[1] An ice block with a piece of lead embedded in it floats in water. If ice melts the water level –
A.
Rises
B.
Falls
C.
Remains same
D.
Falls first and them rises
Ans:
Falls
Explanation :
If r1 is the density of the lead piece of volume v, the volume of water displaced by the ice block and the lead piece while floating is Vw = (V–v) r1 + v r1. When the ice melts, the lead piece sinks in water since r1 is greater than the density of water. The water produced by the melted ice has the volume (V-v) r1 and the volume displaced by the lead piece is v. So, the total volume of the water produced by ice and that displaced by the lead piece is V w1 = (V–v) r1+ v r1< V w. So, the water level goes down.
[2] A particle dropped from the top of a tower uniformly falls on ground at a distance which is equal to the height of tower. Which of the following paths will be traversed by the particle?
A.
Circle
B.
Parabolic
C.
Great circle
D.
Hyper-parabolic
Ans:
Parabolic
Explanation :
If a particle dropped from the top of a tower uniformly falls on ground at a distance which is equal to the height of tower then a parabolic path will be traversed by a particle because when the particle is dropped that point is called the point of projection and when it reaches the ground that point is called the point of impact.
[3] The frequency of ultrasound wave is typically –
A.
Above 20 kHz
B.
Above 20,000 kHz
C.
Below 20 kHz
D.
Below 02 kHz
Ans:
Below 20 kHz
Explanation :
Ultrasound is a cyclic sound pressure wave with a frequency greater than the upper limit of the human hearing range. Ultrasound is thus not separated from "normal" (audible) sound based on differences in physical properties, only the fact that humans cannot hear it. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy, young adults. Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz.
[4] Intensity of gravitational field of earth is maximum at –
A.
Poles
B.
Equator
C.
Centre of earth
D.
Surface
Ans:
Poles
Explanation :
A perfect sphere of spherically uniform density (density varies solely with distance from centre) would produce a gravitational field of uniform magnitude at all points on its surface, always pointing directly towards the sphere’s centre. However, the Earth deviates slightly from this ideal, and there are consequently slight deviations in both the magnitude and direction of gravity across its surface. Furthermore, the net force exerted on an object due to the Earth, called “effective gravity” or “apparent gravity”, varies due to the presence of other factors, such as inertial response to the Earth’s rotation. A scale or plumb bob measures only this effective gravity. The major reason for the difference in gravity at different latitudes is that the Earth’s equatorial bulge (itself also caused by inertia) causes objects at the Equator to be farther from the planet’s centre than objects at the poles. Because the force due to gravitational attraction between two bodies (the Earth and the object being weighed) varies inversely with the square of the distance between them, an object at the Equator experiences a weaker gravitational pull than an object at the poles.
[5] The spokes used in the wheel of a bicycle increase its –
A.
Moment of inertia
B.
Velocity
C.
Acceleration
D.
Momentum
Ans:
Moment of inertia
Explanation :
A spoke is one of some number of rods radiating from the center of a wheel (the hub where the axle connects), connecting the hub with the round traction surface. Since bicycle and wheelchair wheel spokes are only in tension, flexible and strong materials such as synthetic fibers, are also occasionally used. Metal spokes used in bicycles also increase the moment of inertia.
[6] A soap bubble shows colours when illuminated with white light. This is due to –
A.
Diffraction
B.
Polarization
C.
Interference
D.
Reflection
Ans:
Interference
Explanation :
The iridescent colours of soap bubbles are caused by interfering of (internally and externally) reflected light waves and are determined by the thickness of the film. This phenomenon is not the same as the origin of rainbow colours (caused by the refraction of internally reflected light), but rather are the same as the phenomenon causing the colours in an oil slick on a wet road.
[7] A boy sitting in an open car moving with the constant speed throws a ball straight up into the air. The ball falls –
A.
Behind him
B.
In front of him
C.
Into his hand
D.
By his side
Ans:
Behind him
Explanation :
The moment ball is thrown, it is moving with the velocity of the car. According to the inertia of motion it will continue to move in the same direction with the same velocity. As the ball is moving up and the down it will maintain its forward motion but practically it is not possible to neglect the resistance caused by air friction. So, the ball will fall behind him.
[8] The process involved in making soap is –
A.
Saponification
B.
Hydrolysis
C.
Condensation
D.
Polymerization
Ans:
Saponification
Explanation :
Saponification is a process that produces soap, usually from fats and lye. In technical teens, saponification involves base (usually caustic soda NaOH) hydrolysis of triglycerides, which are esters of fatty acids, to form the sodium salt of a carboxylate. In addition to soap, such traditional saponification processes produces glycerol.
[9] A pond of water appears less deep due to –
A.
Reflection
B.
Diffraction
C.
Refraction
D.
Polarization
Ans:
Refraction
Explanation :
The apparent depth will look less that its real depth due to the refraction of light. First of all, imagine an object at the bottom of the pond, emitting three beams of light: one straight to the centre of your eye, one above your eye, and one below. Now, as light travels faster in air than it does in water, it will accelerate as it breaks the surface, at which point it bends away from the 'normal' - the imaginary line perpendicular to the surface. So back to those three beams, the one coming straight at your eye, and as such perfectly vertical, will not bend one way or another as it leaves the water.
[10] The oldest type of energy known to man is –
A.
Wind power
B.
Solar power
C.
Tidal energy
D.
Geothermal energy
Ans:
Geothermal energy
Explanation :
The oldest energy known to man is Geothermal energy. This geothermal energy originates from the original formation of the planet, from radioactive decay of minerals, and from solar energy absorbed at the surface. It has been used for space heating and bathing since ancient Roman times, but is now better known for generating electricity. Geothermal energy is thermal energy generated and stored in the Earth.
[11] The source of the sun's energy is the process of –
A.
Photoelectric emission
B.
Nuclear fission
C.
Nuclear fusion
D.
Thermionic emission
Ans:
Nuclear fusion
Explanation :
The Sun formed about 4.6 billion years ago from the gravitational collapse of a region within a large molecular cloud. Most of the matter gathered in the center, while the rest flattened into an orbiting disk that would become the Solar System. The central mass became increasingly hot and dense, eventually initiating thermonuclear fusion in its core. It is thought that almost all other stars form by this process.
[12] A multimeter is used to measure –
A.
current
B.
voltage
C.
resistance
D.
All of the above
Ans:
All of the above
Explanation :
A multimeter or a multitester, also known as a VOM (Volt-Ohm meter), is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter may include features such as the ability to measure voltage, current and resistance. Multimeters may use analog or digital circuits—analog multimeters (AMM) and digital multimeters (often abbreviated DMM or DVOM.)
[13] In the atmosphere ultraviolet rays are absorbed by –
A.
Oxygen
B.
Nitrogen
C.
Ozone
D.
Helium
Ans:
Oxygen
Explanation :
Most of the ultraviolet radiation in sunlight is absorbed by oxygen in Earth's atmosphere, which forms the ozone layer of the lower stratosphere. UV light is found in sunlight (where it constitutes about 10% of the energy in vacuum) and is emitted by electric arcs and specialized lights such as black lights. It can cause chemical reactions, and causes many substances to glow or fluoresce. Most ultraviolet is classified as non-ionizing radiation.
[14] Which of the following metals is used for the manufacture of heating elements provided in electric iron?
A.
Nickel
B.
Chromium
C.
Nichrome
D.
Tungsten
Ans:
Nichrome
Explanation :
Nichrome is the most common domestic heating element and is found in many household products. Commonly, items such as toasters, hair dryers and heaters use nichrome coils to pass electricity and give off heat. Nichrome is made of 80 percent nickel and 20 percent chromium, and its high melting point of 1,400 degrees Celsius.
[15] When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is clue to the phenomenon of –
A.
evaporation
B.
vaporisation
C.
diffusion
D.
sublimation
Ans:
diffusion
Explanation :
Diffusion is one of several transport phenomena that occur in nature. A distinguishing feature of diffusion is that it results in mixing or mass transport without requiring bulk motion. Thus, diffusion should not be confused with convection or advection, which are other transport mechanisms that use bulk motion to move particles from One place to another.
[16] Clear nights are colder than cloudy nights because of –
A.
conduction
B.
condensation
C.
radiation
D.
insolation
Ans:
radiation
Explanation :
Cloudless nights are colder because the nights that have clouds provide a blanket for the earth and trap some of the hot day air where as the cloudless nights have no protection so all the hot air rises up into the sky. radiation is a process in which energetic particles or energetic waves travel through vacuum, or through matter-containing media that are not required for their propagation. Waves of a massive medium itself, such as water waves or sound waves, are usually not considered to be forms of “radiation” in this sense. By contrast, gravitational waves, which are waves of space-time itself, qualify as a type of radiation.
[17] In AC circuits, AC meters measure –
A.
mean values
B.
rms values
C.
peak values
D.
mean square values
Ans:
rms values
Explanation :
Voltages and currents for AC circuits are generally expressed as rms (root mean square) values. For a sine wave, the relationship between the peak and the rms average is: rms value = 0.707 peak value.
[18] When a light wave is reflected from a mirror, there is a change in its –
A.
frequency
B.
amplitude
C.
wavelength
D.
velocity
Ans:
amplitude
Explanation :
When a light wave is reflected from an object, it changes not only its amplitude but also its phase according to the properties of the object at a particular point. The velocity and momentum are just reversed in another direction.
[19] A body absorbs heat most if it is –
A.
black and rough
B.
black and smooth
C.
white and rough
D.
white and smooth
Ans:
black and rough
Explanation :
A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. Another property is roughness. Sand is rough and black and so it is a good absorber.
[20] Which of the following is not a vector quantity?
A.
Acceleration
B.
Electric current
C.
Force
D.
Velocity
Ans:
Electric current
Explanation :
For a physical quantity to be termed a vector quantity, having magnitude and direction is not enough.
[21] Which one of the following is used for determining the structure of crystal -
A.
Gamma rays
B.
X-rays
C.
UV rays
D.
visible light
Ans:
X-rays
Explanation :
Crystallography is the science that examines crystals which can be found everywhere in nature, from salt to snowflakes to gemstones.
[22] How many terminals do an electric cell has?
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
The metal disc is the negative terminal. All electric cells have two terminals; a positive terminal and a negative terminal.
[23] Water from soil enters into the root hairs owing to :
A.
Atmospheric pressure
B.
Capillary pressure
C.
Root pressure
D.
Osmotic pressure
Ans:
Capillary pressure
Explanation :
In plants, the transpiration stream is the uninterrupted stream of water, and other, which is taken up by the roots and, via the xylem vessels, transported to the leaves where it will eventually evaporate into the airiapoplast-interface of the substomatal cavity. It is driven in by capillary action and in some plants root pressure. The main driving factor is the difference in water potential between the soil and the substomatal cavity caused by transpiration.
[24] The unit of electrical power is –
A.
Bolt
B.
Watt
C.
Kilowatt hour
D.
Ampere
Ans:
Watt
Explanation :
Electric power is the rate at which electric energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Watt is named after the Scottish engineer James Watt who invented the Newcomen Steam Engine.
[25] The scientist who first sent electromagnetic waves to distant places is –
A.
James Clerk Maxwell
B.
Heinrich Hertz
C.
Thomas Alva Edison
D.
John Logie Baird
Ans:
Thomas Alva Edison
Explanation :
Radio is the transmission of single through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 30 kHz to 300 GHz. Those waves are called radio waves.
Explanation :
If r1 is the density of the lead piece of volume v, the volume of water displaced by the ice block and the lead piece while floating is Vw = (V–v) r1 + v r1. When the ice melts, the lead piece sinks in water since r1 is greater than the density of water. The water produced by the melted ice has the volume (V-v) r1 and the volume displaced by the lead piece is v. So, the total volume of the water produced by ice and that displaced by the lead piece is V w1 = (V–v) r1+ v r1< V w. So, the water level goes down.
[2] A particle dropped from the top of a tower uniformly falls on ground at a distance which is equal to the height of tower. Which of the following paths will be traversed by the particle?
A.
Circle
B.
Parabolic
C.
Great circle
D.
Hyper-parabolic
Ans:
Parabolic
Explanation :
If a particle dropped from the top of a tower uniformly falls on ground at a distance which is equal to the height of tower then a parabolic path will be traversed by a particle because when the particle is dropped that point is called the point of projection and when it reaches the ground that point is called the point of impact.
[3] The frequency of ultrasound wave is typically –
A.
Above 20 kHz
B.
Above 20,000 kHz
C.
Below 20 kHz
D.
Below 02 kHz
Ans:
Below 20 kHz
Explanation :
Ultrasound is a cyclic sound pressure wave with a frequency greater than the upper limit of the human hearing range. Ultrasound is thus not separated from "normal" (audible) sound based on differences in physical properties, only the fact that humans cannot hear it. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy, young adults. Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz.
[4] Intensity of gravitational field of earth is maximum at –
A.
Poles
B.
Equator
C.
Centre of earth
D.
Surface
Ans:
Poles
Explanation :
A perfect sphere of spherically uniform density (density varies solely with distance from centre) would produce a gravitational field of uniform magnitude at all points on its surface, always pointing directly towards the sphere’s centre. However, the Earth deviates slightly from this ideal, and there are consequently slight deviations in both the magnitude and direction of gravity across its surface. Furthermore, the net force exerted on an object due to the Earth, called “effective gravity” or “apparent gravity”, varies due to the presence of other factors, such as inertial response to the Earth’s rotation. A scale or plumb bob measures only this effective gravity. The major reason for the difference in gravity at different latitudes is that the Earth’s equatorial bulge (itself also caused by inertia) causes objects at the Equator to be farther from the planet’s centre than objects at the poles. Because the force due to gravitational attraction between two bodies (the Earth and the object being weighed) varies inversely with the square of the distance between them, an object at the Equator experiences a weaker gravitational pull than an object at the poles.
[5] The spokes used in the wheel of a bicycle increase its –
A.
Moment of inertia
B.
Velocity
C.
Acceleration
D.
Momentum
Ans:
Moment of inertia
Explanation :
A spoke is one of some number of rods radiating from the center of a wheel (the hub where the axle connects), connecting the hub with the round traction surface. Since bicycle and wheelchair wheel spokes are only in tension, flexible and strong materials such as synthetic fibers, are also occasionally used. Metal spokes used in bicycles also increase the moment of inertia.
[6] A soap bubble shows colours when illuminated with white light. This is due to –
A.
Diffraction
B.
Polarization
C.
Interference
D.
Reflection
Ans:
Interference
Explanation :
The iridescent colours of soap bubbles are caused by interfering of (internally and externally) reflected light waves and are determined by the thickness of the film. This phenomenon is not the same as the origin of rainbow colours (caused by the refraction of internally reflected light), but rather are the same as the phenomenon causing the colours in an oil slick on a wet road.
[7] A boy sitting in an open car moving with the constant speed throws a ball straight up into the air. The ball falls –
A.
Behind him
B.
In front of him
C.
Into his hand
D.
By his side
Ans:
Behind him
Explanation :
The moment ball is thrown, it is moving with the velocity of the car. According to the inertia of motion it will continue to move in the same direction with the same velocity. As the ball is moving up and the down it will maintain its forward motion but practically it is not possible to neglect the resistance caused by air friction. So, the ball will fall behind him.
[8] The process involved in making soap is –
A.
Saponification
B.
Hydrolysis
C.
Condensation
D.
Polymerization
Ans:
Saponification
Explanation :
Saponification is a process that produces soap, usually from fats and lye. In technical teens, saponification involves base (usually caustic soda NaOH) hydrolysis of triglycerides, which are esters of fatty acids, to form the sodium salt of a carboxylate. In addition to soap, such traditional saponification processes produces glycerol.
[9] A pond of water appears less deep due to –
A.
Reflection
B.
Diffraction
C.
Refraction
D.
Polarization
Ans:
Refraction
Explanation :
The apparent depth will look less that its real depth due to the refraction of light. First of all, imagine an object at the bottom of the pond, emitting three beams of light: one straight to the centre of your eye, one above your eye, and one below. Now, as light travels faster in air than it does in water, it will accelerate as it breaks the surface, at which point it bends away from the 'normal' - the imaginary line perpendicular to the surface. So back to those three beams, the one coming straight at your eye, and as such perfectly vertical, will not bend one way or another as it leaves the water.
[10] The oldest type of energy known to man is –
A.
Wind power
B.
Solar power
C.
Tidal energy
D.
Geothermal energy
Ans:
Geothermal energy
Explanation :
The oldest energy known to man is Geothermal energy. This geothermal energy originates from the original formation of the planet, from radioactive decay of minerals, and from solar energy absorbed at the surface. It has been used for space heating and bathing since ancient Roman times, but is now better known for generating electricity. Geothermal energy is thermal energy generated and stored in the Earth.
[11] The source of the sun's energy is the process of –
A.
Photoelectric emission
B.
Nuclear fission
C.
Nuclear fusion
D.
Thermionic emission
Ans:
Nuclear fusion
Explanation :
The Sun formed about 4.6 billion years ago from the gravitational collapse of a region within a large molecular cloud. Most of the matter gathered in the center, while the rest flattened into an orbiting disk that would become the Solar System. The central mass became increasingly hot and dense, eventually initiating thermonuclear fusion in its core. It is thought that almost all other stars form by this process.
[12] A multimeter is used to measure –
A.
current
B.
voltage
C.
resistance
D.
All of the above
Ans:
All of the above
Explanation :
A multimeter or a multitester, also known as a VOM (Volt-Ohm meter), is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter may include features such as the ability to measure voltage, current and resistance. Multimeters may use analog or digital circuits—analog multimeters (AMM) and digital multimeters (often abbreviated DMM or DVOM.)
[13] In the atmosphere ultraviolet rays are absorbed by –
A.
Oxygen
B.
Nitrogen
C.
Ozone
D.
Helium
Ans:
Oxygen
Explanation :
Most of the ultraviolet radiation in sunlight is absorbed by oxygen in Earth's atmosphere, which forms the ozone layer of the lower stratosphere. UV light is found in sunlight (where it constitutes about 10% of the energy in vacuum) and is emitted by electric arcs and specialized lights such as black lights. It can cause chemical reactions, and causes many substances to glow or fluoresce. Most ultraviolet is classified as non-ionizing radiation.
[14] Which of the following metals is used for the manufacture of heating elements provided in electric iron?
A.
Nickel
B.
Chromium
C.
Nichrome
D.
Tungsten
Ans:
Nichrome
Explanation :
Nichrome is the most common domestic heating element and is found in many household products. Commonly, items such as toasters, hair dryers and heaters use nichrome coils to pass electricity and give off heat. Nichrome is made of 80 percent nickel and 20 percent chromium, and its high melting point of 1,400 degrees Celsius.
[15] When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is clue to the phenomenon of –
A.
evaporation
B.
vaporisation
C.
diffusion
D.
sublimation
Ans:
diffusion
Explanation :
Diffusion is one of several transport phenomena that occur in nature. A distinguishing feature of diffusion is that it results in mixing or mass transport without requiring bulk motion. Thus, diffusion should not be confused with convection or advection, which are other transport mechanisms that use bulk motion to move particles from One place to another.
[16] Clear nights are colder than cloudy nights because of –
A.
conduction
B.
condensation
C.
radiation
D.
insolation
Ans:
radiation
Explanation :
Cloudless nights are colder because the nights that have clouds provide a blanket for the earth and trap some of the hot day air where as the cloudless nights have no protection so all the hot air rises up into the sky. radiation is a process in which energetic particles or energetic waves travel through vacuum, or through matter-containing media that are not required for their propagation. Waves of a massive medium itself, such as water waves or sound waves, are usually not considered to be forms of “radiation” in this sense. By contrast, gravitational waves, which are waves of space-time itself, qualify as a type of radiation.
[17] In AC circuits, AC meters measure –
A.
mean values
B.
rms values
C.
peak values
D.
mean square values
Ans:
rms values
Explanation :
Voltages and currents for AC circuits are generally expressed as rms (root mean square) values. For a sine wave, the relationship between the peak and the rms average is: rms value = 0.707 peak value.
[18] When a light wave is reflected from a mirror, there is a change in its –
A.
frequency
B.
amplitude
C.
wavelength
D.
velocity
Ans:
amplitude
Explanation :
When a light wave is reflected from an object, it changes not only its amplitude but also its phase according to the properties of the object at a particular point. The velocity and momentum are just reversed in another direction.
[19] A body absorbs heat most if it is –
A.
black and rough
B.
black and smooth
C.
white and rough
D.
white and smooth
Ans:
black and rough
Explanation :
A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. Another property is roughness. Sand is rough and black and so it is a good absorber.
[20] Which of the following is not a vector quantity?
A.
Acceleration
B.
Electric current
C.
Force
D.
Velocity
Ans:
Electric current
Explanation :
For a physical quantity to be termed a vector quantity, having magnitude and direction is not enough.
[21] Which one of the following is used for determining the structure of crystal -
A.
Gamma rays
B.
X-rays
C.
UV rays
D.
visible light
Ans:
X-rays
Explanation :
Crystallography is the science that examines crystals which can be found everywhere in nature, from salt to snowflakes to gemstones.
[22] How many terminals do an electric cell has?
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
The metal disc is the negative terminal. All electric cells have two terminals; a positive terminal and a negative terminal.
[23] Water from soil enters into the root hairs owing to :
A.
Atmospheric pressure
B.
Capillary pressure
C.
Root pressure
D.
Osmotic pressure
Ans:
Capillary pressure
Explanation :
In plants, the transpiration stream is the uninterrupted stream of water, and other, which is taken up by the roots and, via the xylem vessels, transported to the leaves where it will eventually evaporate into the airiapoplast-interface of the substomatal cavity. It is driven in by capillary action and in some plants root pressure. The main driving factor is the difference in water potential between the soil and the substomatal cavity caused by transpiration.
[24] The unit of electrical power is –
A.
Bolt
B.
Watt
C.
Kilowatt hour
D.
Ampere
Ans:
Watt
Explanation :
Electric power is the rate at which electric energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Watt is named after the Scottish engineer James Watt who invented the Newcomen Steam Engine.
[25] The scientist who first sent electromagnetic waves to distant places is –
A.
James Clerk Maxwell
B.
Heinrich Hertz
C.
Thomas Alva Edison
D.
John Logie Baird
Ans:
Thomas Alva Edison
Explanation :
Radio is the transmission of single through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 30 kHz to 300 GHz. Those waves are called radio waves.
Explanation :
Ultrasound is a cyclic sound pressure wave with a frequency greater than the upper limit of the human hearing range. Ultrasound is thus not separated from "normal" (audible) sound based on differences in physical properties, only the fact that humans cannot hear it. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy, young adults. Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz.
[4] Intensity of gravitational field of earth is maximum at –
A.
Poles
B.
Equator
C.
Centre of earth
D.
Surface
Ans:
Poles
Explanation :
A perfect sphere of spherically uniform density (density varies solely with distance from centre) would produce a gravitational field of uniform magnitude at all points on its surface, always pointing directly towards the sphere’s centre. However, the Earth deviates slightly from this ideal, and there are consequently slight deviations in both the magnitude and direction of gravity across its surface. Furthermore, the net force exerted on an object due to the Earth, called “effective gravity” or “apparent gravity”, varies due to the presence of other factors, such as inertial response to the Earth’s rotation. A scale or plumb bob measures only this effective gravity. The major reason for the difference in gravity at different latitudes is that the Earth’s equatorial bulge (itself also caused by inertia) causes objects at the Equator to be farther from the planet’s centre than objects at the poles. Because the force due to gravitational attraction between two bodies (the Earth and the object being weighed) varies inversely with the square of the distance between them, an object at the Equator experiences a weaker gravitational pull than an object at the poles.
[5] The spokes used in the wheel of a bicycle increase its –
A.
Moment of inertia
B.
Velocity
C.
Acceleration
D.
Momentum
Ans:
Moment of inertia
Explanation :
A spoke is one of some number of rods radiating from the center of a wheel (the hub where the axle connects), connecting the hub with the round traction surface. Since bicycle and wheelchair wheel spokes are only in tension, flexible and strong materials such as synthetic fibers, are also occasionally used. Metal spokes used in bicycles also increase the moment of inertia.
[6] A soap bubble shows colours when illuminated with white light. This is due to –
A.
Diffraction
B.
Polarization
C.
Interference
D.
Reflection
Ans:
Interference
Explanation :
The iridescent colours of soap bubbles are caused by interfering of (internally and externally) reflected light waves and are determined by the thickness of the film. This phenomenon is not the same as the origin of rainbow colours (caused by the refraction of internally reflected light), but rather are the same as the phenomenon causing the colours in an oil slick on a wet road.
[7] A boy sitting in an open car moving with the constant speed throws a ball straight up into the air. The ball falls –
A.
Behind him
B.
In front of him
C.
Into his hand
D.
By his side
Ans:
Behind him
Explanation :
The moment ball is thrown, it is moving with the velocity of the car. According to the inertia of motion it will continue to move in the same direction with the same velocity. As the ball is moving up and the down it will maintain its forward motion but practically it is not possible to neglect the resistance caused by air friction. So, the ball will fall behind him.
[8] The process involved in making soap is –
A.
Saponification
B.
Hydrolysis
C.
Condensation
D.
Polymerization
Ans:
Saponification
Explanation :
Saponification is a process that produces soap, usually from fats and lye. In technical teens, saponification involves base (usually caustic soda NaOH) hydrolysis of triglycerides, which are esters of fatty acids, to form the sodium salt of a carboxylate. In addition to soap, such traditional saponification processes produces glycerol.
[9] A pond of water appears less deep due to –
A.
Reflection
B.
Diffraction
C.
Refraction
D.
Polarization
Ans:
Refraction
Explanation :
The apparent depth will look less that its real depth due to the refraction of light. First of all, imagine an object at the bottom of the pond, emitting three beams of light: one straight to the centre of your eye, one above your eye, and one below. Now, as light travels faster in air than it does in water, it will accelerate as it breaks the surface, at which point it bends away from the 'normal' - the imaginary line perpendicular to the surface. So back to those three beams, the one coming straight at your eye, and as such perfectly vertical, will not bend one way or another as it leaves the water.
[10] The oldest type of energy known to man is –
A.
Wind power
B.
Solar power
C.
Tidal energy
D.
Geothermal energy
Ans:
Geothermal energy
Explanation :
The oldest energy known to man is Geothermal energy. This geothermal energy originates from the original formation of the planet, from radioactive decay of minerals, and from solar energy absorbed at the surface. It has been used for space heating and bathing since ancient Roman times, but is now better known for generating electricity. Geothermal energy is thermal energy generated and stored in the Earth.
[11] The source of the sun's energy is the process of –
A.
Photoelectric emission
B.
Nuclear fission
C.
Nuclear fusion
D.
Thermionic emission
Ans:
Nuclear fusion
Explanation :
The Sun formed about 4.6 billion years ago from the gravitational collapse of a region within a large molecular cloud. Most of the matter gathered in the center, while the rest flattened into an orbiting disk that would become the Solar System. The central mass became increasingly hot and dense, eventually initiating thermonuclear fusion in its core. It is thought that almost all other stars form by this process.
[12] A multimeter is used to measure –
A.
current
B.
voltage
C.
resistance
D.
All of the above
Ans:
All of the above
Explanation :
A multimeter or a multitester, also known as a VOM (Volt-Ohm meter), is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter may include features such as the ability to measure voltage, current and resistance. Multimeters may use analog or digital circuits—analog multimeters (AMM) and digital multimeters (often abbreviated DMM or DVOM.)
[13] In the atmosphere ultraviolet rays are absorbed by –
A.
Oxygen
B.
Nitrogen
C.
Ozone
D.
Helium
Ans:
Oxygen
Explanation :
Most of the ultraviolet radiation in sunlight is absorbed by oxygen in Earth's atmosphere, which forms the ozone layer of the lower stratosphere. UV light is found in sunlight (where it constitutes about 10% of the energy in vacuum) and is emitted by electric arcs and specialized lights such as black lights. It can cause chemical reactions, and causes many substances to glow or fluoresce. Most ultraviolet is classified as non-ionizing radiation.
[14] Which of the following metals is used for the manufacture of heating elements provided in electric iron?
A.
Nickel
B.
Chromium
C.
Nichrome
D.
Tungsten
Ans:
Nichrome
Explanation :
Nichrome is the most common domestic heating element and is found in many household products. Commonly, items such as toasters, hair dryers and heaters use nichrome coils to pass electricity and give off heat. Nichrome is made of 80 percent nickel and 20 percent chromium, and its high melting point of 1,400 degrees Celsius.
[15] When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is clue to the phenomenon of –
A.
evaporation
B.
vaporisation
C.
diffusion
D.
sublimation
Ans:
diffusion
Explanation :
Diffusion is one of several transport phenomena that occur in nature. A distinguishing feature of diffusion is that it results in mixing or mass transport without requiring bulk motion. Thus, diffusion should not be confused with convection or advection, which are other transport mechanisms that use bulk motion to move particles from One place to another.
[16] Clear nights are colder than cloudy nights because of –
A.
conduction
B.
condensation
C.
radiation
D.
insolation
Ans:
radiation
Explanation :
Cloudless nights are colder because the nights that have clouds provide a blanket for the earth and trap some of the hot day air where as the cloudless nights have no protection so all the hot air rises up into the sky. radiation is a process in which energetic particles or energetic waves travel through vacuum, or through matter-containing media that are not required for their propagation. Waves of a massive medium itself, such as water waves or sound waves, are usually not considered to be forms of “radiation” in this sense. By contrast, gravitational waves, which are waves of space-time itself, qualify as a type of radiation.
[17] In AC circuits, AC meters measure –
A.
mean values
B.
rms values
C.
peak values
D.
mean square values
Ans:
rms values
Explanation :
Voltages and currents for AC circuits are generally expressed as rms (root mean square) values. For a sine wave, the relationship between the peak and the rms average is: rms value = 0.707 peak value.
[18] When a light wave is reflected from a mirror, there is a change in its –
A.
frequency
B.
amplitude
C.
wavelength
D.
velocity
Ans:
amplitude
Explanation :
When a light wave is reflected from an object, it changes not only its amplitude but also its phase according to the properties of the object at a particular point. The velocity and momentum are just reversed in another direction.
[19] A body absorbs heat most if it is –
A.
black and rough
B.
black and smooth
C.
white and rough
D.
white and smooth
Ans:
black and rough
Explanation :
A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. Another property is roughness. Sand is rough and black and so it is a good absorber.
[20] Which of the following is not a vector quantity?
A.
Acceleration
B.
Electric current
C.
Force
D.
Velocity
Ans:
Electric current
Explanation :
For a physical quantity to be termed a vector quantity, having magnitude and direction is not enough.
[21] Which one of the following is used for determining the structure of crystal -
A.
Gamma rays
B.
X-rays
C.
UV rays
D.
visible light
Ans:
X-rays
Explanation :
Crystallography is the science that examines crystals which can be found everywhere in nature, from salt to snowflakes to gemstones.
[22] How many terminals do an electric cell has?
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
The metal disc is the negative terminal. All electric cells have two terminals; a positive terminal and a negative terminal.
[23] Water from soil enters into the root hairs owing to :
A.
Atmospheric pressure
B.
Capillary pressure
C.
Root pressure
D.
Osmotic pressure
Ans:
Capillary pressure
Explanation :
In plants, the transpiration stream is the uninterrupted stream of water, and other, which is taken up by the roots and, via the xylem vessels, transported to the leaves where it will eventually evaporate into the airiapoplast-interface of the substomatal cavity. It is driven in by capillary action and in some plants root pressure. The main driving factor is the difference in water potential between the soil and the substomatal cavity caused by transpiration.
[24] The unit of electrical power is –
A.
Bolt
B.
Watt
C.
Kilowatt hour
D.
Ampere
Ans:
Watt
Explanation :
Electric power is the rate at which electric energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Watt is named after the Scottish engineer James Watt who invented the Newcomen Steam Engine.
[25] The scientist who first sent electromagnetic waves to distant places is –
A.
James Clerk Maxwell
B.
Heinrich Hertz
C.
Thomas Alva Edison
D.
John Logie Baird
Ans:
Thomas Alva Edison
Explanation :
Radio is the transmission of single through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 30 kHz to 300 GHz. Those waves are called radio waves.
Explanation :
A spoke is one of some number of rods radiating from the center of a wheel (the hub where the axle connects), connecting the hub with the round traction surface. Since bicycle and wheelchair wheel spokes are only in tension, flexible and strong materials such as synthetic fibers, are also occasionally used. Metal spokes used in bicycles also increase the moment of inertia.
[6] A soap bubble shows colours when illuminated with white light. This is due to –
A.
Diffraction
B.
Polarization
C.
Interference
D.
Reflection
Ans:
Interference
Explanation :
The iridescent colours of soap bubbles are caused by interfering of (internally and externally) reflected light waves and are determined by the thickness of the film. This phenomenon is not the same as the origin of rainbow colours (caused by the refraction of internally reflected light), but rather are the same as the phenomenon causing the colours in an oil slick on a wet road.
[7] A boy sitting in an open car moving with the constant speed throws a ball straight up into the air. The ball falls –
A.
Behind him
B.
In front of him
C.
Into his hand
D.
By his side
Ans:
Behind him
Explanation :
The moment ball is thrown, it is moving with the velocity of the car. According to the inertia of motion it will continue to move in the same direction with the same velocity. As the ball is moving up and the down it will maintain its forward motion but practically it is not possible to neglect the resistance caused by air friction. So, the ball will fall behind him.
[8] The process involved in making soap is –
A.
Saponification
B.
Hydrolysis
C.
Condensation
D.
Polymerization
Ans:
Saponification
Explanation :
Saponification is a process that produces soap, usually from fats and lye. In technical teens, saponification involves base (usually caustic soda NaOH) hydrolysis of triglycerides, which are esters of fatty acids, to form the sodium salt of a carboxylate. In addition to soap, such traditional saponification processes produces glycerol.
[9] A pond of water appears less deep due to –
A.
Reflection
B.
Diffraction
C.
Refraction
D.
Polarization
Ans:
Refraction
Explanation :
The apparent depth will look less that its real depth due to the refraction of light. First of all, imagine an object at the bottom of the pond, emitting three beams of light: one straight to the centre of your eye, one above your eye, and one below. Now, as light travels faster in air than it does in water, it will accelerate as it breaks the surface, at which point it bends away from the 'normal' - the imaginary line perpendicular to the surface. So back to those three beams, the one coming straight at your eye, and as such perfectly vertical, will not bend one way or another as it leaves the water.
[10] The oldest type of energy known to man is –
A.
Wind power
B.
Solar power
C.
Tidal energy
D.
Geothermal energy
Ans:
Geothermal energy
Explanation :
The oldest energy known to man is Geothermal energy. This geothermal energy originates from the original formation of the planet, from radioactive decay of minerals, and from solar energy absorbed at the surface. It has been used for space heating and bathing since ancient Roman times, but is now better known for generating electricity. Geothermal energy is thermal energy generated and stored in the Earth.
[11] The source of the sun's energy is the process of –
A.
Photoelectric emission
B.
Nuclear fission
C.
Nuclear fusion
D.
Thermionic emission
Ans:
Nuclear fusion
Explanation :
The Sun formed about 4.6 billion years ago from the gravitational collapse of a region within a large molecular cloud. Most of the matter gathered in the center, while the rest flattened into an orbiting disk that would become the Solar System. The central mass became increasingly hot and dense, eventually initiating thermonuclear fusion in its core. It is thought that almost all other stars form by this process.
[12] A multimeter is used to measure –
A.
current
B.
voltage
C.
resistance
D.
All of the above
Ans:
All of the above
Explanation :
A multimeter or a multitester, also known as a VOM (Volt-Ohm meter), is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter may include features such as the ability to measure voltage, current and resistance. Multimeters may use analog or digital circuits—analog multimeters (AMM) and digital multimeters (often abbreviated DMM or DVOM.)
[13] In the atmosphere ultraviolet rays are absorbed by –
A.
Oxygen
B.
Nitrogen
C.
Ozone
D.
Helium
Ans:
Oxygen
Explanation :
Most of the ultraviolet radiation in sunlight is absorbed by oxygen in Earth's atmosphere, which forms the ozone layer of the lower stratosphere. UV light is found in sunlight (where it constitutes about 10% of the energy in vacuum) and is emitted by electric arcs and specialized lights such as black lights. It can cause chemical reactions, and causes many substances to glow or fluoresce. Most ultraviolet is classified as non-ionizing radiation.
[14] Which of the following metals is used for the manufacture of heating elements provided in electric iron?
A.
Nickel
B.
Chromium
C.
Nichrome
D.
Tungsten
Ans:
Nichrome
Explanation :
Nichrome is the most common domestic heating element and is found in many household products. Commonly, items such as toasters, hair dryers and heaters use nichrome coils to pass electricity and give off heat. Nichrome is made of 80 percent nickel and 20 percent chromium, and its high melting point of 1,400 degrees Celsius.
[15] When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is clue to the phenomenon of –
A.
evaporation
B.
vaporisation
C.
diffusion
D.
sublimation
Ans:
diffusion
Explanation :
Diffusion is one of several transport phenomena that occur in nature. A distinguishing feature of diffusion is that it results in mixing or mass transport without requiring bulk motion. Thus, diffusion should not be confused with convection or advection, which are other transport mechanisms that use bulk motion to move particles from One place to another.
[16] Clear nights are colder than cloudy nights because of –
A.
conduction
B.
condensation
C.
radiation
D.
insolation
Ans:
radiation
Explanation :
Cloudless nights are colder because the nights that have clouds provide a blanket for the earth and trap some of the hot day air where as the cloudless nights have no protection so all the hot air rises up into the sky. radiation is a process in which energetic particles or energetic waves travel through vacuum, or through matter-containing media that are not required for their propagation. Waves of a massive medium itself, such as water waves or sound waves, are usually not considered to be forms of “radiation” in this sense. By contrast, gravitational waves, which are waves of space-time itself, qualify as a type of radiation.
[17] In AC circuits, AC meters measure –
A.
mean values
B.
rms values
C.
peak values
D.
mean square values
Ans:
rms values
Explanation :
Voltages and currents for AC circuits are generally expressed as rms (root mean square) values. For a sine wave, the relationship between the peak and the rms average is: rms value = 0.707 peak value.
[18] When a light wave is reflected from a mirror, there is a change in its –
A.
frequency
B.
amplitude
C.
wavelength
D.
velocity
Ans:
amplitude
Explanation :
When a light wave is reflected from an object, it changes not only its amplitude but also its phase according to the properties of the object at a particular point. The velocity and momentum are just reversed in another direction.
[19] A body absorbs heat most if it is –
A.
black and rough
B.
black and smooth
C.
white and rough
D.
white and smooth
Ans:
black and rough
Explanation :
A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. Another property is roughness. Sand is rough and black and so it is a good absorber.
[20] Which of the following is not a vector quantity?
A.
Acceleration
B.
Electric current
C.
Force
D.
Velocity
Ans:
Electric current
Explanation :
For a physical quantity to be termed a vector quantity, having magnitude and direction is not enough.
[21] Which one of the following is used for determining the structure of crystal -
A.
Gamma rays
B.
X-rays
C.
UV rays
D.
visible light
Ans:
X-rays
Explanation :
Crystallography is the science that examines crystals which can be found everywhere in nature, from salt to snowflakes to gemstones.
[22] How many terminals do an electric cell has?
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
The metal disc is the negative terminal. All electric cells have two terminals; a positive terminal and a negative terminal.
[23] Water from soil enters into the root hairs owing to :
A.
Atmospheric pressure
B.
Capillary pressure
C.
Root pressure
D.
Osmotic pressure
Ans:
Capillary pressure
Explanation :
In plants, the transpiration stream is the uninterrupted stream of water, and other, which is taken up by the roots and, via the xylem vessels, transported to the leaves where it will eventually evaporate into the airiapoplast-interface of the substomatal cavity. It is driven in by capillary action and in some plants root pressure. The main driving factor is the difference in water potential between the soil and the substomatal cavity caused by transpiration.
[24] The unit of electrical power is –
A.
Bolt
B.
Watt
C.
Kilowatt hour
D.
Ampere
Ans:
Watt
Explanation :
Electric power is the rate at which electric energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Watt is named after the Scottish engineer James Watt who invented the Newcomen Steam Engine.
[25] The scientist who first sent electromagnetic waves to distant places is –
A.
James Clerk Maxwell
B.
Heinrich Hertz
C.
Thomas Alva Edison
D.
John Logie Baird
Ans:
Thomas Alva Edison
Explanation :
Radio is the transmission of single through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 30 kHz to 300 GHz. Those waves are called radio waves.
Explanation :
The moment ball is thrown, it is moving with the velocity of the car. According to the inertia of motion it will continue to move in the same direction with the same velocity. As the ball is moving up and the down it will maintain its forward motion but practically it is not possible to neglect the resistance caused by air friction. So, the ball will fall behind him.
[8] The process involved in making soap is –
A.
Saponification
B.
Hydrolysis
C.
Condensation
D.
Polymerization
Ans:
Saponification
Explanation :
Saponification is a process that produces soap, usually from fats and lye. In technical teens, saponification involves base (usually caustic soda NaOH) hydrolysis of triglycerides, which are esters of fatty acids, to form the sodium salt of a carboxylate. In addition to soap, such traditional saponification processes produces glycerol.
[9] A pond of water appears less deep due to –
A.
Reflection
B.
Diffraction
C.
Refraction
D.
Polarization
Ans:
Refraction
Explanation :
The apparent depth will look less that its real depth due to the refraction of light. First of all, imagine an object at the bottom of the pond, emitting three beams of light: one straight to the centre of your eye, one above your eye, and one below. Now, as light travels faster in air than it does in water, it will accelerate as it breaks the surface, at which point it bends away from the 'normal' - the imaginary line perpendicular to the surface. So back to those three beams, the one coming straight at your eye, and as such perfectly vertical, will not bend one way or another as it leaves the water.
[10] The oldest type of energy known to man is –
A.
Wind power
B.
Solar power
C.
Tidal energy
D.
Geothermal energy
Ans:
Geothermal energy
Explanation :
The oldest energy known to man is Geothermal energy. This geothermal energy originates from the original formation of the planet, from radioactive decay of minerals, and from solar energy absorbed at the surface. It has been used for space heating and bathing since ancient Roman times, but is now better known for generating electricity. Geothermal energy is thermal energy generated and stored in the Earth.
[11] The source of the sun's energy is the process of –
A.
Photoelectric emission
B.
Nuclear fission
C.
Nuclear fusion
D.
Thermionic emission
Ans:
Nuclear fusion
Explanation :
The Sun formed about 4.6 billion years ago from the gravitational collapse of a region within a large molecular cloud. Most of the matter gathered in the center, while the rest flattened into an orbiting disk that would become the Solar System. The central mass became increasingly hot and dense, eventually initiating thermonuclear fusion in its core. It is thought that almost all other stars form by this process.
[12] A multimeter is used to measure –
A.
current
B.
voltage
C.
resistance
D.
All of the above
Ans:
All of the above
Explanation :
A multimeter or a multitester, also known as a VOM (Volt-Ohm meter), is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter may include features such as the ability to measure voltage, current and resistance. Multimeters may use analog or digital circuits—analog multimeters (AMM) and digital multimeters (often abbreviated DMM or DVOM.)
[13] In the atmosphere ultraviolet rays are absorbed by –
A.
Oxygen
B.
Nitrogen
C.
Ozone
D.
Helium
Ans:
Oxygen
Explanation :
Most of the ultraviolet radiation in sunlight is absorbed by oxygen in Earth's atmosphere, which forms the ozone layer of the lower stratosphere. UV light is found in sunlight (where it constitutes about 10% of the energy in vacuum) and is emitted by electric arcs and specialized lights such as black lights. It can cause chemical reactions, and causes many substances to glow or fluoresce. Most ultraviolet is classified as non-ionizing radiation.
[14] Which of the following metals is used for the manufacture of heating elements provided in electric iron?
A.
Nickel
B.
Chromium
C.
Nichrome
D.
Tungsten
Ans:
Nichrome
Explanation :
Nichrome is the most common domestic heating element and is found in many household products. Commonly, items such as toasters, hair dryers and heaters use nichrome coils to pass electricity and give off heat. Nichrome is made of 80 percent nickel and 20 percent chromium, and its high melting point of 1,400 degrees Celsius.
[15] When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is clue to the phenomenon of –
A.
evaporation
B.
vaporisation
C.
diffusion
D.
sublimation
Ans:
diffusion
Explanation :
Diffusion is one of several transport phenomena that occur in nature. A distinguishing feature of diffusion is that it results in mixing or mass transport without requiring bulk motion. Thus, diffusion should not be confused with convection or advection, which are other transport mechanisms that use bulk motion to move particles from One place to another.
[16] Clear nights are colder than cloudy nights because of –
A.
conduction
B.
condensation
C.
radiation
D.
insolation
Ans:
radiation
Explanation :
Cloudless nights are colder because the nights that have clouds provide a blanket for the earth and trap some of the hot day air where as the cloudless nights have no protection so all the hot air rises up into the sky. radiation is a process in which energetic particles or energetic waves travel through vacuum, or through matter-containing media that are not required for their propagation. Waves of a massive medium itself, such as water waves or sound waves, are usually not considered to be forms of “radiation” in this sense. By contrast, gravitational waves, which are waves of space-time itself, qualify as a type of radiation.
[17] In AC circuits, AC meters measure –
A.
mean values
B.
rms values
C.
peak values
D.
mean square values
Ans:
rms values
Explanation :
Voltages and currents for AC circuits are generally expressed as rms (root mean square) values. For a sine wave, the relationship between the peak and the rms average is: rms value = 0.707 peak value.
[18] When a light wave is reflected from a mirror, there is a change in its –
A.
frequency
B.
amplitude
C.
wavelength
D.
velocity
Ans:
amplitude
Explanation :
When a light wave is reflected from an object, it changes not only its amplitude but also its phase according to the properties of the object at a particular point. The velocity and momentum are just reversed in another direction.
[19] A body absorbs heat most if it is –
A.
black and rough
B.
black and smooth
C.
white and rough
D.
white and smooth
Ans:
black and rough
Explanation :
A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. Another property is roughness. Sand is rough and black and so it is a good absorber.
[20] Which of the following is not a vector quantity?
A.
Acceleration
B.
Electric current
C.
Force
D.
Velocity
Ans:
Electric current
Explanation :
For a physical quantity to be termed a vector quantity, having magnitude and direction is not enough.
[21] Which one of the following is used for determining the structure of crystal -
A.
Gamma rays
B.
X-rays
C.
UV rays
D.
visible light
Ans:
X-rays
Explanation :
Crystallography is the science that examines crystals which can be found everywhere in nature, from salt to snowflakes to gemstones.
[22] How many terminals do an electric cell has?
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
The metal disc is the negative terminal. All electric cells have two terminals; a positive terminal and a negative terminal.
[23] Water from soil enters into the root hairs owing to :
A.
Atmospheric pressure
B.
Capillary pressure
C.
Root pressure
D.
Osmotic pressure
Ans:
Capillary pressure
Explanation :
In plants, the transpiration stream is the uninterrupted stream of water, and other, which is taken up by the roots and, via the xylem vessels, transported to the leaves where it will eventually evaporate into the airiapoplast-interface of the substomatal cavity. It is driven in by capillary action and in some plants root pressure. The main driving factor is the difference in water potential between the soil and the substomatal cavity caused by transpiration.
[24] The unit of electrical power is –
A.
Bolt
B.
Watt
C.
Kilowatt hour
D.
Ampere
Ans:
Watt
Explanation :
Electric power is the rate at which electric energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Watt is named after the Scottish engineer James Watt who invented the Newcomen Steam Engine.
[25] The scientist who first sent electromagnetic waves to distant places is –
A.
James Clerk Maxwell
B.
Heinrich Hertz
C.
Thomas Alva Edison
D.
John Logie Baird
Ans:
Thomas Alva Edison
Explanation :
Radio is the transmission of single through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 30 kHz to 300 GHz. Those waves are called radio waves.
Explanation :
The apparent depth will look less that its real depth due to the refraction of light. First of all, imagine an object at the bottom of the pond, emitting three beams of light: one straight to the centre of your eye, one above your eye, and one below. Now, as light travels faster in air than it does in water, it will accelerate as it breaks the surface, at which point it bends away from the 'normal' - the imaginary line perpendicular to the surface. So back to those three beams, the one coming straight at your eye, and as such perfectly vertical, will not bend one way or another as it leaves the water.
[10] The oldest type of energy known to man is –
A.
Wind power
B.
Solar power
C.
Tidal energy
D.
Geothermal energy
Ans:
Geothermal energy
Explanation :
The oldest energy known to man is Geothermal energy. This geothermal energy originates from the original formation of the planet, from radioactive decay of minerals, and from solar energy absorbed at the surface. It has been used for space heating and bathing since ancient Roman times, but is now better known for generating electricity. Geothermal energy is thermal energy generated and stored in the Earth.
[11] The source of the sun's energy is the process of –
A.
Photoelectric emission
B.
Nuclear fission
C.
Nuclear fusion
D.
Thermionic emission
Ans:
Nuclear fusion
Explanation :
The Sun formed about 4.6 billion years ago from the gravitational collapse of a region within a large molecular cloud. Most of the matter gathered in the center, while the rest flattened into an orbiting disk that would become the Solar System. The central mass became increasingly hot and dense, eventually initiating thermonuclear fusion in its core. It is thought that almost all other stars form by this process.
[12] A multimeter is used to measure –
A.
current
B.
voltage
C.
resistance
D.
All of the above
Ans:
All of the above
Explanation :
A multimeter or a multitester, also known as a VOM (Volt-Ohm meter), is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter may include features such as the ability to measure voltage, current and resistance. Multimeters may use analog or digital circuits—analog multimeters (AMM) and digital multimeters (often abbreviated DMM or DVOM.)
[13] In the atmosphere ultraviolet rays are absorbed by –
A.
Oxygen
B.
Nitrogen
C.
Ozone
D.
Helium
Ans:
Oxygen
Explanation :
Most of the ultraviolet radiation in sunlight is absorbed by oxygen in Earth's atmosphere, which forms the ozone layer of the lower stratosphere. UV light is found in sunlight (where it constitutes about 10% of the energy in vacuum) and is emitted by electric arcs and specialized lights such as black lights. It can cause chemical reactions, and causes many substances to glow or fluoresce. Most ultraviolet is classified as non-ionizing radiation.
[14] Which of the following metals is used for the manufacture of heating elements provided in electric iron?
A.
Nickel
B.
Chromium
C.
Nichrome
D.
Tungsten
Ans:
Nichrome
Explanation :
Nichrome is the most common domestic heating element and is found in many household products. Commonly, items such as toasters, hair dryers and heaters use nichrome coils to pass electricity and give off heat. Nichrome is made of 80 percent nickel and 20 percent chromium, and its high melting point of 1,400 degrees Celsius.
[15] When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is clue to the phenomenon of –
A.
evaporation
B.
vaporisation
C.
diffusion
D.
sublimation
Ans:
diffusion
Explanation :
Diffusion is one of several transport phenomena that occur in nature. A distinguishing feature of diffusion is that it results in mixing or mass transport without requiring bulk motion. Thus, diffusion should not be confused with convection or advection, which are other transport mechanisms that use bulk motion to move particles from One place to another.
[16] Clear nights are colder than cloudy nights because of –
A.
conduction
B.
condensation
C.
radiation
D.
insolation
Ans:
radiation
Explanation :
Cloudless nights are colder because the nights that have clouds provide a blanket for the earth and trap some of the hot day air where as the cloudless nights have no protection so all the hot air rises up into the sky. radiation is a process in which energetic particles or energetic waves travel through vacuum, or through matter-containing media that are not required for their propagation. Waves of a massive medium itself, such as water waves or sound waves, are usually not considered to be forms of “radiation” in this sense. By contrast, gravitational waves, which are waves of space-time itself, qualify as a type of radiation.
[17] In AC circuits, AC meters measure –
A.
mean values
B.
rms values
C.
peak values
D.
mean square values
Ans:
rms values
Explanation :
Voltages and currents for AC circuits are generally expressed as rms (root mean square) values. For a sine wave, the relationship between the peak and the rms average is: rms value = 0.707 peak value.
[18] When a light wave is reflected from a mirror, there is a change in its –
A.
frequency
B.
amplitude
C.
wavelength
D.
velocity
Ans:
amplitude
Explanation :
When a light wave is reflected from an object, it changes not only its amplitude but also its phase according to the properties of the object at a particular point. The velocity and momentum are just reversed in another direction.
[19] A body absorbs heat most if it is –
A.
black and rough
B.
black and smooth
C.
white and rough
D.
white and smooth
Ans:
black and rough
Explanation :
A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. Another property is roughness. Sand is rough and black and so it is a good absorber.
[20] Which of the following is not a vector quantity?
A.
Acceleration
B.
Electric current
C.
Force
D.
Velocity
Ans:
Electric current
Explanation :
For a physical quantity to be termed a vector quantity, having magnitude and direction is not enough.
[21] Which one of the following is used for determining the structure of crystal -
A.
Gamma rays
B.
X-rays
C.
UV rays
D.
visible light
Ans:
X-rays
Explanation :
Crystallography is the science that examines crystals which can be found everywhere in nature, from salt to snowflakes to gemstones.
[22] How many terminals do an electric cell has?
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
The metal disc is the negative terminal. All electric cells have two terminals; a positive terminal and a negative terminal.
[23] Water from soil enters into the root hairs owing to :
A.
Atmospheric pressure
B.
Capillary pressure
C.
Root pressure
D.
Osmotic pressure
Ans:
Capillary pressure
Explanation :
In plants, the transpiration stream is the uninterrupted stream of water, and other, which is taken up by the roots and, via the xylem vessels, transported to the leaves where it will eventually evaporate into the airiapoplast-interface of the substomatal cavity. It is driven in by capillary action and in some plants root pressure. The main driving factor is the difference in water potential between the soil and the substomatal cavity caused by transpiration.
[24] The unit of electrical power is –
A.
Bolt
B.
Watt
C.
Kilowatt hour
D.
Ampere
Ans:
Watt
Explanation :
Electric power is the rate at which electric energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Watt is named after the Scottish engineer James Watt who invented the Newcomen Steam Engine.
[25] The scientist who first sent electromagnetic waves to distant places is –
A.
James Clerk Maxwell
B.
Heinrich Hertz
C.
Thomas Alva Edison
D.
John Logie Baird
Ans:
Thomas Alva Edison
Explanation :
Radio is the transmission of single through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 30 kHz to 300 GHz. Those waves are called radio waves.
Explanation :
The Sun formed about 4.6 billion years ago from the gravitational collapse of a region within a large molecular cloud. Most of the matter gathered in the center, while the rest flattened into an orbiting disk that would become the Solar System. The central mass became increasingly hot and dense, eventually initiating thermonuclear fusion in its core. It is thought that almost all other stars form by this process.
[12] A multimeter is used to measure –
A.
current
B.
voltage
C.
resistance
D.
All of the above
Ans:
All of the above
Explanation :
A multimeter or a multitester, also known as a VOM (Volt-Ohm meter), is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter may include features such as the ability to measure voltage, current and resistance. Multimeters may use analog or digital circuits—analog multimeters (AMM) and digital multimeters (often abbreviated DMM or DVOM.)
[13] In the atmosphere ultraviolet rays are absorbed by –
A.
Oxygen
B.
Nitrogen
C.
Ozone
D.
Helium
Ans:
Oxygen
Explanation :
Most of the ultraviolet radiation in sunlight is absorbed by oxygen in Earth's atmosphere, which forms the ozone layer of the lower stratosphere. UV light is found in sunlight (where it constitutes about 10% of the energy in vacuum) and is emitted by electric arcs and specialized lights such as black lights. It can cause chemical reactions, and causes many substances to glow or fluoresce. Most ultraviolet is classified as non-ionizing radiation.
[14] Which of the following metals is used for the manufacture of heating elements provided in electric iron?
A.
Nickel
B.
Chromium
C.
Nichrome
D.
Tungsten
Ans:
Nichrome
Explanation :
Nichrome is the most common domestic heating element and is found in many household products. Commonly, items such as toasters, hair dryers and heaters use nichrome coils to pass electricity and give off heat. Nichrome is made of 80 percent nickel and 20 percent chromium, and its high melting point of 1,400 degrees Celsius.
[15] When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is clue to the phenomenon of –
A.
evaporation
B.
vaporisation
C.
diffusion
D.
sublimation
Ans:
diffusion
Explanation :
Diffusion is one of several transport phenomena that occur in nature. A distinguishing feature of diffusion is that it results in mixing or mass transport without requiring bulk motion. Thus, diffusion should not be confused with convection or advection, which are other transport mechanisms that use bulk motion to move particles from One place to another.
[16] Clear nights are colder than cloudy nights because of –
A.
conduction
B.
condensation
C.
radiation
D.
insolation
Ans:
radiation
Explanation :
Cloudless nights are colder because the nights that have clouds provide a blanket for the earth and trap some of the hot day air where as the cloudless nights have no protection so all the hot air rises up into the sky. radiation is a process in which energetic particles or energetic waves travel through vacuum, or through matter-containing media that are not required for their propagation. Waves of a massive medium itself, such as water waves or sound waves, are usually not considered to be forms of “radiation” in this sense. By contrast, gravitational waves, which are waves of space-time itself, qualify as a type of radiation.
[17] In AC circuits, AC meters measure –
A.
mean values
B.
rms values
C.
peak values
D.
mean square values
Ans:
rms values
Explanation :
Voltages and currents for AC circuits are generally expressed as rms (root mean square) values. For a sine wave, the relationship between the peak and the rms average is: rms value = 0.707 peak value.
[18] When a light wave is reflected from a mirror, there is a change in its –
A.
frequency
B.
amplitude
C.
wavelength
D.
velocity
Ans:
amplitude
Explanation :
When a light wave is reflected from an object, it changes not only its amplitude but also its phase according to the properties of the object at a particular point. The velocity and momentum are just reversed in another direction.
[19] A body absorbs heat most if it is –
A.
black and rough
B.
black and smooth
C.
white and rough
D.
white and smooth
Ans:
black and rough
Explanation :
A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. Another property is roughness. Sand is rough and black and so it is a good absorber.
[20] Which of the following is not a vector quantity?
A.
Acceleration
B.
Electric current
C.
Force
D.
Velocity
Ans:
Electric current
Explanation :
For a physical quantity to be termed a vector quantity, having magnitude and direction is not enough.
[21] Which one of the following is used for determining the structure of crystal -
A.
Gamma rays
B.
X-rays
C.
UV rays
D.
visible light
Ans:
X-rays
Explanation :
Crystallography is the science that examines crystals which can be found everywhere in nature, from salt to snowflakes to gemstones.
[22] How many terminals do an electric cell has?
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
The metal disc is the negative terminal. All electric cells have two terminals; a positive terminal and a negative terminal.
[23] Water from soil enters into the root hairs owing to :
A.
Atmospheric pressure
B.
Capillary pressure
C.
Root pressure
D.
Osmotic pressure
Ans:
Capillary pressure
Explanation :
In plants, the transpiration stream is the uninterrupted stream of water, and other, which is taken up by the roots and, via the xylem vessels, transported to the leaves where it will eventually evaporate into the airiapoplast-interface of the substomatal cavity. It is driven in by capillary action and in some plants root pressure. The main driving factor is the difference in water potential between the soil and the substomatal cavity caused by transpiration.
[24] The unit of electrical power is –
A.
Bolt
B.
Watt
C.
Kilowatt hour
D.
Ampere
Ans:
Watt
Explanation :
Electric power is the rate at which electric energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Watt is named after the Scottish engineer James Watt who invented the Newcomen Steam Engine.
[25] The scientist who first sent electromagnetic waves to distant places is –
A.
James Clerk Maxwell
B.
Heinrich Hertz
C.
Thomas Alva Edison
D.
John Logie Baird
Ans:
Thomas Alva Edison
Explanation :
Radio is the transmission of single through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 30 kHz to 300 GHz. Those waves are called radio waves.
Explanation :
Most of the ultraviolet radiation in sunlight is absorbed by oxygen in Earth's atmosphere, which forms the ozone layer of the lower stratosphere. UV light is found in sunlight (where it constitutes about 10% of the energy in vacuum) and is emitted by electric arcs and specialized lights such as black lights. It can cause chemical reactions, and causes many substances to glow or fluoresce. Most ultraviolet is classified as non-ionizing radiation.
[14] Which of the following metals is used for the manufacture of heating elements provided in electric iron?
A.
Nickel
B.
Chromium
C.
Nichrome
D.
Tungsten
Ans:
Nichrome
Explanation :
Nichrome is the most common domestic heating element and is found in many household products. Commonly, items such as toasters, hair dryers and heaters use nichrome coils to pass electricity and give off heat. Nichrome is made of 80 percent nickel and 20 percent chromium, and its high melting point of 1,400 degrees Celsius.
[15] When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is clue to the phenomenon of –
A.
evaporation
B.
vaporisation
C.
diffusion
D.
sublimation
Ans:
diffusion
Explanation :
Diffusion is one of several transport phenomena that occur in nature. A distinguishing feature of diffusion is that it results in mixing or mass transport without requiring bulk motion. Thus, diffusion should not be confused with convection or advection, which are other transport mechanisms that use bulk motion to move particles from One place to another.
[16] Clear nights are colder than cloudy nights because of –
A.
conduction
B.
condensation
C.
radiation
D.
insolation
Ans:
radiation
Explanation :
Cloudless nights are colder because the nights that have clouds provide a blanket for the earth and trap some of the hot day air where as the cloudless nights have no protection so all the hot air rises up into the sky. radiation is a process in which energetic particles or energetic waves travel through vacuum, or through matter-containing media that are not required for their propagation. Waves of a massive medium itself, such as water waves or sound waves, are usually not considered to be forms of “radiation” in this sense. By contrast, gravitational waves, which are waves of space-time itself, qualify as a type of radiation.
[17] In AC circuits, AC meters measure –
A.
mean values
B.
rms values
C.
peak values
D.
mean square values
Ans:
rms values
Explanation :
Voltages and currents for AC circuits are generally expressed as rms (root mean square) values. For a sine wave, the relationship between the peak and the rms average is: rms value = 0.707 peak value.
[18] When a light wave is reflected from a mirror, there is a change in its –
A.
frequency
B.
amplitude
C.
wavelength
D.
velocity
Ans:
amplitude
Explanation :
When a light wave is reflected from an object, it changes not only its amplitude but also its phase according to the properties of the object at a particular point. The velocity and momentum are just reversed in another direction.
[19] A body absorbs heat most if it is –
A.
black and rough
B.
black and smooth
C.
white and rough
D.
white and smooth
Ans:
black and rough
Explanation :
A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. Another property is roughness. Sand is rough and black and so it is a good absorber.
[20] Which of the following is not a vector quantity?
A.
Acceleration
B.
Electric current
C.
Force
D.
Velocity
Ans:
Electric current
Explanation :
For a physical quantity to be termed a vector quantity, having magnitude and direction is not enough.
[21] Which one of the following is used for determining the structure of crystal -
A.
Gamma rays
B.
X-rays
C.
UV rays
D.
visible light
Ans:
X-rays
Explanation :
Crystallography is the science that examines crystals which can be found everywhere in nature, from salt to snowflakes to gemstones.
[22] How many terminals do an electric cell has?
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
The metal disc is the negative terminal. All electric cells have two terminals; a positive terminal and a negative terminal.
[23] Water from soil enters into the root hairs owing to :
A.
Atmospheric pressure
B.
Capillary pressure
C.
Root pressure
D.
Osmotic pressure
Ans:
Capillary pressure
Explanation :
In plants, the transpiration stream is the uninterrupted stream of water, and other, which is taken up by the roots and, via the xylem vessels, transported to the leaves where it will eventually evaporate into the airiapoplast-interface of the substomatal cavity. It is driven in by capillary action and in some plants root pressure. The main driving factor is the difference in water potential between the soil and the substomatal cavity caused by transpiration.
[24] The unit of electrical power is –
A.
Bolt
B.
Watt
C.
Kilowatt hour
D.
Ampere
Ans:
Watt
Explanation :
Electric power is the rate at which electric energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Watt is named after the Scottish engineer James Watt who invented the Newcomen Steam Engine.
[25] The scientist who first sent electromagnetic waves to distant places is –
A.
James Clerk Maxwell
B.
Heinrich Hertz
C.
Thomas Alva Edison
D.
John Logie Baird
Ans:
Thomas Alva Edison
Explanation :
Radio is the transmission of single through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 30 kHz to 300 GHz. Those waves are called radio waves.
Explanation :
Diffusion is one of several transport phenomena that occur in nature. A distinguishing feature of diffusion is that it results in mixing or mass transport without requiring bulk motion. Thus, diffusion should not be confused with convection or advection, which are other transport mechanisms that use bulk motion to move particles from One place to another.
[16] Clear nights are colder than cloudy nights because of –
A.
conduction
B.
condensation
C.
radiation
D.
insolation
Ans:
radiation
Explanation :
Cloudless nights are colder because the nights that have clouds provide a blanket for the earth and trap some of the hot day air where as the cloudless nights have no protection so all the hot air rises up into the sky. radiation is a process in which energetic particles or energetic waves travel through vacuum, or through matter-containing media that are not required for their propagation. Waves of a massive medium itself, such as water waves or sound waves, are usually not considered to be forms of “radiation” in this sense. By contrast, gravitational waves, which are waves of space-time itself, qualify as a type of radiation.
[17] In AC circuits, AC meters measure –
A.
mean values
B.
rms values
C.
peak values
D.
mean square values
Ans:
rms values
Explanation :
Voltages and currents for AC circuits are generally expressed as rms (root mean square) values. For a sine wave, the relationship between the peak and the rms average is: rms value = 0.707 peak value.
[18] When a light wave is reflected from a mirror, there is a change in its –
A.
frequency
B.
amplitude
C.
wavelength
D.
velocity
Ans:
amplitude
Explanation :
When a light wave is reflected from an object, it changes not only its amplitude but also its phase according to the properties of the object at a particular point. The velocity and momentum are just reversed in another direction.
[19] A body absorbs heat most if it is –
A.
black and rough
B.
black and smooth
C.
white and rough
D.
white and smooth
Ans:
black and rough
Explanation :
A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. Another property is roughness. Sand is rough and black and so it is a good absorber.
[20] Which of the following is not a vector quantity?
A.
Acceleration
B.
Electric current
C.
Force
D.
Velocity
Ans:
Electric current
Explanation :
For a physical quantity to be termed a vector quantity, having magnitude and direction is not enough.
[21] Which one of the following is used for determining the structure of crystal -
A.
Gamma rays
B.
X-rays
C.
UV rays
D.
visible light
Ans:
X-rays
Explanation :
Crystallography is the science that examines crystals which can be found everywhere in nature, from salt to snowflakes to gemstones.
[22] How many terminals do an electric cell has?
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
The metal disc is the negative terminal. All electric cells have two terminals; a positive terminal and a negative terminal.
[23] Water from soil enters into the root hairs owing to :
A.
Atmospheric pressure
B.
Capillary pressure
C.
Root pressure
D.
Osmotic pressure
Ans:
Capillary pressure
Explanation :
In plants, the transpiration stream is the uninterrupted stream of water, and other, which is taken up by the roots and, via the xylem vessels, transported to the leaves where it will eventually evaporate into the airiapoplast-interface of the substomatal cavity. It is driven in by capillary action and in some plants root pressure. The main driving factor is the difference in water potential between the soil and the substomatal cavity caused by transpiration.
[24] The unit of electrical power is –
A.
Bolt
B.
Watt
C.
Kilowatt hour
D.
Ampere
Ans:
Watt
Explanation :
Electric power is the rate at which electric energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Watt is named after the Scottish engineer James Watt who invented the Newcomen Steam Engine.
[25] The scientist who first sent electromagnetic waves to distant places is –
A.
James Clerk Maxwell
B.
Heinrich Hertz
C.
Thomas Alva Edison
D.
John Logie Baird
Ans:
Thomas Alva Edison
Explanation :
Radio is the transmission of single through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 30 kHz to 300 GHz. Those waves are called radio waves.
Explanation :
Voltages and currents for AC circuits are generally expressed as rms (root mean square) values. For a sine wave, the relationship between the peak and the rms average is: rms value = 0.707 peak value.
[18] When a light wave is reflected from a mirror, there is a change in its –
A.
frequency
B.
amplitude
C.
wavelength
D.
velocity
Ans:
amplitude
Explanation :
When a light wave is reflected from an object, it changes not only its amplitude but also its phase according to the properties of the object at a particular point. The velocity and momentum are just reversed in another direction.
[19] A body absorbs heat most if it is –
A.
black and rough
B.
black and smooth
C.
white and rough
D.
white and smooth
Ans:
black and rough
Explanation :
A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. Another property is roughness. Sand is rough and black and so it is a good absorber.
[20] Which of the following is not a vector quantity?
A.
Acceleration
B.
Electric current
C.
Force
D.
Velocity
Ans:
Electric current
Explanation :
For a physical quantity to be termed a vector quantity, having magnitude and direction is not enough.
[21] Which one of the following is used for determining the structure of crystal -
A.
Gamma rays
B.
X-rays
C.
UV rays
D.
visible light
Ans:
X-rays
Explanation :
Crystallography is the science that examines crystals which can be found everywhere in nature, from salt to snowflakes to gemstones.
[22] How many terminals do an electric cell has?
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
The metal disc is the negative terminal. All electric cells have two terminals; a positive terminal and a negative terminal.
[23] Water from soil enters into the root hairs owing to :
A.
Atmospheric pressure
B.
Capillary pressure
C.
Root pressure
D.
Osmotic pressure
Ans:
Capillary pressure
Explanation :
In plants, the transpiration stream is the uninterrupted stream of water, and other, which is taken up by the roots and, via the xylem vessels, transported to the leaves where it will eventually evaporate into the airiapoplast-interface of the substomatal cavity. It is driven in by capillary action and in some plants root pressure. The main driving factor is the difference in water potential between the soil and the substomatal cavity caused by transpiration.
[24] The unit of electrical power is –
A.
Bolt
B.
Watt
C.
Kilowatt hour
D.
Ampere
Ans:
Watt
Explanation :
Electric power is the rate at which electric energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Watt is named after the Scottish engineer James Watt who invented the Newcomen Steam Engine.
[25] The scientist who first sent electromagnetic waves to distant places is –
A.
James Clerk Maxwell
B.
Heinrich Hertz
C.
Thomas Alva Edison
D.
John Logie Baird
Ans:
Thomas Alva Edison
Explanation :
Radio is the transmission of single through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 30 kHz to 300 GHz. Those waves are called radio waves.
Explanation :
A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. Another property is roughness. Sand is rough and black and so it is a good absorber.
[20] Which of the following is not a vector quantity?
A.
Acceleration
B.
Electric current
C.
Force
D.
Velocity
Ans:
Electric current
Explanation :
For a physical quantity to be termed a vector quantity, having magnitude and direction is not enough.
[21] Which one of the following is used for determining the structure of crystal -
A.
Gamma rays
B.
X-rays
C.
UV rays
D.
visible light
Ans:
X-rays
Explanation :
Crystallography is the science that examines crystals which can be found everywhere in nature, from salt to snowflakes to gemstones.
[22] How many terminals do an electric cell has?
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
The metal disc is the negative terminal. All electric cells have two terminals; a positive terminal and a negative terminal.
[23] Water from soil enters into the root hairs owing to :
A.
Atmospheric pressure
B.
Capillary pressure
C.
Root pressure
D.
Osmotic pressure
Ans:
Capillary pressure
Explanation :
In plants, the transpiration stream is the uninterrupted stream of water, and other, which is taken up by the roots and, via the xylem vessels, transported to the leaves where it will eventually evaporate into the airiapoplast-interface of the substomatal cavity. It is driven in by capillary action and in some plants root pressure. The main driving factor is the difference in water potential between the soil and the substomatal cavity caused by transpiration.
[24] The unit of electrical power is –
A.
Bolt
B.
Watt
C.
Kilowatt hour
D.
Ampere
Ans:
Watt
Explanation :
Electric power is the rate at which electric energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Watt is named after the Scottish engineer James Watt who invented the Newcomen Steam Engine.
[25] The scientist who first sent electromagnetic waves to distant places is –
A.
James Clerk Maxwell
B.
Heinrich Hertz
C.
Thomas Alva Edison
D.
John Logie Baird
Ans:
Thomas Alva Edison
Explanation :
Radio is the transmission of single through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 30 kHz to 300 GHz. Those waves are called radio waves.
Explanation :
Crystallography is the science that examines crystals which can be found everywhere in nature, from salt to snowflakes to gemstones.
[22] How many terminals do an electric cell has?
A.
1
B.
2
C.
3
D.
4
Ans:
2
Explanation :
The metal disc is the negative terminal. All electric cells have two terminals; a positive terminal and a negative terminal.
[23] Water from soil enters into the root hairs owing to :
A.
Atmospheric pressure
B.
Capillary pressure
C.
Root pressure
D.
Osmotic pressure
Ans:
Capillary pressure
Explanation :
In plants, the transpiration stream is the uninterrupted stream of water, and other, which is taken up by the roots and, via the xylem vessels, transported to the leaves where it will eventually evaporate into the airiapoplast-interface of the substomatal cavity. It is driven in by capillary action and in some plants root pressure. The main driving factor is the difference in water potential between the soil and the substomatal cavity caused by transpiration.
[24] The unit of electrical power is –
A.
Bolt
B.
Watt
C.
Kilowatt hour
D.
Ampere
Ans:
Watt
Explanation :
Electric power is the rate at which electric energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Watt is named after the Scottish engineer James Watt who invented the Newcomen Steam Engine.
[25] The scientist who first sent electromagnetic waves to distant places is –
A.
James Clerk Maxwell
B.
Heinrich Hertz
C.
Thomas Alva Edison
D.
John Logie Baird
Ans:
Thomas Alva Edison
Explanation :
Radio is the transmission of single through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 30 kHz to 300 GHz. Those waves are called radio waves.
Explanation :
In plants, the transpiration stream is the uninterrupted stream of water, and other, which is taken up by the roots and, via the xylem vessels, transported to the leaves where it will eventually evaporate into the airiapoplast-interface of the substomatal cavity. It is driven in by capillary action and in some plants root pressure. The main driving factor is the difference in water potential between the soil and the substomatal cavity caused by transpiration.
[24] The unit of electrical power is –
A.
Bolt
B.
Watt
C.
Kilowatt hour
D.
Ampere
Ans:
Watt
Explanation :
Electric power is the rate at which electric energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Watt is named after the Scottish engineer James Watt who invented the Newcomen Steam Engine.
[25] The scientist who first sent electromagnetic waves to distant places is –
A.
James Clerk Maxwell
B.
Heinrich Hertz
C.
Thomas Alva Edison
D.
John Logie Baird
Ans:
Thomas Alva Edison
Explanation :
Radio is the transmission of single through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 30 kHz to 300 GHz. Those waves are called radio waves.
Explanation :
Radio is the transmission of single through free space by electromagnetic radiation of a frequency significantly below that of visible light, in the radio frequency range, from about 30 kHz to 300 GHz. Those waves are called radio waves.