[1] Which of the following are methods of heat transfer?
A.
Convection
B.
Evaporation
C.
Revolution
D.
Thermal Expansion
Ans:
Convection
Explanation :
Convection is the transfer of heat from one place to another by the movement of fluids. It is usually the dominant form of heat transfer (convection) in liquids and gases. Although often discussed as a distinct method of heat transfer, convective heat transfer involves the combined processes of conduction (heat diffusion) and advection (heat transfer by bulk fluid flow).
[2] Which of the following is the most common element in the Universe?
A.
Nitrogen
B.
Oxygen
C.
Hydrogen
D.
Carbon
Ans:
Hydrogen
Explanation :
Hydrogen is the most abundant element in the Universe; helium is second. However, after this, the rank of abundance does not continue to correspond to the atomic number; oxygen has abundance rank 3, but atomic number 8. All others are substantially less common.
[3] If there were no gravity, which of the following will not be there for a fluid?
A.
Viscosity
B.
Surface Tension
C.
Pressure
D.
Upward Thrust
Ans:
Upward Thrust
Explanation :
If there is no gravity, there will not be any upward thrust to keep a liquid buoyant. Whenever a body is placed in a fluid, the fluid applies resultant up ward directional force on the body and it is called up thrust. It's numerical value which is the product of volume of the fluid displaced, density of the fluid and acceleration due to gravity at the given place. Up thrust increases with increase in acceleration due to gravity and vice versa.
[4] Person who is colorblind cannot distinguish between –
A.
Black and yellow
B.
Red and green
C.
Yellow and white
D.
Green and blue
Ans:
Red and green
Explanation :
Color blindness is the decreased ability to see color or differences in color. The most common form of colour blindness is known as red/green colour blind-ness and most colour blind people suffer from this. Those affected have difficulty with discriminating red and green hues due to the absence or mutation of the red or green retinal photoreceptors.
[5] When we see an object, the image formed on the retina is –
A.
Real and inverted
B.
Real and erect
C.
Virtual and erect
D.
Virtual and inverted
Ans:
Real and inverted
Explanation :
The retina is the thin light-sensitive membrane lining the inner eyeball-towards the back of the eye. As our eye lens is convex in nature, they form mostly real and inverted images on the retina. When the images formed are real and inverted, the message sent by the optic nerve is chemical impulses which turn them into erect images that we see.
[6] The most malleable metal is -
A.
platinum
B.
silver
C.
gold
D.
iron
Ans:
gold
Explanation :
Gold is the most malleable of all metals; a single gram can be beaten into a sheet of 1 square meter, and an ounce into 300 square feet.
[7] Which of the following was the first theory of super conductivity?
A.
Ginzburg Landau theory
B.
London theory
C.
Resonating valence bond theory
D.
Quantum field theory
Ans:
London theory
Explanation :
The first phenomenological theory of superconductivity was London theory. It was put forward by the brothers Fritz and Heinz London in 1935, shortly after the discovery that magnetic fields are expelled from superconductors. A major triumph of the equations of this theory is their ability to explain the Meissner effect, wherein a material exponentially expels all internal magnetic fields as it crosses the superconducting threshold.
[8] Which of the following is the unit of Astronomical Distance?
A.
metre/sec.
B.
Sec.
C.
Para/sec.
D.
Parsec
Ans:
Parsec
Explanation :
A parsec is a unit of length used to measure large distances to objects outside our Solar System. One parsec is the distance at which one astronomical unit subtends an angle of one arc second. A parsec is equal to about 3.26 light-years in length.
[9] If density of oxygen is 16 times that of hydrogen, what will be their corresponding ratio of velocity of sound?
A.
4 : 1
B.
2 : 1
C.
1 : 16
D.
1 : 4
Ans:
1 : 4
Explanation :
0
[10] S.I. unit of Magnetic flux is –
A.
weber
B.
weber/m
C.
weber/m⁴
D.
weber-m²
Ans:
weber
Explanation :
The SI unit of magnetic flux is the Weber (Wb) (in derived units: volt-seconds). It is the magnetic flux that, linking a circuit of one turn, would produce in it an electromotive force of 1 volt if it were reduced to zero at a uniform rate in 1 second. It is named after the German physicist Wilhelm Eduard Weber. The CGS unit of magnetic flux is Maxwell.
[11] Convex mirror is generally used in -
A.
solar cookers
B.
opthalmoscope
C.
reflector for head light
D.
rear view mirror
Ans:
rear view mirror
Explanation :
Rear view mirrors of carsare convex mirrors as they enable the driver to see a wide area of the road behind the car. The convex mirror makes the rays of a parallel beam diverge as if they were coming from its focus, thereby producing a diminished virtual image which the driver can see.
[12] Rotational axis of which of the following planet is highly tilted?
A.
Earth
B.
Uranus
C.
Neptune
D.
Jupiter
Ans:
Uranus
Explanation :
Uranus is a real oddball in our solar system. Its spin axis is tilted by a whopping 98 degrees, meaning it essentially spins on its side. No other planet has anywhere near such a tilt.
[13] A needle or a pin floats on the surface of water because of –
A.
Surface tension
B.
Surface energy
C.
Viscosity
D.
Adhesive force
Ans:
Surface tension
Explanation :
The pin or needle floats because of an invisible elastic skin on the surface of the water. This elastic skin is called surface tension. Surface tension of the water leads to forces strong enough to support the needle's weight.
[14] An object which absorbs all colours and reflects none appears:
A.
White
B.
Grey
C.
Blue
D.
Black
Ans:
Black
Explanation :
A surface that absorbs all colours, reflecting none, is said to be black. Black is not a colour; it absorbs all the colours of the visible spectrum and reflects none of them to the eyes. White is a colour.
[15] Alfred Nobel invented -
A.
X ray
B.
Diesel Engine
C.
Dynamite
D.
Dynamo
Ans:
Dynamite
Explanation :
Alfred Nobel if Sweden invented Dynamite in 1867, X ray was invented by Wilhelm Roentgen of Germany in 1895, Diesel Engine was invented by Rudolf Diesel of Germany 1892, Dynamo was invented by Michael Faraday of England in 1831.
[16] Instrument used to study the behaviour of a vibrating siring is :
A.
Barometer
B.
Hydrometer
C.
(2) Hygrometer
D.
Sonometer
Ans:
Sonometer
Explanation :
A Sonometer is a device for demonstrating the relationship between the frequency of the sound produced by a plucked string, and the tension, length and mass per unit length of the string. These relationships are usually called Mersenne's laws after Marin Mersenne (1588-1648), who investigated and codified them.
[17] The mass of water vapour per unit volume of air is known as -
A.
relative humidity
B.
specific humidity
C.
absolute humidity
D.
variable humidity
Ans:
absolute humidity
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to .
A.
300 m
B.
30 m
C.
3 m
D.
0.3 m
Ans:
300 m
Explanation :
h = 𝐶 𝑉 = 3 × 108/106 = 300 m
[19] The oil in the wick of an oil lamp rises up due to:
A.
capillary action
B.
low viscosity of oil
C.
gravitational force
D.
pressure difference
Ans:
capillary action
Explanation :
The oil in the wick of an oil lamp rises up due to capillary action.
[20] Which of the following properties is generally found, in non-metals?'
A.
Brittleness
B.
Conductivity
C.
Ductility
D.
Malleability
Ans:
Brittleness
Explanation :
An important physical property of non metals is that they are brittle and hence cannot be beaten into sheets or drawn into wires. In other words, non-metals are non-malleable and non-ductile. Where stress is applied on non-metals, they shatter into pieces.
[21] Electrostatic precipitator is used to control –
A.
Chemical Pollutants
B.
Radio-active Pollutants
C.
Water Pollutants
D.
Air Pollutants
Ans:
Air Pollutants
Explanation :
An Electrostatic precipitator is a particulate collection device that removes particles from a flowing gas (such as air) using the force of an induced electrostatic charge. They are useful in controlling air pollutants in particulate form. They are highly efficient filtration devices that minimally impede the flow of gases through the device, and can easily remove fine particulate matter such as dust and smoke from the air stream.
[22] The Newton's First Law is also called as –
A.
Law of moments
B.
Law of inertia
C.
Law of energy
D.
Law of momentum
Ans:
Law of inertia
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it. So this law is known as the law of inertia.
[23] Hydraulic machines work under the principle of –
A.
Newton’s law
B.
Joule law
C.
Pascal’s law
D.
Floatation law
Ans:
Pascal’s law
Explanation :
Hydraulic machines work under the principal of Pascal’s law which states that the pressure in a static hydraulic fluid in a closed system is same everywhere.
[24] The scientist who first discovered that the Earth revolves round the Sun was -
A.
Newton
B.
Dalton
C.
Copernicus
D.
Einsteirn
Ans:
Copernicus
Explanation :
Nicolaus Copernicus was a Polish astronomer who put forth the theory that the Sun is at rest near the center of the Universe, and that the Earth, spinning on its axis once daily, revolves annually around the Sun.
[25] The type of minor used in automobiles to see the traffic on the rear side is –
A.
Concave
B.
Plano-Convex
C.
Plane
D.
Convex
Ans:
Convex
Explanation :
Convex mirrors are used as rear view mirrors in automobiles to see the traffic on the rear side. A convex mirror always produces an erect image of the objects. The image formed in a convex mirror is highly diminished than the object, due to which a convex mirror gives a wide field of view of the traffic behind.
Explanation :
Convection is the transfer of heat from one place to another by the movement of fluids. It is usually the dominant form of heat transfer (convection) in liquids and gases. Although often discussed as a distinct method of heat transfer, convective heat transfer involves the combined processes of conduction (heat diffusion) and advection (heat transfer by bulk fluid flow).
[2] Which of the following is the most common element in the Universe?
A.
Nitrogen
B.
Oxygen
C.
Hydrogen
D.
Carbon
Ans:
Hydrogen
Explanation :
Hydrogen is the most abundant element in the Universe; helium is second. However, after this, the rank of abundance does not continue to correspond to the atomic number; oxygen has abundance rank 3, but atomic number 8. All others are substantially less common.
[3] If there were no gravity, which of the following will not be there for a fluid?
A.
Viscosity
B.
Surface Tension
C.
Pressure
D.
Upward Thrust
Ans:
Upward Thrust
Explanation :
If there is no gravity, there will not be any upward thrust to keep a liquid buoyant. Whenever a body is placed in a fluid, the fluid applies resultant up ward directional force on the body and it is called up thrust. It's numerical value which is the product of volume of the fluid displaced, density of the fluid and acceleration due to gravity at the given place. Up thrust increases with increase in acceleration due to gravity and vice versa.
[4] Person who is colorblind cannot distinguish between –
A.
Black and yellow
B.
Red and green
C.
Yellow and white
D.
Green and blue
Ans:
Red and green
Explanation :
Color blindness is the decreased ability to see color or differences in color. The most common form of colour blindness is known as red/green colour blind-ness and most colour blind people suffer from this. Those affected have difficulty with discriminating red and green hues due to the absence or mutation of the red or green retinal photoreceptors.
[5] When we see an object, the image formed on the retina is –
A.
Real and inverted
B.
Real and erect
C.
Virtual and erect
D.
Virtual and inverted
Ans:
Real and inverted
Explanation :
The retina is the thin light-sensitive membrane lining the inner eyeball-towards the back of the eye. As our eye lens is convex in nature, they form mostly real and inverted images on the retina. When the images formed are real and inverted, the message sent by the optic nerve is chemical impulses which turn them into erect images that we see.
[6] The most malleable metal is -
A.
platinum
B.
silver
C.
gold
D.
iron
Ans:
gold
Explanation :
Gold is the most malleable of all metals; a single gram can be beaten into a sheet of 1 square meter, and an ounce into 300 square feet.
[7] Which of the following was the first theory of super conductivity?
A.
Ginzburg Landau theory
B.
London theory
C.
Resonating valence bond theory
D.
Quantum field theory
Ans:
London theory
Explanation :
The first phenomenological theory of superconductivity was London theory. It was put forward by the brothers Fritz and Heinz London in 1935, shortly after the discovery that magnetic fields are expelled from superconductors. A major triumph of the equations of this theory is their ability to explain the Meissner effect, wherein a material exponentially expels all internal magnetic fields as it crosses the superconducting threshold.
[8] Which of the following is the unit of Astronomical Distance?
A.
metre/sec.
B.
Sec.
C.
Para/sec.
D.
Parsec
Ans:
Parsec
Explanation :
A parsec is a unit of length used to measure large distances to objects outside our Solar System. One parsec is the distance at which one astronomical unit subtends an angle of one arc second. A parsec is equal to about 3.26 light-years in length.
[9] If density of oxygen is 16 times that of hydrogen, what will be their corresponding ratio of velocity of sound?
A.
4 : 1
B.
2 : 1
C.
1 : 16
D.
1 : 4
Ans:
1 : 4
Explanation :
0
[10] S.I. unit of Magnetic flux is –
A.
weber
B.
weber/m
C.
weber/m⁴
D.
weber-m²
Ans:
weber
Explanation :
The SI unit of magnetic flux is the Weber (Wb) (in derived units: volt-seconds). It is the magnetic flux that, linking a circuit of one turn, would produce in it an electromotive force of 1 volt if it were reduced to zero at a uniform rate in 1 second. It is named after the German physicist Wilhelm Eduard Weber. The CGS unit of magnetic flux is Maxwell.
[11] Convex mirror is generally used in -
A.
solar cookers
B.
opthalmoscope
C.
reflector for head light
D.
rear view mirror
Ans:
rear view mirror
Explanation :
Rear view mirrors of carsare convex mirrors as they enable the driver to see a wide area of the road behind the car. The convex mirror makes the rays of a parallel beam diverge as if they were coming from its focus, thereby producing a diminished virtual image which the driver can see.
[12] Rotational axis of which of the following planet is highly tilted?
A.
Earth
B.
Uranus
C.
Neptune
D.
Jupiter
Ans:
Uranus
Explanation :
Uranus is a real oddball in our solar system. Its spin axis is tilted by a whopping 98 degrees, meaning it essentially spins on its side. No other planet has anywhere near such a tilt.
[13] A needle or a pin floats on the surface of water because of –
A.
Surface tension
B.
Surface energy
C.
Viscosity
D.
Adhesive force
Ans:
Surface tension
Explanation :
The pin or needle floats because of an invisible elastic skin on the surface of the water. This elastic skin is called surface tension. Surface tension of the water leads to forces strong enough to support the needle's weight.
[14] An object which absorbs all colours and reflects none appears:
A.
White
B.
Grey
C.
Blue
D.
Black
Ans:
Black
Explanation :
A surface that absorbs all colours, reflecting none, is said to be black. Black is not a colour; it absorbs all the colours of the visible spectrum and reflects none of them to the eyes. White is a colour.
[15] Alfred Nobel invented -
A.
X ray
B.
Diesel Engine
C.
Dynamite
D.
Dynamo
Ans:
Dynamite
Explanation :
Alfred Nobel if Sweden invented Dynamite in 1867, X ray was invented by Wilhelm Roentgen of Germany in 1895, Diesel Engine was invented by Rudolf Diesel of Germany 1892, Dynamo was invented by Michael Faraday of England in 1831.
[16] Instrument used to study the behaviour of a vibrating siring is :
A.
Barometer
B.
Hydrometer
C.
(2) Hygrometer
D.
Sonometer
Ans:
Sonometer
Explanation :
A Sonometer is a device for demonstrating the relationship between the frequency of the sound produced by a plucked string, and the tension, length and mass per unit length of the string. These relationships are usually called Mersenne's laws after Marin Mersenne (1588-1648), who investigated and codified them.
[17] The mass of water vapour per unit volume of air is known as -
A.
relative humidity
B.
specific humidity
C.
absolute humidity
D.
variable humidity
Ans:
absolute humidity
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to .
A.
300 m
B.
30 m
C.
3 m
D.
0.3 m
Ans:
300 m
Explanation :
h = 𝐶 𝑉 = 3 × 108/106 = 300 m
[19] The oil in the wick of an oil lamp rises up due to:
A.
capillary action
B.
low viscosity of oil
C.
gravitational force
D.
pressure difference
Ans:
capillary action
Explanation :
The oil in the wick of an oil lamp rises up due to capillary action.
[20] Which of the following properties is generally found, in non-metals?'
A.
Brittleness
B.
Conductivity
C.
Ductility
D.
Malleability
Ans:
Brittleness
Explanation :
An important physical property of non metals is that they are brittle and hence cannot be beaten into sheets or drawn into wires. In other words, non-metals are non-malleable and non-ductile. Where stress is applied on non-metals, they shatter into pieces.
[21] Electrostatic precipitator is used to control –
A.
Chemical Pollutants
B.
Radio-active Pollutants
C.
Water Pollutants
D.
Air Pollutants
Ans:
Air Pollutants
Explanation :
An Electrostatic precipitator is a particulate collection device that removes particles from a flowing gas (such as air) using the force of an induced electrostatic charge. They are useful in controlling air pollutants in particulate form. They are highly efficient filtration devices that minimally impede the flow of gases through the device, and can easily remove fine particulate matter such as dust and smoke from the air stream.
[22] The Newton's First Law is also called as –
A.
Law of moments
B.
Law of inertia
C.
Law of energy
D.
Law of momentum
Ans:
Law of inertia
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it. So this law is known as the law of inertia.
[23] Hydraulic machines work under the principle of –
A.
Newton’s law
B.
Joule law
C.
Pascal’s law
D.
Floatation law
Ans:
Pascal’s law
Explanation :
Hydraulic machines work under the principal of Pascal’s law which states that the pressure in a static hydraulic fluid in a closed system is same everywhere.
[24] The scientist who first discovered that the Earth revolves round the Sun was -
A.
Newton
B.
Dalton
C.
Copernicus
D.
Einsteirn
Ans:
Copernicus
Explanation :
Nicolaus Copernicus was a Polish astronomer who put forth the theory that the Sun is at rest near the center of the Universe, and that the Earth, spinning on its axis once daily, revolves annually around the Sun.
[25] The type of minor used in automobiles to see the traffic on the rear side is –
A.
Concave
B.
Plano-Convex
C.
Plane
D.
Convex
Ans:
Convex
Explanation :
Convex mirrors are used as rear view mirrors in automobiles to see the traffic on the rear side. A convex mirror always produces an erect image of the objects. The image formed in a convex mirror is highly diminished than the object, due to which a convex mirror gives a wide field of view of the traffic behind.
Explanation :
If there is no gravity, there will not be any upward thrust to keep a liquid buoyant. Whenever a body is placed in a fluid, the fluid applies resultant up ward directional force on the body and it is called up thrust. It's numerical value which is the product of volume of the fluid displaced, density of the fluid and acceleration due to gravity at the given place. Up thrust increases with increase in acceleration due to gravity and vice versa.
[4] Person who is colorblind cannot distinguish between –
A.
Black and yellow
B.
Red and green
C.
Yellow and white
D.
Green and blue
Ans:
Red and green
Explanation :
Color blindness is the decreased ability to see color or differences in color. The most common form of colour blindness is known as red/green colour blind-ness and most colour blind people suffer from this. Those affected have difficulty with discriminating red and green hues due to the absence or mutation of the red or green retinal photoreceptors.
[5] When we see an object, the image formed on the retina is –
A.
Real and inverted
B.
Real and erect
C.
Virtual and erect
D.
Virtual and inverted
Ans:
Real and inverted
Explanation :
The retina is the thin light-sensitive membrane lining the inner eyeball-towards the back of the eye. As our eye lens is convex in nature, they form mostly real and inverted images on the retina. When the images formed are real and inverted, the message sent by the optic nerve is chemical impulses which turn them into erect images that we see.
[6] The most malleable metal is -
A.
platinum
B.
silver
C.
gold
D.
iron
Ans:
gold
Explanation :
Gold is the most malleable of all metals; a single gram can be beaten into a sheet of 1 square meter, and an ounce into 300 square feet.
[7] Which of the following was the first theory of super conductivity?
A.
Ginzburg Landau theory
B.
London theory
C.
Resonating valence bond theory
D.
Quantum field theory
Ans:
London theory
Explanation :
The first phenomenological theory of superconductivity was London theory. It was put forward by the brothers Fritz and Heinz London in 1935, shortly after the discovery that magnetic fields are expelled from superconductors. A major triumph of the equations of this theory is their ability to explain the Meissner effect, wherein a material exponentially expels all internal magnetic fields as it crosses the superconducting threshold.
[8] Which of the following is the unit of Astronomical Distance?
A.
metre/sec.
B.
Sec.
C.
Para/sec.
D.
Parsec
Ans:
Parsec
Explanation :
A parsec is a unit of length used to measure large distances to objects outside our Solar System. One parsec is the distance at which one astronomical unit subtends an angle of one arc second. A parsec is equal to about 3.26 light-years in length.
[9] If density of oxygen is 16 times that of hydrogen, what will be their corresponding ratio of velocity of sound?
A.
4 : 1
B.
2 : 1
C.
1 : 16
D.
1 : 4
Ans:
1 : 4
Explanation :
0
[10] S.I. unit of Magnetic flux is –
A.
weber
B.
weber/m
C.
weber/m⁴
D.
weber-m²
Ans:
weber
Explanation :
The SI unit of magnetic flux is the Weber (Wb) (in derived units: volt-seconds). It is the magnetic flux that, linking a circuit of one turn, would produce in it an electromotive force of 1 volt if it were reduced to zero at a uniform rate in 1 second. It is named after the German physicist Wilhelm Eduard Weber. The CGS unit of magnetic flux is Maxwell.
[11] Convex mirror is generally used in -
A.
solar cookers
B.
opthalmoscope
C.
reflector for head light
D.
rear view mirror
Ans:
rear view mirror
Explanation :
Rear view mirrors of carsare convex mirrors as they enable the driver to see a wide area of the road behind the car. The convex mirror makes the rays of a parallel beam diverge as if they were coming from its focus, thereby producing a diminished virtual image which the driver can see.
[12] Rotational axis of which of the following planet is highly tilted?
A.
Earth
B.
Uranus
C.
Neptune
D.
Jupiter
Ans:
Uranus
Explanation :
Uranus is a real oddball in our solar system. Its spin axis is tilted by a whopping 98 degrees, meaning it essentially spins on its side. No other planet has anywhere near such a tilt.
[13] A needle or a pin floats on the surface of water because of –
A.
Surface tension
B.
Surface energy
C.
Viscosity
D.
Adhesive force
Ans:
Surface tension
Explanation :
The pin or needle floats because of an invisible elastic skin on the surface of the water. This elastic skin is called surface tension. Surface tension of the water leads to forces strong enough to support the needle's weight.
[14] An object which absorbs all colours and reflects none appears:
A.
White
B.
Grey
C.
Blue
D.
Black
Ans:
Black
Explanation :
A surface that absorbs all colours, reflecting none, is said to be black. Black is not a colour; it absorbs all the colours of the visible spectrum and reflects none of them to the eyes. White is a colour.
[15] Alfred Nobel invented -
A.
X ray
B.
Diesel Engine
C.
Dynamite
D.
Dynamo
Ans:
Dynamite
Explanation :
Alfred Nobel if Sweden invented Dynamite in 1867, X ray was invented by Wilhelm Roentgen of Germany in 1895, Diesel Engine was invented by Rudolf Diesel of Germany 1892, Dynamo was invented by Michael Faraday of England in 1831.
[16] Instrument used to study the behaviour of a vibrating siring is :
A.
Barometer
B.
Hydrometer
C.
(2) Hygrometer
D.
Sonometer
Ans:
Sonometer
Explanation :
A Sonometer is a device for demonstrating the relationship between the frequency of the sound produced by a plucked string, and the tension, length and mass per unit length of the string. These relationships are usually called Mersenne's laws after Marin Mersenne (1588-1648), who investigated and codified them.
[17] The mass of water vapour per unit volume of air is known as -
A.
relative humidity
B.
specific humidity
C.
absolute humidity
D.
variable humidity
Ans:
absolute humidity
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to .
A.
300 m
B.
30 m
C.
3 m
D.
0.3 m
Ans:
300 m
Explanation :
h = 𝐶 𝑉 = 3 × 108/106 = 300 m
[19] The oil in the wick of an oil lamp rises up due to:
A.
capillary action
B.
low viscosity of oil
C.
gravitational force
D.
pressure difference
Ans:
capillary action
Explanation :
The oil in the wick of an oil lamp rises up due to capillary action.
[20] Which of the following properties is generally found, in non-metals?'
A.
Brittleness
B.
Conductivity
C.
Ductility
D.
Malleability
Ans:
Brittleness
Explanation :
An important physical property of non metals is that they are brittle and hence cannot be beaten into sheets or drawn into wires. In other words, non-metals are non-malleable and non-ductile. Where stress is applied on non-metals, they shatter into pieces.
[21] Electrostatic precipitator is used to control –
A.
Chemical Pollutants
B.
Radio-active Pollutants
C.
Water Pollutants
D.
Air Pollutants
Ans:
Air Pollutants
Explanation :
An Electrostatic precipitator is a particulate collection device that removes particles from a flowing gas (such as air) using the force of an induced electrostatic charge. They are useful in controlling air pollutants in particulate form. They are highly efficient filtration devices that minimally impede the flow of gases through the device, and can easily remove fine particulate matter such as dust and smoke from the air stream.
[22] The Newton's First Law is also called as –
A.
Law of moments
B.
Law of inertia
C.
Law of energy
D.
Law of momentum
Ans:
Law of inertia
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it. So this law is known as the law of inertia.
[23] Hydraulic machines work under the principle of –
A.
Newton’s law
B.
Joule law
C.
Pascal’s law
D.
Floatation law
Ans:
Pascal’s law
Explanation :
Hydraulic machines work under the principal of Pascal’s law which states that the pressure in a static hydraulic fluid in a closed system is same everywhere.
[24] The scientist who first discovered that the Earth revolves round the Sun was -
A.
Newton
B.
Dalton
C.
Copernicus
D.
Einsteirn
Ans:
Copernicus
Explanation :
Nicolaus Copernicus was a Polish astronomer who put forth the theory that the Sun is at rest near the center of the Universe, and that the Earth, spinning on its axis once daily, revolves annually around the Sun.
[25] The type of minor used in automobiles to see the traffic on the rear side is –
A.
Concave
B.
Plano-Convex
C.
Plane
D.
Convex
Ans:
Convex
Explanation :
Convex mirrors are used as rear view mirrors in automobiles to see the traffic on the rear side. A convex mirror always produces an erect image of the objects. The image formed in a convex mirror is highly diminished than the object, due to which a convex mirror gives a wide field of view of the traffic behind.
Explanation :
The retina is the thin light-sensitive membrane lining the inner eyeball-towards the back of the eye. As our eye lens is convex in nature, they form mostly real and inverted images on the retina. When the images formed are real and inverted, the message sent by the optic nerve is chemical impulses which turn them into erect images that we see.
[6] The most malleable metal is -
A.
platinum
B.
silver
C.
gold
D.
iron
Ans:
gold
Explanation :
Gold is the most malleable of all metals; a single gram can be beaten into a sheet of 1 square meter, and an ounce into 300 square feet.
[7] Which of the following was the first theory of super conductivity?
A.
Ginzburg Landau theory
B.
London theory
C.
Resonating valence bond theory
D.
Quantum field theory
Ans:
London theory
Explanation :
The first phenomenological theory of superconductivity was London theory. It was put forward by the brothers Fritz and Heinz London in 1935, shortly after the discovery that magnetic fields are expelled from superconductors. A major triumph of the equations of this theory is their ability to explain the Meissner effect, wherein a material exponentially expels all internal magnetic fields as it crosses the superconducting threshold.
[8] Which of the following is the unit of Astronomical Distance?
A.
metre/sec.
B.
Sec.
C.
Para/sec.
D.
Parsec
Ans:
Parsec
Explanation :
A parsec is a unit of length used to measure large distances to objects outside our Solar System. One parsec is the distance at which one astronomical unit subtends an angle of one arc second. A parsec is equal to about 3.26 light-years in length.
[9] If density of oxygen is 16 times that of hydrogen, what will be their corresponding ratio of velocity of sound?
A.
4 : 1
B.
2 : 1
C.
1 : 16
D.
1 : 4
Ans:
1 : 4
Explanation :
0
[10] S.I. unit of Magnetic flux is –
A.
weber
B.
weber/m
C.
weber/m⁴
D.
weber-m²
Ans:
weber
Explanation :
The SI unit of magnetic flux is the Weber (Wb) (in derived units: volt-seconds). It is the magnetic flux that, linking a circuit of one turn, would produce in it an electromotive force of 1 volt if it were reduced to zero at a uniform rate in 1 second. It is named after the German physicist Wilhelm Eduard Weber. The CGS unit of magnetic flux is Maxwell.
[11] Convex mirror is generally used in -
A.
solar cookers
B.
opthalmoscope
C.
reflector for head light
D.
rear view mirror
Ans:
rear view mirror
Explanation :
Rear view mirrors of carsare convex mirrors as they enable the driver to see a wide area of the road behind the car. The convex mirror makes the rays of a parallel beam diverge as if they were coming from its focus, thereby producing a diminished virtual image which the driver can see.
[12] Rotational axis of which of the following planet is highly tilted?
A.
Earth
B.
Uranus
C.
Neptune
D.
Jupiter
Ans:
Uranus
Explanation :
Uranus is a real oddball in our solar system. Its spin axis is tilted by a whopping 98 degrees, meaning it essentially spins on its side. No other planet has anywhere near such a tilt.
[13] A needle or a pin floats on the surface of water because of –
A.
Surface tension
B.
Surface energy
C.
Viscosity
D.
Adhesive force
Ans:
Surface tension
Explanation :
The pin or needle floats because of an invisible elastic skin on the surface of the water. This elastic skin is called surface tension. Surface tension of the water leads to forces strong enough to support the needle's weight.
[14] An object which absorbs all colours and reflects none appears:
A.
White
B.
Grey
C.
Blue
D.
Black
Ans:
Black
Explanation :
A surface that absorbs all colours, reflecting none, is said to be black. Black is not a colour; it absorbs all the colours of the visible spectrum and reflects none of them to the eyes. White is a colour.
[15] Alfred Nobel invented -
A.
X ray
B.
Diesel Engine
C.
Dynamite
D.
Dynamo
Ans:
Dynamite
Explanation :
Alfred Nobel if Sweden invented Dynamite in 1867, X ray was invented by Wilhelm Roentgen of Germany in 1895, Diesel Engine was invented by Rudolf Diesel of Germany 1892, Dynamo was invented by Michael Faraday of England in 1831.
[16] Instrument used to study the behaviour of a vibrating siring is :
A.
Barometer
B.
Hydrometer
C.
(2) Hygrometer
D.
Sonometer
Ans:
Sonometer
Explanation :
A Sonometer is a device for demonstrating the relationship between the frequency of the sound produced by a plucked string, and the tension, length and mass per unit length of the string. These relationships are usually called Mersenne's laws after Marin Mersenne (1588-1648), who investigated and codified them.
[17] The mass of water vapour per unit volume of air is known as -
A.
relative humidity
B.
specific humidity
C.
absolute humidity
D.
variable humidity
Ans:
absolute humidity
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to .
A.
300 m
B.
30 m
C.
3 m
D.
0.3 m
Ans:
300 m
Explanation :
h = 𝐶 𝑉 = 3 × 108/106 = 300 m
[19] The oil in the wick of an oil lamp rises up due to:
A.
capillary action
B.
low viscosity of oil
C.
gravitational force
D.
pressure difference
Ans:
capillary action
Explanation :
The oil in the wick of an oil lamp rises up due to capillary action.
[20] Which of the following properties is generally found, in non-metals?'
A.
Brittleness
B.
Conductivity
C.
Ductility
D.
Malleability
Ans:
Brittleness
Explanation :
An important physical property of non metals is that they are brittle and hence cannot be beaten into sheets or drawn into wires. In other words, non-metals are non-malleable and non-ductile. Where stress is applied on non-metals, they shatter into pieces.
[21] Electrostatic precipitator is used to control –
A.
Chemical Pollutants
B.
Radio-active Pollutants
C.
Water Pollutants
D.
Air Pollutants
Ans:
Air Pollutants
Explanation :
An Electrostatic precipitator is a particulate collection device that removes particles from a flowing gas (such as air) using the force of an induced electrostatic charge. They are useful in controlling air pollutants in particulate form. They are highly efficient filtration devices that minimally impede the flow of gases through the device, and can easily remove fine particulate matter such as dust and smoke from the air stream.
[22] The Newton's First Law is also called as –
A.
Law of moments
B.
Law of inertia
C.
Law of energy
D.
Law of momentum
Ans:
Law of inertia
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it. So this law is known as the law of inertia.
[23] Hydraulic machines work under the principle of –
A.
Newton’s law
B.
Joule law
C.
Pascal’s law
D.
Floatation law
Ans:
Pascal’s law
Explanation :
Hydraulic machines work under the principal of Pascal’s law which states that the pressure in a static hydraulic fluid in a closed system is same everywhere.
[24] The scientist who first discovered that the Earth revolves round the Sun was -
A.
Newton
B.
Dalton
C.
Copernicus
D.
Einsteirn
Ans:
Copernicus
Explanation :
Nicolaus Copernicus was a Polish astronomer who put forth the theory that the Sun is at rest near the center of the Universe, and that the Earth, spinning on its axis once daily, revolves annually around the Sun.
[25] The type of minor used in automobiles to see the traffic on the rear side is –
A.
Concave
B.
Plano-Convex
C.
Plane
D.
Convex
Ans:
Convex
Explanation :
Convex mirrors are used as rear view mirrors in automobiles to see the traffic on the rear side. A convex mirror always produces an erect image of the objects. The image formed in a convex mirror is highly diminished than the object, due to which a convex mirror gives a wide field of view of the traffic behind.
Explanation :
The first phenomenological theory of superconductivity was London theory. It was put forward by the brothers Fritz and Heinz London in 1935, shortly after the discovery that magnetic fields are expelled from superconductors. A major triumph of the equations of this theory is their ability to explain the Meissner effect, wherein a material exponentially expels all internal magnetic fields as it crosses the superconducting threshold.
[8] Which of the following is the unit of Astronomical Distance?
A.
metre/sec.
B.
Sec.
C.
Para/sec.
D.
Parsec
Ans:
Parsec
Explanation :
A parsec is a unit of length used to measure large distances to objects outside our Solar System. One parsec is the distance at which one astronomical unit subtends an angle of one arc second. A parsec is equal to about 3.26 light-years in length.
[9] If density of oxygen is 16 times that of hydrogen, what will be their corresponding ratio of velocity of sound?
A.
4 : 1
B.
2 : 1
C.
1 : 16
D.
1 : 4
Ans:
1 : 4
Explanation :
0
[10] S.I. unit of Magnetic flux is –
A.
weber
B.
weber/m
C.
weber/m⁴
D.
weber-m²
Ans:
weber
Explanation :
The SI unit of magnetic flux is the Weber (Wb) (in derived units: volt-seconds). It is the magnetic flux that, linking a circuit of one turn, would produce in it an electromotive force of 1 volt if it were reduced to zero at a uniform rate in 1 second. It is named after the German physicist Wilhelm Eduard Weber. The CGS unit of magnetic flux is Maxwell.
[11] Convex mirror is generally used in -
A.
solar cookers
B.
opthalmoscope
C.
reflector for head light
D.
rear view mirror
Ans:
rear view mirror
Explanation :
Rear view mirrors of carsare convex mirrors as they enable the driver to see a wide area of the road behind the car. The convex mirror makes the rays of a parallel beam diverge as if they were coming from its focus, thereby producing a diminished virtual image which the driver can see.
[12] Rotational axis of which of the following planet is highly tilted?
A.
Earth
B.
Uranus
C.
Neptune
D.
Jupiter
Ans:
Uranus
Explanation :
Uranus is a real oddball in our solar system. Its spin axis is tilted by a whopping 98 degrees, meaning it essentially spins on its side. No other planet has anywhere near such a tilt.
[13] A needle or a pin floats on the surface of water because of –
A.
Surface tension
B.
Surface energy
C.
Viscosity
D.
Adhesive force
Ans:
Surface tension
Explanation :
The pin or needle floats because of an invisible elastic skin on the surface of the water. This elastic skin is called surface tension. Surface tension of the water leads to forces strong enough to support the needle's weight.
[14] An object which absorbs all colours and reflects none appears:
A.
White
B.
Grey
C.
Blue
D.
Black
Ans:
Black
Explanation :
A surface that absorbs all colours, reflecting none, is said to be black. Black is not a colour; it absorbs all the colours of the visible spectrum and reflects none of them to the eyes. White is a colour.
[15] Alfred Nobel invented -
A.
X ray
B.
Diesel Engine
C.
Dynamite
D.
Dynamo
Ans:
Dynamite
Explanation :
Alfred Nobel if Sweden invented Dynamite in 1867, X ray was invented by Wilhelm Roentgen of Germany in 1895, Diesel Engine was invented by Rudolf Diesel of Germany 1892, Dynamo was invented by Michael Faraday of England in 1831.
[16] Instrument used to study the behaviour of a vibrating siring is :
A.
Barometer
B.
Hydrometer
C.
(2) Hygrometer
D.
Sonometer
Ans:
Sonometer
Explanation :
A Sonometer is a device for demonstrating the relationship between the frequency of the sound produced by a plucked string, and the tension, length and mass per unit length of the string. These relationships are usually called Mersenne's laws after Marin Mersenne (1588-1648), who investigated and codified them.
[17] The mass of water vapour per unit volume of air is known as -
A.
relative humidity
B.
specific humidity
C.
absolute humidity
D.
variable humidity
Ans:
absolute humidity
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to .
A.
300 m
B.
30 m
C.
3 m
D.
0.3 m
Ans:
300 m
Explanation :
h = 𝐶 𝑉 = 3 × 108/106 = 300 m
[19] The oil in the wick of an oil lamp rises up due to:
A.
capillary action
B.
low viscosity of oil
C.
gravitational force
D.
pressure difference
Ans:
capillary action
Explanation :
The oil in the wick of an oil lamp rises up due to capillary action.
[20] Which of the following properties is generally found, in non-metals?'
A.
Brittleness
B.
Conductivity
C.
Ductility
D.
Malleability
Ans:
Brittleness
Explanation :
An important physical property of non metals is that they are brittle and hence cannot be beaten into sheets or drawn into wires. In other words, non-metals are non-malleable and non-ductile. Where stress is applied on non-metals, they shatter into pieces.
[21] Electrostatic precipitator is used to control –
A.
Chemical Pollutants
B.
Radio-active Pollutants
C.
Water Pollutants
D.
Air Pollutants
Ans:
Air Pollutants
Explanation :
An Electrostatic precipitator is a particulate collection device that removes particles from a flowing gas (such as air) using the force of an induced electrostatic charge. They are useful in controlling air pollutants in particulate form. They are highly efficient filtration devices that minimally impede the flow of gases through the device, and can easily remove fine particulate matter such as dust and smoke from the air stream.
[22] The Newton's First Law is also called as –
A.
Law of moments
B.
Law of inertia
C.
Law of energy
D.
Law of momentum
Ans:
Law of inertia
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it. So this law is known as the law of inertia.
[23] Hydraulic machines work under the principle of –
A.
Newton’s law
B.
Joule law
C.
Pascal’s law
D.
Floatation law
Ans:
Pascal’s law
Explanation :
Hydraulic machines work under the principal of Pascal’s law which states that the pressure in a static hydraulic fluid in a closed system is same everywhere.
[24] The scientist who first discovered that the Earth revolves round the Sun was -
A.
Newton
B.
Dalton
C.
Copernicus
D.
Einsteirn
Ans:
Copernicus
Explanation :
Nicolaus Copernicus was a Polish astronomer who put forth the theory that the Sun is at rest near the center of the Universe, and that the Earth, spinning on its axis once daily, revolves annually around the Sun.
[25] The type of minor used in automobiles to see the traffic on the rear side is –
A.
Concave
B.
Plano-Convex
C.
Plane
D.
Convex
Ans:
Convex
Explanation :
Convex mirrors are used as rear view mirrors in automobiles to see the traffic on the rear side. A convex mirror always produces an erect image of the objects. The image formed in a convex mirror is highly diminished than the object, due to which a convex mirror gives a wide field of view of the traffic behind.
Explanation :
0
[10] S.I. unit of Magnetic flux is –
A.
weber
B.
weber/m
C.
weber/m⁴
D.
weber-m²
Ans:
weber
Explanation :
The SI unit of magnetic flux is the Weber (Wb) (in derived units: volt-seconds). It is the magnetic flux that, linking a circuit of one turn, would produce in it an electromotive force of 1 volt if it were reduced to zero at a uniform rate in 1 second. It is named after the German physicist Wilhelm Eduard Weber. The CGS unit of magnetic flux is Maxwell.
[11] Convex mirror is generally used in -
A.
solar cookers
B.
opthalmoscope
C.
reflector for head light
D.
rear view mirror
Ans:
rear view mirror
Explanation :
Rear view mirrors of carsare convex mirrors as they enable the driver to see a wide area of the road behind the car. The convex mirror makes the rays of a parallel beam diverge as if they were coming from its focus, thereby producing a diminished virtual image which the driver can see.
[12] Rotational axis of which of the following planet is highly tilted?
A.
Earth
B.
Uranus
C.
Neptune
D.
Jupiter
Ans:
Uranus
Explanation :
Uranus is a real oddball in our solar system. Its spin axis is tilted by a whopping 98 degrees, meaning it essentially spins on its side. No other planet has anywhere near such a tilt.
[13] A needle or a pin floats on the surface of water because of –
A.
Surface tension
B.
Surface energy
C.
Viscosity
D.
Adhesive force
Ans:
Surface tension
Explanation :
The pin or needle floats because of an invisible elastic skin on the surface of the water. This elastic skin is called surface tension. Surface tension of the water leads to forces strong enough to support the needle's weight.
[14] An object which absorbs all colours and reflects none appears:
A.
White
B.
Grey
C.
Blue
D.
Black
Ans:
Black
Explanation :
A surface that absorbs all colours, reflecting none, is said to be black. Black is not a colour; it absorbs all the colours of the visible spectrum and reflects none of them to the eyes. White is a colour.
[15] Alfred Nobel invented -
A.
X ray
B.
Diesel Engine
C.
Dynamite
D.
Dynamo
Ans:
Dynamite
Explanation :
Alfred Nobel if Sweden invented Dynamite in 1867, X ray was invented by Wilhelm Roentgen of Germany in 1895, Diesel Engine was invented by Rudolf Diesel of Germany 1892, Dynamo was invented by Michael Faraday of England in 1831.
[16] Instrument used to study the behaviour of a vibrating siring is :
A.
Barometer
B.
Hydrometer
C.
(2) Hygrometer
D.
Sonometer
Ans:
Sonometer
Explanation :
A Sonometer is a device for demonstrating the relationship between the frequency of the sound produced by a plucked string, and the tension, length and mass per unit length of the string. These relationships are usually called Mersenne's laws after Marin Mersenne (1588-1648), who investigated and codified them.
[17] The mass of water vapour per unit volume of air is known as -
A.
relative humidity
B.
specific humidity
C.
absolute humidity
D.
variable humidity
Ans:
absolute humidity
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to .
A.
300 m
B.
30 m
C.
3 m
D.
0.3 m
Ans:
300 m
Explanation :
h = 𝐶 𝑉 = 3 × 108/106 = 300 m
[19] The oil in the wick of an oil lamp rises up due to:
A.
capillary action
B.
low viscosity of oil
C.
gravitational force
D.
pressure difference
Ans:
capillary action
Explanation :
The oil in the wick of an oil lamp rises up due to capillary action.
[20] Which of the following properties is generally found, in non-metals?'
A.
Brittleness
B.
Conductivity
C.
Ductility
D.
Malleability
Ans:
Brittleness
Explanation :
An important physical property of non metals is that they are brittle and hence cannot be beaten into sheets or drawn into wires. In other words, non-metals are non-malleable and non-ductile. Where stress is applied on non-metals, they shatter into pieces.
[21] Electrostatic precipitator is used to control –
A.
Chemical Pollutants
B.
Radio-active Pollutants
C.
Water Pollutants
D.
Air Pollutants
Ans:
Air Pollutants
Explanation :
An Electrostatic precipitator is a particulate collection device that removes particles from a flowing gas (such as air) using the force of an induced electrostatic charge. They are useful in controlling air pollutants in particulate form. They are highly efficient filtration devices that minimally impede the flow of gases through the device, and can easily remove fine particulate matter such as dust and smoke from the air stream.
[22] The Newton's First Law is also called as –
A.
Law of moments
B.
Law of inertia
C.
Law of energy
D.
Law of momentum
Ans:
Law of inertia
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it. So this law is known as the law of inertia.
[23] Hydraulic machines work under the principle of –
A.
Newton’s law
B.
Joule law
C.
Pascal’s law
D.
Floatation law
Ans:
Pascal’s law
Explanation :
Hydraulic machines work under the principal of Pascal’s law which states that the pressure in a static hydraulic fluid in a closed system is same everywhere.
[24] The scientist who first discovered that the Earth revolves round the Sun was -
A.
Newton
B.
Dalton
C.
Copernicus
D.
Einsteirn
Ans:
Copernicus
Explanation :
Nicolaus Copernicus was a Polish astronomer who put forth the theory that the Sun is at rest near the center of the Universe, and that the Earth, spinning on its axis once daily, revolves annually around the Sun.
[25] The type of minor used in automobiles to see the traffic on the rear side is –
A.
Concave
B.
Plano-Convex
C.
Plane
D.
Convex
Ans:
Convex
Explanation :
Convex mirrors are used as rear view mirrors in automobiles to see the traffic on the rear side. A convex mirror always produces an erect image of the objects. The image formed in a convex mirror is highly diminished than the object, due to which a convex mirror gives a wide field of view of the traffic behind.
Explanation :
Rear view mirrors of carsare convex mirrors as they enable the driver to see a wide area of the road behind the car. The convex mirror makes the rays of a parallel beam diverge as if they were coming from its focus, thereby producing a diminished virtual image which the driver can see.
[12] Rotational axis of which of the following planet is highly tilted?
A.
Earth
B.
Uranus
C.
Neptune
D.
Jupiter
Ans:
Uranus
Explanation :
Uranus is a real oddball in our solar system. Its spin axis is tilted by a whopping 98 degrees, meaning it essentially spins on its side. No other planet has anywhere near such a tilt.
[13] A needle or a pin floats on the surface of water because of –
A.
Surface tension
B.
Surface energy
C.
Viscosity
D.
Adhesive force
Ans:
Surface tension
Explanation :
The pin or needle floats because of an invisible elastic skin on the surface of the water. This elastic skin is called surface tension. Surface tension of the water leads to forces strong enough to support the needle's weight.
[14] An object which absorbs all colours and reflects none appears:
A.
White
B.
Grey
C.
Blue
D.
Black
Ans:
Black
Explanation :
A surface that absorbs all colours, reflecting none, is said to be black. Black is not a colour; it absorbs all the colours of the visible spectrum and reflects none of them to the eyes. White is a colour.
[15] Alfred Nobel invented -
A.
X ray
B.
Diesel Engine
C.
Dynamite
D.
Dynamo
Ans:
Dynamite
Explanation :
Alfred Nobel if Sweden invented Dynamite in 1867, X ray was invented by Wilhelm Roentgen of Germany in 1895, Diesel Engine was invented by Rudolf Diesel of Germany 1892, Dynamo was invented by Michael Faraday of England in 1831.
[16] Instrument used to study the behaviour of a vibrating siring is :
A.
Barometer
B.
Hydrometer
C.
(2) Hygrometer
D.
Sonometer
Ans:
Sonometer
Explanation :
A Sonometer is a device for demonstrating the relationship between the frequency of the sound produced by a plucked string, and the tension, length and mass per unit length of the string. These relationships are usually called Mersenne's laws after Marin Mersenne (1588-1648), who investigated and codified them.
[17] The mass of water vapour per unit volume of air is known as -
A.
relative humidity
B.
specific humidity
C.
absolute humidity
D.
variable humidity
Ans:
absolute humidity
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to .
A.
300 m
B.
30 m
C.
3 m
D.
0.3 m
Ans:
300 m
Explanation :
h = 𝐶 𝑉 = 3 × 108/106 = 300 m
[19] The oil in the wick of an oil lamp rises up due to:
A.
capillary action
B.
low viscosity of oil
C.
gravitational force
D.
pressure difference
Ans:
capillary action
Explanation :
The oil in the wick of an oil lamp rises up due to capillary action.
[20] Which of the following properties is generally found, in non-metals?'
A.
Brittleness
B.
Conductivity
C.
Ductility
D.
Malleability
Ans:
Brittleness
Explanation :
An important physical property of non metals is that they are brittle and hence cannot be beaten into sheets or drawn into wires. In other words, non-metals are non-malleable and non-ductile. Where stress is applied on non-metals, they shatter into pieces.
[21] Electrostatic precipitator is used to control –
A.
Chemical Pollutants
B.
Radio-active Pollutants
C.
Water Pollutants
D.
Air Pollutants
Ans:
Air Pollutants
Explanation :
An Electrostatic precipitator is a particulate collection device that removes particles from a flowing gas (such as air) using the force of an induced electrostatic charge. They are useful in controlling air pollutants in particulate form. They are highly efficient filtration devices that minimally impede the flow of gases through the device, and can easily remove fine particulate matter such as dust and smoke from the air stream.
[22] The Newton's First Law is also called as –
A.
Law of moments
B.
Law of inertia
C.
Law of energy
D.
Law of momentum
Ans:
Law of inertia
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it. So this law is known as the law of inertia.
[23] Hydraulic machines work under the principle of –
A.
Newton’s law
B.
Joule law
C.
Pascal’s law
D.
Floatation law
Ans:
Pascal’s law
Explanation :
Hydraulic machines work under the principal of Pascal’s law which states that the pressure in a static hydraulic fluid in a closed system is same everywhere.
[24] The scientist who first discovered that the Earth revolves round the Sun was -
A.
Newton
B.
Dalton
C.
Copernicus
D.
Einsteirn
Ans:
Copernicus
Explanation :
Nicolaus Copernicus was a Polish astronomer who put forth the theory that the Sun is at rest near the center of the Universe, and that the Earth, spinning on its axis once daily, revolves annually around the Sun.
[25] The type of minor used in automobiles to see the traffic on the rear side is –
A.
Concave
B.
Plano-Convex
C.
Plane
D.
Convex
Ans:
Convex
Explanation :
Convex mirrors are used as rear view mirrors in automobiles to see the traffic on the rear side. A convex mirror always produces an erect image of the objects. The image formed in a convex mirror is highly diminished than the object, due to which a convex mirror gives a wide field of view of the traffic behind.
Explanation :
The pin or needle floats because of an invisible elastic skin on the surface of the water. This elastic skin is called surface tension. Surface tension of the water leads to forces strong enough to support the needle's weight.
[14] An object which absorbs all colours and reflects none appears:
A.
White
B.
Grey
C.
Blue
D.
Black
Ans:
Black
Explanation :
A surface that absorbs all colours, reflecting none, is said to be black. Black is not a colour; it absorbs all the colours of the visible spectrum and reflects none of them to the eyes. White is a colour.
[15] Alfred Nobel invented -
A.
X ray
B.
Diesel Engine
C.
Dynamite
D.
Dynamo
Ans:
Dynamite
Explanation :
Alfred Nobel if Sweden invented Dynamite in 1867, X ray was invented by Wilhelm Roentgen of Germany in 1895, Diesel Engine was invented by Rudolf Diesel of Germany 1892, Dynamo was invented by Michael Faraday of England in 1831.
[16] Instrument used to study the behaviour of a vibrating siring is :
A.
Barometer
B.
Hydrometer
C.
(2) Hygrometer
D.
Sonometer
Ans:
Sonometer
Explanation :
A Sonometer is a device for demonstrating the relationship between the frequency of the sound produced by a plucked string, and the tension, length and mass per unit length of the string. These relationships are usually called Mersenne's laws after Marin Mersenne (1588-1648), who investigated and codified them.
[17] The mass of water vapour per unit volume of air is known as -
A.
relative humidity
B.
specific humidity
C.
absolute humidity
D.
variable humidity
Ans:
absolute humidity
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to .
A.
300 m
B.
30 m
C.
3 m
D.
0.3 m
Ans:
300 m
Explanation :
h = 𝐶 𝑉 = 3 × 108/106 = 300 m
[19] The oil in the wick of an oil lamp rises up due to:
A.
capillary action
B.
low viscosity of oil
C.
gravitational force
D.
pressure difference
Ans:
capillary action
Explanation :
The oil in the wick of an oil lamp rises up due to capillary action.
[20] Which of the following properties is generally found, in non-metals?'
A.
Brittleness
B.
Conductivity
C.
Ductility
D.
Malleability
Ans:
Brittleness
Explanation :
An important physical property of non metals is that they are brittle and hence cannot be beaten into sheets or drawn into wires. In other words, non-metals are non-malleable and non-ductile. Where stress is applied on non-metals, they shatter into pieces.
[21] Electrostatic precipitator is used to control –
A.
Chemical Pollutants
B.
Radio-active Pollutants
C.
Water Pollutants
D.
Air Pollutants
Ans:
Air Pollutants
Explanation :
An Electrostatic precipitator is a particulate collection device that removes particles from a flowing gas (such as air) using the force of an induced electrostatic charge. They are useful in controlling air pollutants in particulate form. They are highly efficient filtration devices that minimally impede the flow of gases through the device, and can easily remove fine particulate matter such as dust and smoke from the air stream.
[22] The Newton's First Law is also called as –
A.
Law of moments
B.
Law of inertia
C.
Law of energy
D.
Law of momentum
Ans:
Law of inertia
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it. So this law is known as the law of inertia.
[23] Hydraulic machines work under the principle of –
A.
Newton’s law
B.
Joule law
C.
Pascal’s law
D.
Floatation law
Ans:
Pascal’s law
Explanation :
Hydraulic machines work under the principal of Pascal’s law which states that the pressure in a static hydraulic fluid in a closed system is same everywhere.
[24] The scientist who first discovered that the Earth revolves round the Sun was -
A.
Newton
B.
Dalton
C.
Copernicus
D.
Einsteirn
Ans:
Copernicus
Explanation :
Nicolaus Copernicus was a Polish astronomer who put forth the theory that the Sun is at rest near the center of the Universe, and that the Earth, spinning on its axis once daily, revolves annually around the Sun.
[25] The type of minor used in automobiles to see the traffic on the rear side is –
A.
Concave
B.
Plano-Convex
C.
Plane
D.
Convex
Ans:
Convex
Explanation :
Convex mirrors are used as rear view mirrors in automobiles to see the traffic on the rear side. A convex mirror always produces an erect image of the objects. The image formed in a convex mirror is highly diminished than the object, due to which a convex mirror gives a wide field of view of the traffic behind.
Explanation :
Alfred Nobel if Sweden invented Dynamite in 1867, X ray was invented by Wilhelm Roentgen of Germany in 1895, Diesel Engine was invented by Rudolf Diesel of Germany 1892, Dynamo was invented by Michael Faraday of England in 1831.
[16] Instrument used to study the behaviour of a vibrating siring is :
A.
Barometer
B.
Hydrometer
C.
(2) Hygrometer
D.
Sonometer
Ans:
Sonometer
Explanation :
A Sonometer is a device for demonstrating the relationship between the frequency of the sound produced by a plucked string, and the tension, length and mass per unit length of the string. These relationships are usually called Mersenne's laws after Marin Mersenne (1588-1648), who investigated and codified them.
[17] The mass of water vapour per unit volume of air is known as -
A.
relative humidity
B.
specific humidity
C.
absolute humidity
D.
variable humidity
Ans:
absolute humidity
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to .
A.
300 m
B.
30 m
C.
3 m
D.
0.3 m
Ans:
300 m
Explanation :
h = 𝐶 𝑉 = 3 × 108/106 = 300 m
[19] The oil in the wick of an oil lamp rises up due to:
A.
capillary action
B.
low viscosity of oil
C.
gravitational force
D.
pressure difference
Ans:
capillary action
Explanation :
The oil in the wick of an oil lamp rises up due to capillary action.
[20] Which of the following properties is generally found, in non-metals?'
A.
Brittleness
B.
Conductivity
C.
Ductility
D.
Malleability
Ans:
Brittleness
Explanation :
An important physical property of non metals is that they are brittle and hence cannot be beaten into sheets or drawn into wires. In other words, non-metals are non-malleable and non-ductile. Where stress is applied on non-metals, they shatter into pieces.
[21] Electrostatic precipitator is used to control –
A.
Chemical Pollutants
B.
Radio-active Pollutants
C.
Water Pollutants
D.
Air Pollutants
Ans:
Air Pollutants
Explanation :
An Electrostatic precipitator is a particulate collection device that removes particles from a flowing gas (such as air) using the force of an induced electrostatic charge. They are useful in controlling air pollutants in particulate form. They are highly efficient filtration devices that minimally impede the flow of gases through the device, and can easily remove fine particulate matter such as dust and smoke from the air stream.
[22] The Newton's First Law is also called as –
A.
Law of moments
B.
Law of inertia
C.
Law of energy
D.
Law of momentum
Ans:
Law of inertia
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it. So this law is known as the law of inertia.
[23] Hydraulic machines work under the principle of –
A.
Newton’s law
B.
Joule law
C.
Pascal’s law
D.
Floatation law
Ans:
Pascal’s law
Explanation :
Hydraulic machines work under the principal of Pascal’s law which states that the pressure in a static hydraulic fluid in a closed system is same everywhere.
[24] The scientist who first discovered that the Earth revolves round the Sun was -
A.
Newton
B.
Dalton
C.
Copernicus
D.
Einsteirn
Ans:
Copernicus
Explanation :
Nicolaus Copernicus was a Polish astronomer who put forth the theory that the Sun is at rest near the center of the Universe, and that the Earth, spinning on its axis once daily, revolves annually around the Sun.
[25] The type of minor used in automobiles to see the traffic on the rear side is –
A.
Concave
B.
Plano-Convex
C.
Plane
D.
Convex
Ans:
Convex
Explanation :
Convex mirrors are used as rear view mirrors in automobiles to see the traffic on the rear side. A convex mirror always produces an erect image of the objects. The image formed in a convex mirror is highly diminished than the object, due to which a convex mirror gives a wide field of view of the traffic behind.
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to .
A.
300 m
B.
30 m
C.
3 m
D.
0.3 m
Ans:
300 m
Explanation :
h = 𝐶 𝑉 = 3 × 108/106 = 300 m
[19] The oil in the wick of an oil lamp rises up due to:
A.
capillary action
B.
low viscosity of oil
C.
gravitational force
D.
pressure difference
Ans:
capillary action
Explanation :
The oil in the wick of an oil lamp rises up due to capillary action.
[20] Which of the following properties is generally found, in non-metals?'
A.
Brittleness
B.
Conductivity
C.
Ductility
D.
Malleability
Ans:
Brittleness
Explanation :
An important physical property of non metals is that they are brittle and hence cannot be beaten into sheets or drawn into wires. In other words, non-metals are non-malleable and non-ductile. Where stress is applied on non-metals, they shatter into pieces.
[21] Electrostatic precipitator is used to control –
A.
Chemical Pollutants
B.
Radio-active Pollutants
C.
Water Pollutants
D.
Air Pollutants
Ans:
Air Pollutants
Explanation :
An Electrostatic precipitator is a particulate collection device that removes particles from a flowing gas (such as air) using the force of an induced electrostatic charge. They are useful in controlling air pollutants in particulate form. They are highly efficient filtration devices that minimally impede the flow of gases through the device, and can easily remove fine particulate matter such as dust and smoke from the air stream.
[22] The Newton's First Law is also called as –
A.
Law of moments
B.
Law of inertia
C.
Law of energy
D.
Law of momentum
Ans:
Law of inertia
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it. So this law is known as the law of inertia.
[23] Hydraulic machines work under the principle of –
A.
Newton’s law
B.
Joule law
C.
Pascal’s law
D.
Floatation law
Ans:
Pascal’s law
Explanation :
Hydraulic machines work under the principal of Pascal’s law which states that the pressure in a static hydraulic fluid in a closed system is same everywhere.
[24] The scientist who first discovered that the Earth revolves round the Sun was -
A.
Newton
B.
Dalton
C.
Copernicus
D.
Einsteirn
Ans:
Copernicus
Explanation :
Nicolaus Copernicus was a Polish astronomer who put forth the theory that the Sun is at rest near the center of the Universe, and that the Earth, spinning on its axis once daily, revolves annually around the Sun.
[25] The type of minor used in automobiles to see the traffic on the rear side is –
A.
Concave
B.
Plano-Convex
C.
Plane
D.
Convex
Ans:
Convex
Explanation :
Convex mirrors are used as rear view mirrors in automobiles to see the traffic on the rear side. A convex mirror always produces an erect image of the objects. The image formed in a convex mirror is highly diminished than the object, due to which a convex mirror gives a wide field of view of the traffic behind.
Explanation :
The oil in the wick of an oil lamp rises up due to capillary action.
[20] Which of the following properties is generally found, in non-metals?'
A.
Brittleness
B.
Conductivity
C.
Ductility
D.
Malleability
Ans:
Brittleness
Explanation :
An important physical property of non metals is that they are brittle and hence cannot be beaten into sheets or drawn into wires. In other words, non-metals are non-malleable and non-ductile. Where stress is applied on non-metals, they shatter into pieces.
[21] Electrostatic precipitator is used to control –
A.
Chemical Pollutants
B.
Radio-active Pollutants
C.
Water Pollutants
D.
Air Pollutants
Ans:
Air Pollutants
Explanation :
An Electrostatic precipitator is a particulate collection device that removes particles from a flowing gas (such as air) using the force of an induced electrostatic charge. They are useful in controlling air pollutants in particulate form. They are highly efficient filtration devices that minimally impede the flow of gases through the device, and can easily remove fine particulate matter such as dust and smoke from the air stream.
[22] The Newton's First Law is also called as –
A.
Law of moments
B.
Law of inertia
C.
Law of energy
D.
Law of momentum
Ans:
Law of inertia
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it. So this law is known as the law of inertia.
[23] Hydraulic machines work under the principle of –
A.
Newton’s law
B.
Joule law
C.
Pascal’s law
D.
Floatation law
Ans:
Pascal’s law
Explanation :
Hydraulic machines work under the principal of Pascal’s law which states that the pressure in a static hydraulic fluid in a closed system is same everywhere.
[24] The scientist who first discovered that the Earth revolves round the Sun was -
A.
Newton
B.
Dalton
C.
Copernicus
D.
Einsteirn
Ans:
Copernicus
Explanation :
Nicolaus Copernicus was a Polish astronomer who put forth the theory that the Sun is at rest near the center of the Universe, and that the Earth, spinning on its axis once daily, revolves annually around the Sun.
[25] The type of minor used in automobiles to see the traffic on the rear side is –
A.
Concave
B.
Plano-Convex
C.
Plane
D.
Convex
Ans:
Convex
Explanation :
Convex mirrors are used as rear view mirrors in automobiles to see the traffic on the rear side. A convex mirror always produces an erect image of the objects. The image formed in a convex mirror is highly diminished than the object, due to which a convex mirror gives a wide field of view of the traffic behind.
Explanation :
An Electrostatic precipitator is a particulate collection device that removes particles from a flowing gas (such as air) using the force of an induced electrostatic charge. They are useful in controlling air pollutants in particulate form. They are highly efficient filtration devices that minimally impede the flow of gases through the device, and can easily remove fine particulate matter such as dust and smoke from the air stream.
[22] The Newton's First Law is also called as –
A.
Law of moments
B.
Law of inertia
C.
Law of energy
D.
Law of momentum
Ans:
Law of inertia
Explanation :
According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it. So this law is known as the law of inertia.
[23] Hydraulic machines work under the principle of –
A.
Newton’s law
B.
Joule law
C.
Pascal’s law
D.
Floatation law
Ans:
Pascal’s law
Explanation :
Hydraulic machines work under the principal of Pascal’s law which states that the pressure in a static hydraulic fluid in a closed system is same everywhere.
[24] The scientist who first discovered that the Earth revolves round the Sun was -
A.
Newton
B.
Dalton
C.
Copernicus
D.
Einsteirn
Ans:
Copernicus
Explanation :
Nicolaus Copernicus was a Polish astronomer who put forth the theory that the Sun is at rest near the center of the Universe, and that the Earth, spinning on its axis once daily, revolves annually around the Sun.
[25] The type of minor used in automobiles to see the traffic on the rear side is –
A.
Concave
B.
Plano-Convex
C.
Plane
D.
Convex
Ans:
Convex
Explanation :
Convex mirrors are used as rear view mirrors in automobiles to see the traffic on the rear side. A convex mirror always produces an erect image of the objects. The image formed in a convex mirror is highly diminished than the object, due to which a convex mirror gives a wide field of view of the traffic behind.
Explanation :
Hydraulic machines work under the principal of Pascal’s law which states that the pressure in a static hydraulic fluid in a closed system is same everywhere.
[24] The scientist who first discovered that the Earth revolves round the Sun was -
A.
Newton
B.
Dalton
C.
Copernicus
D.
Einsteirn
Ans:
Copernicus
Explanation :
Nicolaus Copernicus was a Polish astronomer who put forth the theory that the Sun is at rest near the center of the Universe, and that the Earth, spinning on its axis once daily, revolves annually around the Sun.
[25] The type of minor used in automobiles to see the traffic on the rear side is –
A.
Concave
B.
Plano-Convex
C.
Plane
D.
Convex
Ans:
Convex
Explanation :
Convex mirrors are used as rear view mirrors in automobiles to see the traffic on the rear side. A convex mirror always produces an erect image of the objects. The image formed in a convex mirror is highly diminished than the object, due to which a convex mirror gives a wide field of view of the traffic behind.
Explanation :
Convex mirrors are used as rear view mirrors in automobiles to see the traffic on the rear side. A convex mirror always produces an erect image of the objects. The image formed in a convex mirror is highly diminished than the object, due to which a convex mirror gives a wide field of view of the traffic behind.