPont in the 1930s.
[7] Compared to fresh Water, the freezing point of sea water is -
A.
Higher
B.
Lower
C.
Same
D.
Depends on the sea from which the water is sourced
Ans:
Lower
Explanation :
Ocean water freezes just like freshwater, but at lower temperatures.
[8] Which colour is the complementary colour of yellow?
A.
Blue
B.
Green
C.
Orange
D.
Red
Ans:
Blue
Explanation :
Complementary colours are pairs of colours that are of "opposite" hue in some colour model. In colour theory, two colours are called complementary if, when mixed in the proper proportion, they produce a neutral colour (grey, white, or black). In roughly-perceptual colour models, the neutral colours (white, grey, and black) lie along a central axis.
[9] Which of the following produces more severe burns?
A.
Boiling water
B.
Hot water
C.
Steam
D.
Melting Iceberg
Ans:
Steam
Explanation :
A burn is an injury to the body's tissue resulting from heat, chemicals, electricity or sunlight. Burns are often classified as first degree (those causing damage to the outer layer of the skin, the epidermis), second degree (causing deeper damage to the dermis, the layer beneath the epidermis), third degree (those causing the deepest and most severe damage destruction of all layers of the skin and damage to tissues underneath.
[10] The sudden fall of atmospheric pressure indicates –
A.
fair weather
B.
storm
C.
rain
D.
cold weather
Ans:
storm
Explanation :
Atmospheric pressure is basically the weight of air in the atmosphere above the reservoir, so the level of mercury continues to change until the weight of mercury in the glass tube is exactly equal to the weight of air above the reservoir.
[11] The energy emitted by the Sun is due to –
A.
Chemical reaction
B.
Nuclear fission
C.
Nuclear fusion
D.
All of the above
Ans:
Nuclear fusion
Explanation :
The spectrum of the Sun's solar radiation is close to that of a black body with a temperature of about 5,800 K. The Sun emits Electromagnetic radiation across most of the electromagnetic spectrum. Although the Sun produces Gamma rays as a result of the nuclear fusion process, these super high energy photons are converted to lower energy photons before they reach the Sun's surface and are emitted out into space.
[12] The sky appears blue because of –
A.
Atmospheric water vapour
B.
Scattering of light
C.
Reflection on sea water
D.
Emission of blue wavelength by the sun
Ans:
Scattering of light
Explanation :
The sky is blue because the molecules in the air scatter light in the higher wavelengths (that is, the blue light), while lower wavelength light (that is, the light on the red end of the spectrum) goes through to the ground. So the light that get finally reflected down from the scattering is blue, therefore a blue sky. This is called Rayleigh scattering.
[13] The metal whose electrical conductivity is more, is –
A.
copper
B.
aluminium
C.
silver
D.
lead
Ans:
silver
Explanation :
Copper ; 9% less conductive than silver: aluminum is 1 0% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[14] What happens to a liquid, when the vapour pressure equals the atmospheric pressure?
A.
The liquid cools
B.
The liquid boils
C.
No change
D.
The liquid evaporates
Ans:
The liquid boils
Explanation :
Ordinary evaporation is a surface phenomenon -since the vapor pressure is low and since the pressure inside the liquid is equal to atmospheric pressure plus the liquid pressure, bubbles of water vapor cannot form. But at the boiling point, the saturated vapor pressure is equal to atmospheric pressure, bubbles form, and the vaporization becomes a volume phenomena.
[15] Why do brads not have respiratory trouble at the time of flying at high all?
A.
Their lungs are very large
B.
They fly inactively
C.
They have extra air sacs
D.
They use less
Ans:
They have extra air sacs
Explanation :
The avian respiratory system delivers oxygen from the air to the tissues and also removes carbon dioxide. In addition, the respiratory system plays an important role in thermoregulation (maintaining normal body temperature). The avian respiratory system is different from that of other vertebrates, with birds having relatively small lungs plus nine air sacs that play an important role in respiration (but are not directly involved in the exchange of gases).
[16] The temperature which has the same reading on both Fahrenheit and Celsius scales is –
A.
40°
B.
-400
C.
-34°
D.
-1400
Ans:
-400
Explanation :
If C is the temperature in Celsius and F is the temperature in Fahrenheit then, C/S = (F-32)/9. They are equal at -40° (minus 40 degrees), because if we convert the readings of Celsius and Fahrenheit, we will have: Celsius to Fahrenheit (-40°C x 9/5) +32 = -72 + 32 = -40°F. Fahrenheit to Celsius (-40°F - 32°) x 5/9 = (-72) x 5/9 = -40°C.
[17] Kilowatt-hour is the unit of :
A.
Energy
B.
Power
C.
Force
D.
Momentum
Ans:
Energy
Explanation :
The kilowatt hour, or kilowatt-hour, is a unit of energy equal to 1000 watt hours or 3.6 mega-joules For constant power, energy in watt hours is the product of power in watts and time in hours. The kilowatt hour is most commonly known as a billing unit for energy delivered to consumers by electric utilities.
[18] In nuclear reactor, heavy water is used as –
A.
coolant
B.
fuel
C.
moderator
D.
atomic smasher
Ans:
moderator
Explanation :
Heavy water is used in certain types of nuclear reactors where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium-238 which captures neutrons without fissioning. Because they do not require uranium enrichment, heavy water reactors are of concern in regards to nuclear proliferation.
[19] Tear gas used by the police to disperse the mob contains –
A.
carbon dioxide
B.
chlorine
C.
ammonia
D.
hydrogen sulphide
Ans:
chlorine
Explanation :
Tear gas, formally known as a lachrymatory agent, is a possibly lethal chemical weapon that stimulates the corneal nerves in the eyes to cause tears, pain, and even blindness. The compound 2chlorobenzalmalononitrile (chemical formula: C10H5ClN2), is the defining component of a "tear gas" commonly referred to as CS gas, which is used as a riot control agent.
[20] Mist is caused by –
A.
dry ice
B.
ice at low temperature
C.
water vapour at low temperature
D.
carbon-monoxide in solid form
Ans:
water vapour at low temperature
Explanation :
Mist is a phenomenon caused by small droplets of water suspended in air. It can occur as part of natural weather or volcanic activity, and is common in cold air above warmer water, in exhaled air in the cold, and in a steam room of a sauna. It can also be created artificially with aerosol canisters if the humidity conditions are right. The only difference between mist and fog is visibility.
[21] The ozone layer in the atmosphere is at a height of about .
A.
25 km
B.
50 km
C.
100 km
D.
200 km
Ans:
50 km
Explanation :
Ozone is mainly found in two regions of the Earth's atmosphere. Most ozone (about 90%) resides in a layer that begins between 10 to 17 kilometers above the Earth's surface and extends up to about 50 kilometers
[22] The part of the eye having the largest refractive index is :
A.
cornea
B.
aqueous humor
C.
lens
D.
vitreous humor
Ans:
lens
Explanation :
The cornea represents the strongest part of the refracting power of the eye, providing about 80% of the power of the system. The index of refraction of the cornea is about 1.376. Rays pass from the cornea into the watery fluid known as the aqueous humor which has an index of refraction of about 1.336. The lens provides perhaps 20% of the refracting power of the eye with a refractive index of 1.386-1.406. the refractive Index of Vitreous Humor is 1.33.
[23] Conversion of heat into electrical er is achieved by using –
A.
Ammeter
B.
Hydrometer
C.
Voltmeter
D.
Thermocouple
Ans:
Thermocouple
Explanation :
Thermoelectric generators convert thermal energy into electricity by using heat from the body — or any object with a temperature gradient — as their energy source. At the heart of every thermoelectric generator is an array of thermocouples that are responsible for converting thermal energy into electricity. Bismuth telluride and its alloys are commonly used in thermocouples.
[24] The filament of electric bulb is made of -
A.
Iron
B.
Nichrome
C.
Tungsten
D.
Graphite
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[25] Necessary element of change in solar energy to electric energy –
A.
Berilliurn
B.
Silicon
C.
Tantelum
D.
Pure Copper
Ans:
Silicon
Explanation :
A small solar electric or photovoltaic (PV) converts solar energy into electrical energy. Solar cells consist of semiconductor materials which work on photoelectric effect. Silicon remains the most popular material for solar cells.
Explanation :
An automated teller machine or automatic teller machine (ATM) is a computerized telecommunications device that provides the clients of a financial institution with access to financial transactions in a public space without the need for a cashier, human clerk or bank teller. ATMs are known by various other names including Arm machine, automated banking machine, "cash dispenser" (Germany) and various regional variants derived from trademarks on ATM systems held by particular banks.
[6] The first synthetic fibre made by man was-
A.
Rayon
B.
Nylon
C.
Polyester
D.
Terycott
Ans:
Nylon
Explanation :
Nylon, the first synthetic fiber in the "fully synthetic" sense of that term, was developed by Wallace Carothers, an American researcher at the chemical firm DuPont in the 1930s.
[7] Compared to fresh Water, the freezing point of sea water is -
A.
Higher
B.
Lower
C.
Same
D.
Depends on the sea from which the water is sourced
Ans:
Lower
Explanation :
Ocean water freezes just like freshwater, but at lower temperatures.
[8] Which colour is the complementary colour of yellow?
A.
Blue
B.
Green
C.
Orange
D.
Red
Ans:
Blue
Explanation :
Complementary colours are pairs of colours that are of "opposite" hue in some colour model. In colour theory, two colours are called complementary if, when mixed in the proper proportion, they produce a neutral colour (grey, white, or black). In roughly-perceptual colour models, the neutral colours (white, grey, and black) lie along a central axis.
[9] Which of the following produces more severe burns?
A.
Boiling water
B.
Hot water
C.
Steam
D.
Melting Iceberg
Ans:
Steam
Explanation :
A burn is an injury to the body's tissue resulting from heat, chemicals, electricity or sunlight. Burns are often classified as first degree (those causing damage to the outer layer of the skin, the epidermis), second degree (causing deeper damage to the dermis, the layer beneath the epidermis), third degree (those causing the deepest and most severe damage destruction of all layers of the skin and damage to tissues underneath.
[10] The sudden fall of atmospheric pressure indicates –
A.
fair weather
B.
storm
C.
rain
D.
cold weather
Ans:
storm
Explanation :
Atmospheric pressure is basically the weight of air in the atmosphere above the reservoir, so the level of mercury continues to change until the weight of mercury in the glass tube is exactly equal to the weight of air above the reservoir.
[11] The energy emitted by the Sun is due to –
A.
Chemical reaction
B.
Nuclear fission
C.
Nuclear fusion
D.
All of the above
Ans:
Nuclear fusion
Explanation :
The spectrum of the Sun's solar radiation is close to that of a black body with a temperature of about 5,800 K. The Sun emits Electromagnetic radiation across most of the electromagnetic spectrum. Although the Sun produces Gamma rays as a result of the nuclear fusion process, these super high energy photons are converted to lower energy photons before they reach the Sun's surface and are emitted out into space.
[12] The sky appears blue because of –
A.
Atmospheric water vapour
B.
Scattering of light
C.
Reflection on sea water
D.
Emission of blue wavelength by the sun
Ans:
Scattering of light
Explanation :
The sky is blue because the molecules in the air scatter light in the higher wavelengths (that is, the blue light), while lower wavelength light (that is, the light on the red end of the spectrum) goes through to the ground. So the light that get finally reflected down from the scattering is blue, therefore a blue sky. This is called Rayleigh scattering.
[13] The metal whose electrical conductivity is more, is –
A.
copper
B.
aluminium
C.
silver
D.
lead
Ans:
silver
Explanation :
Copper ; 9% less conductive than silver: aluminum is 1 0% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[14] What happens to a liquid, when the vapour pressure equals the atmospheric pressure?
A.
The liquid cools
B.
The liquid boils
C.
No change
D.
The liquid evaporates
Ans:
The liquid boils
Explanation :
Ordinary evaporation is a surface phenomenon -since the vapor pressure is low and since the pressure inside the liquid is equal to atmospheric pressure plus the liquid pressure, bubbles of water vapor cannot form. But at the boiling point, the saturated vapor pressure is equal to atmospheric pressure, bubbles form, and the vaporization becomes a volume phenomena.
[15] Why do brads not have respiratory trouble at the time of flying at high all?
A.
Their lungs are very large
B.
They fly inactively
C.
They have extra air sacs
D.
They use less
Ans:
They have extra air sacs
Explanation :
The avian respiratory system delivers oxygen from the air to the tissues and also removes carbon dioxide. In addition, the respiratory system plays an important role in thermoregulation (maintaining normal body temperature). The avian respiratory system is different from that of other vertebrates, with birds having relatively small lungs plus nine air sacs that play an important role in respiration (but are not directly involved in the exchange of gases).
[16] The temperature which has the same reading on both Fahrenheit and Celsius scales is –
A.
40°
B.
-400
C.
-34°
D.
-1400
Ans:
-400
Explanation :
If C is the temperature in Celsius and F is the temperature in Fahrenheit then, C/S = (F-32)/9. They are equal at -40° (minus 40 degrees), because if we convert the readings of Celsius and Fahrenheit, we will have: Celsius to Fahrenheit (-40°C x 9/5) +32 = -72 + 32 = -40°F. Fahrenheit to Celsius (-40°F - 32°) x 5/9 = (-72) x 5/9 = -40°C.
[17] Kilowatt-hour is the unit of :
A.
Energy
B.
Power
C.
Force
D.
Momentum
Ans:
Energy
Explanation :
The kilowatt hour, or kilowatt-hour, is a unit of energy equal to 1000 watt hours or 3.6 mega-joules For constant power, energy in watt hours is the product of power in watts and time in hours. The kilowatt hour is most commonly known as a billing unit for energy delivered to consumers by electric utilities.
[18] In nuclear reactor, heavy water is used as –
A.
coolant
B.
fuel
C.
moderator
D.
atomic smasher
Ans:
moderator
Explanation :
Heavy water is used in certain types of nuclear reactors where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium-238 which captures neutrons without fissioning. Because they do not require uranium enrichment, heavy water reactors are of concern in regards to nuclear proliferation.
[19] Tear gas used by the police to disperse the mob contains –
A.
carbon dioxide
B.
chlorine
C.
ammonia
D.
hydrogen sulphide
Ans:
chlorine
Explanation :
Tear gas, formally known as a lachrymatory agent, is a possibly lethal chemical weapon that stimulates the corneal nerves in the eyes to cause tears, pain, and even blindness. The compound 2chlorobenzalmalononitrile (chemical formula: C10H5ClN2), is the defining component of a "tear gas" commonly referred to as CS gas, which is used as a riot control agent.
[20] Mist is caused by –
A.
dry ice
B.
ice at low temperature
C.
water vapour at low temperature
D.
carbon-monoxide in solid form
Ans:
water vapour at low temperature
Explanation :
Mist is a phenomenon caused by small droplets of water suspended in air. It can occur as part of natural weather or volcanic activity, and is common in cold air above warmer water, in exhaled air in the cold, and in a steam room of a sauna. It can also be created artificially with aerosol canisters if the humidity conditions are right. The only difference between mist and fog is visibility.
[21] The ozone layer in the atmosphere is at a height of about .
A.
25 km
B.
50 km
C.
100 km
D.
200 km
Ans:
50 km
Explanation :
Ozone is mainly found in two regions of the Earth's atmosphere. Most ozone (about 90%) resides in a layer that begins between 10 to 17 kilometers above the Earth's surface and extends up to about 50 kilometers
[22] The part of the eye having the largest refractive index is :
A.
cornea
B.
aqueous humor
C.
lens
D.
vitreous humor
Ans:
lens
Explanation :
The cornea represents the strongest part of the refracting power of the eye, providing about 80% of the power of the system. The index of refraction of the cornea is about 1.376. Rays pass from the cornea into the watery fluid known as the aqueous humor which has an index of refraction of about 1.336. The lens provides perhaps 20% of the refracting power of the eye with a refractive index of 1.386-1.406. the refractive Index of Vitreous Humor is 1.33.
[23] Conversion of heat into electrical er is achieved by using –
A.
Ammeter
B.
Hydrometer
C.
Voltmeter
D.
Thermocouple
Ans:
Thermocouple
Explanation :
Thermoelectric generators convert thermal energy into electricity by using heat from the body — or any object with a temperature gradient — as their energy source. At the heart of every thermoelectric generator is an array of thermocouples that are responsible for converting thermal energy into electricity. Bismuth telluride and its alloys are commonly used in thermocouples.
[24] The filament of electric bulb is made of -
A.
Iron
B.
Nichrome
C.
Tungsten
D.
Graphite
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[25] Necessary element of change in solar energy to electric energy –
A.
Berilliurn
B.
Silicon
C.
Tantelum
D.
Pure Copper
Ans:
Silicon
Explanation :
A small solar electric or photovoltaic (PV) converts solar energy into electrical energy. Solar cells consist of semiconductor materials which work on photoelectric effect. Silicon remains the most popular material for solar cells.
Explanation :
Ocean water freezes just like freshwater, but at lower temperatures.
[8] Which colour is the complementary colour of yellow?
A.
Blue
B.
Green
C.
Orange
D.
Red
Ans:
Blue
Explanation :
Complementary colours are pairs of colours that are of "opposite" hue in some colour model. In colour theory, two colours are called complementary if, when mixed in the proper proportion, they produce a neutral colour (grey, white, or black). In roughly-perceptual colour models, the neutral colours (white, grey, and black) lie along a central axis.
[9] Which of the following produces more severe burns?
A.
Boiling water
B.
Hot water
C.
Steam
D.
Melting Iceberg
Ans:
Steam
Explanation :
A burn is an injury to the body's tissue resulting from heat, chemicals, electricity or sunlight. Burns are often classified as first degree (those causing damage to the outer layer of the skin, the epidermis), second degree (causing deeper damage to the dermis, the layer beneath the epidermis), third degree (those causing the deepest and most severe damage destruction of all layers of the skin and damage to tissues underneath.
[10] The sudden fall of atmospheric pressure indicates –
A.
fair weather
B.
storm
C.
rain
D.
cold weather
Ans:
storm
Explanation :
Atmospheric pressure is basically the weight of air in the atmosphere above the reservoir, so the level of mercury continues to change until the weight of mercury in the glass tube is exactly equal to the weight of air above the reservoir.
[11] The energy emitted by the Sun is due to –
A.
Chemical reaction
B.
Nuclear fission
C.
Nuclear fusion
D.
All of the above
Ans:
Nuclear fusion
Explanation :
The spectrum of the Sun's solar radiation is close to that of a black body with a temperature of about 5,800 K. The Sun emits Electromagnetic radiation across most of the electromagnetic spectrum. Although the Sun produces Gamma rays as a result of the nuclear fusion process, these super high energy photons are converted to lower energy photons before they reach the Sun's surface and are emitted out into space.
[12] The sky appears blue because of –
A.
Atmospheric water vapour
B.
Scattering of light
C.
Reflection on sea water
D.
Emission of blue wavelength by the sun
Ans:
Scattering of light
Explanation :
The sky is blue because the molecules in the air scatter light in the higher wavelengths (that is, the blue light), while lower wavelength light (that is, the light on the red end of the spectrum) goes through to the ground. So the light that get finally reflected down from the scattering is blue, therefore a blue sky. This is called Rayleigh scattering.
[13] The metal whose electrical conductivity is more, is –
A.
copper
B.
aluminium
C.
silver
D.
lead
Ans:
silver
Explanation :
Copper ; 9% less conductive than silver: aluminum is 1 0% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[14] What happens to a liquid, when the vapour pressure equals the atmospheric pressure?
A.
The liquid cools
B.
The liquid boils
C.
No change
D.
The liquid evaporates
Ans:
The liquid boils
Explanation :
Ordinary evaporation is a surface phenomenon -since the vapor pressure is low and since the pressure inside the liquid is equal to atmospheric pressure plus the liquid pressure, bubbles of water vapor cannot form. But at the boiling point, the saturated vapor pressure is equal to atmospheric pressure, bubbles form, and the vaporization becomes a volume phenomena.
[15] Why do brads not have respiratory trouble at the time of flying at high all?
A.
Their lungs are very large
B.
They fly inactively
C.
They have extra air sacs
D.
They use less
Ans:
They have extra air sacs
Explanation :
The avian respiratory system delivers oxygen from the air to the tissues and also removes carbon dioxide. In addition, the respiratory system plays an important role in thermoregulation (maintaining normal body temperature). The avian respiratory system is different from that of other vertebrates, with birds having relatively small lungs plus nine air sacs that play an important role in respiration (but are not directly involved in the exchange of gases).
[16] The temperature which has the same reading on both Fahrenheit and Celsius scales is –
A.
40°
B.
-400
C.
-34°
D.
-1400
Ans:
-400
Explanation :
If C is the temperature in Celsius and F is the temperature in Fahrenheit then, C/S = (F-32)/9. They are equal at -40° (minus 40 degrees), because if we convert the readings of Celsius and Fahrenheit, we will have: Celsius to Fahrenheit (-40°C x 9/5) +32 = -72 + 32 = -40°F. Fahrenheit to Celsius (-40°F - 32°) x 5/9 = (-72) x 5/9 = -40°C.
[17] Kilowatt-hour is the unit of :
A.
Energy
B.
Power
C.
Force
D.
Momentum
Ans:
Energy
Explanation :
The kilowatt hour, or kilowatt-hour, is a unit of energy equal to 1000 watt hours or 3.6 mega-joules For constant power, energy in watt hours is the product of power in watts and time in hours. The kilowatt hour is most commonly known as a billing unit for energy delivered to consumers by electric utilities.
[18] In nuclear reactor, heavy water is used as –
A.
coolant
B.
fuel
C.
moderator
D.
atomic smasher
Ans:
moderator
Explanation :
Heavy water is used in certain types of nuclear reactors where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium-238 which captures neutrons without fissioning. Because they do not require uranium enrichment, heavy water reactors are of concern in regards to nuclear proliferation.
[19] Tear gas used by the police to disperse the mob contains –
A.
carbon dioxide
B.
chlorine
C.
ammonia
D.
hydrogen sulphide
Ans:
chlorine
Explanation :
Tear gas, formally known as a lachrymatory agent, is a possibly lethal chemical weapon that stimulates the corneal nerves in the eyes to cause tears, pain, and even blindness. The compound 2chlorobenzalmalononitrile (chemical formula: C10H5ClN2), is the defining component of a "tear gas" commonly referred to as CS gas, which is used as a riot control agent.
[20] Mist is caused by –
A.
dry ice
B.
ice at low temperature
C.
water vapour at low temperature
D.
carbon-monoxide in solid form
Ans:
water vapour at low temperature
Explanation :
Mist is a phenomenon caused by small droplets of water suspended in air. It can occur as part of natural weather or volcanic activity, and is common in cold air above warmer water, in exhaled air in the cold, and in a steam room of a sauna. It can also be created artificially with aerosol canisters if the humidity conditions are right. The only difference between mist and fog is visibility.
[21] The ozone layer in the atmosphere is at a height of about .
A.
25 km
B.
50 km
C.
100 km
D.
200 km
Ans:
50 km
Explanation :
Ozone is mainly found in two regions of the Earth's atmosphere. Most ozone (about 90%) resides in a layer that begins between 10 to 17 kilometers above the Earth's surface and extends up to about 50 kilometers
[22] The part of the eye having the largest refractive index is :
A.
cornea
B.
aqueous humor
C.
lens
D.
vitreous humor
Ans:
lens
Explanation :
The cornea represents the strongest part of the refracting power of the eye, providing about 80% of the power of the system. The index of refraction of the cornea is about 1.376. Rays pass from the cornea into the watery fluid known as the aqueous humor which has an index of refraction of about 1.336. The lens provides perhaps 20% of the refracting power of the eye with a refractive index of 1.386-1.406. the refractive Index of Vitreous Humor is 1.33.
[23] Conversion of heat into electrical er is achieved by using –
A.
Ammeter
B.
Hydrometer
C.
Voltmeter
D.
Thermocouple
Ans:
Thermocouple
Explanation :
Thermoelectric generators convert thermal energy into electricity by using heat from the body — or any object with a temperature gradient — as their energy source. At the heart of every thermoelectric generator is an array of thermocouples that are responsible for converting thermal energy into electricity. Bismuth telluride and its alloys are commonly used in thermocouples.
[24] The filament of electric bulb is made of -
A.
Iron
B.
Nichrome
C.
Tungsten
D.
Graphite
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[25] Necessary element of change in solar energy to electric energy –
A.
Berilliurn
B.
Silicon
C.
Tantelum
D.
Pure Copper
Ans:
Silicon
Explanation :
A small solar electric or photovoltaic (PV) converts solar energy into electrical energy. Solar cells consist of semiconductor materials which work on photoelectric effect. Silicon remains the most popular material for solar cells.
Explanation :
A burn is an injury to the body's tissue resulting from heat, chemicals, electricity or sunlight. Burns are often classified as first degree (those causing damage to the outer layer of the skin, the epidermis), second degree (causing deeper damage to the dermis, the layer beneath the epidermis), third degree (those causing the deepest and most severe damage destruction of all layers of the skin and damage to tissues underneath.
[10] The sudden fall of atmospheric pressure indicates –
A.
fair weather
B.
storm
C.
rain
D.
cold weather
Ans:
storm
Explanation :
Atmospheric pressure is basically the weight of air in the atmosphere above the reservoir, so the level of mercury continues to change until the weight of mercury in the glass tube is exactly equal to the weight of air above the reservoir.
[11] The energy emitted by the Sun is due to –
A.
Chemical reaction
B.
Nuclear fission
C.
Nuclear fusion
D.
All of the above
Ans:
Nuclear fusion
Explanation :
The spectrum of the Sun's solar radiation is close to that of a black body with a temperature of about 5,800 K. The Sun emits Electromagnetic radiation across most of the electromagnetic spectrum. Although the Sun produces Gamma rays as a result of the nuclear fusion process, these super high energy photons are converted to lower energy photons before they reach the Sun's surface and are emitted out into space.
[12] The sky appears blue because of –
A.
Atmospheric water vapour
B.
Scattering of light
C.
Reflection on sea water
D.
Emission of blue wavelength by the sun
Ans:
Scattering of light
Explanation :
The sky is blue because the molecules in the air scatter light in the higher wavelengths (that is, the blue light), while lower wavelength light (that is, the light on the red end of the spectrum) goes through to the ground. So the light that get finally reflected down from the scattering is blue, therefore a blue sky. This is called Rayleigh scattering.
[13] The metal whose electrical conductivity is more, is –
A.
copper
B.
aluminium
C.
silver
D.
lead
Ans:
silver
Explanation :
Copper ; 9% less conductive than silver: aluminum is 1 0% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[14] What happens to a liquid, when the vapour pressure equals the atmospheric pressure?
A.
The liquid cools
B.
The liquid boils
C.
No change
D.
The liquid evaporates
Ans:
The liquid boils
Explanation :
Ordinary evaporation is a surface phenomenon -since the vapor pressure is low and since the pressure inside the liquid is equal to atmospheric pressure plus the liquid pressure, bubbles of water vapor cannot form. But at the boiling point, the saturated vapor pressure is equal to atmospheric pressure, bubbles form, and the vaporization becomes a volume phenomena.
[15] Why do brads not have respiratory trouble at the time of flying at high all?
A.
Their lungs are very large
B.
They fly inactively
C.
They have extra air sacs
D.
They use less
Ans:
They have extra air sacs
Explanation :
The avian respiratory system delivers oxygen from the air to the tissues and also removes carbon dioxide. In addition, the respiratory system plays an important role in thermoregulation (maintaining normal body temperature). The avian respiratory system is different from that of other vertebrates, with birds having relatively small lungs plus nine air sacs that play an important role in respiration (but are not directly involved in the exchange of gases).
[16] The temperature which has the same reading on both Fahrenheit and Celsius scales is –
A.
40°
B.
-400
C.
-34°
D.
-1400
Ans:
-400
Explanation :
If C is the temperature in Celsius and F is the temperature in Fahrenheit then, C/S = (F-32)/9. They are equal at -40° (minus 40 degrees), because if we convert the readings of Celsius and Fahrenheit, we will have: Celsius to Fahrenheit (-40°C x 9/5) +32 = -72 + 32 = -40°F. Fahrenheit to Celsius (-40°F - 32°) x 5/9 = (-72) x 5/9 = -40°C.
[17] Kilowatt-hour is the unit of :
A.
Energy
B.
Power
C.
Force
D.
Momentum
Ans:
Energy
Explanation :
The kilowatt hour, or kilowatt-hour, is a unit of energy equal to 1000 watt hours or 3.6 mega-joules For constant power, energy in watt hours is the product of power in watts and time in hours. The kilowatt hour is most commonly known as a billing unit for energy delivered to consumers by electric utilities.
[18] In nuclear reactor, heavy water is used as –
A.
coolant
B.
fuel
C.
moderator
D.
atomic smasher
Ans:
moderator
Explanation :
Heavy water is used in certain types of nuclear reactors where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium-238 which captures neutrons without fissioning. Because they do not require uranium enrichment, heavy water reactors are of concern in regards to nuclear proliferation.
[19] Tear gas used by the police to disperse the mob contains –
A.
carbon dioxide
B.
chlorine
C.
ammonia
D.
hydrogen sulphide
Ans:
chlorine
Explanation :
Tear gas, formally known as a lachrymatory agent, is a possibly lethal chemical weapon that stimulates the corneal nerves in the eyes to cause tears, pain, and even blindness. The compound 2chlorobenzalmalononitrile (chemical formula: C10H5ClN2), is the defining component of a "tear gas" commonly referred to as CS gas, which is used as a riot control agent.
[20] Mist is caused by –
A.
dry ice
B.
ice at low temperature
C.
water vapour at low temperature
D.
carbon-monoxide in solid form
Ans:
water vapour at low temperature
Explanation :
Mist is a phenomenon caused by small droplets of water suspended in air. It can occur as part of natural weather or volcanic activity, and is common in cold air above warmer water, in exhaled air in the cold, and in a steam room of a sauna. It can also be created artificially with aerosol canisters if the humidity conditions are right. The only difference between mist and fog is visibility.
[21] The ozone layer in the atmosphere is at a height of about .
A.
25 km
B.
50 km
C.
100 km
D.
200 km
Ans:
50 km
Explanation :
Ozone is mainly found in two regions of the Earth's atmosphere. Most ozone (about 90%) resides in a layer that begins between 10 to 17 kilometers above the Earth's surface and extends up to about 50 kilometers
[22] The part of the eye having the largest refractive index is :
A.
cornea
B.
aqueous humor
C.
lens
D.
vitreous humor
Ans:
lens
Explanation :
The cornea represents the strongest part of the refracting power of the eye, providing about 80% of the power of the system. The index of refraction of the cornea is about 1.376. Rays pass from the cornea into the watery fluid known as the aqueous humor which has an index of refraction of about 1.336. The lens provides perhaps 20% of the refracting power of the eye with a refractive index of 1.386-1.406. the refractive Index of Vitreous Humor is 1.33.
[23] Conversion of heat into electrical er is achieved by using –
A.
Ammeter
B.
Hydrometer
C.
Voltmeter
D.
Thermocouple
Ans:
Thermocouple
Explanation :
Thermoelectric generators convert thermal energy into electricity by using heat from the body — or any object with a temperature gradient — as their energy source. At the heart of every thermoelectric generator is an array of thermocouples that are responsible for converting thermal energy into electricity. Bismuth telluride and its alloys are commonly used in thermocouples.
[24] The filament of electric bulb is made of -
A.
Iron
B.
Nichrome
C.
Tungsten
D.
Graphite
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[25] Necessary element of change in solar energy to electric energy –
A.
Berilliurn
B.
Silicon
C.
Tantelum
D.
Pure Copper
Ans:
Silicon
Explanation :
A small solar electric or photovoltaic (PV) converts solar energy into electrical energy. Solar cells consist of semiconductor materials which work on photoelectric effect. Silicon remains the most popular material for solar cells.
Explanation :
The spectrum of the Sun's solar radiation is close to that of a black body with a temperature of about 5,800 K. The Sun emits Electromagnetic radiation across most of the electromagnetic spectrum. Although the Sun produces Gamma rays as a result of the nuclear fusion process, these super high energy photons are converted to lower energy photons before they reach the Sun's surface and are emitted out into space.
[12] The sky appears blue because of –
A.
Atmospheric water vapour
B.
Scattering of light
C.
Reflection on sea water
D.
Emission of blue wavelength by the sun
Ans:
Scattering of light
Explanation :
The sky is blue because the molecules in the air scatter light in the higher wavelengths (that is, the blue light), while lower wavelength light (that is, the light on the red end of the spectrum) goes through to the ground. So the light that get finally reflected down from the scattering is blue, therefore a blue sky. This is called Rayleigh scattering.
[13] The metal whose electrical conductivity is more, is –
A.
copper
B.
aluminium
C.
silver
D.
lead
Ans:
silver
Explanation :
Copper ; 9% less conductive than silver: aluminum is 1 0% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[14] What happens to a liquid, when the vapour pressure equals the atmospheric pressure?
A.
The liquid cools
B.
The liquid boils
C.
No change
D.
The liquid evaporates
Ans:
The liquid boils
Explanation :
Ordinary evaporation is a surface phenomenon -since the vapor pressure is low and since the pressure inside the liquid is equal to atmospheric pressure plus the liquid pressure, bubbles of water vapor cannot form. But at the boiling point, the saturated vapor pressure is equal to atmospheric pressure, bubbles form, and the vaporization becomes a volume phenomena.
[15] Why do brads not have respiratory trouble at the time of flying at high all?
A.
Their lungs are very large
B.
They fly inactively
C.
They have extra air sacs
D.
They use less
Ans:
They have extra air sacs
Explanation :
The avian respiratory system delivers oxygen from the air to the tissues and also removes carbon dioxide. In addition, the respiratory system plays an important role in thermoregulation (maintaining normal body temperature). The avian respiratory system is different from that of other vertebrates, with birds having relatively small lungs plus nine air sacs that play an important role in respiration (but are not directly involved in the exchange of gases).
[16] The temperature which has the same reading on both Fahrenheit and Celsius scales is –
A.
40°
B.
-400
C.
-34°
D.
-1400
Ans:
-400
Explanation :
If C is the temperature in Celsius and F is the temperature in Fahrenheit then, C/S = (F-32)/9. They are equal at -40° (minus 40 degrees), because if we convert the readings of Celsius and Fahrenheit, we will have: Celsius to Fahrenheit (-40°C x 9/5) +32 = -72 + 32 = -40°F. Fahrenheit to Celsius (-40°F - 32°) x 5/9 = (-72) x 5/9 = -40°C.
[17] Kilowatt-hour is the unit of :
A.
Energy
B.
Power
C.
Force
D.
Momentum
Ans:
Energy
Explanation :
The kilowatt hour, or kilowatt-hour, is a unit of energy equal to 1000 watt hours or 3.6 mega-joules For constant power, energy in watt hours is the product of power in watts and time in hours. The kilowatt hour is most commonly known as a billing unit for energy delivered to consumers by electric utilities.
[18] In nuclear reactor, heavy water is used as –
A.
coolant
B.
fuel
C.
moderator
D.
atomic smasher
Ans:
moderator
Explanation :
Heavy water is used in certain types of nuclear reactors where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium-238 which captures neutrons without fissioning. Because they do not require uranium enrichment, heavy water reactors are of concern in regards to nuclear proliferation.
[19] Tear gas used by the police to disperse the mob contains –
A.
carbon dioxide
B.
chlorine
C.
ammonia
D.
hydrogen sulphide
Ans:
chlorine
Explanation :
Tear gas, formally known as a lachrymatory agent, is a possibly lethal chemical weapon that stimulates the corneal nerves in the eyes to cause tears, pain, and even blindness. The compound 2chlorobenzalmalononitrile (chemical formula: C10H5ClN2), is the defining component of a "tear gas" commonly referred to as CS gas, which is used as a riot control agent.
[20] Mist is caused by –
A.
dry ice
B.
ice at low temperature
C.
water vapour at low temperature
D.
carbon-monoxide in solid form
Ans:
water vapour at low temperature
Explanation :
Mist is a phenomenon caused by small droplets of water suspended in air. It can occur as part of natural weather or volcanic activity, and is common in cold air above warmer water, in exhaled air in the cold, and in a steam room of a sauna. It can also be created artificially with aerosol canisters if the humidity conditions are right. The only difference between mist and fog is visibility.
[21] The ozone layer in the atmosphere is at a height of about .
A.
25 km
B.
50 km
C.
100 km
D.
200 km
Ans:
50 km
Explanation :
Ozone is mainly found in two regions of the Earth's atmosphere. Most ozone (about 90%) resides in a layer that begins between 10 to 17 kilometers above the Earth's surface and extends up to about 50 kilometers
[22] The part of the eye having the largest refractive index is :
A.
cornea
B.
aqueous humor
C.
lens
D.
vitreous humor
Ans:
lens
Explanation :
The cornea represents the strongest part of the refracting power of the eye, providing about 80% of the power of the system. The index of refraction of the cornea is about 1.376. Rays pass from the cornea into the watery fluid known as the aqueous humor which has an index of refraction of about 1.336. The lens provides perhaps 20% of the refracting power of the eye with a refractive index of 1.386-1.406. the refractive Index of Vitreous Humor is 1.33.
[23] Conversion of heat into electrical er is achieved by using –
A.
Ammeter
B.
Hydrometer
C.
Voltmeter
D.
Thermocouple
Ans:
Thermocouple
Explanation :
Thermoelectric generators convert thermal energy into electricity by using heat from the body — or any object with a temperature gradient — as their energy source. At the heart of every thermoelectric generator is an array of thermocouples that are responsible for converting thermal energy into electricity. Bismuth telluride and its alloys are commonly used in thermocouples.
[24] The filament of electric bulb is made of -
A.
Iron
B.
Nichrome
C.
Tungsten
D.
Graphite
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[25] Necessary element of change in solar energy to electric energy –
A.
Berilliurn
B.
Silicon
C.
Tantelum
D.
Pure Copper
Ans:
Silicon
Explanation :
A small solar electric or photovoltaic (PV) converts solar energy into electrical energy. Solar cells consist of semiconductor materials which work on photoelectric effect. Silicon remains the most popular material for solar cells.
Explanation :
Copper ; 9% less conductive than silver: aluminum is 1 0% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[14] What happens to a liquid, when the vapour pressure equals the atmospheric pressure?
A.
The liquid cools
B.
The liquid boils
C.
No change
D.
The liquid evaporates
Ans:
The liquid boils
Explanation :
Ordinary evaporation is a surface phenomenon -since the vapor pressure is low and since the pressure inside the liquid is equal to atmospheric pressure plus the liquid pressure, bubbles of water vapor cannot form. But at the boiling point, the saturated vapor pressure is equal to atmospheric pressure, bubbles form, and the vaporization becomes a volume phenomena.
[15] Why do brads not have respiratory trouble at the time of flying at high all?
A.
Their lungs are very large
B.
They fly inactively
C.
They have extra air sacs
D.
They use less
Ans:
They have extra air sacs
Explanation :
The avian respiratory system delivers oxygen from the air to the tissues and also removes carbon dioxide. In addition, the respiratory system plays an important role in thermoregulation (maintaining normal body temperature). The avian respiratory system is different from that of other vertebrates, with birds having relatively small lungs plus nine air sacs that play an important role in respiration (but are not directly involved in the exchange of gases).
[16] The temperature which has the same reading on both Fahrenheit and Celsius scales is –
A.
40°
B.
-400
C.
-34°
D.
-1400
Ans:
-400
Explanation :
If C is the temperature in Celsius and F is the temperature in Fahrenheit then, C/S = (F-32)/9. They are equal at -40° (minus 40 degrees), because if we convert the readings of Celsius and Fahrenheit, we will have: Celsius to Fahrenheit (-40°C x 9/5) +32 = -72 + 32 = -40°F. Fahrenheit to Celsius (-40°F - 32°) x 5/9 = (-72) x 5/9 = -40°C.
[17] Kilowatt-hour is the unit of :
A.
Energy
B.
Power
C.
Force
D.
Momentum
Ans:
Energy
Explanation :
The kilowatt hour, or kilowatt-hour, is a unit of energy equal to 1000 watt hours or 3.6 mega-joules For constant power, energy in watt hours is the product of power in watts and time in hours. The kilowatt hour is most commonly known as a billing unit for energy delivered to consumers by electric utilities.
[18] In nuclear reactor, heavy water is used as –
A.
coolant
B.
fuel
C.
moderator
D.
atomic smasher
Ans:
moderator
Explanation :
Heavy water is used in certain types of nuclear reactors where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium-238 which captures neutrons without fissioning. Because they do not require uranium enrichment, heavy water reactors are of concern in regards to nuclear proliferation.
[19] Tear gas used by the police to disperse the mob contains –
A.
carbon dioxide
B.
chlorine
C.
ammonia
D.
hydrogen sulphide
Ans:
chlorine
Explanation :
Tear gas, formally known as a lachrymatory agent, is a possibly lethal chemical weapon that stimulates the corneal nerves in the eyes to cause tears, pain, and even blindness. The compound 2chlorobenzalmalononitrile (chemical formula: C10H5ClN2), is the defining component of a "tear gas" commonly referred to as CS gas, which is used as a riot control agent.
[20] Mist is caused by –
A.
dry ice
B.
ice at low temperature
C.
water vapour at low temperature
D.
carbon-monoxide in solid form
Ans:
water vapour at low temperature
Explanation :
Mist is a phenomenon caused by small droplets of water suspended in air. It can occur as part of natural weather or volcanic activity, and is common in cold air above warmer water, in exhaled air in the cold, and in a steam room of a sauna. It can also be created artificially with aerosol canisters if the humidity conditions are right. The only difference between mist and fog is visibility.
[21] The ozone layer in the atmosphere is at a height of about .
A.
25 km
B.
50 km
C.
100 km
D.
200 km
Ans:
50 km
Explanation :
Ozone is mainly found in two regions of the Earth's atmosphere. Most ozone (about 90%) resides in a layer that begins between 10 to 17 kilometers above the Earth's surface and extends up to about 50 kilometers
[22] The part of the eye having the largest refractive index is :
A.
cornea
B.
aqueous humor
C.
lens
D.
vitreous humor
Ans:
lens
Explanation :
The cornea represents the strongest part of the refracting power of the eye, providing about 80% of the power of the system. The index of refraction of the cornea is about 1.376. Rays pass from the cornea into the watery fluid known as the aqueous humor which has an index of refraction of about 1.336. The lens provides perhaps 20% of the refracting power of the eye with a refractive index of 1.386-1.406. the refractive Index of Vitreous Humor is 1.33.
[23] Conversion of heat into electrical er is achieved by using –
A.
Ammeter
B.
Hydrometer
C.
Voltmeter
D.
Thermocouple
Ans:
Thermocouple
Explanation :
Thermoelectric generators convert thermal energy into electricity by using heat from the body — or any object with a temperature gradient — as their energy source. At the heart of every thermoelectric generator is an array of thermocouples that are responsible for converting thermal energy into electricity. Bismuth telluride and its alloys are commonly used in thermocouples.
[24] The filament of electric bulb is made of -
A.
Iron
B.
Nichrome
C.
Tungsten
D.
Graphite
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[25] Necessary element of change in solar energy to electric energy –
A.
Berilliurn
B.
Silicon
C.
Tantelum
D.
Pure Copper
Ans:
Silicon
Explanation :
A small solar electric or photovoltaic (PV) converts solar energy into electrical energy. Solar cells consist of semiconductor materials which work on photoelectric effect. Silicon remains the most popular material for solar cells.
Explanation :
The avian respiratory system delivers oxygen from the air to the tissues and also removes carbon dioxide. In addition, the respiratory system plays an important role in thermoregulation (maintaining normal body temperature). The avian respiratory system is different from that of other vertebrates, with birds having relatively small lungs plus nine air sacs that play an important role in respiration (but are not directly involved in the exchange of gases).
[16] The temperature which has the same reading on both Fahrenheit and Celsius scales is –
A.
40°
B.
-400
C.
-34°
D.
-1400
Ans:
-400
Explanation :
If C is the temperature in Celsius and F is the temperature in Fahrenheit then, C/S = (F-32)/9. They are equal at -40° (minus 40 degrees), because if we convert the readings of Celsius and Fahrenheit, we will have: Celsius to Fahrenheit (-40°C x 9/5) +32 = -72 + 32 = -40°F. Fahrenheit to Celsius (-40°F - 32°) x 5/9 = (-72) x 5/9 = -40°C.
[17] Kilowatt-hour is the unit of :
A.
Energy
B.
Power
C.
Force
D.
Momentum
Ans:
Energy
Explanation :
The kilowatt hour, or kilowatt-hour, is a unit of energy equal to 1000 watt hours or 3.6 mega-joules For constant power, energy in watt hours is the product of power in watts and time in hours. The kilowatt hour is most commonly known as a billing unit for energy delivered to consumers by electric utilities.
[18] In nuclear reactor, heavy water is used as –
A.
coolant
B.
fuel
C.
moderator
D.
atomic smasher
Ans:
moderator
Explanation :
Heavy water is used in certain types of nuclear reactors where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium-238 which captures neutrons without fissioning. Because they do not require uranium enrichment, heavy water reactors are of concern in regards to nuclear proliferation.
[19] Tear gas used by the police to disperse the mob contains –
A.
carbon dioxide
B.
chlorine
C.
ammonia
D.
hydrogen sulphide
Ans:
chlorine
Explanation :
Tear gas, formally known as a lachrymatory agent, is a possibly lethal chemical weapon that stimulates the corneal nerves in the eyes to cause tears, pain, and even blindness. The compound 2chlorobenzalmalononitrile (chemical formula: C10H5ClN2), is the defining component of a "tear gas" commonly referred to as CS gas, which is used as a riot control agent.
[20] Mist is caused by –
A.
dry ice
B.
ice at low temperature
C.
water vapour at low temperature
D.
carbon-monoxide in solid form
Ans:
water vapour at low temperature
Explanation :
Mist is a phenomenon caused by small droplets of water suspended in air. It can occur as part of natural weather or volcanic activity, and is common in cold air above warmer water, in exhaled air in the cold, and in a steam room of a sauna. It can also be created artificially with aerosol canisters if the humidity conditions are right. The only difference between mist and fog is visibility.
[21] The ozone layer in the atmosphere is at a height of about .
A.
25 km
B.
50 km
C.
100 km
D.
200 km
Ans:
50 km
Explanation :
Ozone is mainly found in two regions of the Earth's atmosphere. Most ozone (about 90%) resides in a layer that begins between 10 to 17 kilometers above the Earth's surface and extends up to about 50 kilometers
[22] The part of the eye having the largest refractive index is :
A.
cornea
B.
aqueous humor
C.
lens
D.
vitreous humor
Ans:
lens
Explanation :
The cornea represents the strongest part of the refracting power of the eye, providing about 80% of the power of the system. The index of refraction of the cornea is about 1.376. Rays pass from the cornea into the watery fluid known as the aqueous humor which has an index of refraction of about 1.336. The lens provides perhaps 20% of the refracting power of the eye with a refractive index of 1.386-1.406. the refractive Index of Vitreous Humor is 1.33.
[23] Conversion of heat into electrical er is achieved by using –
A.
Ammeter
B.
Hydrometer
C.
Voltmeter
D.
Thermocouple
Ans:
Thermocouple
Explanation :
Thermoelectric generators convert thermal energy into electricity by using heat from the body — or any object with a temperature gradient — as their energy source. At the heart of every thermoelectric generator is an array of thermocouples that are responsible for converting thermal energy into electricity. Bismuth telluride and its alloys are commonly used in thermocouples.
[24] The filament of electric bulb is made of -
A.
Iron
B.
Nichrome
C.
Tungsten
D.
Graphite
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[25] Necessary element of change in solar energy to electric energy –
A.
Berilliurn
B.
Silicon
C.
Tantelum
D.
Pure Copper
Ans:
Silicon
Explanation :
A small solar electric or photovoltaic (PV) converts solar energy into electrical energy. Solar cells consist of semiconductor materials which work on photoelectric effect. Silicon remains the most popular material for solar cells.
Explanation :
The kilowatt hour, or kilowatt-hour, is a unit of energy equal to 1000 watt hours or 3.6 mega-joules For constant power, energy in watt hours is the product of power in watts and time in hours. The kilowatt hour is most commonly known as a billing unit for energy delivered to consumers by electric utilities.
[18] In nuclear reactor, heavy water is used as –
A.
coolant
B.
fuel
C.
moderator
D.
atomic smasher
Ans:
moderator
Explanation :
Heavy water is used in certain types of nuclear reactors where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium-238 which captures neutrons without fissioning. Because they do not require uranium enrichment, heavy water reactors are of concern in regards to nuclear proliferation.
[19] Tear gas used by the police to disperse the mob contains –
A.
carbon dioxide
B.
chlorine
C.
ammonia
D.
hydrogen sulphide
Ans:
chlorine
Explanation :
Tear gas, formally known as a lachrymatory agent, is a possibly lethal chemical weapon that stimulates the corneal nerves in the eyes to cause tears, pain, and even blindness. The compound 2chlorobenzalmalononitrile (chemical formula: C10H5ClN2), is the defining component of a "tear gas" commonly referred to as CS gas, which is used as a riot control agent.
[20] Mist is caused by –
A.
dry ice
B.
ice at low temperature
C.
water vapour at low temperature
D.
carbon-monoxide in solid form
Ans:
water vapour at low temperature
Explanation :
Mist is a phenomenon caused by small droplets of water suspended in air. It can occur as part of natural weather or volcanic activity, and is common in cold air above warmer water, in exhaled air in the cold, and in a steam room of a sauna. It can also be created artificially with aerosol canisters if the humidity conditions are right. The only difference between mist and fog is visibility.
[21] The ozone layer in the atmosphere is at a height of about .
A.
25 km
B.
50 km
C.
100 km
D.
200 km
Ans:
50 km
Explanation :
Ozone is mainly found in two regions of the Earth's atmosphere. Most ozone (about 90%) resides in a layer that begins between 10 to 17 kilometers above the Earth's surface and extends up to about 50 kilometers
[22] The part of the eye having the largest refractive index is :
A.
cornea
B.
aqueous humor
C.
lens
D.
vitreous humor
Ans:
lens
Explanation :
The cornea represents the strongest part of the refracting power of the eye, providing about 80% of the power of the system. The index of refraction of the cornea is about 1.376. Rays pass from the cornea into the watery fluid known as the aqueous humor which has an index of refraction of about 1.336. The lens provides perhaps 20% of the refracting power of the eye with a refractive index of 1.386-1.406. the refractive Index of Vitreous Humor is 1.33.
[23] Conversion of heat into electrical er is achieved by using –
A.
Ammeter
B.
Hydrometer
C.
Voltmeter
D.
Thermocouple
Ans:
Thermocouple
Explanation :
Thermoelectric generators convert thermal energy into electricity by using heat from the body — or any object with a temperature gradient — as their energy source. At the heart of every thermoelectric generator is an array of thermocouples that are responsible for converting thermal energy into electricity. Bismuth telluride and its alloys are commonly used in thermocouples.
[24] The filament of electric bulb is made of -
A.
Iron
B.
Nichrome
C.
Tungsten
D.
Graphite
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[25] Necessary element of change in solar energy to electric energy –
A.
Berilliurn
B.
Silicon
C.
Tantelum
D.
Pure Copper
Ans:
Silicon
Explanation :
A small solar electric or photovoltaic (PV) converts solar energy into electrical energy. Solar cells consist of semiconductor materials which work on photoelectric effect. Silicon remains the most popular material for solar cells.
Explanation :
Tear gas, formally known as a lachrymatory agent, is a possibly lethal chemical weapon that stimulates the corneal nerves in the eyes to cause tears, pain, and even blindness. The compound 2chlorobenzalmalononitrile (chemical formula: C10H5ClN2), is the defining component of a "tear gas" commonly referred to as CS gas, which is used as a riot control agent.
[20] Mist is caused by –
A.
dry ice
B.
ice at low temperature
C.
water vapour at low temperature
D.
carbon-monoxide in solid form
Ans:
water vapour at low temperature
Explanation :
Mist is a phenomenon caused by small droplets of water suspended in air. It can occur as part of natural weather or volcanic activity, and is common in cold air above warmer water, in exhaled air in the cold, and in a steam room of a sauna. It can also be created artificially with aerosol canisters if the humidity conditions are right. The only difference between mist and fog is visibility.
[21] The ozone layer in the atmosphere is at a height of about .
A.
25 km
B.
50 km
C.
100 km
D.
200 km
Ans:
50 km
Explanation :
Ozone is mainly found in two regions of the Earth's atmosphere. Most ozone (about 90%) resides in a layer that begins between 10 to 17 kilometers above the Earth's surface and extends up to about 50 kilometers
[22] The part of the eye having the largest refractive index is :
A.
cornea
B.
aqueous humor
C.
lens
D.
vitreous humor
Ans:
lens
Explanation :
The cornea represents the strongest part of the refracting power of the eye, providing about 80% of the power of the system. The index of refraction of the cornea is about 1.376. Rays pass from the cornea into the watery fluid known as the aqueous humor which has an index of refraction of about 1.336. The lens provides perhaps 20% of the refracting power of the eye with a refractive index of 1.386-1.406. the refractive Index of Vitreous Humor is 1.33.
[23] Conversion of heat into electrical er is achieved by using –
A.
Ammeter
B.
Hydrometer
C.
Voltmeter
D.
Thermocouple
Ans:
Thermocouple
Explanation :
Thermoelectric generators convert thermal energy into electricity by using heat from the body — or any object with a temperature gradient — as their energy source. At the heart of every thermoelectric generator is an array of thermocouples that are responsible for converting thermal energy into electricity. Bismuth telluride and its alloys are commonly used in thermocouples.
[24] The filament of electric bulb is made of -
A.
Iron
B.
Nichrome
C.
Tungsten
D.
Graphite
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[25] Necessary element of change in solar energy to electric energy –
A.
Berilliurn
B.
Silicon
C.
Tantelum
D.
Pure Copper
Ans:
Silicon
Explanation :
A small solar electric or photovoltaic (PV) converts solar energy into electrical energy. Solar cells consist of semiconductor materials which work on photoelectric effect. Silicon remains the most popular material for solar cells.
Explanation :
Ozone is mainly found in two regions of the Earth's atmosphere. Most ozone (about 90%) resides in a layer that begins between 10 to 17 kilometers above the Earth's surface and extends up to about 50 kilometers
[22] The part of the eye having the largest refractive index is :
A.
cornea
B.
aqueous humor
C.
lens
D.
vitreous humor
Ans:
lens
Explanation :
The cornea represents the strongest part of the refracting power of the eye, providing about 80% of the power of the system. The index of refraction of the cornea is about 1.376. Rays pass from the cornea into the watery fluid known as the aqueous humor which has an index of refraction of about 1.336. The lens provides perhaps 20% of the refracting power of the eye with a refractive index of 1.386-1.406. the refractive Index of Vitreous Humor is 1.33.
[23] Conversion of heat into electrical er is achieved by using –
A.
Ammeter
B.
Hydrometer
C.
Voltmeter
D.
Thermocouple
Ans:
Thermocouple
Explanation :
Thermoelectric generators convert thermal energy into electricity by using heat from the body — or any object with a temperature gradient — as their energy source. At the heart of every thermoelectric generator is an array of thermocouples that are responsible for converting thermal energy into electricity. Bismuth telluride and its alloys are commonly used in thermocouples.
[24] The filament of electric bulb is made of -
A.
Iron
B.
Nichrome
C.
Tungsten
D.
Graphite
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[25] Necessary element of change in solar energy to electric energy –
A.
Berilliurn
B.
Silicon
C.
Tantelum
D.
Pure Copper
Ans:
Silicon
Explanation :
A small solar electric or photovoltaic (PV) converts solar energy into electrical energy. Solar cells consist of semiconductor materials which work on photoelectric effect. Silicon remains the most popular material for solar cells.
Explanation :
Thermoelectric generators convert thermal energy into electricity by using heat from the body — or any object with a temperature gradient — as their energy source. At the heart of every thermoelectric generator is an array of thermocouples that are responsible for converting thermal energy into electricity. Bismuth telluride and its alloys are commonly used in thermocouples.
[24] The filament of electric bulb is made of -
A.
Iron
B.
Nichrome
C.
Tungsten
D.
Graphite
Ans:
Tungsten
Explanation :
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. Tungsten’s many alloys have numerous applications, most notably in incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in TIG welding, and superalloys.
[25] Necessary element of change in solar energy to electric energy –
A.
Berilliurn
B.
Silicon
C.
Tantelum
D.
Pure Copper
Ans:
Silicon
Explanation :
A small solar electric or photovoltaic (PV) converts solar energy into electrical energy. Solar cells consist of semiconductor materials which work on photoelectric effect. Silicon remains the most popular material for solar cells.
Explanation :
A small solar electric or photovoltaic (PV) converts solar energy into electrical energy. Solar cells consist of semiconductor materials which work on photoelectric effect. Silicon remains the most popular material for solar cells.