[1] Lognitudinal waves and Transverse waves are types of -
A.
Mechanical waves
B.
Non-Mechanical waves
C.
Both of above
D.
None of Above
Ans:
Mechanical waves
Explanation :
Mechanical Waves are waves which propagate through a material medium (solid, liquid, or gas) at a wave speed which depends on the elastic and inertial properties of that medium. There are two basic types of wave motion for mechanical waves: longitudinal waves and transverse waves.
[2] The brightest planet is .
A.
Jupiter
B.
Mars
C.
Venus
D.
Mercury
Ans:
Venus
Explanation :
Venus is one of the brightest objects in the night sky Venus is so bright because its thick clouds reflect most of the sunlight that reaches it (about 70%) back into space, and because it is the closest planet to Earth.
[3] Sound in TV is modulating -
A.
AM
B.
FM
C.
PCM
D.
PM
Ans:
AM
Explanation :
0
[4] Density of water is maximum at .
A.
12 degree Celsius
B.
8 degree Celsius
C.
4 degree Celsius
D.
0 degree Celsius
Ans:
4 degree Celsius
Explanation :
Water never has an absolute density because its density varies with temperature. Water has a maximum density at 3.98 degrees Celsius.
[5] Formation of shadows can be explained by -
A.
rectilinear propagation of light
B.
reflection
C.
refraction
D.
total internal reflection
Ans:
rectilinear propagation of light
Explanation :
In this position, the head light will be at the principal focus so that the rays of light falling on the concave mirror will be rendered parallel
[6] A liquid disturbed by stirring comes to rest due to –
A.
density
B.
surface tension
C.
viscosity
D.
centripetal force
Ans:
viscosity
Explanation :
It happens because of viscosity. The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress. It is due to friction between neighboring parcels of the fluid that are moving at different velocities.
[7] In Astrophysics, what name is given to a hypothetical hole in outer space from which stars and energy emerge?
A.
Black hole
B.
Ozone hole
C.
Asteroid belt
D.
White hole
Ans:
White hole
Explanation :
A White Hole is a hypothetical hole in outer space from which energy, stars, and other celestial matter emerge or explode. It is a theoretical celestial object into which matter is funneled from a black hole.
[8] The Laser is a beam of radiations which are –
A.
Non-coherent and monochromatic
B.
Coherent and monochromatic
C.
Non-coherent and non-monochromatic
D.
Coherent and non-monochromatic
Ans:
Coherent and monochromatic
Explanation :
Laser, an acronym for Light Amplification by Stimulated Emission of Radiation, creates a radiation beam that is coherent (in-phase). In a coherent light source, the amplitude of the radiated waves is added and results in a radiation beam of great intensity. It normally produces only one or two wavelengths.
[9] Ice float on water because its density is -
A.
more than water
B.
less than water
C.
zero
D.
same as water
Ans:
less than water
Explanation :
Archimedes' Principle states that for an object to floaton water, it must displace an equal amount of water. Ice floats because it is about 9% less dense than liquid water.
[10] Distances of stars are measured in –
A.
Galactic unit
B.
Stellar mile
C.
Cosmic kilometre
D.
Light year
Ans:
Light year
Explanation :
Light year is a unit of length used informally to express astronomical distances. It is most often used when expressing distances to stars and other distances on a galactic scale. It is equal to just under 10 trillion kilometres.
[11] Loudness of sound depends on –
A.
Frequency
B.
Wavelength
C.
Amplitude
D.
Pitch
Ans:
Amplitude
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[12] A man jumping out of a moving train is thrown -
A.
forward
B.
backward
C.
sideways
D.
None of these
Ans:
forward
Explanation :
At the time of jumping out he has the same velocity as the moving train.
[13] Blowing Air with open pipe is an example of –
A.
isothermal process
B.
isochroric process
C.
Isobaric process
D.
Adiabatic process
Ans:
Isobaric process
Explanation :
When air is suddenly exhaled out into a larger volume through the narrow opening, air undergo adiabatic expansion. So blowing air is an adiabatic process. But since it is open pipe, the pressure inside and pressure outside remains same.
[14] The amount of matter in a ball of steel is its –
A.
Weight
B.
Mass
C.
Density
D.
Volume
Ans:
Mass
Explanation :
In simple terms, mass is the amount of matter in an object, and is measured in grams. Under normal circumstances, and as long as it remains intact, an object will always have the same mass, i.e. there will always be the same amount of matter in it.
[15] When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will:
A.
remain same
B.
double
C.
three times
D.
four times
Ans:
double
Explanation :
According to Newton's law of cooling, the rate of loss of heat of a body is directly proportional to the difference between the temperature of hot body and temperature of the surroundings, provided that the difference in temperature is small enough.
[16] The weight of a body at the centre of earth is:
A.
half the weight at the surface
B.
zero
C.
twice the weight at the surface
D.
infinite
Ans:
zero
Explanation :
Weight of a body is the force with which it is attracted towards the centre of earth. The weight of a body, 'w' of mass `m' is given by: W = mg, where `g is the acceleration due to gravity At the centre of earth, value of 'g' is zero. Therefore, weight of a body is zero at the centre of the earth.
[17] The component used for tuning a radio is basically a variable –
A.
Resistor
B.
Condenser
C.
Inductor
D.
Transformer
Ans:
Condenser
Explanation :
A tuning capacitor or tuning condenser is a variable capacitor used in an electronic circuit of a radio. It usually connects in parallel to a loop antenna and its capacitance may be intentionally and repeatedly changed mechanically or electronically.
[18] 0°K, is equivalent to –
A.
273°C
B.
-273°C
C.
0°C
D.
100°C
Ans:
-273°C
Explanation :
0 degrees Kelvin is equal to -273.15 degrees Celsius. It is the lowest possible temperature, at which all molecules are have the least possible amount of kinetic energy.
[19] What type of force acts on a car moving around a curve?
A.
Centrifugal force
B.
Cohesive force
C.
Centripetal force
D.
Gravitational force
Ans:
Centripetal force
Explanation :
Any object moving in a circle (or along a circular path) experiences a centripetal force. It is this physical force that pushes or pulls the object towards the center of the circle. In the case of a car moving along a curve, as it makes a turn, the force of friction acting upon the turned wheels of the car provides centripetal force required for circular motion.
[20] Which one among the following is not an electromagnetic wave?
A.
X-Ray
B.
R-Ray
C.
Cathode Ray
D.
Infrared Ray
Ans:
Cathode Ray
Explanation :
In physics, electromagnetic radiation (EMR) refers to the waves (or their quanta, photons) of the electro-magnetic field, propagating (radiating) through space carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-, and gamma radiation.
[21] Which one of the following is a good electrical conductor?
A.
Graphite
B.
Diamond
C.
Peat
D.
Charcoal
Ans:
Graphite
Explanation :
Graphite is a good conductor of electricity because its electrons are delocalized or free to move around. Each carbon atom in graphite is directly linked to only three carbon atoms through covalent bonds. Therefore, out of the four valence electrons in a car-bon atom, only three are used for bonding and the fourth is relatively free and can move from one car-bon atom to the other.
[22] Which °fine metals has the maximum thermal conductivity?
A.
Iron
B.
Aluminium
C.
Silver
D.
Copper
Ans:
Silver
Explanation :
Silver has the best thermal conductivity of 429 W/mK at RT (295K). It is followed by copper, gold and aluminum. Metals generally have very good electrical conductivity, that leads to high thermal conductivity.
[23] What do radioactive substances emit?
A.
Radio waves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ rays
Ans:
α, β and γ rays
Explanation :
Of the three main types of radiation given off during radioactive decay, two are particles and one is energy; scientists call them alpha, beta and gamma after the first three letters of the Greek alphabet.
[24] The term ‘Higgs Boson' is associated with –
A.
Nano Technology
B.
Oncology
C.
God Particle
D.
Stem Cell Research
Ans:
God Particle
Explanation :
The Higgs boson is an elementary particle in the Standard Model of particle physics. That is often referred to as the "God particle" in popular media out-side the scientific community.
[25] Addition of suitable impurities into semiconductor, is called –
A.
Doping
B.
Mixing
C.
Forming
D.
Diluting
Ans:
Doping
Explanation :
In semiconductor production, doping refers to the introduction of impurities into an extremely pure intrinsic semiconductor for the purpose of modulating its electrical properties. The impurities are dependent upon the type of semiconductor and the properties that it needs to have for its intended purpose.
Explanation :
Mechanical Waves are waves which propagate through a material medium (solid, liquid, or gas) at a wave speed which depends on the elastic and inertial properties of that medium. There are two basic types of wave motion for mechanical waves: longitudinal waves and transverse waves.
[2] The brightest planet is .
A.
Jupiter
B.
Mars
C.
Venus
D.
Mercury
Ans:
Venus
Explanation :
Venus is one of the brightest objects in the night sky Venus is so bright because its thick clouds reflect most of the sunlight that reaches it (about 70%) back into space, and because it is the closest planet to Earth.
[3] Sound in TV is modulating -
A.
AM
B.
FM
C.
PCM
D.
PM
Ans:
AM
Explanation :
0
[4] Density of water is maximum at .
A.
12 degree Celsius
B.
8 degree Celsius
C.
4 degree Celsius
D.
0 degree Celsius
Ans:
4 degree Celsius
Explanation :
Water never has an absolute density because its density varies with temperature. Water has a maximum density at 3.98 degrees Celsius.
[5] Formation of shadows can be explained by -
A.
rectilinear propagation of light
B.
reflection
C.
refraction
D.
total internal reflection
Ans:
rectilinear propagation of light
Explanation :
In this position, the head light will be at the principal focus so that the rays of light falling on the concave mirror will be rendered parallel
[6] A liquid disturbed by stirring comes to rest due to –
A.
density
B.
surface tension
C.
viscosity
D.
centripetal force
Ans:
viscosity
Explanation :
It happens because of viscosity. The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress. It is due to friction between neighboring parcels of the fluid that are moving at different velocities.
[7] In Astrophysics, what name is given to a hypothetical hole in outer space from which stars and energy emerge?
A.
Black hole
B.
Ozone hole
C.
Asteroid belt
D.
White hole
Ans:
White hole
Explanation :
A White Hole is a hypothetical hole in outer space from which energy, stars, and other celestial matter emerge or explode. It is a theoretical celestial object into which matter is funneled from a black hole.
[8] The Laser is a beam of radiations which are –
A.
Non-coherent and monochromatic
B.
Coherent and monochromatic
C.
Non-coherent and non-monochromatic
D.
Coherent and non-monochromatic
Ans:
Coherent and monochromatic
Explanation :
Laser, an acronym for Light Amplification by Stimulated Emission of Radiation, creates a radiation beam that is coherent (in-phase). In a coherent light source, the amplitude of the radiated waves is added and results in a radiation beam of great intensity. It normally produces only one or two wavelengths.
[9] Ice float on water because its density is -
A.
more than water
B.
less than water
C.
zero
D.
same as water
Ans:
less than water
Explanation :
Archimedes' Principle states that for an object to floaton water, it must displace an equal amount of water. Ice floats because it is about 9% less dense than liquid water.
[10] Distances of stars are measured in –
A.
Galactic unit
B.
Stellar mile
C.
Cosmic kilometre
D.
Light year
Ans:
Light year
Explanation :
Light year is a unit of length used informally to express astronomical distances. It is most often used when expressing distances to stars and other distances on a galactic scale. It is equal to just under 10 trillion kilometres.
[11] Loudness of sound depends on –
A.
Frequency
B.
Wavelength
C.
Amplitude
D.
Pitch
Ans:
Amplitude
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[12] A man jumping out of a moving train is thrown -
A.
forward
B.
backward
C.
sideways
D.
None of these
Ans:
forward
Explanation :
At the time of jumping out he has the same velocity as the moving train.
[13] Blowing Air with open pipe is an example of –
A.
isothermal process
B.
isochroric process
C.
Isobaric process
D.
Adiabatic process
Ans:
Isobaric process
Explanation :
When air is suddenly exhaled out into a larger volume through the narrow opening, air undergo adiabatic expansion. So blowing air is an adiabatic process. But since it is open pipe, the pressure inside and pressure outside remains same.
[14] The amount of matter in a ball of steel is its –
A.
Weight
B.
Mass
C.
Density
D.
Volume
Ans:
Mass
Explanation :
In simple terms, mass is the amount of matter in an object, and is measured in grams. Under normal circumstances, and as long as it remains intact, an object will always have the same mass, i.e. there will always be the same amount of matter in it.
[15] When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will:
A.
remain same
B.
double
C.
three times
D.
four times
Ans:
double
Explanation :
According to Newton's law of cooling, the rate of loss of heat of a body is directly proportional to the difference between the temperature of hot body and temperature of the surroundings, provided that the difference in temperature is small enough.
[16] The weight of a body at the centre of earth is:
A.
half the weight at the surface
B.
zero
C.
twice the weight at the surface
D.
infinite
Ans:
zero
Explanation :
Weight of a body is the force with which it is attracted towards the centre of earth. The weight of a body, 'w' of mass `m' is given by: W = mg, where `g is the acceleration due to gravity At the centre of earth, value of 'g' is zero. Therefore, weight of a body is zero at the centre of the earth.
[17] The component used for tuning a radio is basically a variable –
A.
Resistor
B.
Condenser
C.
Inductor
D.
Transformer
Ans:
Condenser
Explanation :
A tuning capacitor or tuning condenser is a variable capacitor used in an electronic circuit of a radio. It usually connects in parallel to a loop antenna and its capacitance may be intentionally and repeatedly changed mechanically or electronically.
[18] 0°K, is equivalent to –
A.
273°C
B.
-273°C
C.
0°C
D.
100°C
Ans:
-273°C
Explanation :
0 degrees Kelvin is equal to -273.15 degrees Celsius. It is the lowest possible temperature, at which all molecules are have the least possible amount of kinetic energy.
[19] What type of force acts on a car moving around a curve?
A.
Centrifugal force
B.
Cohesive force
C.
Centripetal force
D.
Gravitational force
Ans:
Centripetal force
Explanation :
Any object moving in a circle (or along a circular path) experiences a centripetal force. It is this physical force that pushes or pulls the object towards the center of the circle. In the case of a car moving along a curve, as it makes a turn, the force of friction acting upon the turned wheels of the car provides centripetal force required for circular motion.
[20] Which one among the following is not an electromagnetic wave?
A.
X-Ray
B.
R-Ray
C.
Cathode Ray
D.
Infrared Ray
Ans:
Cathode Ray
Explanation :
In physics, electromagnetic radiation (EMR) refers to the waves (or their quanta, photons) of the electro-magnetic field, propagating (radiating) through space carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-, and gamma radiation.
[21] Which one of the following is a good electrical conductor?
A.
Graphite
B.
Diamond
C.
Peat
D.
Charcoal
Ans:
Graphite
Explanation :
Graphite is a good conductor of electricity because its electrons are delocalized or free to move around. Each carbon atom in graphite is directly linked to only three carbon atoms through covalent bonds. Therefore, out of the four valence electrons in a car-bon atom, only three are used for bonding and the fourth is relatively free and can move from one car-bon atom to the other.
[22] Which °fine metals has the maximum thermal conductivity?
A.
Iron
B.
Aluminium
C.
Silver
D.
Copper
Ans:
Silver
Explanation :
Silver has the best thermal conductivity of 429 W/mK at RT (295K). It is followed by copper, gold and aluminum. Metals generally have very good electrical conductivity, that leads to high thermal conductivity.
[23] What do radioactive substances emit?
A.
Radio waves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ rays
Ans:
α, β and γ rays
Explanation :
Of the three main types of radiation given off during radioactive decay, two are particles and one is energy; scientists call them alpha, beta and gamma after the first three letters of the Greek alphabet.
[24] The term ‘Higgs Boson' is associated with –
A.
Nano Technology
B.
Oncology
C.
God Particle
D.
Stem Cell Research
Ans:
God Particle
Explanation :
The Higgs boson is an elementary particle in the Standard Model of particle physics. That is often referred to as the "God particle" in popular media out-side the scientific community.
[25] Addition of suitable impurities into semiconductor, is called –
A.
Doping
B.
Mixing
C.
Forming
D.
Diluting
Ans:
Doping
Explanation :
In semiconductor production, doping refers to the introduction of impurities into an extremely pure intrinsic semiconductor for the purpose of modulating its electrical properties. The impurities are dependent upon the type of semiconductor and the properties that it needs to have for its intended purpose.
Explanation :
0
[4] Density of water is maximum at .
A.
12 degree Celsius
B.
8 degree Celsius
C.
4 degree Celsius
D.
0 degree Celsius
Ans:
4 degree Celsius
Explanation :
Water never has an absolute density because its density varies with temperature. Water has a maximum density at 3.98 degrees Celsius.
[5] Formation of shadows can be explained by -
A.
rectilinear propagation of light
B.
reflection
C.
refraction
D.
total internal reflection
Ans:
rectilinear propagation of light
Explanation :
In this position, the head light will be at the principal focus so that the rays of light falling on the concave mirror will be rendered parallel
[6] A liquid disturbed by stirring comes to rest due to –
A.
density
B.
surface tension
C.
viscosity
D.
centripetal force
Ans:
viscosity
Explanation :
It happens because of viscosity. The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress. It is due to friction between neighboring parcels of the fluid that are moving at different velocities.
[7] In Astrophysics, what name is given to a hypothetical hole in outer space from which stars and energy emerge?
A.
Black hole
B.
Ozone hole
C.
Asteroid belt
D.
White hole
Ans:
White hole
Explanation :
A White Hole is a hypothetical hole in outer space from which energy, stars, and other celestial matter emerge or explode. It is a theoretical celestial object into which matter is funneled from a black hole.
[8] The Laser is a beam of radiations which are –
A.
Non-coherent and monochromatic
B.
Coherent and monochromatic
C.
Non-coherent and non-monochromatic
D.
Coherent and non-monochromatic
Ans:
Coherent and monochromatic
Explanation :
Laser, an acronym for Light Amplification by Stimulated Emission of Radiation, creates a radiation beam that is coherent (in-phase). In a coherent light source, the amplitude of the radiated waves is added and results in a radiation beam of great intensity. It normally produces only one or two wavelengths.
[9] Ice float on water because its density is -
A.
more than water
B.
less than water
C.
zero
D.
same as water
Ans:
less than water
Explanation :
Archimedes' Principle states that for an object to floaton water, it must displace an equal amount of water. Ice floats because it is about 9% less dense than liquid water.
[10] Distances of stars are measured in –
A.
Galactic unit
B.
Stellar mile
C.
Cosmic kilometre
D.
Light year
Ans:
Light year
Explanation :
Light year is a unit of length used informally to express astronomical distances. It is most often used when expressing distances to stars and other distances on a galactic scale. It is equal to just under 10 trillion kilometres.
[11] Loudness of sound depends on –
A.
Frequency
B.
Wavelength
C.
Amplitude
D.
Pitch
Ans:
Amplitude
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[12] A man jumping out of a moving train is thrown -
A.
forward
B.
backward
C.
sideways
D.
None of these
Ans:
forward
Explanation :
At the time of jumping out he has the same velocity as the moving train.
[13] Blowing Air with open pipe is an example of –
A.
isothermal process
B.
isochroric process
C.
Isobaric process
D.
Adiabatic process
Ans:
Isobaric process
Explanation :
When air is suddenly exhaled out into a larger volume through the narrow opening, air undergo adiabatic expansion. So blowing air is an adiabatic process. But since it is open pipe, the pressure inside and pressure outside remains same.
[14] The amount of matter in a ball of steel is its –
A.
Weight
B.
Mass
C.
Density
D.
Volume
Ans:
Mass
Explanation :
In simple terms, mass is the amount of matter in an object, and is measured in grams. Under normal circumstances, and as long as it remains intact, an object will always have the same mass, i.e. there will always be the same amount of matter in it.
[15] When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will:
A.
remain same
B.
double
C.
three times
D.
four times
Ans:
double
Explanation :
According to Newton's law of cooling, the rate of loss of heat of a body is directly proportional to the difference between the temperature of hot body and temperature of the surroundings, provided that the difference in temperature is small enough.
[16] The weight of a body at the centre of earth is:
A.
half the weight at the surface
B.
zero
C.
twice the weight at the surface
D.
infinite
Ans:
zero
Explanation :
Weight of a body is the force with which it is attracted towards the centre of earth. The weight of a body, 'w' of mass `m' is given by: W = mg, where `g is the acceleration due to gravity At the centre of earth, value of 'g' is zero. Therefore, weight of a body is zero at the centre of the earth.
[17] The component used for tuning a radio is basically a variable –
A.
Resistor
B.
Condenser
C.
Inductor
D.
Transformer
Ans:
Condenser
Explanation :
A tuning capacitor or tuning condenser is a variable capacitor used in an electronic circuit of a radio. It usually connects in parallel to a loop antenna and its capacitance may be intentionally and repeatedly changed mechanically or electronically.
[18] 0°K, is equivalent to –
A.
273°C
B.
-273°C
C.
0°C
D.
100°C
Ans:
-273°C
Explanation :
0 degrees Kelvin is equal to -273.15 degrees Celsius. It is the lowest possible temperature, at which all molecules are have the least possible amount of kinetic energy.
[19] What type of force acts on a car moving around a curve?
A.
Centrifugal force
B.
Cohesive force
C.
Centripetal force
D.
Gravitational force
Ans:
Centripetal force
Explanation :
Any object moving in a circle (or along a circular path) experiences a centripetal force. It is this physical force that pushes or pulls the object towards the center of the circle. In the case of a car moving along a curve, as it makes a turn, the force of friction acting upon the turned wheels of the car provides centripetal force required for circular motion.
[20] Which one among the following is not an electromagnetic wave?
A.
X-Ray
B.
R-Ray
C.
Cathode Ray
D.
Infrared Ray
Ans:
Cathode Ray
Explanation :
In physics, electromagnetic radiation (EMR) refers to the waves (or their quanta, photons) of the electro-magnetic field, propagating (radiating) through space carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-, and gamma radiation.
[21] Which one of the following is a good electrical conductor?
A.
Graphite
B.
Diamond
C.
Peat
D.
Charcoal
Ans:
Graphite
Explanation :
Graphite is a good conductor of electricity because its electrons are delocalized or free to move around. Each carbon atom in graphite is directly linked to only three carbon atoms through covalent bonds. Therefore, out of the four valence electrons in a car-bon atom, only three are used for bonding and the fourth is relatively free and can move from one car-bon atom to the other.
[22] Which °fine metals has the maximum thermal conductivity?
A.
Iron
B.
Aluminium
C.
Silver
D.
Copper
Ans:
Silver
Explanation :
Silver has the best thermal conductivity of 429 W/mK at RT (295K). It is followed by copper, gold and aluminum. Metals generally have very good electrical conductivity, that leads to high thermal conductivity.
[23] What do radioactive substances emit?
A.
Radio waves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ rays
Ans:
α, β and γ rays
Explanation :
Of the three main types of radiation given off during radioactive decay, two are particles and one is energy; scientists call them alpha, beta and gamma after the first three letters of the Greek alphabet.
[24] The term ‘Higgs Boson' is associated with –
A.
Nano Technology
B.
Oncology
C.
God Particle
D.
Stem Cell Research
Ans:
God Particle
Explanation :
The Higgs boson is an elementary particle in the Standard Model of particle physics. That is often referred to as the "God particle" in popular media out-side the scientific community.
[25] Addition of suitable impurities into semiconductor, is called –
A.
Doping
B.
Mixing
C.
Forming
D.
Diluting
Ans:
Doping
Explanation :
In semiconductor production, doping refers to the introduction of impurities into an extremely pure intrinsic semiconductor for the purpose of modulating its electrical properties. The impurities are dependent upon the type of semiconductor and the properties that it needs to have for its intended purpose.
Explanation :
In this position, the head light will be at the principal focus so that the rays of light falling on the concave mirror will be rendered parallel
[6] A liquid disturbed by stirring comes to rest due to –
A.
density
B.
surface tension
C.
viscosity
D.
centripetal force
Ans:
viscosity
Explanation :
It happens because of viscosity. The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress. It is due to friction between neighboring parcels of the fluid that are moving at different velocities.
[7] In Astrophysics, what name is given to a hypothetical hole in outer space from which stars and energy emerge?
A.
Black hole
B.
Ozone hole
C.
Asteroid belt
D.
White hole
Ans:
White hole
Explanation :
A White Hole is a hypothetical hole in outer space from which energy, stars, and other celestial matter emerge or explode. It is a theoretical celestial object into which matter is funneled from a black hole.
[8] The Laser is a beam of radiations which are –
A.
Non-coherent and monochromatic
B.
Coherent and monochromatic
C.
Non-coherent and non-monochromatic
D.
Coherent and non-monochromatic
Ans:
Coherent and monochromatic
Explanation :
Laser, an acronym for Light Amplification by Stimulated Emission of Radiation, creates a radiation beam that is coherent (in-phase). In a coherent light source, the amplitude of the radiated waves is added and results in a radiation beam of great intensity. It normally produces only one or two wavelengths.
[9] Ice float on water because its density is -
A.
more than water
B.
less than water
C.
zero
D.
same as water
Ans:
less than water
Explanation :
Archimedes' Principle states that for an object to floaton water, it must displace an equal amount of water. Ice floats because it is about 9% less dense than liquid water.
[10] Distances of stars are measured in –
A.
Galactic unit
B.
Stellar mile
C.
Cosmic kilometre
D.
Light year
Ans:
Light year
Explanation :
Light year is a unit of length used informally to express astronomical distances. It is most often used when expressing distances to stars and other distances on a galactic scale. It is equal to just under 10 trillion kilometres.
[11] Loudness of sound depends on –
A.
Frequency
B.
Wavelength
C.
Amplitude
D.
Pitch
Ans:
Amplitude
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[12] A man jumping out of a moving train is thrown -
A.
forward
B.
backward
C.
sideways
D.
None of these
Ans:
forward
Explanation :
At the time of jumping out he has the same velocity as the moving train.
[13] Blowing Air with open pipe is an example of –
A.
isothermal process
B.
isochroric process
C.
Isobaric process
D.
Adiabatic process
Ans:
Isobaric process
Explanation :
When air is suddenly exhaled out into a larger volume through the narrow opening, air undergo adiabatic expansion. So blowing air is an adiabatic process. But since it is open pipe, the pressure inside and pressure outside remains same.
[14] The amount of matter in a ball of steel is its –
A.
Weight
B.
Mass
C.
Density
D.
Volume
Ans:
Mass
Explanation :
In simple terms, mass is the amount of matter in an object, and is measured in grams. Under normal circumstances, and as long as it remains intact, an object will always have the same mass, i.e. there will always be the same amount of matter in it.
[15] When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will:
A.
remain same
B.
double
C.
three times
D.
four times
Ans:
double
Explanation :
According to Newton's law of cooling, the rate of loss of heat of a body is directly proportional to the difference between the temperature of hot body and temperature of the surroundings, provided that the difference in temperature is small enough.
[16] The weight of a body at the centre of earth is:
A.
half the weight at the surface
B.
zero
C.
twice the weight at the surface
D.
infinite
Ans:
zero
Explanation :
Weight of a body is the force with which it is attracted towards the centre of earth. The weight of a body, 'w' of mass `m' is given by: W = mg, where `g is the acceleration due to gravity At the centre of earth, value of 'g' is zero. Therefore, weight of a body is zero at the centre of the earth.
[17] The component used for tuning a radio is basically a variable –
A.
Resistor
B.
Condenser
C.
Inductor
D.
Transformer
Ans:
Condenser
Explanation :
A tuning capacitor or tuning condenser is a variable capacitor used in an electronic circuit of a radio. It usually connects in parallel to a loop antenna and its capacitance may be intentionally and repeatedly changed mechanically or electronically.
[18] 0°K, is equivalent to –
A.
273°C
B.
-273°C
C.
0°C
D.
100°C
Ans:
-273°C
Explanation :
0 degrees Kelvin is equal to -273.15 degrees Celsius. It is the lowest possible temperature, at which all molecules are have the least possible amount of kinetic energy.
[19] What type of force acts on a car moving around a curve?
A.
Centrifugal force
B.
Cohesive force
C.
Centripetal force
D.
Gravitational force
Ans:
Centripetal force
Explanation :
Any object moving in a circle (or along a circular path) experiences a centripetal force. It is this physical force that pushes or pulls the object towards the center of the circle. In the case of a car moving along a curve, as it makes a turn, the force of friction acting upon the turned wheels of the car provides centripetal force required for circular motion.
[20] Which one among the following is not an electromagnetic wave?
A.
X-Ray
B.
R-Ray
C.
Cathode Ray
D.
Infrared Ray
Ans:
Cathode Ray
Explanation :
In physics, electromagnetic radiation (EMR) refers to the waves (or their quanta, photons) of the electro-magnetic field, propagating (radiating) through space carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-, and gamma radiation.
[21] Which one of the following is a good electrical conductor?
A.
Graphite
B.
Diamond
C.
Peat
D.
Charcoal
Ans:
Graphite
Explanation :
Graphite is a good conductor of electricity because its electrons are delocalized or free to move around. Each carbon atom in graphite is directly linked to only three carbon atoms through covalent bonds. Therefore, out of the four valence electrons in a car-bon atom, only three are used for bonding and the fourth is relatively free and can move from one car-bon atom to the other.
[22] Which °fine metals has the maximum thermal conductivity?
A.
Iron
B.
Aluminium
C.
Silver
D.
Copper
Ans:
Silver
Explanation :
Silver has the best thermal conductivity of 429 W/mK at RT (295K). It is followed by copper, gold and aluminum. Metals generally have very good electrical conductivity, that leads to high thermal conductivity.
[23] What do radioactive substances emit?
A.
Radio waves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ rays
Ans:
α, β and γ rays
Explanation :
Of the three main types of radiation given off during radioactive decay, two are particles and one is energy; scientists call them alpha, beta and gamma after the first three letters of the Greek alphabet.
[24] The term ‘Higgs Boson' is associated with –
A.
Nano Technology
B.
Oncology
C.
God Particle
D.
Stem Cell Research
Ans:
God Particle
Explanation :
The Higgs boson is an elementary particle in the Standard Model of particle physics. That is often referred to as the "God particle" in popular media out-side the scientific community.
[25] Addition of suitable impurities into semiconductor, is called –
A.
Doping
B.
Mixing
C.
Forming
D.
Diluting
Ans:
Doping
Explanation :
In semiconductor production, doping refers to the introduction of impurities into an extremely pure intrinsic semiconductor for the purpose of modulating its electrical properties. The impurities are dependent upon the type of semiconductor and the properties that it needs to have for its intended purpose.
Explanation :
A White Hole is a hypothetical hole in outer space from which energy, stars, and other celestial matter emerge or explode. It is a theoretical celestial object into which matter is funneled from a black hole.
[8] The Laser is a beam of radiations which are –
A.
Non-coherent and monochromatic
B.
Coherent and monochromatic
C.
Non-coherent and non-monochromatic
D.
Coherent and non-monochromatic
Ans:
Coherent and monochromatic
Explanation :
Laser, an acronym for Light Amplification by Stimulated Emission of Radiation, creates a radiation beam that is coherent (in-phase). In a coherent light source, the amplitude of the radiated waves is added and results in a radiation beam of great intensity. It normally produces only one or two wavelengths.
[9] Ice float on water because its density is -
A.
more than water
B.
less than water
C.
zero
D.
same as water
Ans:
less than water
Explanation :
Archimedes' Principle states that for an object to floaton water, it must displace an equal amount of water. Ice floats because it is about 9% less dense than liquid water.
[10] Distances of stars are measured in –
A.
Galactic unit
B.
Stellar mile
C.
Cosmic kilometre
D.
Light year
Ans:
Light year
Explanation :
Light year is a unit of length used informally to express astronomical distances. It is most often used when expressing distances to stars and other distances on a galactic scale. It is equal to just under 10 trillion kilometres.
[11] Loudness of sound depends on –
A.
Frequency
B.
Wavelength
C.
Amplitude
D.
Pitch
Ans:
Amplitude
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[12] A man jumping out of a moving train is thrown -
A.
forward
B.
backward
C.
sideways
D.
None of these
Ans:
forward
Explanation :
At the time of jumping out he has the same velocity as the moving train.
[13] Blowing Air with open pipe is an example of –
A.
isothermal process
B.
isochroric process
C.
Isobaric process
D.
Adiabatic process
Ans:
Isobaric process
Explanation :
When air is suddenly exhaled out into a larger volume through the narrow opening, air undergo adiabatic expansion. So blowing air is an adiabatic process. But since it is open pipe, the pressure inside and pressure outside remains same.
[14] The amount of matter in a ball of steel is its –
A.
Weight
B.
Mass
C.
Density
D.
Volume
Ans:
Mass
Explanation :
In simple terms, mass is the amount of matter in an object, and is measured in grams. Under normal circumstances, and as long as it remains intact, an object will always have the same mass, i.e. there will always be the same amount of matter in it.
[15] When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will:
A.
remain same
B.
double
C.
three times
D.
four times
Ans:
double
Explanation :
According to Newton's law of cooling, the rate of loss of heat of a body is directly proportional to the difference between the temperature of hot body and temperature of the surroundings, provided that the difference in temperature is small enough.
[16] The weight of a body at the centre of earth is:
A.
half the weight at the surface
B.
zero
C.
twice the weight at the surface
D.
infinite
Ans:
zero
Explanation :
Weight of a body is the force with which it is attracted towards the centre of earth. The weight of a body, 'w' of mass `m' is given by: W = mg, where `g is the acceleration due to gravity At the centre of earth, value of 'g' is zero. Therefore, weight of a body is zero at the centre of the earth.
[17] The component used for tuning a radio is basically a variable –
A.
Resistor
B.
Condenser
C.
Inductor
D.
Transformer
Ans:
Condenser
Explanation :
A tuning capacitor or tuning condenser is a variable capacitor used in an electronic circuit of a radio. It usually connects in parallel to a loop antenna and its capacitance may be intentionally and repeatedly changed mechanically or electronically.
[18] 0°K, is equivalent to –
A.
273°C
B.
-273°C
C.
0°C
D.
100°C
Ans:
-273°C
Explanation :
0 degrees Kelvin is equal to -273.15 degrees Celsius. It is the lowest possible temperature, at which all molecules are have the least possible amount of kinetic energy.
[19] What type of force acts on a car moving around a curve?
A.
Centrifugal force
B.
Cohesive force
C.
Centripetal force
D.
Gravitational force
Ans:
Centripetal force
Explanation :
Any object moving in a circle (or along a circular path) experiences a centripetal force. It is this physical force that pushes or pulls the object towards the center of the circle. In the case of a car moving along a curve, as it makes a turn, the force of friction acting upon the turned wheels of the car provides centripetal force required for circular motion.
[20] Which one among the following is not an electromagnetic wave?
A.
X-Ray
B.
R-Ray
C.
Cathode Ray
D.
Infrared Ray
Ans:
Cathode Ray
Explanation :
In physics, electromagnetic radiation (EMR) refers to the waves (or their quanta, photons) of the electro-magnetic field, propagating (radiating) through space carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-, and gamma radiation.
[21] Which one of the following is a good electrical conductor?
A.
Graphite
B.
Diamond
C.
Peat
D.
Charcoal
Ans:
Graphite
Explanation :
Graphite is a good conductor of electricity because its electrons are delocalized or free to move around. Each carbon atom in graphite is directly linked to only three carbon atoms through covalent bonds. Therefore, out of the four valence electrons in a car-bon atom, only three are used for bonding and the fourth is relatively free and can move from one car-bon atom to the other.
[22] Which °fine metals has the maximum thermal conductivity?
A.
Iron
B.
Aluminium
C.
Silver
D.
Copper
Ans:
Silver
Explanation :
Silver has the best thermal conductivity of 429 W/mK at RT (295K). It is followed by copper, gold and aluminum. Metals generally have very good electrical conductivity, that leads to high thermal conductivity.
[23] What do radioactive substances emit?
A.
Radio waves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ rays
Ans:
α, β and γ rays
Explanation :
Of the three main types of radiation given off during radioactive decay, two are particles and one is energy; scientists call them alpha, beta and gamma after the first three letters of the Greek alphabet.
[24] The term ‘Higgs Boson' is associated with –
A.
Nano Technology
B.
Oncology
C.
God Particle
D.
Stem Cell Research
Ans:
God Particle
Explanation :
The Higgs boson is an elementary particle in the Standard Model of particle physics. That is often referred to as the "God particle" in popular media out-side the scientific community.
[25] Addition of suitable impurities into semiconductor, is called –
A.
Doping
B.
Mixing
C.
Forming
D.
Diluting
Ans:
Doping
Explanation :
In semiconductor production, doping refers to the introduction of impurities into an extremely pure intrinsic semiconductor for the purpose of modulating its electrical properties. The impurities are dependent upon the type of semiconductor and the properties that it needs to have for its intended purpose.
Explanation :
Archimedes' Principle states that for an object to floaton water, it must displace an equal amount of water. Ice floats because it is about 9% less dense than liquid water.
[10] Distances of stars are measured in –
A.
Galactic unit
B.
Stellar mile
C.
Cosmic kilometre
D.
Light year
Ans:
Light year
Explanation :
Light year is a unit of length used informally to express astronomical distances. It is most often used when expressing distances to stars and other distances on a galactic scale. It is equal to just under 10 trillion kilometres.
[11] Loudness of sound depends on –
A.
Frequency
B.
Wavelength
C.
Amplitude
D.
Pitch
Ans:
Amplitude
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[12] A man jumping out of a moving train is thrown -
A.
forward
B.
backward
C.
sideways
D.
None of these
Ans:
forward
Explanation :
At the time of jumping out he has the same velocity as the moving train.
[13] Blowing Air with open pipe is an example of –
A.
isothermal process
B.
isochroric process
C.
Isobaric process
D.
Adiabatic process
Ans:
Isobaric process
Explanation :
When air is suddenly exhaled out into a larger volume through the narrow opening, air undergo adiabatic expansion. So blowing air is an adiabatic process. But since it is open pipe, the pressure inside and pressure outside remains same.
[14] The amount of matter in a ball of steel is its –
A.
Weight
B.
Mass
C.
Density
D.
Volume
Ans:
Mass
Explanation :
In simple terms, mass is the amount of matter in an object, and is measured in grams. Under normal circumstances, and as long as it remains intact, an object will always have the same mass, i.e. there will always be the same amount of matter in it.
[15] When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will:
A.
remain same
B.
double
C.
three times
D.
four times
Ans:
double
Explanation :
According to Newton's law of cooling, the rate of loss of heat of a body is directly proportional to the difference between the temperature of hot body and temperature of the surroundings, provided that the difference in temperature is small enough.
[16] The weight of a body at the centre of earth is:
A.
half the weight at the surface
B.
zero
C.
twice the weight at the surface
D.
infinite
Ans:
zero
Explanation :
Weight of a body is the force with which it is attracted towards the centre of earth. The weight of a body, 'w' of mass `m' is given by: W = mg, where `g is the acceleration due to gravity At the centre of earth, value of 'g' is zero. Therefore, weight of a body is zero at the centre of the earth.
[17] The component used for tuning a radio is basically a variable –
A.
Resistor
B.
Condenser
C.
Inductor
D.
Transformer
Ans:
Condenser
Explanation :
A tuning capacitor or tuning condenser is a variable capacitor used in an electronic circuit of a radio. It usually connects in parallel to a loop antenna and its capacitance may be intentionally and repeatedly changed mechanically or electronically.
[18] 0°K, is equivalent to –
A.
273°C
B.
-273°C
C.
0°C
D.
100°C
Ans:
-273°C
Explanation :
0 degrees Kelvin is equal to -273.15 degrees Celsius. It is the lowest possible temperature, at which all molecules are have the least possible amount of kinetic energy.
[19] What type of force acts on a car moving around a curve?
A.
Centrifugal force
B.
Cohesive force
C.
Centripetal force
D.
Gravitational force
Ans:
Centripetal force
Explanation :
Any object moving in a circle (or along a circular path) experiences a centripetal force. It is this physical force that pushes or pulls the object towards the center of the circle. In the case of a car moving along a curve, as it makes a turn, the force of friction acting upon the turned wheels of the car provides centripetal force required for circular motion.
[20] Which one among the following is not an electromagnetic wave?
A.
X-Ray
B.
R-Ray
C.
Cathode Ray
D.
Infrared Ray
Ans:
Cathode Ray
Explanation :
In physics, electromagnetic radiation (EMR) refers to the waves (or their quanta, photons) of the electro-magnetic field, propagating (radiating) through space carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-, and gamma radiation.
[21] Which one of the following is a good electrical conductor?
A.
Graphite
B.
Diamond
C.
Peat
D.
Charcoal
Ans:
Graphite
Explanation :
Graphite is a good conductor of electricity because its electrons are delocalized or free to move around. Each carbon atom in graphite is directly linked to only three carbon atoms through covalent bonds. Therefore, out of the four valence electrons in a car-bon atom, only three are used for bonding and the fourth is relatively free and can move from one car-bon atom to the other.
[22] Which °fine metals has the maximum thermal conductivity?
A.
Iron
B.
Aluminium
C.
Silver
D.
Copper
Ans:
Silver
Explanation :
Silver has the best thermal conductivity of 429 W/mK at RT (295K). It is followed by copper, gold and aluminum. Metals generally have very good electrical conductivity, that leads to high thermal conductivity.
[23] What do radioactive substances emit?
A.
Radio waves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ rays
Ans:
α, β and γ rays
Explanation :
Of the three main types of radiation given off during radioactive decay, two are particles and one is energy; scientists call them alpha, beta and gamma after the first three letters of the Greek alphabet.
[24] The term ‘Higgs Boson' is associated with –
A.
Nano Technology
B.
Oncology
C.
God Particle
D.
Stem Cell Research
Ans:
God Particle
Explanation :
The Higgs boson is an elementary particle in the Standard Model of particle physics. That is often referred to as the "God particle" in popular media out-side the scientific community.
[25] Addition of suitable impurities into semiconductor, is called –
A.
Doping
B.
Mixing
C.
Forming
D.
Diluting
Ans:
Doping
Explanation :
In semiconductor production, doping refers to the introduction of impurities into an extremely pure intrinsic semiconductor for the purpose of modulating its electrical properties. The impurities are dependent upon the type of semiconductor and the properties that it needs to have for its intended purpose.
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[12] A man jumping out of a moving train is thrown -
A.
forward
B.
backward
C.
sideways
D.
None of these
Ans:
forward
Explanation :
At the time of jumping out he has the same velocity as the moving train.
[13] Blowing Air with open pipe is an example of –
A.
isothermal process
B.
isochroric process
C.
Isobaric process
D.
Adiabatic process
Ans:
Isobaric process
Explanation :
When air is suddenly exhaled out into a larger volume through the narrow opening, air undergo adiabatic expansion. So blowing air is an adiabatic process. But since it is open pipe, the pressure inside and pressure outside remains same.
[14] The amount of matter in a ball of steel is its –
A.
Weight
B.
Mass
C.
Density
D.
Volume
Ans:
Mass
Explanation :
In simple terms, mass is the amount of matter in an object, and is measured in grams. Under normal circumstances, and as long as it remains intact, an object will always have the same mass, i.e. there will always be the same amount of matter in it.
[15] When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will:
A.
remain same
B.
double
C.
three times
D.
four times
Ans:
double
Explanation :
According to Newton's law of cooling, the rate of loss of heat of a body is directly proportional to the difference between the temperature of hot body and temperature of the surroundings, provided that the difference in temperature is small enough.
[16] The weight of a body at the centre of earth is:
A.
half the weight at the surface
B.
zero
C.
twice the weight at the surface
D.
infinite
Ans:
zero
Explanation :
Weight of a body is the force with which it is attracted towards the centre of earth. The weight of a body, 'w' of mass `m' is given by: W = mg, where `g is the acceleration due to gravity At the centre of earth, value of 'g' is zero. Therefore, weight of a body is zero at the centre of the earth.
[17] The component used for tuning a radio is basically a variable –
A.
Resistor
B.
Condenser
C.
Inductor
D.
Transformer
Ans:
Condenser
Explanation :
A tuning capacitor or tuning condenser is a variable capacitor used in an electronic circuit of a radio. It usually connects in parallel to a loop antenna and its capacitance may be intentionally and repeatedly changed mechanically or electronically.
[18] 0°K, is equivalent to –
A.
273°C
B.
-273°C
C.
0°C
D.
100°C
Ans:
-273°C
Explanation :
0 degrees Kelvin is equal to -273.15 degrees Celsius. It is the lowest possible temperature, at which all molecules are have the least possible amount of kinetic energy.
[19] What type of force acts on a car moving around a curve?
A.
Centrifugal force
B.
Cohesive force
C.
Centripetal force
D.
Gravitational force
Ans:
Centripetal force
Explanation :
Any object moving in a circle (or along a circular path) experiences a centripetal force. It is this physical force that pushes or pulls the object towards the center of the circle. In the case of a car moving along a curve, as it makes a turn, the force of friction acting upon the turned wheels of the car provides centripetal force required for circular motion.
[20] Which one among the following is not an electromagnetic wave?
A.
X-Ray
B.
R-Ray
C.
Cathode Ray
D.
Infrared Ray
Ans:
Cathode Ray
Explanation :
In physics, electromagnetic radiation (EMR) refers to the waves (or their quanta, photons) of the electro-magnetic field, propagating (radiating) through space carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-, and gamma radiation.
[21] Which one of the following is a good electrical conductor?
A.
Graphite
B.
Diamond
C.
Peat
D.
Charcoal
Ans:
Graphite
Explanation :
Graphite is a good conductor of electricity because its electrons are delocalized or free to move around. Each carbon atom in graphite is directly linked to only three carbon atoms through covalent bonds. Therefore, out of the four valence electrons in a car-bon atom, only three are used for bonding and the fourth is relatively free and can move from one car-bon atom to the other.
[22] Which °fine metals has the maximum thermal conductivity?
A.
Iron
B.
Aluminium
C.
Silver
D.
Copper
Ans:
Silver
Explanation :
Silver has the best thermal conductivity of 429 W/mK at RT (295K). It is followed by copper, gold and aluminum. Metals generally have very good electrical conductivity, that leads to high thermal conductivity.
[23] What do radioactive substances emit?
A.
Radio waves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ rays
Ans:
α, β and γ rays
Explanation :
Of the three main types of radiation given off during radioactive decay, two are particles and one is energy; scientists call them alpha, beta and gamma after the first three letters of the Greek alphabet.
[24] The term ‘Higgs Boson' is associated with –
A.
Nano Technology
B.
Oncology
C.
God Particle
D.
Stem Cell Research
Ans:
God Particle
Explanation :
The Higgs boson is an elementary particle in the Standard Model of particle physics. That is often referred to as the "God particle" in popular media out-side the scientific community.
[25] Addition of suitable impurities into semiconductor, is called –
A.
Doping
B.
Mixing
C.
Forming
D.
Diluting
Ans:
Doping
Explanation :
In semiconductor production, doping refers to the introduction of impurities into an extremely pure intrinsic semiconductor for the purpose of modulating its electrical properties. The impurities are dependent upon the type of semiconductor and the properties that it needs to have for its intended purpose.
Explanation :
When air is suddenly exhaled out into a larger volume through the narrow opening, air undergo adiabatic expansion. So blowing air is an adiabatic process. But since it is open pipe, the pressure inside and pressure outside remains same.
[14] The amount of matter in a ball of steel is its –
A.
Weight
B.
Mass
C.
Density
D.
Volume
Ans:
Mass
Explanation :
In simple terms, mass is the amount of matter in an object, and is measured in grams. Under normal circumstances, and as long as it remains intact, an object will always have the same mass, i.e. there will always be the same amount of matter in it.
[15] When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will:
A.
remain same
B.
double
C.
three times
D.
four times
Ans:
double
Explanation :
According to Newton's law of cooling, the rate of loss of heat of a body is directly proportional to the difference between the temperature of hot body and temperature of the surroundings, provided that the difference in temperature is small enough.
[16] The weight of a body at the centre of earth is:
A.
half the weight at the surface
B.
zero
C.
twice the weight at the surface
D.
infinite
Ans:
zero
Explanation :
Weight of a body is the force with which it is attracted towards the centre of earth. The weight of a body, 'w' of mass `m' is given by: W = mg, where `g is the acceleration due to gravity At the centre of earth, value of 'g' is zero. Therefore, weight of a body is zero at the centre of the earth.
[17] The component used for tuning a radio is basically a variable –
A.
Resistor
B.
Condenser
C.
Inductor
D.
Transformer
Ans:
Condenser
Explanation :
A tuning capacitor or tuning condenser is a variable capacitor used in an electronic circuit of a radio. It usually connects in parallel to a loop antenna and its capacitance may be intentionally and repeatedly changed mechanically or electronically.
[18] 0°K, is equivalent to –
A.
273°C
B.
-273°C
C.
0°C
D.
100°C
Ans:
-273°C
Explanation :
0 degrees Kelvin is equal to -273.15 degrees Celsius. It is the lowest possible temperature, at which all molecules are have the least possible amount of kinetic energy.
[19] What type of force acts on a car moving around a curve?
A.
Centrifugal force
B.
Cohesive force
C.
Centripetal force
D.
Gravitational force
Ans:
Centripetal force
Explanation :
Any object moving in a circle (or along a circular path) experiences a centripetal force. It is this physical force that pushes or pulls the object towards the center of the circle. In the case of a car moving along a curve, as it makes a turn, the force of friction acting upon the turned wheels of the car provides centripetal force required for circular motion.
[20] Which one among the following is not an electromagnetic wave?
A.
X-Ray
B.
R-Ray
C.
Cathode Ray
D.
Infrared Ray
Ans:
Cathode Ray
Explanation :
In physics, electromagnetic radiation (EMR) refers to the waves (or their quanta, photons) of the electro-magnetic field, propagating (radiating) through space carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-, and gamma radiation.
[21] Which one of the following is a good electrical conductor?
A.
Graphite
B.
Diamond
C.
Peat
D.
Charcoal
Ans:
Graphite
Explanation :
Graphite is a good conductor of electricity because its electrons are delocalized or free to move around. Each carbon atom in graphite is directly linked to only three carbon atoms through covalent bonds. Therefore, out of the four valence electrons in a car-bon atom, only three are used for bonding and the fourth is relatively free and can move from one car-bon atom to the other.
[22] Which °fine metals has the maximum thermal conductivity?
A.
Iron
B.
Aluminium
C.
Silver
D.
Copper
Ans:
Silver
Explanation :
Silver has the best thermal conductivity of 429 W/mK at RT (295K). It is followed by copper, gold and aluminum. Metals generally have very good electrical conductivity, that leads to high thermal conductivity.
[23] What do radioactive substances emit?
A.
Radio waves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ rays
Ans:
α, β and γ rays
Explanation :
Of the three main types of radiation given off during radioactive decay, two are particles and one is energy; scientists call them alpha, beta and gamma after the first three letters of the Greek alphabet.
[24] The term ‘Higgs Boson' is associated with –
A.
Nano Technology
B.
Oncology
C.
God Particle
D.
Stem Cell Research
Ans:
God Particle
Explanation :
The Higgs boson is an elementary particle in the Standard Model of particle physics. That is often referred to as the "God particle" in popular media out-side the scientific community.
[25] Addition of suitable impurities into semiconductor, is called –
A.
Doping
B.
Mixing
C.
Forming
D.
Diluting
Ans:
Doping
Explanation :
In semiconductor production, doping refers to the introduction of impurities into an extremely pure intrinsic semiconductor for the purpose of modulating its electrical properties. The impurities are dependent upon the type of semiconductor and the properties that it needs to have for its intended purpose.
Explanation :
According to Newton's law of cooling, the rate of loss of heat of a body is directly proportional to the difference between the temperature of hot body and temperature of the surroundings, provided that the difference in temperature is small enough.
[16] The weight of a body at the centre of earth is:
A.
half the weight at the surface
B.
zero
C.
twice the weight at the surface
D.
infinite
Ans:
zero
Explanation :
Weight of a body is the force with which it is attracted towards the centre of earth. The weight of a body, 'w' of mass `m' is given by: W = mg, where `g is the acceleration due to gravity At the centre of earth, value of 'g' is zero. Therefore, weight of a body is zero at the centre of the earth.
[17] The component used for tuning a radio is basically a variable –
A.
Resistor
B.
Condenser
C.
Inductor
D.
Transformer
Ans:
Condenser
Explanation :
A tuning capacitor or tuning condenser is a variable capacitor used in an electronic circuit of a radio. It usually connects in parallel to a loop antenna and its capacitance may be intentionally and repeatedly changed mechanically or electronically.
[18] 0°K, is equivalent to –
A.
273°C
B.
-273°C
C.
0°C
D.
100°C
Ans:
-273°C
Explanation :
0 degrees Kelvin is equal to -273.15 degrees Celsius. It is the lowest possible temperature, at which all molecules are have the least possible amount of kinetic energy.
[19] What type of force acts on a car moving around a curve?
A.
Centrifugal force
B.
Cohesive force
C.
Centripetal force
D.
Gravitational force
Ans:
Centripetal force
Explanation :
Any object moving in a circle (or along a circular path) experiences a centripetal force. It is this physical force that pushes or pulls the object towards the center of the circle. In the case of a car moving along a curve, as it makes a turn, the force of friction acting upon the turned wheels of the car provides centripetal force required for circular motion.
[20] Which one among the following is not an electromagnetic wave?
A.
X-Ray
B.
R-Ray
C.
Cathode Ray
D.
Infrared Ray
Ans:
Cathode Ray
Explanation :
In physics, electromagnetic radiation (EMR) refers to the waves (or their quanta, photons) of the electro-magnetic field, propagating (radiating) through space carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-, and gamma radiation.
[21] Which one of the following is a good electrical conductor?
A.
Graphite
B.
Diamond
C.
Peat
D.
Charcoal
Ans:
Graphite
Explanation :
Graphite is a good conductor of electricity because its electrons are delocalized or free to move around. Each carbon atom in graphite is directly linked to only three carbon atoms through covalent bonds. Therefore, out of the four valence electrons in a car-bon atom, only three are used for bonding and the fourth is relatively free and can move from one car-bon atom to the other.
[22] Which °fine metals has the maximum thermal conductivity?
A.
Iron
B.
Aluminium
C.
Silver
D.
Copper
Ans:
Silver
Explanation :
Silver has the best thermal conductivity of 429 W/mK at RT (295K). It is followed by copper, gold and aluminum. Metals generally have very good electrical conductivity, that leads to high thermal conductivity.
[23] What do radioactive substances emit?
A.
Radio waves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ rays
Ans:
α, β and γ rays
Explanation :
Of the three main types of radiation given off during radioactive decay, two are particles and one is energy; scientists call them alpha, beta and gamma after the first three letters of the Greek alphabet.
[24] The term ‘Higgs Boson' is associated with –
A.
Nano Technology
B.
Oncology
C.
God Particle
D.
Stem Cell Research
Ans:
God Particle
Explanation :
The Higgs boson is an elementary particle in the Standard Model of particle physics. That is often referred to as the "God particle" in popular media out-side the scientific community.
[25] Addition of suitable impurities into semiconductor, is called –
A.
Doping
B.
Mixing
C.
Forming
D.
Diluting
Ans:
Doping
Explanation :
In semiconductor production, doping refers to the introduction of impurities into an extremely pure intrinsic semiconductor for the purpose of modulating its electrical properties. The impurities are dependent upon the type of semiconductor and the properties that it needs to have for its intended purpose.
Explanation :
A tuning capacitor or tuning condenser is a variable capacitor used in an electronic circuit of a radio. It usually connects in parallel to a loop antenna and its capacitance may be intentionally and repeatedly changed mechanically or electronically.
[18] 0°K, is equivalent to –
A.
273°C
B.
-273°C
C.
0°C
D.
100°C
Ans:
-273°C
Explanation :
0 degrees Kelvin is equal to -273.15 degrees Celsius. It is the lowest possible temperature, at which all molecules are have the least possible amount of kinetic energy.
[19] What type of force acts on a car moving around a curve?
A.
Centrifugal force
B.
Cohesive force
C.
Centripetal force
D.
Gravitational force
Ans:
Centripetal force
Explanation :
Any object moving in a circle (or along a circular path) experiences a centripetal force. It is this physical force that pushes or pulls the object towards the center of the circle. In the case of a car moving along a curve, as it makes a turn, the force of friction acting upon the turned wheels of the car provides centripetal force required for circular motion.
[20] Which one among the following is not an electromagnetic wave?
A.
X-Ray
B.
R-Ray
C.
Cathode Ray
D.
Infrared Ray
Ans:
Cathode Ray
Explanation :
In physics, electromagnetic radiation (EMR) refers to the waves (or their quanta, photons) of the electro-magnetic field, propagating (radiating) through space carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-, and gamma radiation.
[21] Which one of the following is a good electrical conductor?
A.
Graphite
B.
Diamond
C.
Peat
D.
Charcoal
Ans:
Graphite
Explanation :
Graphite is a good conductor of electricity because its electrons are delocalized or free to move around. Each carbon atom in graphite is directly linked to only three carbon atoms through covalent bonds. Therefore, out of the four valence electrons in a car-bon atom, only three are used for bonding and the fourth is relatively free and can move from one car-bon atom to the other.
[22] Which °fine metals has the maximum thermal conductivity?
A.
Iron
B.
Aluminium
C.
Silver
D.
Copper
Ans:
Silver
Explanation :
Silver has the best thermal conductivity of 429 W/mK at RT (295K). It is followed by copper, gold and aluminum. Metals generally have very good electrical conductivity, that leads to high thermal conductivity.
[23] What do radioactive substances emit?
A.
Radio waves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ rays
Ans:
α, β and γ rays
Explanation :
Of the three main types of radiation given off during radioactive decay, two are particles and one is energy; scientists call them alpha, beta and gamma after the first three letters of the Greek alphabet.
[24] The term ‘Higgs Boson' is associated with –
A.
Nano Technology
B.
Oncology
C.
God Particle
D.
Stem Cell Research
Ans:
God Particle
Explanation :
The Higgs boson is an elementary particle in the Standard Model of particle physics. That is often referred to as the "God particle" in popular media out-side the scientific community.
[25] Addition of suitable impurities into semiconductor, is called –
A.
Doping
B.
Mixing
C.
Forming
D.
Diluting
Ans:
Doping
Explanation :
In semiconductor production, doping refers to the introduction of impurities into an extremely pure intrinsic semiconductor for the purpose of modulating its electrical properties. The impurities are dependent upon the type of semiconductor and the properties that it needs to have for its intended purpose.
Explanation :
Any object moving in a circle (or along a circular path) experiences a centripetal force. It is this physical force that pushes or pulls the object towards the center of the circle. In the case of a car moving along a curve, as it makes a turn, the force of friction acting upon the turned wheels of the car provides centripetal force required for circular motion.
[20] Which one among the following is not an electromagnetic wave?
A.
X-Ray
B.
R-Ray
C.
Cathode Ray
D.
Infrared Ray
Ans:
Cathode Ray
Explanation :
In physics, electromagnetic radiation (EMR) refers to the waves (or their quanta, photons) of the electro-magnetic field, propagating (radiating) through space carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-, and gamma radiation.
[21] Which one of the following is a good electrical conductor?
A.
Graphite
B.
Diamond
C.
Peat
D.
Charcoal
Ans:
Graphite
Explanation :
Graphite is a good conductor of electricity because its electrons are delocalized or free to move around. Each carbon atom in graphite is directly linked to only three carbon atoms through covalent bonds. Therefore, out of the four valence electrons in a car-bon atom, only three are used for bonding and the fourth is relatively free and can move from one car-bon atom to the other.
[22] Which °fine metals has the maximum thermal conductivity?
A.
Iron
B.
Aluminium
C.
Silver
D.
Copper
Ans:
Silver
Explanation :
Silver has the best thermal conductivity of 429 W/mK at RT (295K). It is followed by copper, gold and aluminum. Metals generally have very good electrical conductivity, that leads to high thermal conductivity.
[23] What do radioactive substances emit?
A.
Radio waves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ rays
Ans:
α, β and γ rays
Explanation :
Of the three main types of radiation given off during radioactive decay, two are particles and one is energy; scientists call them alpha, beta and gamma after the first three letters of the Greek alphabet.
[24] The term ‘Higgs Boson' is associated with –
A.
Nano Technology
B.
Oncology
C.
God Particle
D.
Stem Cell Research
Ans:
God Particle
Explanation :
The Higgs boson is an elementary particle in the Standard Model of particle physics. That is often referred to as the "God particle" in popular media out-side the scientific community.
[25] Addition of suitable impurities into semiconductor, is called –
A.
Doping
B.
Mixing
C.
Forming
D.
Diluting
Ans:
Doping
Explanation :
In semiconductor production, doping refers to the introduction of impurities into an extremely pure intrinsic semiconductor for the purpose of modulating its electrical properties. The impurities are dependent upon the type of semiconductor and the properties that it needs to have for its intended purpose.
Explanation :
Graphite is a good conductor of electricity because its electrons are delocalized or free to move around. Each carbon atom in graphite is directly linked to only three carbon atoms through covalent bonds. Therefore, out of the four valence electrons in a car-bon atom, only three are used for bonding and the fourth is relatively free and can move from one car-bon atom to the other.
[22] Which °fine metals has the maximum thermal conductivity?
A.
Iron
B.
Aluminium
C.
Silver
D.
Copper
Ans:
Silver
Explanation :
Silver has the best thermal conductivity of 429 W/mK at RT (295K). It is followed by copper, gold and aluminum. Metals generally have very good electrical conductivity, that leads to high thermal conductivity.
[23] What do radioactive substances emit?
A.
Radio waves
B.
Infrared waves
C.
Ultraviolet waves
D.
α, β and γ rays
Ans:
α, β and γ rays
Explanation :
Of the three main types of radiation given off during radioactive decay, two are particles and one is energy; scientists call them alpha, beta and gamma after the first three letters of the Greek alphabet.
[24] The term ‘Higgs Boson' is associated with –
A.
Nano Technology
B.
Oncology
C.
God Particle
D.
Stem Cell Research
Ans:
God Particle
Explanation :
The Higgs boson is an elementary particle in the Standard Model of particle physics. That is often referred to as the "God particle" in popular media out-side the scientific community.
[25] Addition of suitable impurities into semiconductor, is called –
A.
Doping
B.
Mixing
C.
Forming
D.
Diluting
Ans:
Doping
Explanation :
In semiconductor production, doping refers to the introduction of impurities into an extremely pure intrinsic semiconductor for the purpose of modulating its electrical properties. The impurities are dependent upon the type of semiconductor and the properties that it needs to have for its intended purpose.
Explanation :
Of the three main types of radiation given off during radioactive decay, two are particles and one is energy; scientists call them alpha, beta and gamma after the first three letters of the Greek alphabet.
[24] The term ‘Higgs Boson' is associated with –
A.
Nano Technology
B.
Oncology
C.
God Particle
D.
Stem Cell Research
Ans:
God Particle
Explanation :
The Higgs boson is an elementary particle in the Standard Model of particle physics. That is often referred to as the "God particle" in popular media out-side the scientific community.
[25] Addition of suitable impurities into semiconductor, is called –
A.
Doping
B.
Mixing
C.
Forming
D.
Diluting
Ans:
Doping
Explanation :
In semiconductor production, doping refers to the introduction of impurities into an extremely pure intrinsic semiconductor for the purpose of modulating its electrical properties. The impurities are dependent upon the type of semiconductor and the properties that it needs to have for its intended purpose.
Explanation :
In semiconductor production, doping refers to the introduction of impurities into an extremely pure intrinsic semiconductor for the purpose of modulating its electrical properties. The impurities are dependent upon the type of semiconductor and the properties that it needs to have for its intended purpose.