[1] Elecronegativity is the measure of -
A.
Metallic character
B.
Non-metallic character
C.
Basic Character
D.
None of these
Ans:
Non-metallic character
Explanation :
Electronegativity cannot be directly measured and must be calculated from other atomic or molecular properties. Several methods of calculation have been proposed, and although there may be small differences in the numerical values of the electro negativity, all methods show the same periodic trends between elements.
[2] Which of the following waves cannot be polarized?
A.
Radio
B.
Ultra violet
C.
Infrared
D.
Ultrasonic
Ans:
Ultrasonic
Explanation :
Only transverse waves (such as radio, ultraviolet and infrared waves) can be polarized since their vibrations can potentially occur in all directions perpendicular to the direction of travel. It is therefore possible to confine the vibrations to a single plane.
[3] Which one of the following is a vector quantity?
A.
Momentum
B.
Pressure
C.
Energy
D.
Work
Ans:
Momentum
Explanation :
Angular momentum is the measure of turning motion of a body. Angular momentum is a measure of the linear momentum and the perpendicular distance of its line of action from the axis of rotation. It is a vector quantity. In the case of heat, time and work, they are scalar quantities since they do not have direction.
[4] If the angle of incidence formed on a concave mirror at a point is 30° then the angle of reflection will be:
A.
15°
B.
30°
C.
60°
D.
90°
Ans:
30°
Explanation :
The angle between the incident ray and the normal is known as the angle of incidence. The angle between the reflected ray and the normal is known as the angle of reflection.
[5] Which among the following is not a unit of distance?
A.
Light year
B.
Longsec
C.
Astronomical unit
D.
Parsec
Ans:
Longsec
Explanation :
Longsec is unit of parse, parse is used to allocate distance to astronomical bodies beyond the solar system.
[6] The rotational effect of a force on a body about an axis of rotation is described in terms of the -
A.
Centre of gravity
B.
Centripetal force
C.
Centrifugal force
D.
Moment of force
Ans:
Moment of force
Explanation :
The rotational effect of a force on a body about an axis of rotation is described in terms of the Moment of force.
[7] Radian per second is unit of _.
A.
Momentum
B.
Moment of Inertia
C.
Frequency
D.
Angle Velocity
Ans:
Angle Velocity
Explanation :
The SI unit of angular velocity is radians per second.
[8] Sound of frequency below 20 Hz is called .
A.
audio sounds
B.
infrasonic
C.
ultrasonic
D.
supersonics
Ans:
infrasonic
Explanation :
The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound and nominally includes anything under 20 Hz.
[9] Which among the following is not an inner planet?
A.
Mercury
B.
Saturn
C.
Venus
D.
Earth
Ans:
Saturn
Explanation :
The inner planets (in order of distance from the sun, closest to furthest) are Mercury. Venus, Earth and Mars.
[10] What is the phenomenon which established the transverse nature of light?
A.
Reflection
B.
Interference
C.
Diffraction
D.
Polarisation
Ans:
Polarisation
Explanation :
The phenomena which proves the transverse nature alight is polarization. Since the intensity of polarized light on passing through a tourmaline crystal changes, with the relative orientation of its crystallographic axes with that of the polarizer, therefore light must consist of transverse waves. Transverse waves are waves that are oscillating perpendicularly to the direction of propagation
[11] During combustion of unsaturated compounds a is seen.
A.
clean flame
B.
blue flame
C.
red flame
D.
yellow flame
Ans:
yellow flame
Explanation :
When saturated compounds are burnt in air, they give a clear(blue) flame due to complete combustion. However the burning of unsaturated compounds (alkenes and alkynes) gives a sooty (yellowish) flame due to incomplete combustion.
[12] Which one among the following doesn't have any effect on velocity of sound?
A.
Pressure
B.
Temperature
C.
Humidity
D.
Density
Ans:
Humidity
Explanation :
The speed of sound varies depending on the temperature, pressure, and density of the medium through which the sound waves travel. In most of the cases, it is density which matters. Sound travels faster through denser air (or other material). The density of air is affected by atmospheric pressure, temperature, and altitude.
[13] When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are –
A.
longitudinal
B.
transverse
C.
both longitudinal and transverse
D.
waves are not produced
Ans:
transverse
Explanation :
The waves produced on the surface of water in the pond are an example of transverse waves as particles of the medium do not move along with the wave. Only the disturbance is carried forward. Another example of such waves is the vibrations of a string.
[14] A cyclone is an engineering device that is used to -
A.
transport materials
B.
segregate particles
C.
control switching devices
D.
model fractals
Ans:
segregate particles
Explanation :
When removing particulate matter from liquid, a hydrocyclone issued; while from gas, a gas cyclone is used.
[15] The density of water is 1 g/cc. This is strictly valid at –
A.
0°C
B.
4°C
C.
25°C
D.
100°C
Ans:
4°C
Explanation :
Water never has an absolute density because its density varies with temperature. Water has its maximum density of 1 g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3. Water has the maximum density of 1 g/cm3 only when it is pure water.
[16] Which of the following is one of the commercial products obtained from Gelidium and Gracilaria and are used to grow microbes and in preparations of ice-creams and jellies?
A.
Agar
B.
Chlorella
C.
Spirullina
D.
Gymnosperms
Ans:
Agar
Explanation :
Agar, one of the commercial products obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies.
[17] In an electric motor, the energy transformation is from _.
A.
electrical to chemical
B.
chemical to light
C.
mechanical to electrical
D.
electrical to mechanical
Ans:
electrical to mechanical
Explanation :
An electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this would be the conversion of mechanical energy into electrical energy and is done by an electric generator.
[18] A radioactive substance does not undergo any change (in mass or charge) during –
A.
gamma-emission
B.
oxidation
C.
alpha-emission
D.
beta-emission
Ans:
gamma-emission
Explanation :
Gamma-rays do not carry any charge. These rays do not have any mass and hence can not be considered to be made up of particles.
[19] On a rainy day, small oil films on water show brilliant colors. This is due to -
A.
dispersion
B.
interference
C.
diffraction
D.
polarization
Ans:
interference
Explanation :
The combination of two or more electromagnetic waveforms to form a resultant wave in which the displacement is either reinforced or cancelled.
[20] The waveform of a certain signal can be studied by –
A.
Spectrometer
B.
Cathode ray oscilloscope
C.
p - n junction diode
D.
Sonometer
Ans:
Sonometer
Explanation :
A spectrometer is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. Cathode ray oscilloscope is an electronic display device containing cathode- ray tube (CRT) that generates an electron beam that is used to produce visible patterns or graphs on a phosphorescent screen.
[21] Ultrasonic waves are produced by making use of -
A.
ferro magnetic material
B.
ferri magnetic material
C.
piezo electric material
D.
pyro electrical material
Ans:
piezo electric material
Explanation :
In most applications, ultrasonic waves are generated by a transducer that includes a piezoelectric material (crystal) that converts electrical energy (electric current) to mechanical energy (sound waves).
[22] Least audible sound for most of the human ear is –
A.
10.0 μ bar
B.
0.0002 μ bar
C.
0.005 μ bar
D.
5.0 μ bar
Ans:
0.0002 μ bar
Explanation :
Least audible sound for most of the human ear is 2 x 10-5 pascal. The generally accepted standard range of audible frequencies is 20 to 20,000 Hz.
[23] Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known as:
A.
Mixing ratio
B.
Relative humidity
C.
Absolute humidity
D.
Specific humidity
Ans:
Absolute humidity
Explanation :
The relative humidity of air at a given temperature is the ratio of mass of water vapour actually present in a certain volume of air to the mass of water vapour required to saturate the same volume of air at the same temperature, multiplied by 100.
[24] Which of the following is a conductor of electricity?
A.
Rubber
B.
Pure water
C.
Salt water
D.
Benzene
Ans:
Salt water
Explanation :
Pure water is actually an extremely poor conductor, but saturated salt water is a good conductor. The saltier the water, the better the conductance. The reason it conducts electricity is because the NaCl (sodium chloride) breaks apart into a positively charged Na+ and a negatively charged Chlorine CF. When current is applied, it is easily conducted by the highly charged ions.
[25] The opening and closing of the stomatal pores is a function of the -
A.
Guard cells
B.
Chloroplast
C.
Xylem
D.
Phloem
Ans:
Guard cells
Explanation :
The opening and closing of the pores is a function of the guard cells. They swell when water flows into them, causing the stomatal pore to open and likewise, the pore closes if the guard cells shrink.
Explanation :
Electronegativity cannot be directly measured and must be calculated from other atomic or molecular properties. Several methods of calculation have been proposed, and although there may be small differences in the numerical values of the electro negativity, all methods show the same periodic trends between elements.
[2] Which of the following waves cannot be polarized?
A.
Radio
B.
Ultra violet
C.
Infrared
D.
Ultrasonic
Ans:
Ultrasonic
Explanation :
Only transverse waves (such as radio, ultraviolet and infrared waves) can be polarized since their vibrations can potentially occur in all directions perpendicular to the direction of travel. It is therefore possible to confine the vibrations to a single plane.
[3] Which one of the following is a vector quantity?
A.
Momentum
B.
Pressure
C.
Energy
D.
Work
Ans:
Momentum
Explanation :
Angular momentum is the measure of turning motion of a body. Angular momentum is a measure of the linear momentum and the perpendicular distance of its line of action from the axis of rotation. It is a vector quantity. In the case of heat, time and work, they are scalar quantities since they do not have direction.
[4] If the angle of incidence formed on a concave mirror at a point is 30° then the angle of reflection will be:
A.
15°
B.
30°
C.
60°
D.
90°
Ans:
30°
Explanation :
The angle between the incident ray and the normal is known as the angle of incidence. The angle between the reflected ray and the normal is known as the angle of reflection.
[5] Which among the following is not a unit of distance?
A.
Light year
B.
Longsec
C.
Astronomical unit
D.
Parsec
Ans:
Longsec
Explanation :
Longsec is unit of parse, parse is used to allocate distance to astronomical bodies beyond the solar system.
[6] The rotational effect of a force on a body about an axis of rotation is described in terms of the -
A.
Centre of gravity
B.
Centripetal force
C.
Centrifugal force
D.
Moment of force
Ans:
Moment of force
Explanation :
The rotational effect of a force on a body about an axis of rotation is described in terms of the Moment of force.
[7] Radian per second is unit of _.
A.
Momentum
B.
Moment of Inertia
C.
Frequency
D.
Angle Velocity
Ans:
Angle Velocity
Explanation :
The SI unit of angular velocity is radians per second.
[8] Sound of frequency below 20 Hz is called .
A.
audio sounds
B.
infrasonic
C.
ultrasonic
D.
supersonics
Ans:
infrasonic
Explanation :
The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound and nominally includes anything under 20 Hz.
[9] Which among the following is not an inner planet?
A.
Mercury
B.
Saturn
C.
Venus
D.
Earth
Ans:
Saturn
Explanation :
The inner planets (in order of distance from the sun, closest to furthest) are Mercury. Venus, Earth and Mars.
[10] What is the phenomenon which established the transverse nature of light?
A.
Reflection
B.
Interference
C.
Diffraction
D.
Polarisation
Ans:
Polarisation
Explanation :
The phenomena which proves the transverse nature alight is polarization. Since the intensity of polarized light on passing through a tourmaline crystal changes, with the relative orientation of its crystallographic axes with that of the polarizer, therefore light must consist of transverse waves. Transverse waves are waves that are oscillating perpendicularly to the direction of propagation
[11] During combustion of unsaturated compounds a is seen.
A.
clean flame
B.
blue flame
C.
red flame
D.
yellow flame
Ans:
yellow flame
Explanation :
When saturated compounds are burnt in air, they give a clear(blue) flame due to complete combustion. However the burning of unsaturated compounds (alkenes and alkynes) gives a sooty (yellowish) flame due to incomplete combustion.
[12] Which one among the following doesn't have any effect on velocity of sound?
A.
Pressure
B.
Temperature
C.
Humidity
D.
Density
Ans:
Humidity
Explanation :
The speed of sound varies depending on the temperature, pressure, and density of the medium through which the sound waves travel. In most of the cases, it is density which matters. Sound travels faster through denser air (or other material). The density of air is affected by atmospheric pressure, temperature, and altitude.
[13] When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are –
A.
longitudinal
B.
transverse
C.
both longitudinal and transverse
D.
waves are not produced
Ans:
transverse
Explanation :
The waves produced on the surface of water in the pond are an example of transverse waves as particles of the medium do not move along with the wave. Only the disturbance is carried forward. Another example of such waves is the vibrations of a string.
[14] A cyclone is an engineering device that is used to -
A.
transport materials
B.
segregate particles
C.
control switching devices
D.
model fractals
Ans:
segregate particles
Explanation :
When removing particulate matter from liquid, a hydrocyclone issued; while from gas, a gas cyclone is used.
[15] The density of water is 1 g/cc. This is strictly valid at –
A.
0°C
B.
4°C
C.
25°C
D.
100°C
Ans:
4°C
Explanation :
Water never has an absolute density because its density varies with temperature. Water has its maximum density of 1 g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3. Water has the maximum density of 1 g/cm3 only when it is pure water.
[16] Which of the following is one of the commercial products obtained from Gelidium and Gracilaria and are used to grow microbes and in preparations of ice-creams and jellies?
A.
Agar
B.
Chlorella
C.
Spirullina
D.
Gymnosperms
Ans:
Agar
Explanation :
Agar, one of the commercial products obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies.
[17] In an electric motor, the energy transformation is from _.
A.
electrical to chemical
B.
chemical to light
C.
mechanical to electrical
D.
electrical to mechanical
Ans:
electrical to mechanical
Explanation :
An electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this would be the conversion of mechanical energy into electrical energy and is done by an electric generator.
[18] A radioactive substance does not undergo any change (in mass or charge) during –
A.
gamma-emission
B.
oxidation
C.
alpha-emission
D.
beta-emission
Ans:
gamma-emission
Explanation :
Gamma-rays do not carry any charge. These rays do not have any mass and hence can not be considered to be made up of particles.
[19] On a rainy day, small oil films on water show brilliant colors. This is due to -
A.
dispersion
B.
interference
C.
diffraction
D.
polarization
Ans:
interference
Explanation :
The combination of two or more electromagnetic waveforms to form a resultant wave in which the displacement is either reinforced or cancelled.
[20] The waveform of a certain signal can be studied by –
A.
Spectrometer
B.
Cathode ray oscilloscope
C.
p - n junction diode
D.
Sonometer
Ans:
Sonometer
Explanation :
A spectrometer is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. Cathode ray oscilloscope is an electronic display device containing cathode- ray tube (CRT) that generates an electron beam that is used to produce visible patterns or graphs on a phosphorescent screen.
[21] Ultrasonic waves are produced by making use of -
A.
ferro magnetic material
B.
ferri magnetic material
C.
piezo electric material
D.
pyro electrical material
Ans:
piezo electric material
Explanation :
In most applications, ultrasonic waves are generated by a transducer that includes a piezoelectric material (crystal) that converts electrical energy (electric current) to mechanical energy (sound waves).
[22] Least audible sound for most of the human ear is –
A.
10.0 μ bar
B.
0.0002 μ bar
C.
0.005 μ bar
D.
5.0 μ bar
Ans:
0.0002 μ bar
Explanation :
Least audible sound for most of the human ear is 2 x 10-5 pascal. The generally accepted standard range of audible frequencies is 20 to 20,000 Hz.
[23] Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known as:
A.
Mixing ratio
B.
Relative humidity
C.
Absolute humidity
D.
Specific humidity
Ans:
Absolute humidity
Explanation :
The relative humidity of air at a given temperature is the ratio of mass of water vapour actually present in a certain volume of air to the mass of water vapour required to saturate the same volume of air at the same temperature, multiplied by 100.
[24] Which of the following is a conductor of electricity?
A.
Rubber
B.
Pure water
C.
Salt water
D.
Benzene
Ans:
Salt water
Explanation :
Pure water is actually an extremely poor conductor, but saturated salt water is a good conductor. The saltier the water, the better the conductance. The reason it conducts electricity is because the NaCl (sodium chloride) breaks apart into a positively charged Na+ and a negatively charged Chlorine CF. When current is applied, it is easily conducted by the highly charged ions.
[25] The opening and closing of the stomatal pores is a function of the -
A.
Guard cells
B.
Chloroplast
C.
Xylem
D.
Phloem
Ans:
Guard cells
Explanation :
The opening and closing of the pores is a function of the guard cells. They swell when water flows into them, causing the stomatal pore to open and likewise, the pore closes if the guard cells shrink.
Explanation :
Angular momentum is the measure of turning motion of a body. Angular momentum is a measure of the linear momentum and the perpendicular distance of its line of action from the axis of rotation. It is a vector quantity. In the case of heat, time and work, they are scalar quantities since they do not have direction.
[4] If the angle of incidence formed on a concave mirror at a point is 30° then the angle of reflection will be:
A.
15°
B.
30°
C.
60°
D.
90°
Ans:
30°
Explanation :
The angle between the incident ray and the normal is known as the angle of incidence. The angle between the reflected ray and the normal is known as the angle of reflection.
[5] Which among the following is not a unit of distance?
A.
Light year
B.
Longsec
C.
Astronomical unit
D.
Parsec
Ans:
Longsec
Explanation :
Longsec is unit of parse, parse is used to allocate distance to astronomical bodies beyond the solar system.
[6] The rotational effect of a force on a body about an axis of rotation is described in terms of the -
A.
Centre of gravity
B.
Centripetal force
C.
Centrifugal force
D.
Moment of force
Ans:
Moment of force
Explanation :
The rotational effect of a force on a body about an axis of rotation is described in terms of the Moment of force.
[7] Radian per second is unit of _.
A.
Momentum
B.
Moment of Inertia
C.
Frequency
D.
Angle Velocity
Ans:
Angle Velocity
Explanation :
The SI unit of angular velocity is radians per second.
[8] Sound of frequency below 20 Hz is called .
A.
audio sounds
B.
infrasonic
C.
ultrasonic
D.
supersonics
Ans:
infrasonic
Explanation :
The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound and nominally includes anything under 20 Hz.
[9] Which among the following is not an inner planet?
A.
Mercury
B.
Saturn
C.
Venus
D.
Earth
Ans:
Saturn
Explanation :
The inner planets (in order of distance from the sun, closest to furthest) are Mercury. Venus, Earth and Mars.
[10] What is the phenomenon which established the transverse nature of light?
A.
Reflection
B.
Interference
C.
Diffraction
D.
Polarisation
Ans:
Polarisation
Explanation :
The phenomena which proves the transverse nature alight is polarization. Since the intensity of polarized light on passing through a tourmaline crystal changes, with the relative orientation of its crystallographic axes with that of the polarizer, therefore light must consist of transverse waves. Transverse waves are waves that are oscillating perpendicularly to the direction of propagation
[11] During combustion of unsaturated compounds a is seen.
A.
clean flame
B.
blue flame
C.
red flame
D.
yellow flame
Ans:
yellow flame
Explanation :
When saturated compounds are burnt in air, they give a clear(blue) flame due to complete combustion. However the burning of unsaturated compounds (alkenes and alkynes) gives a sooty (yellowish) flame due to incomplete combustion.
[12] Which one among the following doesn't have any effect on velocity of sound?
A.
Pressure
B.
Temperature
C.
Humidity
D.
Density
Ans:
Humidity
Explanation :
The speed of sound varies depending on the temperature, pressure, and density of the medium through which the sound waves travel. In most of the cases, it is density which matters. Sound travels faster through denser air (or other material). The density of air is affected by atmospheric pressure, temperature, and altitude.
[13] When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are –
A.
longitudinal
B.
transverse
C.
both longitudinal and transverse
D.
waves are not produced
Ans:
transverse
Explanation :
The waves produced on the surface of water in the pond are an example of transverse waves as particles of the medium do not move along with the wave. Only the disturbance is carried forward. Another example of such waves is the vibrations of a string.
[14] A cyclone is an engineering device that is used to -
A.
transport materials
B.
segregate particles
C.
control switching devices
D.
model fractals
Ans:
segregate particles
Explanation :
When removing particulate matter from liquid, a hydrocyclone issued; while from gas, a gas cyclone is used.
[15] The density of water is 1 g/cc. This is strictly valid at –
A.
0°C
B.
4°C
C.
25°C
D.
100°C
Ans:
4°C
Explanation :
Water never has an absolute density because its density varies with temperature. Water has its maximum density of 1 g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3. Water has the maximum density of 1 g/cm3 only when it is pure water.
[16] Which of the following is one of the commercial products obtained from Gelidium and Gracilaria and are used to grow microbes and in preparations of ice-creams and jellies?
A.
Agar
B.
Chlorella
C.
Spirullina
D.
Gymnosperms
Ans:
Agar
Explanation :
Agar, one of the commercial products obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies.
[17] In an electric motor, the energy transformation is from _.
A.
electrical to chemical
B.
chemical to light
C.
mechanical to electrical
D.
electrical to mechanical
Ans:
electrical to mechanical
Explanation :
An electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this would be the conversion of mechanical energy into electrical energy and is done by an electric generator.
[18] A radioactive substance does not undergo any change (in mass or charge) during –
A.
gamma-emission
B.
oxidation
C.
alpha-emission
D.
beta-emission
Ans:
gamma-emission
Explanation :
Gamma-rays do not carry any charge. These rays do not have any mass and hence can not be considered to be made up of particles.
[19] On a rainy day, small oil films on water show brilliant colors. This is due to -
A.
dispersion
B.
interference
C.
diffraction
D.
polarization
Ans:
interference
Explanation :
The combination of two or more electromagnetic waveforms to form a resultant wave in which the displacement is either reinforced or cancelled.
[20] The waveform of a certain signal can be studied by –
A.
Spectrometer
B.
Cathode ray oscilloscope
C.
p - n junction diode
D.
Sonometer
Ans:
Sonometer
Explanation :
A spectrometer is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. Cathode ray oscilloscope is an electronic display device containing cathode- ray tube (CRT) that generates an electron beam that is used to produce visible patterns or graphs on a phosphorescent screen.
[21] Ultrasonic waves are produced by making use of -
A.
ferro magnetic material
B.
ferri magnetic material
C.
piezo electric material
D.
pyro electrical material
Ans:
piezo electric material
Explanation :
In most applications, ultrasonic waves are generated by a transducer that includes a piezoelectric material (crystal) that converts electrical energy (electric current) to mechanical energy (sound waves).
[22] Least audible sound for most of the human ear is –
A.
10.0 μ bar
B.
0.0002 μ bar
C.
0.005 μ bar
D.
5.0 μ bar
Ans:
0.0002 μ bar
Explanation :
Least audible sound for most of the human ear is 2 x 10-5 pascal. The generally accepted standard range of audible frequencies is 20 to 20,000 Hz.
[23] Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known as:
A.
Mixing ratio
B.
Relative humidity
C.
Absolute humidity
D.
Specific humidity
Ans:
Absolute humidity
Explanation :
The relative humidity of air at a given temperature is the ratio of mass of water vapour actually present in a certain volume of air to the mass of water vapour required to saturate the same volume of air at the same temperature, multiplied by 100.
[24] Which of the following is a conductor of electricity?
A.
Rubber
B.
Pure water
C.
Salt water
D.
Benzene
Ans:
Salt water
Explanation :
Pure water is actually an extremely poor conductor, but saturated salt water is a good conductor. The saltier the water, the better the conductance. The reason it conducts electricity is because the NaCl (sodium chloride) breaks apart into a positively charged Na+ and a negatively charged Chlorine CF. When current is applied, it is easily conducted by the highly charged ions.
[25] The opening and closing of the stomatal pores is a function of the -
A.
Guard cells
B.
Chloroplast
C.
Xylem
D.
Phloem
Ans:
Guard cells
Explanation :
The opening and closing of the pores is a function of the guard cells. They swell when water flows into them, causing the stomatal pore to open and likewise, the pore closes if the guard cells shrink.
Explanation :
Longsec is unit of parse, parse is used to allocate distance to astronomical bodies beyond the solar system.
[6] The rotational effect of a force on a body about an axis of rotation is described in terms of the -
A.
Centre of gravity
B.
Centripetal force
C.
Centrifugal force
D.
Moment of force
Ans:
Moment of force
Explanation :
The rotational effect of a force on a body about an axis of rotation is described in terms of the Moment of force.
[7] Radian per second is unit of _.
A.
Momentum
B.
Moment of Inertia
C.
Frequency
D.
Angle Velocity
Ans:
Angle Velocity
Explanation :
The SI unit of angular velocity is radians per second.
[8] Sound of frequency below 20 Hz is called .
A.
audio sounds
B.
infrasonic
C.
ultrasonic
D.
supersonics
Ans:
infrasonic
Explanation :
The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound and nominally includes anything under 20 Hz.
[9] Which among the following is not an inner planet?
A.
Mercury
B.
Saturn
C.
Venus
D.
Earth
Ans:
Saturn
Explanation :
The inner planets (in order of distance from the sun, closest to furthest) are Mercury. Venus, Earth and Mars.
[10] What is the phenomenon which established the transverse nature of light?
A.
Reflection
B.
Interference
C.
Diffraction
D.
Polarisation
Ans:
Polarisation
Explanation :
The phenomena which proves the transverse nature alight is polarization. Since the intensity of polarized light on passing through a tourmaline crystal changes, with the relative orientation of its crystallographic axes with that of the polarizer, therefore light must consist of transverse waves. Transverse waves are waves that are oscillating perpendicularly to the direction of propagation
[11] During combustion of unsaturated compounds a is seen.
A.
clean flame
B.
blue flame
C.
red flame
D.
yellow flame
Ans:
yellow flame
Explanation :
When saturated compounds are burnt in air, they give a clear(blue) flame due to complete combustion. However the burning of unsaturated compounds (alkenes and alkynes) gives a sooty (yellowish) flame due to incomplete combustion.
[12] Which one among the following doesn't have any effect on velocity of sound?
A.
Pressure
B.
Temperature
C.
Humidity
D.
Density
Ans:
Humidity
Explanation :
The speed of sound varies depending on the temperature, pressure, and density of the medium through which the sound waves travel. In most of the cases, it is density which matters. Sound travels faster through denser air (or other material). The density of air is affected by atmospheric pressure, temperature, and altitude.
[13] When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are –
A.
longitudinal
B.
transverse
C.
both longitudinal and transverse
D.
waves are not produced
Ans:
transverse
Explanation :
The waves produced on the surface of water in the pond are an example of transverse waves as particles of the medium do not move along with the wave. Only the disturbance is carried forward. Another example of such waves is the vibrations of a string.
[14] A cyclone is an engineering device that is used to -
A.
transport materials
B.
segregate particles
C.
control switching devices
D.
model fractals
Ans:
segregate particles
Explanation :
When removing particulate matter from liquid, a hydrocyclone issued; while from gas, a gas cyclone is used.
[15] The density of water is 1 g/cc. This is strictly valid at –
A.
0°C
B.
4°C
C.
25°C
D.
100°C
Ans:
4°C
Explanation :
Water never has an absolute density because its density varies with temperature. Water has its maximum density of 1 g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3. Water has the maximum density of 1 g/cm3 only when it is pure water.
[16] Which of the following is one of the commercial products obtained from Gelidium and Gracilaria and are used to grow microbes and in preparations of ice-creams and jellies?
A.
Agar
B.
Chlorella
C.
Spirullina
D.
Gymnosperms
Ans:
Agar
Explanation :
Agar, one of the commercial products obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies.
[17] In an electric motor, the energy transformation is from _.
A.
electrical to chemical
B.
chemical to light
C.
mechanical to electrical
D.
electrical to mechanical
Ans:
electrical to mechanical
Explanation :
An electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this would be the conversion of mechanical energy into electrical energy and is done by an electric generator.
[18] A radioactive substance does not undergo any change (in mass or charge) during –
A.
gamma-emission
B.
oxidation
C.
alpha-emission
D.
beta-emission
Ans:
gamma-emission
Explanation :
Gamma-rays do not carry any charge. These rays do not have any mass and hence can not be considered to be made up of particles.
[19] On a rainy day, small oil films on water show brilliant colors. This is due to -
A.
dispersion
B.
interference
C.
diffraction
D.
polarization
Ans:
interference
Explanation :
The combination of two or more electromagnetic waveforms to form a resultant wave in which the displacement is either reinforced or cancelled.
[20] The waveform of a certain signal can be studied by –
A.
Spectrometer
B.
Cathode ray oscilloscope
C.
p - n junction diode
D.
Sonometer
Ans:
Sonometer
Explanation :
A spectrometer is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. Cathode ray oscilloscope is an electronic display device containing cathode- ray tube (CRT) that generates an electron beam that is used to produce visible patterns or graphs on a phosphorescent screen.
[21] Ultrasonic waves are produced by making use of -
A.
ferro magnetic material
B.
ferri magnetic material
C.
piezo electric material
D.
pyro electrical material
Ans:
piezo electric material
Explanation :
In most applications, ultrasonic waves are generated by a transducer that includes a piezoelectric material (crystal) that converts electrical energy (electric current) to mechanical energy (sound waves).
[22] Least audible sound for most of the human ear is –
A.
10.0 μ bar
B.
0.0002 μ bar
C.
0.005 μ bar
D.
5.0 μ bar
Ans:
0.0002 μ bar
Explanation :
Least audible sound for most of the human ear is 2 x 10-5 pascal. The generally accepted standard range of audible frequencies is 20 to 20,000 Hz.
[23] Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known as:
A.
Mixing ratio
B.
Relative humidity
C.
Absolute humidity
D.
Specific humidity
Ans:
Absolute humidity
Explanation :
The relative humidity of air at a given temperature is the ratio of mass of water vapour actually present in a certain volume of air to the mass of water vapour required to saturate the same volume of air at the same temperature, multiplied by 100.
[24] Which of the following is a conductor of electricity?
A.
Rubber
B.
Pure water
C.
Salt water
D.
Benzene
Ans:
Salt water
Explanation :
Pure water is actually an extremely poor conductor, but saturated salt water is a good conductor. The saltier the water, the better the conductance. The reason it conducts electricity is because the NaCl (sodium chloride) breaks apart into a positively charged Na+ and a negatively charged Chlorine CF. When current is applied, it is easily conducted by the highly charged ions.
[25] The opening and closing of the stomatal pores is a function of the -
A.
Guard cells
B.
Chloroplast
C.
Xylem
D.
Phloem
Ans:
Guard cells
Explanation :
The opening and closing of the pores is a function of the guard cells. They swell when water flows into them, causing the stomatal pore to open and likewise, the pore closes if the guard cells shrink.
Explanation :
The SI unit of angular velocity is radians per second.
[8] Sound of frequency below 20 Hz is called .
A.
audio sounds
B.
infrasonic
C.
ultrasonic
D.
supersonics
Ans:
infrasonic
Explanation :
The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound and nominally includes anything under 20 Hz.
[9] Which among the following is not an inner planet?
A.
Mercury
B.
Saturn
C.
Venus
D.
Earth
Ans:
Saturn
Explanation :
The inner planets (in order of distance from the sun, closest to furthest) are Mercury. Venus, Earth and Mars.
[10] What is the phenomenon which established the transverse nature of light?
A.
Reflection
B.
Interference
C.
Diffraction
D.
Polarisation
Ans:
Polarisation
Explanation :
The phenomena which proves the transverse nature alight is polarization. Since the intensity of polarized light on passing through a tourmaline crystal changes, with the relative orientation of its crystallographic axes with that of the polarizer, therefore light must consist of transverse waves. Transverse waves are waves that are oscillating perpendicularly to the direction of propagation
[11] During combustion of unsaturated compounds a is seen.
A.
clean flame
B.
blue flame
C.
red flame
D.
yellow flame
Ans:
yellow flame
Explanation :
When saturated compounds are burnt in air, they give a clear(blue) flame due to complete combustion. However the burning of unsaturated compounds (alkenes and alkynes) gives a sooty (yellowish) flame due to incomplete combustion.
[12] Which one among the following doesn't have any effect on velocity of sound?
A.
Pressure
B.
Temperature
C.
Humidity
D.
Density
Ans:
Humidity
Explanation :
The speed of sound varies depending on the temperature, pressure, and density of the medium through which the sound waves travel. In most of the cases, it is density which matters. Sound travels faster through denser air (or other material). The density of air is affected by atmospheric pressure, temperature, and altitude.
[13] When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are –
A.
longitudinal
B.
transverse
C.
both longitudinal and transverse
D.
waves are not produced
Ans:
transverse
Explanation :
The waves produced on the surface of water in the pond are an example of transverse waves as particles of the medium do not move along with the wave. Only the disturbance is carried forward. Another example of such waves is the vibrations of a string.
[14] A cyclone is an engineering device that is used to -
A.
transport materials
B.
segregate particles
C.
control switching devices
D.
model fractals
Ans:
segregate particles
Explanation :
When removing particulate matter from liquid, a hydrocyclone issued; while from gas, a gas cyclone is used.
[15] The density of water is 1 g/cc. This is strictly valid at –
A.
0°C
B.
4°C
C.
25°C
D.
100°C
Ans:
4°C
Explanation :
Water never has an absolute density because its density varies with temperature. Water has its maximum density of 1 g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3. Water has the maximum density of 1 g/cm3 only when it is pure water.
[16] Which of the following is one of the commercial products obtained from Gelidium and Gracilaria and are used to grow microbes and in preparations of ice-creams and jellies?
A.
Agar
B.
Chlorella
C.
Spirullina
D.
Gymnosperms
Ans:
Agar
Explanation :
Agar, one of the commercial products obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies.
[17] In an electric motor, the energy transformation is from _.
A.
electrical to chemical
B.
chemical to light
C.
mechanical to electrical
D.
electrical to mechanical
Ans:
electrical to mechanical
Explanation :
An electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this would be the conversion of mechanical energy into electrical energy and is done by an electric generator.
[18] A radioactive substance does not undergo any change (in mass or charge) during –
A.
gamma-emission
B.
oxidation
C.
alpha-emission
D.
beta-emission
Ans:
gamma-emission
Explanation :
Gamma-rays do not carry any charge. These rays do not have any mass and hence can not be considered to be made up of particles.
[19] On a rainy day, small oil films on water show brilliant colors. This is due to -
A.
dispersion
B.
interference
C.
diffraction
D.
polarization
Ans:
interference
Explanation :
The combination of two or more electromagnetic waveforms to form a resultant wave in which the displacement is either reinforced or cancelled.
[20] The waveform of a certain signal can be studied by –
A.
Spectrometer
B.
Cathode ray oscilloscope
C.
p - n junction diode
D.
Sonometer
Ans:
Sonometer
Explanation :
A spectrometer is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. Cathode ray oscilloscope is an electronic display device containing cathode- ray tube (CRT) that generates an electron beam that is used to produce visible patterns or graphs on a phosphorescent screen.
[21] Ultrasonic waves are produced by making use of -
A.
ferro magnetic material
B.
ferri magnetic material
C.
piezo electric material
D.
pyro electrical material
Ans:
piezo electric material
Explanation :
In most applications, ultrasonic waves are generated by a transducer that includes a piezoelectric material (crystal) that converts electrical energy (electric current) to mechanical energy (sound waves).
[22] Least audible sound for most of the human ear is –
A.
10.0 μ bar
B.
0.0002 μ bar
C.
0.005 μ bar
D.
5.0 μ bar
Ans:
0.0002 μ bar
Explanation :
Least audible sound for most of the human ear is 2 x 10-5 pascal. The generally accepted standard range of audible frequencies is 20 to 20,000 Hz.
[23] Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known as:
A.
Mixing ratio
B.
Relative humidity
C.
Absolute humidity
D.
Specific humidity
Ans:
Absolute humidity
Explanation :
The relative humidity of air at a given temperature is the ratio of mass of water vapour actually present in a certain volume of air to the mass of water vapour required to saturate the same volume of air at the same temperature, multiplied by 100.
[24] Which of the following is a conductor of electricity?
A.
Rubber
B.
Pure water
C.
Salt water
D.
Benzene
Ans:
Salt water
Explanation :
Pure water is actually an extremely poor conductor, but saturated salt water is a good conductor. The saltier the water, the better the conductance. The reason it conducts electricity is because the NaCl (sodium chloride) breaks apart into a positively charged Na+ and a negatively charged Chlorine CF. When current is applied, it is easily conducted by the highly charged ions.
[25] The opening and closing of the stomatal pores is a function of the -
A.
Guard cells
B.
Chloroplast
C.
Xylem
D.
Phloem
Ans:
Guard cells
Explanation :
The opening and closing of the pores is a function of the guard cells. They swell when water flows into them, causing the stomatal pore to open and likewise, the pore closes if the guard cells shrink.
Explanation :
The inner planets (in order of distance from the sun, closest to furthest) are Mercury. Venus, Earth and Mars.
[10] What is the phenomenon which established the transverse nature of light?
A.
Reflection
B.
Interference
C.
Diffraction
D.
Polarisation
Ans:
Polarisation
Explanation :
The phenomena which proves the transverse nature alight is polarization. Since the intensity of polarized light on passing through a tourmaline crystal changes, with the relative orientation of its crystallographic axes with that of the polarizer, therefore light must consist of transverse waves. Transverse waves are waves that are oscillating perpendicularly to the direction of propagation
[11] During combustion of unsaturated compounds a is seen.
A.
clean flame
B.
blue flame
C.
red flame
D.
yellow flame
Ans:
yellow flame
Explanation :
When saturated compounds are burnt in air, they give a clear(blue) flame due to complete combustion. However the burning of unsaturated compounds (alkenes and alkynes) gives a sooty (yellowish) flame due to incomplete combustion.
[12] Which one among the following doesn't have any effect on velocity of sound?
A.
Pressure
B.
Temperature
C.
Humidity
D.
Density
Ans:
Humidity
Explanation :
The speed of sound varies depending on the temperature, pressure, and density of the medium through which the sound waves travel. In most of the cases, it is density which matters. Sound travels faster through denser air (or other material). The density of air is affected by atmospheric pressure, temperature, and altitude.
[13] When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are –
A.
longitudinal
B.
transverse
C.
both longitudinal and transverse
D.
waves are not produced
Ans:
transverse
Explanation :
The waves produced on the surface of water in the pond are an example of transverse waves as particles of the medium do not move along with the wave. Only the disturbance is carried forward. Another example of such waves is the vibrations of a string.
[14] A cyclone is an engineering device that is used to -
A.
transport materials
B.
segregate particles
C.
control switching devices
D.
model fractals
Ans:
segregate particles
Explanation :
When removing particulate matter from liquid, a hydrocyclone issued; while from gas, a gas cyclone is used.
[15] The density of water is 1 g/cc. This is strictly valid at –
A.
0°C
B.
4°C
C.
25°C
D.
100°C
Ans:
4°C
Explanation :
Water never has an absolute density because its density varies with temperature. Water has its maximum density of 1 g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3. Water has the maximum density of 1 g/cm3 only when it is pure water.
[16] Which of the following is one of the commercial products obtained from Gelidium and Gracilaria and are used to grow microbes and in preparations of ice-creams and jellies?
A.
Agar
B.
Chlorella
C.
Spirullina
D.
Gymnosperms
Ans:
Agar
Explanation :
Agar, one of the commercial products obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies.
[17] In an electric motor, the energy transformation is from _.
A.
electrical to chemical
B.
chemical to light
C.
mechanical to electrical
D.
electrical to mechanical
Ans:
electrical to mechanical
Explanation :
An electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this would be the conversion of mechanical energy into electrical energy and is done by an electric generator.
[18] A radioactive substance does not undergo any change (in mass or charge) during –
A.
gamma-emission
B.
oxidation
C.
alpha-emission
D.
beta-emission
Ans:
gamma-emission
Explanation :
Gamma-rays do not carry any charge. These rays do not have any mass and hence can not be considered to be made up of particles.
[19] On a rainy day, small oil films on water show brilliant colors. This is due to -
A.
dispersion
B.
interference
C.
diffraction
D.
polarization
Ans:
interference
Explanation :
The combination of two or more electromagnetic waveforms to form a resultant wave in which the displacement is either reinforced or cancelled.
[20] The waveform of a certain signal can be studied by –
A.
Spectrometer
B.
Cathode ray oscilloscope
C.
p - n junction diode
D.
Sonometer
Ans:
Sonometer
Explanation :
A spectrometer is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. Cathode ray oscilloscope is an electronic display device containing cathode- ray tube (CRT) that generates an electron beam that is used to produce visible patterns or graphs on a phosphorescent screen.
[21] Ultrasonic waves are produced by making use of -
A.
ferro magnetic material
B.
ferri magnetic material
C.
piezo electric material
D.
pyro electrical material
Ans:
piezo electric material
Explanation :
In most applications, ultrasonic waves are generated by a transducer that includes a piezoelectric material (crystal) that converts electrical energy (electric current) to mechanical energy (sound waves).
[22] Least audible sound for most of the human ear is –
A.
10.0 μ bar
B.
0.0002 μ bar
C.
0.005 μ bar
D.
5.0 μ bar
Ans:
0.0002 μ bar
Explanation :
Least audible sound for most of the human ear is 2 x 10-5 pascal. The generally accepted standard range of audible frequencies is 20 to 20,000 Hz.
[23] Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known as:
A.
Mixing ratio
B.
Relative humidity
C.
Absolute humidity
D.
Specific humidity
Ans:
Absolute humidity
Explanation :
The relative humidity of air at a given temperature is the ratio of mass of water vapour actually present in a certain volume of air to the mass of water vapour required to saturate the same volume of air at the same temperature, multiplied by 100.
[24] Which of the following is a conductor of electricity?
A.
Rubber
B.
Pure water
C.
Salt water
D.
Benzene
Ans:
Salt water
Explanation :
Pure water is actually an extremely poor conductor, but saturated salt water is a good conductor. The saltier the water, the better the conductance. The reason it conducts electricity is because the NaCl (sodium chloride) breaks apart into a positively charged Na+ and a negatively charged Chlorine CF. When current is applied, it is easily conducted by the highly charged ions.
[25] The opening and closing of the stomatal pores is a function of the -
A.
Guard cells
B.
Chloroplast
C.
Xylem
D.
Phloem
Ans:
Guard cells
Explanation :
The opening and closing of the pores is a function of the guard cells. They swell when water flows into them, causing the stomatal pore to open and likewise, the pore closes if the guard cells shrink.
Explanation :
When saturated compounds are burnt in air, they give a clear(blue) flame due to complete combustion. However the burning of unsaturated compounds (alkenes and alkynes) gives a sooty (yellowish) flame due to incomplete combustion.
[12] Which one among the following doesn't have any effect on velocity of sound?
A.
Pressure
B.
Temperature
C.
Humidity
D.
Density
Ans:
Humidity
Explanation :
The speed of sound varies depending on the temperature, pressure, and density of the medium through which the sound waves travel. In most of the cases, it is density which matters. Sound travels faster through denser air (or other material). The density of air is affected by atmospheric pressure, temperature, and altitude.
[13] When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are –
A.
longitudinal
B.
transverse
C.
both longitudinal and transverse
D.
waves are not produced
Ans:
transverse
Explanation :
The waves produced on the surface of water in the pond are an example of transverse waves as particles of the medium do not move along with the wave. Only the disturbance is carried forward. Another example of such waves is the vibrations of a string.
[14] A cyclone is an engineering device that is used to -
A.
transport materials
B.
segregate particles
C.
control switching devices
D.
model fractals
Ans:
segregate particles
Explanation :
When removing particulate matter from liquid, a hydrocyclone issued; while from gas, a gas cyclone is used.
[15] The density of water is 1 g/cc. This is strictly valid at –
A.
0°C
B.
4°C
C.
25°C
D.
100°C
Ans:
4°C
Explanation :
Water never has an absolute density because its density varies with temperature. Water has its maximum density of 1 g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3. Water has the maximum density of 1 g/cm3 only when it is pure water.
[16] Which of the following is one of the commercial products obtained from Gelidium and Gracilaria and are used to grow microbes and in preparations of ice-creams and jellies?
A.
Agar
B.
Chlorella
C.
Spirullina
D.
Gymnosperms
Ans:
Agar
Explanation :
Agar, one of the commercial products obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies.
[17] In an electric motor, the energy transformation is from _.
A.
electrical to chemical
B.
chemical to light
C.
mechanical to electrical
D.
electrical to mechanical
Ans:
electrical to mechanical
Explanation :
An electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this would be the conversion of mechanical energy into electrical energy and is done by an electric generator.
[18] A radioactive substance does not undergo any change (in mass or charge) during –
A.
gamma-emission
B.
oxidation
C.
alpha-emission
D.
beta-emission
Ans:
gamma-emission
Explanation :
Gamma-rays do not carry any charge. These rays do not have any mass and hence can not be considered to be made up of particles.
[19] On a rainy day, small oil films on water show brilliant colors. This is due to -
A.
dispersion
B.
interference
C.
diffraction
D.
polarization
Ans:
interference
Explanation :
The combination of two or more electromagnetic waveforms to form a resultant wave in which the displacement is either reinforced or cancelled.
[20] The waveform of a certain signal can be studied by –
A.
Spectrometer
B.
Cathode ray oscilloscope
C.
p - n junction diode
D.
Sonometer
Ans:
Sonometer
Explanation :
A spectrometer is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. Cathode ray oscilloscope is an electronic display device containing cathode- ray tube (CRT) that generates an electron beam that is used to produce visible patterns or graphs on a phosphorescent screen.
[21] Ultrasonic waves are produced by making use of -
A.
ferro magnetic material
B.
ferri magnetic material
C.
piezo electric material
D.
pyro electrical material
Ans:
piezo electric material
Explanation :
In most applications, ultrasonic waves are generated by a transducer that includes a piezoelectric material (crystal) that converts electrical energy (electric current) to mechanical energy (sound waves).
[22] Least audible sound for most of the human ear is –
A.
10.0 μ bar
B.
0.0002 μ bar
C.
0.005 μ bar
D.
5.0 μ bar
Ans:
0.0002 μ bar
Explanation :
Least audible sound for most of the human ear is 2 x 10-5 pascal. The generally accepted standard range of audible frequencies is 20 to 20,000 Hz.
[23] Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known as:
A.
Mixing ratio
B.
Relative humidity
C.
Absolute humidity
D.
Specific humidity
Ans:
Absolute humidity
Explanation :
The relative humidity of air at a given temperature is the ratio of mass of water vapour actually present in a certain volume of air to the mass of water vapour required to saturate the same volume of air at the same temperature, multiplied by 100.
[24] Which of the following is a conductor of electricity?
A.
Rubber
B.
Pure water
C.
Salt water
D.
Benzene
Ans:
Salt water
Explanation :
Pure water is actually an extremely poor conductor, but saturated salt water is a good conductor. The saltier the water, the better the conductance. The reason it conducts electricity is because the NaCl (sodium chloride) breaks apart into a positively charged Na+ and a negatively charged Chlorine CF. When current is applied, it is easily conducted by the highly charged ions.
[25] The opening and closing of the stomatal pores is a function of the -
A.
Guard cells
B.
Chloroplast
C.
Xylem
D.
Phloem
Ans:
Guard cells
Explanation :
The opening and closing of the pores is a function of the guard cells. They swell when water flows into them, causing the stomatal pore to open and likewise, the pore closes if the guard cells shrink.
Explanation :
The waves produced on the surface of water in the pond are an example of transverse waves as particles of the medium do not move along with the wave. Only the disturbance is carried forward. Another example of such waves is the vibrations of a string.
[14] A cyclone is an engineering device that is used to -
A.
transport materials
B.
segregate particles
C.
control switching devices
D.
model fractals
Ans:
segregate particles
Explanation :
When removing particulate matter from liquid, a hydrocyclone issued; while from gas, a gas cyclone is used.
[15] The density of water is 1 g/cc. This is strictly valid at –
A.
0°C
B.
4°C
C.
25°C
D.
100°C
Ans:
4°C
Explanation :
Water never has an absolute density because its density varies with temperature. Water has its maximum density of 1 g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3. Water has the maximum density of 1 g/cm3 only when it is pure water.
[16] Which of the following is one of the commercial products obtained from Gelidium and Gracilaria and are used to grow microbes and in preparations of ice-creams and jellies?
A.
Agar
B.
Chlorella
C.
Spirullina
D.
Gymnosperms
Ans:
Agar
Explanation :
Agar, one of the commercial products obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies.
[17] In an electric motor, the energy transformation is from _.
A.
electrical to chemical
B.
chemical to light
C.
mechanical to electrical
D.
electrical to mechanical
Ans:
electrical to mechanical
Explanation :
An electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this would be the conversion of mechanical energy into electrical energy and is done by an electric generator.
[18] A radioactive substance does not undergo any change (in mass or charge) during –
A.
gamma-emission
B.
oxidation
C.
alpha-emission
D.
beta-emission
Ans:
gamma-emission
Explanation :
Gamma-rays do not carry any charge. These rays do not have any mass and hence can not be considered to be made up of particles.
[19] On a rainy day, small oil films on water show brilliant colors. This is due to -
A.
dispersion
B.
interference
C.
diffraction
D.
polarization
Ans:
interference
Explanation :
The combination of two or more electromagnetic waveforms to form a resultant wave in which the displacement is either reinforced or cancelled.
[20] The waveform of a certain signal can be studied by –
A.
Spectrometer
B.
Cathode ray oscilloscope
C.
p - n junction diode
D.
Sonometer
Ans:
Sonometer
Explanation :
A spectrometer is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. Cathode ray oscilloscope is an electronic display device containing cathode- ray tube (CRT) that generates an electron beam that is used to produce visible patterns or graphs on a phosphorescent screen.
[21] Ultrasonic waves are produced by making use of -
A.
ferro magnetic material
B.
ferri magnetic material
C.
piezo electric material
D.
pyro electrical material
Ans:
piezo electric material
Explanation :
In most applications, ultrasonic waves are generated by a transducer that includes a piezoelectric material (crystal) that converts electrical energy (electric current) to mechanical energy (sound waves).
[22] Least audible sound for most of the human ear is –
A.
10.0 μ bar
B.
0.0002 μ bar
C.
0.005 μ bar
D.
5.0 μ bar
Ans:
0.0002 μ bar
Explanation :
Least audible sound for most of the human ear is 2 x 10-5 pascal. The generally accepted standard range of audible frequencies is 20 to 20,000 Hz.
[23] Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known as:
A.
Mixing ratio
B.
Relative humidity
C.
Absolute humidity
D.
Specific humidity
Ans:
Absolute humidity
Explanation :
The relative humidity of air at a given temperature is the ratio of mass of water vapour actually present in a certain volume of air to the mass of water vapour required to saturate the same volume of air at the same temperature, multiplied by 100.
[24] Which of the following is a conductor of electricity?
A.
Rubber
B.
Pure water
C.
Salt water
D.
Benzene
Ans:
Salt water
Explanation :
Pure water is actually an extremely poor conductor, but saturated salt water is a good conductor. The saltier the water, the better the conductance. The reason it conducts electricity is because the NaCl (sodium chloride) breaks apart into a positively charged Na+ and a negatively charged Chlorine CF. When current is applied, it is easily conducted by the highly charged ions.
[25] The opening and closing of the stomatal pores is a function of the -
A.
Guard cells
B.
Chloroplast
C.
Xylem
D.
Phloem
Ans:
Guard cells
Explanation :
The opening and closing of the pores is a function of the guard cells. They swell when water flows into them, causing the stomatal pore to open and likewise, the pore closes if the guard cells shrink.
Explanation :
Water never has an absolute density because its density varies with temperature. Water has its maximum density of 1 g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3. Water has the maximum density of 1 g/cm3 only when it is pure water.
[16] Which of the following is one of the commercial products obtained from Gelidium and Gracilaria and are used to grow microbes and in preparations of ice-creams and jellies?
A.
Agar
B.
Chlorella
C.
Spirullina
D.
Gymnosperms
Ans:
Agar
Explanation :
Agar, one of the commercial products obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies.
[17] In an electric motor, the energy transformation is from _.
A.
electrical to chemical
B.
chemical to light
C.
mechanical to electrical
D.
electrical to mechanical
Ans:
electrical to mechanical
Explanation :
An electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this would be the conversion of mechanical energy into electrical energy and is done by an electric generator.
[18] A radioactive substance does not undergo any change (in mass or charge) during –
A.
gamma-emission
B.
oxidation
C.
alpha-emission
D.
beta-emission
Ans:
gamma-emission
Explanation :
Gamma-rays do not carry any charge. These rays do not have any mass and hence can not be considered to be made up of particles.
[19] On a rainy day, small oil films on water show brilliant colors. This is due to -
A.
dispersion
B.
interference
C.
diffraction
D.
polarization
Ans:
interference
Explanation :
The combination of two or more electromagnetic waveforms to form a resultant wave in which the displacement is either reinforced or cancelled.
[20] The waveform of a certain signal can be studied by –
A.
Spectrometer
B.
Cathode ray oscilloscope
C.
p - n junction diode
D.
Sonometer
Ans:
Sonometer
Explanation :
A spectrometer is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. Cathode ray oscilloscope is an electronic display device containing cathode- ray tube (CRT) that generates an electron beam that is used to produce visible patterns or graphs on a phosphorescent screen.
[21] Ultrasonic waves are produced by making use of -
A.
ferro magnetic material
B.
ferri magnetic material
C.
piezo electric material
D.
pyro electrical material
Ans:
piezo electric material
Explanation :
In most applications, ultrasonic waves are generated by a transducer that includes a piezoelectric material (crystal) that converts electrical energy (electric current) to mechanical energy (sound waves).
[22] Least audible sound for most of the human ear is –
A.
10.0 μ bar
B.
0.0002 μ bar
C.
0.005 μ bar
D.
5.0 μ bar
Ans:
0.0002 μ bar
Explanation :
Least audible sound for most of the human ear is 2 x 10-5 pascal. The generally accepted standard range of audible frequencies is 20 to 20,000 Hz.
[23] Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known as:
A.
Mixing ratio
B.
Relative humidity
C.
Absolute humidity
D.
Specific humidity
Ans:
Absolute humidity
Explanation :
The relative humidity of air at a given temperature is the ratio of mass of water vapour actually present in a certain volume of air to the mass of water vapour required to saturate the same volume of air at the same temperature, multiplied by 100.
[24] Which of the following is a conductor of electricity?
A.
Rubber
B.
Pure water
C.
Salt water
D.
Benzene
Ans:
Salt water
Explanation :
Pure water is actually an extremely poor conductor, but saturated salt water is a good conductor. The saltier the water, the better the conductance. The reason it conducts electricity is because the NaCl (sodium chloride) breaks apart into a positively charged Na+ and a negatively charged Chlorine CF. When current is applied, it is easily conducted by the highly charged ions.
[25] The opening and closing of the stomatal pores is a function of the -
A.
Guard cells
B.
Chloroplast
C.
Xylem
D.
Phloem
Ans:
Guard cells
Explanation :
The opening and closing of the pores is a function of the guard cells. They swell when water flows into them, causing the stomatal pore to open and likewise, the pore closes if the guard cells shrink.
Explanation :
An electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this would be the conversion of mechanical energy into electrical energy and is done by an electric generator.
[18] A radioactive substance does not undergo any change (in mass or charge) during –
A.
gamma-emission
B.
oxidation
C.
alpha-emission
D.
beta-emission
Ans:
gamma-emission
Explanation :
Gamma-rays do not carry any charge. These rays do not have any mass and hence can not be considered to be made up of particles.
[19] On a rainy day, small oil films on water show brilliant colors. This is due to -
A.
dispersion
B.
interference
C.
diffraction
D.
polarization
Ans:
interference
Explanation :
The combination of two or more electromagnetic waveforms to form a resultant wave in which the displacement is either reinforced or cancelled.
[20] The waveform of a certain signal can be studied by –
A.
Spectrometer
B.
Cathode ray oscilloscope
C.
p - n junction diode
D.
Sonometer
Ans:
Sonometer
Explanation :
A spectrometer is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. Cathode ray oscilloscope is an electronic display device containing cathode- ray tube (CRT) that generates an electron beam that is used to produce visible patterns or graphs on a phosphorescent screen.
[21] Ultrasonic waves are produced by making use of -
A.
ferro magnetic material
B.
ferri magnetic material
C.
piezo electric material
D.
pyro electrical material
Ans:
piezo electric material
Explanation :
In most applications, ultrasonic waves are generated by a transducer that includes a piezoelectric material (crystal) that converts electrical energy (electric current) to mechanical energy (sound waves).
[22] Least audible sound for most of the human ear is –
A.
10.0 μ bar
B.
0.0002 μ bar
C.
0.005 μ bar
D.
5.0 μ bar
Ans:
0.0002 μ bar
Explanation :
Least audible sound for most of the human ear is 2 x 10-5 pascal. The generally accepted standard range of audible frequencies is 20 to 20,000 Hz.
[23] Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known as:
A.
Mixing ratio
B.
Relative humidity
C.
Absolute humidity
D.
Specific humidity
Ans:
Absolute humidity
Explanation :
The relative humidity of air at a given temperature is the ratio of mass of water vapour actually present in a certain volume of air to the mass of water vapour required to saturate the same volume of air at the same temperature, multiplied by 100.
[24] Which of the following is a conductor of electricity?
A.
Rubber
B.
Pure water
C.
Salt water
D.
Benzene
Ans:
Salt water
Explanation :
Pure water is actually an extremely poor conductor, but saturated salt water is a good conductor. The saltier the water, the better the conductance. The reason it conducts electricity is because the NaCl (sodium chloride) breaks apart into a positively charged Na+ and a negatively charged Chlorine CF. When current is applied, it is easily conducted by the highly charged ions.
[25] The opening and closing of the stomatal pores is a function of the -
A.
Guard cells
B.
Chloroplast
C.
Xylem
D.
Phloem
Ans:
Guard cells
Explanation :
The opening and closing of the pores is a function of the guard cells. They swell when water flows into them, causing the stomatal pore to open and likewise, the pore closes if the guard cells shrink.
Explanation :
The combination of two or more electromagnetic waveforms to form a resultant wave in which the displacement is either reinforced or cancelled.
[20] The waveform of a certain signal can be studied by –
A.
Spectrometer
B.
Cathode ray oscilloscope
C.
p - n junction diode
D.
Sonometer
Ans:
Sonometer
Explanation :
A spectrometer is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. Cathode ray oscilloscope is an electronic display device containing cathode- ray tube (CRT) that generates an electron beam that is used to produce visible patterns or graphs on a phosphorescent screen.
[21] Ultrasonic waves are produced by making use of -
A.
ferro magnetic material
B.
ferri magnetic material
C.
piezo electric material
D.
pyro electrical material
Ans:
piezo electric material
Explanation :
In most applications, ultrasonic waves are generated by a transducer that includes a piezoelectric material (crystal) that converts electrical energy (electric current) to mechanical energy (sound waves).
[22] Least audible sound for most of the human ear is –
A.
10.0 μ bar
B.
0.0002 μ bar
C.
0.005 μ bar
D.
5.0 μ bar
Ans:
0.0002 μ bar
Explanation :
Least audible sound for most of the human ear is 2 x 10-5 pascal. The generally accepted standard range of audible frequencies is 20 to 20,000 Hz.
[23] Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known as:
A.
Mixing ratio
B.
Relative humidity
C.
Absolute humidity
D.
Specific humidity
Ans:
Absolute humidity
Explanation :
The relative humidity of air at a given temperature is the ratio of mass of water vapour actually present in a certain volume of air to the mass of water vapour required to saturate the same volume of air at the same temperature, multiplied by 100.
[24] Which of the following is a conductor of electricity?
A.
Rubber
B.
Pure water
C.
Salt water
D.
Benzene
Ans:
Salt water
Explanation :
Pure water is actually an extremely poor conductor, but saturated salt water is a good conductor. The saltier the water, the better the conductance. The reason it conducts electricity is because the NaCl (sodium chloride) breaks apart into a positively charged Na+ and a negatively charged Chlorine CF. When current is applied, it is easily conducted by the highly charged ions.
[25] The opening and closing of the stomatal pores is a function of the -
A.
Guard cells
B.
Chloroplast
C.
Xylem
D.
Phloem
Ans:
Guard cells
Explanation :
The opening and closing of the pores is a function of the guard cells. They swell when water flows into them, causing the stomatal pore to open and likewise, the pore closes if the guard cells shrink.
Explanation :
In most applications, ultrasonic waves are generated by a transducer that includes a piezoelectric material (crystal) that converts electrical energy (electric current) to mechanical energy (sound waves).
[22] Least audible sound for most of the human ear is –
A.
10.0 μ bar
B.
0.0002 μ bar
C.
0.005 μ bar
D.
5.0 μ bar
Ans:
0.0002 μ bar
Explanation :
Least audible sound for most of the human ear is 2 x 10-5 pascal. The generally accepted standard range of audible frequencies is 20 to 20,000 Hz.
[23] Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known as:
A.
Mixing ratio
B.
Relative humidity
C.
Absolute humidity
D.
Specific humidity
Ans:
Absolute humidity
Explanation :
The relative humidity of air at a given temperature is the ratio of mass of water vapour actually present in a certain volume of air to the mass of water vapour required to saturate the same volume of air at the same temperature, multiplied by 100.
[24] Which of the following is a conductor of electricity?
A.
Rubber
B.
Pure water
C.
Salt water
D.
Benzene
Ans:
Salt water
Explanation :
Pure water is actually an extremely poor conductor, but saturated salt water is a good conductor. The saltier the water, the better the conductance. The reason it conducts electricity is because the NaCl (sodium chloride) breaks apart into a positively charged Na+ and a negatively charged Chlorine CF. When current is applied, it is easily conducted by the highly charged ions.
[25] The opening and closing of the stomatal pores is a function of the -
A.
Guard cells
B.
Chloroplast
C.
Xylem
D.
Phloem
Ans:
Guard cells
Explanation :
The opening and closing of the pores is a function of the guard cells. They swell when water flows into them, causing the stomatal pore to open and likewise, the pore closes if the guard cells shrink.
Explanation :
The relative humidity of air at a given temperature is the ratio of mass of water vapour actually present in a certain volume of air to the mass of water vapour required to saturate the same volume of air at the same temperature, multiplied by 100.
[24] Which of the following is a conductor of electricity?
A.
Rubber
B.
Pure water
C.
Salt water
D.
Benzene
Ans:
Salt water
Explanation :
Pure water is actually an extremely poor conductor, but saturated salt water is a good conductor. The saltier the water, the better the conductance. The reason it conducts electricity is because the NaCl (sodium chloride) breaks apart into a positively charged Na+ and a negatively charged Chlorine CF. When current is applied, it is easily conducted by the highly charged ions.
[25] The opening and closing of the stomatal pores is a function of the -
A.
Guard cells
B.
Chloroplast
C.
Xylem
D.
Phloem
Ans:
Guard cells
Explanation :
The opening and closing of the pores is a function of the guard cells. They swell when water flows into them, causing the stomatal pore to open and likewise, the pore closes if the guard cells shrink.
Explanation :
The opening and closing of the pores is a function of the guard cells. They swell when water flows into them, causing the stomatal pore to open and likewise, the pore closes if the guard cells shrink.