[1] Vehicles use to see the objects coming from behind.
A.
Concave lens
B.
Convex lens
C.
Convex mirror
D.
Concave mirror
Ans:
Convex lens
Explanation :
Convex mirror is used in rear view mirror of vehicles; so that the driver can see the traffic coming from behind. The field of view is widest in case of a convex mirror, which enables it to show a wider area from behind.
[2] If electrical conductivity increases with the increase of temperature of a substance, then it is a:
A.
Conductor
B.
Semiconductor
C.
Insulator
D.
Carborator
Ans:
Semiconductor
Explanation :
A solid substance that has conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects
[3] Transition ions absorb light in –
A.
infrared region
B.
ultraviolet region
C.
microwave region
D.
visible region
Ans:
visible region
Explanation :
Transition metal ions have an incomplete set of 3d electrons. Changes in the energy of these electrons correspond to the energy of visible light. The absorption of visible light by these ions lend colour to gems.
[4] If a body weighs 12N on the surface of the earth, how much will it weigh on the surface of the moon where acceleration due to gravity is only one-sixth of that on earth's surface?
A.
12N
B.
2N
C.
10N
D.
6N
Ans:
2N
Explanation :
Weight is mass x g. Since mass is constant and g is only 16thof that on the earth. The weight on the moon is only 16th of that on the earth.
[5] 'Kilowatt-hour' is the unit of -
A.
potential difference
B.
electric power
C.
electric energy
D.
electric potential
Ans:
electric energy
Explanation :
The kilowatt hour (symbolized kW⋅h as per SI) is a composite unit of energy equivalent to one kilowatt (1 kW) of power sustained for one hour.
[6] One micron is equal to-
A.
1/10th of mm
B.
1/100th of mm
C.
1/1000th of mm
D.
1/10000th of mm
Ans:
1/1000th of mm
Explanation :
In the U.S. the thickness of paint is expressed in mils (one mil equals 1/1000 of inch). The rest of the world expresses coating thickness in microns (1 micron = 1 millionth of a meter and 25.4 microns = .001” inch or 1 mil).
[7] If the temperature inside a room is increased, the relative humidity will ?
A.
increase
B.
decrease
C.
remain unchanged
D.
none of these
Ans:
decrease
Explanation :
This is because temperatures in the home can be much different than the temperature outside. This is because of that important relationship between temperature and how much maximum moisture can be in the air.
[8] The device used to change the speed of an electric fan is -
A.
Amplifier
B.
Regulator
C.
Switclh
D.
Rectifier
Ans:
Regulator
Explanation :
Regulator is to adjust the voltage across the motor of the fan.
[9] The required DC voltage for arc welding is-
A.
6 to 9 V
B.
50 to 60 V
C.
200 to 250 V
D.
90 to 100 V
Ans:
200 to 250 V
Explanation :
0
[10] What is the base of the Octal Numeral System?
A.
8
B.
16
C.
32
D.
64
Ans:
8
Explanation :
The octal numeral system is the base-8 number system and uses the digits 0 to 7. As it uses only eight digits (0 through 7) there are no numbers or letters used above 8.
[11] A wire carrying current is –
A.
positively charged
B.
negatively charged
C.
neutral
D.
charged with a type depending upon current strength
Ans:
neutral
Explanation :
0
[12] A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers.
A.
reflection
B.
refraction
C.
diffraction
D.
total internal reflection
Ans:
total internal reflection
Explanation :
If the angle of incidence of light ray in the denser medium is greater than the critical angle of the concerned media pair, the light is not at all reflected in to the rarer medium but is totally reflected. This is known as 'total internal reflection'.
[13] Which of the following physical quantities has no dimension?
A.
Force
B.
Momentum
C.
Impulse
D.
Angle
Ans:
Angle
Explanation :
Quantities having units, but no dimensions: Plane angle, angular displacement, solid angle. These physical quantities possess units but they does not possess dimensional formulas.
[14] Which of the following is a good conductor of heat but bad conductor of electricity?
A.
mica
B.
asbestos
C.
celluloid
D.
paraffin wax
Ans:
mica
Explanation :
Good conductors of heat are good conductors of electricity. Mica is an exception which although being a good conductor of heat and a bad conductor of electricity. It is commonly used in insulation of electricity between high heat generating transistors and their heat sink and or chassis to prevent grounding out of component and to assist in the transfer of the generated heat to the heat sink or chassis for dissipation.
[15] Respiration in the absence of air is called -
A.
Aerobic respiration
B.
Anaerobic respiration
C.
Muscular respiration
D.
Molecular respiration
Ans:
Anaerobic respiration
Explanation :
Respiration in the absence of air is called Anaerobic respiration while respiration in the presence of air (oxygen) is called aerobic respiration.
[16] Which one among the following is responsible for formation of "Ozone Holes" in the atmosphere?
A.
Benzopyrene
B.
Hydrocarbons
C.
Chlorofluorocarbons
D.
UV radiation
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon (CFCs), commonly known by the DuPont brand name Freon, are considered as one of the ozone-depleting substances.
[17] An alloy is an example of :
A.
Colloidal solution
B.
Emulsion
C.
Solid solution
D.
Heterogeneous mixture
Ans:
Solid solution
Explanation :
A Solid solution is a uniform mixture of substances in solid form.
[18] Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be -
A.
2
B.
6
C.
5
D.
3
Ans:
6
Explanation :
Number of spectral lines from a state n to ground state is = n (n-1)/2 =4(4-1)/2 6 6
[19] The resistance of a conductor is inversely proportional to its -
A.
temperature
B.
resistivity
C.
area of cross section
D.
length
Ans:
area of cross section
Explanation :
The resistance of a current carrying conductor is inversely proportional to the area of cross section of the conductor. This is because the resistance occurs due to the collision of electrons/charged particles.
[20] is the perpendicular distance between point of application of force and axis of rotation.
A.
Moment arm
B.
Moment of Inertia
C.
Altitude
D.
Base
Ans:
Moment arm
Explanation :
The magnitude of the moment of force acting about a point or axis is directly proportional to the distance of the force from the point or axis.
[21] 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.
[22] For which one of the following, ‘Diodes' are generally used for?
A.
Rectification
B.
Amplification
C.
Modulation
D.
Filtration
Ans:
Rectification
Explanation :
A rectifier diode is a two-lead semiconductor that allows current to pass in only one direction. Many types of diodes are used for a wide range of applications. Rectifier diodes are a vital component in power supplies
[23] An object is placed on the principal axis of a convex lens of focal length 10 cm. If the distance of the object from the lens is 30 cm, what is the distance of the image formed?
A.
20 cm
B.
15 cm
C.
30 cm
D.
10 cm
Ans:
15 cm
Explanation :
0
[24] A moving neutron collides with a stationary α-particle. The fraction of the kinetic energy lost by the neutron is –
A.
¼
B.
1/16
C.
9/25
D.
16/25
Ans:
16/25
Explanation :
0
[25] Which of these waves can be polarized?
A.
Sound waves in air
B.
Longitudinal waves on a string
C.
Transverse waves on a string
D.
Light waves
Ans:
Light waves
Explanation :
It is possible to transform unpolarized light into polarized light. A light wave that is vibrating in more than one plane is referred to as unpolarized light. Polarized light waves are light waves in which the vibrations occur in a single plane.
Explanation :
Convex mirror is used in rear view mirror of vehicles; so that the driver can see the traffic coming from behind. The field of view is widest in case of a convex mirror, which enables it to show a wider area from behind.
[2] If electrical conductivity increases with the increase of temperature of a substance, then it is a:
A.
Conductor
B.
Semiconductor
C.
Insulator
D.
Carborator
Ans:
Semiconductor
Explanation :
A solid substance that has conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects
[3] Transition ions absorb light in –
A.
infrared region
B.
ultraviolet region
C.
microwave region
D.
visible region
Ans:
visible region
Explanation :
Transition metal ions have an incomplete set of 3d electrons. Changes in the energy of these electrons correspond to the energy of visible light. The absorption of visible light by these ions lend colour to gems.
[4] If a body weighs 12N on the surface of the earth, how much will it weigh on the surface of the moon where acceleration due to gravity is only one-sixth of that on earth's surface?
A.
12N
B.
2N
C.
10N
D.
6N
Ans:
2N
Explanation :
Weight is mass x g. Since mass is constant and g is only 16thof that on the earth. The weight on the moon is only 16th of that on the earth.
[5] 'Kilowatt-hour' is the unit of -
A.
potential difference
B.
electric power
C.
electric energy
D.
electric potential
Ans:
electric energy
Explanation :
The kilowatt hour (symbolized kW⋅h as per SI) is a composite unit of energy equivalent to one kilowatt (1 kW) of power sustained for one hour.
[6] One micron is equal to-
A.
1/10th of mm
B.
1/100th of mm
C.
1/1000th of mm
D.
1/10000th of mm
Ans:
1/1000th of mm
Explanation :
In the U.S. the thickness of paint is expressed in mils (one mil equals 1/1000 of inch). The rest of the world expresses coating thickness in microns (1 micron = 1 millionth of a meter and 25.4 microns = .001” inch or 1 mil).
[7] If the temperature inside a room is increased, the relative humidity will ?
A.
increase
B.
decrease
C.
remain unchanged
D.
none of these
Ans:
decrease
Explanation :
This is because temperatures in the home can be much different than the temperature outside. This is because of that important relationship between temperature and how much maximum moisture can be in the air.
[8] The device used to change the speed of an electric fan is -
A.
Amplifier
B.
Regulator
C.
Switclh
D.
Rectifier
Ans:
Regulator
Explanation :
Regulator is to adjust the voltage across the motor of the fan.
[9] The required DC voltage for arc welding is-
A.
6 to 9 V
B.
50 to 60 V
C.
200 to 250 V
D.
90 to 100 V
Ans:
200 to 250 V
Explanation :
0
[10] What is the base of the Octal Numeral System?
A.
8
B.
16
C.
32
D.
64
Ans:
8
Explanation :
The octal numeral system is the base-8 number system and uses the digits 0 to 7. As it uses only eight digits (0 through 7) there are no numbers or letters used above 8.
[11] A wire carrying current is –
A.
positively charged
B.
negatively charged
C.
neutral
D.
charged with a type depending upon current strength
Ans:
neutral
Explanation :
0
[12] A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers.
A.
reflection
B.
refraction
C.
diffraction
D.
total internal reflection
Ans:
total internal reflection
Explanation :
If the angle of incidence of light ray in the denser medium is greater than the critical angle of the concerned media pair, the light is not at all reflected in to the rarer medium but is totally reflected. This is known as 'total internal reflection'.
[13] Which of the following physical quantities has no dimension?
A.
Force
B.
Momentum
C.
Impulse
D.
Angle
Ans:
Angle
Explanation :
Quantities having units, but no dimensions: Plane angle, angular displacement, solid angle. These physical quantities possess units but they does not possess dimensional formulas.
[14] Which of the following is a good conductor of heat but bad conductor of electricity?
A.
mica
B.
asbestos
C.
celluloid
D.
paraffin wax
Ans:
mica
Explanation :
Good conductors of heat are good conductors of electricity. Mica is an exception which although being a good conductor of heat and a bad conductor of electricity. It is commonly used in insulation of electricity between high heat generating transistors and their heat sink and or chassis to prevent grounding out of component and to assist in the transfer of the generated heat to the heat sink or chassis for dissipation.
[15] Respiration in the absence of air is called -
A.
Aerobic respiration
B.
Anaerobic respiration
C.
Muscular respiration
D.
Molecular respiration
Ans:
Anaerobic respiration
Explanation :
Respiration in the absence of air is called Anaerobic respiration while respiration in the presence of air (oxygen) is called aerobic respiration.
[16] Which one among the following is responsible for formation of "Ozone Holes" in the atmosphere?
A.
Benzopyrene
B.
Hydrocarbons
C.
Chlorofluorocarbons
D.
UV radiation
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon (CFCs), commonly known by the DuPont brand name Freon, are considered as one of the ozone-depleting substances.
[17] An alloy is an example of :
A.
Colloidal solution
B.
Emulsion
C.
Solid solution
D.
Heterogeneous mixture
Ans:
Solid solution
Explanation :
A Solid solution is a uniform mixture of substances in solid form.
[18] Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be -
A.
2
B.
6
C.
5
D.
3
Ans:
6
Explanation :
Number of spectral lines from a state n to ground state is = n (n-1)/2 =4(4-1)/2 6 6
[19] The resistance of a conductor is inversely proportional to its -
A.
temperature
B.
resistivity
C.
area of cross section
D.
length
Ans:
area of cross section
Explanation :
The resistance of a current carrying conductor is inversely proportional to the area of cross section of the conductor. This is because the resistance occurs due to the collision of electrons/charged particles.
[20] is the perpendicular distance between point of application of force and axis of rotation.
A.
Moment arm
B.
Moment of Inertia
C.
Altitude
D.
Base
Ans:
Moment arm
Explanation :
The magnitude of the moment of force acting about a point or axis is directly proportional to the distance of the force from the point or axis.
[21] 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.
[22] For which one of the following, ‘Diodes' are generally used for?
A.
Rectification
B.
Amplification
C.
Modulation
D.
Filtration
Ans:
Rectification
Explanation :
A rectifier diode is a two-lead semiconductor that allows current to pass in only one direction. Many types of diodes are used for a wide range of applications. Rectifier diodes are a vital component in power supplies
[23] An object is placed on the principal axis of a convex lens of focal length 10 cm. If the distance of the object from the lens is 30 cm, what is the distance of the image formed?
A.
20 cm
B.
15 cm
C.
30 cm
D.
10 cm
Ans:
15 cm
Explanation :
0
[24] A moving neutron collides with a stationary α-particle. The fraction of the kinetic energy lost by the neutron is –
A.
¼
B.
1/16
C.
9/25
D.
16/25
Ans:
16/25
Explanation :
0
[25] Which of these waves can be polarized?
A.
Sound waves in air
B.
Longitudinal waves on a string
C.
Transverse waves on a string
D.
Light waves
Ans:
Light waves
Explanation :
It is possible to transform unpolarized light into polarized light. A light wave that is vibrating in more than one plane is referred to as unpolarized light. Polarized light waves are light waves in which the vibrations occur in a single plane.
Explanation :
Transition metal ions have an incomplete set of 3d electrons. Changes in the energy of these electrons correspond to the energy of visible light. The absorption of visible light by these ions lend colour to gems.
[4] If a body weighs 12N on the surface of the earth, how much will it weigh on the surface of the moon where acceleration due to gravity is only one-sixth of that on earth's surface?
A.
12N
B.
2N
C.
10N
D.
6N
Ans:
2N
Explanation :
Weight is mass x g. Since mass is constant and g is only 16thof that on the earth. The weight on the moon is only 16th of that on the earth.
[5] 'Kilowatt-hour' is the unit of -
A.
potential difference
B.
electric power
C.
electric energy
D.
electric potential
Ans:
electric energy
Explanation :
The kilowatt hour (symbolized kW⋅h as per SI) is a composite unit of energy equivalent to one kilowatt (1 kW) of power sustained for one hour.
[6] One micron is equal to-
A.
1/10th of mm
B.
1/100th of mm
C.
1/1000th of mm
D.
1/10000th of mm
Ans:
1/1000th of mm
Explanation :
In the U.S. the thickness of paint is expressed in mils (one mil equals 1/1000 of inch). The rest of the world expresses coating thickness in microns (1 micron = 1 millionth of a meter and 25.4 microns = .001” inch or 1 mil).
[7] If the temperature inside a room is increased, the relative humidity will ?
A.
increase
B.
decrease
C.
remain unchanged
D.
none of these
Ans:
decrease
Explanation :
This is because temperatures in the home can be much different than the temperature outside. This is because of that important relationship between temperature and how much maximum moisture can be in the air.
[8] The device used to change the speed of an electric fan is -
A.
Amplifier
B.
Regulator
C.
Switclh
D.
Rectifier
Ans:
Regulator
Explanation :
Regulator is to adjust the voltage across the motor of the fan.
[9] The required DC voltage for arc welding is-
A.
6 to 9 V
B.
50 to 60 V
C.
200 to 250 V
D.
90 to 100 V
Ans:
200 to 250 V
Explanation :
0
[10] What is the base of the Octal Numeral System?
A.
8
B.
16
C.
32
D.
64
Ans:
8
Explanation :
The octal numeral system is the base-8 number system and uses the digits 0 to 7. As it uses only eight digits (0 through 7) there are no numbers or letters used above 8.
[11] A wire carrying current is –
A.
positively charged
B.
negatively charged
C.
neutral
D.
charged with a type depending upon current strength
Ans:
neutral
Explanation :
0
[12] A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers.
A.
reflection
B.
refraction
C.
diffraction
D.
total internal reflection
Ans:
total internal reflection
Explanation :
If the angle of incidence of light ray in the denser medium is greater than the critical angle of the concerned media pair, the light is not at all reflected in to the rarer medium but is totally reflected. This is known as 'total internal reflection'.
[13] Which of the following physical quantities has no dimension?
A.
Force
B.
Momentum
C.
Impulse
D.
Angle
Ans:
Angle
Explanation :
Quantities having units, but no dimensions: Plane angle, angular displacement, solid angle. These physical quantities possess units but they does not possess dimensional formulas.
[14] Which of the following is a good conductor of heat but bad conductor of electricity?
A.
mica
B.
asbestos
C.
celluloid
D.
paraffin wax
Ans:
mica
Explanation :
Good conductors of heat are good conductors of electricity. Mica is an exception which although being a good conductor of heat and a bad conductor of electricity. It is commonly used in insulation of electricity between high heat generating transistors and their heat sink and or chassis to prevent grounding out of component and to assist in the transfer of the generated heat to the heat sink or chassis for dissipation.
[15] Respiration in the absence of air is called -
A.
Aerobic respiration
B.
Anaerobic respiration
C.
Muscular respiration
D.
Molecular respiration
Ans:
Anaerobic respiration
Explanation :
Respiration in the absence of air is called Anaerobic respiration while respiration in the presence of air (oxygen) is called aerobic respiration.
[16] Which one among the following is responsible for formation of "Ozone Holes" in the atmosphere?
A.
Benzopyrene
B.
Hydrocarbons
C.
Chlorofluorocarbons
D.
UV radiation
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon (CFCs), commonly known by the DuPont brand name Freon, are considered as one of the ozone-depleting substances.
[17] An alloy is an example of :
A.
Colloidal solution
B.
Emulsion
C.
Solid solution
D.
Heterogeneous mixture
Ans:
Solid solution
Explanation :
A Solid solution is a uniform mixture of substances in solid form.
[18] Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be -
A.
2
B.
6
C.
5
D.
3
Ans:
6
Explanation :
Number of spectral lines from a state n to ground state is = n (n-1)/2 =4(4-1)/2 6 6
[19] The resistance of a conductor is inversely proportional to its -
A.
temperature
B.
resistivity
C.
area of cross section
D.
length
Ans:
area of cross section
Explanation :
The resistance of a current carrying conductor is inversely proportional to the area of cross section of the conductor. This is because the resistance occurs due to the collision of electrons/charged particles.
[20] is the perpendicular distance between point of application of force and axis of rotation.
A.
Moment arm
B.
Moment of Inertia
C.
Altitude
D.
Base
Ans:
Moment arm
Explanation :
The magnitude of the moment of force acting about a point or axis is directly proportional to the distance of the force from the point or axis.
[21] 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.
[22] For which one of the following, ‘Diodes' are generally used for?
A.
Rectification
B.
Amplification
C.
Modulation
D.
Filtration
Ans:
Rectification
Explanation :
A rectifier diode is a two-lead semiconductor that allows current to pass in only one direction. Many types of diodes are used for a wide range of applications. Rectifier diodes are a vital component in power supplies
[23] An object is placed on the principal axis of a convex lens of focal length 10 cm. If the distance of the object from the lens is 30 cm, what is the distance of the image formed?
A.
20 cm
B.
15 cm
C.
30 cm
D.
10 cm
Ans:
15 cm
Explanation :
0
[24] A moving neutron collides with a stationary α-particle. The fraction of the kinetic energy lost by the neutron is –
A.
¼
B.
1/16
C.
9/25
D.
16/25
Ans:
16/25
Explanation :
0
[25] Which of these waves can be polarized?
A.
Sound waves in air
B.
Longitudinal waves on a string
C.
Transverse waves on a string
D.
Light waves
Ans:
Light waves
Explanation :
It is possible to transform unpolarized light into polarized light. A light wave that is vibrating in more than one plane is referred to as unpolarized light. Polarized light waves are light waves in which the vibrations occur in a single plane.
Explanation :
The kilowatt hour (symbolized kW⋅h as per SI) is a composite unit of energy equivalent to one kilowatt (1 kW) of power sustained for one hour.
[6] One micron is equal to-
A.
1/10th of mm
B.
1/100th of mm
C.
1/1000th of mm
D.
1/10000th of mm
Ans:
1/1000th of mm
Explanation :
In the U.S. the thickness of paint is expressed in mils (one mil equals 1/1000 of inch). The rest of the world expresses coating thickness in microns (1 micron = 1 millionth of a meter and 25.4 microns = .001” inch or 1 mil).
[7] If the temperature inside a room is increased, the relative humidity will ?
A.
increase
B.
decrease
C.
remain unchanged
D.
none of these
Ans:
decrease
Explanation :
This is because temperatures in the home can be much different than the temperature outside. This is because of that important relationship between temperature and how much maximum moisture can be in the air.
[8] The device used to change the speed of an electric fan is -
A.
Amplifier
B.
Regulator
C.
Switclh
D.
Rectifier
Ans:
Regulator
Explanation :
Regulator is to adjust the voltage across the motor of the fan.
[9] The required DC voltage for arc welding is-
A.
6 to 9 V
B.
50 to 60 V
C.
200 to 250 V
D.
90 to 100 V
Ans:
200 to 250 V
Explanation :
0
[10] What is the base of the Octal Numeral System?
A.
8
B.
16
C.
32
D.
64
Ans:
8
Explanation :
The octal numeral system is the base-8 number system and uses the digits 0 to 7. As it uses only eight digits (0 through 7) there are no numbers or letters used above 8.
[11] A wire carrying current is –
A.
positively charged
B.
negatively charged
C.
neutral
D.
charged with a type depending upon current strength
Ans:
neutral
Explanation :
0
[12] A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers.
A.
reflection
B.
refraction
C.
diffraction
D.
total internal reflection
Ans:
total internal reflection
Explanation :
If the angle of incidence of light ray in the denser medium is greater than the critical angle of the concerned media pair, the light is not at all reflected in to the rarer medium but is totally reflected. This is known as 'total internal reflection'.
[13] Which of the following physical quantities has no dimension?
A.
Force
B.
Momentum
C.
Impulse
D.
Angle
Ans:
Angle
Explanation :
Quantities having units, but no dimensions: Plane angle, angular displacement, solid angle. These physical quantities possess units but they does not possess dimensional formulas.
[14] Which of the following is a good conductor of heat but bad conductor of electricity?
A.
mica
B.
asbestos
C.
celluloid
D.
paraffin wax
Ans:
mica
Explanation :
Good conductors of heat are good conductors of electricity. Mica is an exception which although being a good conductor of heat and a bad conductor of electricity. It is commonly used in insulation of electricity between high heat generating transistors and their heat sink and or chassis to prevent grounding out of component and to assist in the transfer of the generated heat to the heat sink or chassis for dissipation.
[15] Respiration in the absence of air is called -
A.
Aerobic respiration
B.
Anaerobic respiration
C.
Muscular respiration
D.
Molecular respiration
Ans:
Anaerobic respiration
Explanation :
Respiration in the absence of air is called Anaerobic respiration while respiration in the presence of air (oxygen) is called aerobic respiration.
[16] Which one among the following is responsible for formation of "Ozone Holes" in the atmosphere?
A.
Benzopyrene
B.
Hydrocarbons
C.
Chlorofluorocarbons
D.
UV radiation
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon (CFCs), commonly known by the DuPont brand name Freon, are considered as one of the ozone-depleting substances.
[17] An alloy is an example of :
A.
Colloidal solution
B.
Emulsion
C.
Solid solution
D.
Heterogeneous mixture
Ans:
Solid solution
Explanation :
A Solid solution is a uniform mixture of substances in solid form.
[18] Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be -
A.
2
B.
6
C.
5
D.
3
Ans:
6
Explanation :
Number of spectral lines from a state n to ground state is = n (n-1)/2 =4(4-1)/2 6 6
[19] The resistance of a conductor is inversely proportional to its -
A.
temperature
B.
resistivity
C.
area of cross section
D.
length
Ans:
area of cross section
Explanation :
The resistance of a current carrying conductor is inversely proportional to the area of cross section of the conductor. This is because the resistance occurs due to the collision of electrons/charged particles.
[20] is the perpendicular distance between point of application of force and axis of rotation.
A.
Moment arm
B.
Moment of Inertia
C.
Altitude
D.
Base
Ans:
Moment arm
Explanation :
The magnitude of the moment of force acting about a point or axis is directly proportional to the distance of the force from the point or axis.
[21] 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.
[22] For which one of the following, ‘Diodes' are generally used for?
A.
Rectification
B.
Amplification
C.
Modulation
D.
Filtration
Ans:
Rectification
Explanation :
A rectifier diode is a two-lead semiconductor that allows current to pass in only one direction. Many types of diodes are used for a wide range of applications. Rectifier diodes are a vital component in power supplies
[23] An object is placed on the principal axis of a convex lens of focal length 10 cm. If the distance of the object from the lens is 30 cm, what is the distance of the image formed?
A.
20 cm
B.
15 cm
C.
30 cm
D.
10 cm
Ans:
15 cm
Explanation :
0
[24] A moving neutron collides with a stationary α-particle. The fraction of the kinetic energy lost by the neutron is –
A.
¼
B.
1/16
C.
9/25
D.
16/25
Ans:
16/25
Explanation :
0
[25] Which of these waves can be polarized?
A.
Sound waves in air
B.
Longitudinal waves on a string
C.
Transverse waves on a string
D.
Light waves
Ans:
Light waves
Explanation :
It is possible to transform unpolarized light into polarized light. A light wave that is vibrating in more than one plane is referred to as unpolarized light. Polarized light waves are light waves in which the vibrations occur in a single plane.
Explanation :
This is because temperatures in the home can be much different than the temperature outside. This is because of that important relationship between temperature and how much maximum moisture can be in the air.
[8] The device used to change the speed of an electric fan is -
A.
Amplifier
B.
Regulator
C.
Switclh
D.
Rectifier
Ans:
Regulator
Explanation :
Regulator is to adjust the voltage across the motor of the fan.
[9] The required DC voltage for arc welding is-
A.
6 to 9 V
B.
50 to 60 V
C.
200 to 250 V
D.
90 to 100 V
Ans:
200 to 250 V
Explanation :
0
[10] What is the base of the Octal Numeral System?
A.
8
B.
16
C.
32
D.
64
Ans:
8
Explanation :
The octal numeral system is the base-8 number system and uses the digits 0 to 7. As it uses only eight digits (0 through 7) there are no numbers or letters used above 8.
[11] A wire carrying current is –
A.
positively charged
B.
negatively charged
C.
neutral
D.
charged with a type depending upon current strength
Ans:
neutral
Explanation :
0
[12] A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers.
A.
reflection
B.
refraction
C.
diffraction
D.
total internal reflection
Ans:
total internal reflection
Explanation :
If the angle of incidence of light ray in the denser medium is greater than the critical angle of the concerned media pair, the light is not at all reflected in to the rarer medium but is totally reflected. This is known as 'total internal reflection'.
[13] Which of the following physical quantities has no dimension?
A.
Force
B.
Momentum
C.
Impulse
D.
Angle
Ans:
Angle
Explanation :
Quantities having units, but no dimensions: Plane angle, angular displacement, solid angle. These physical quantities possess units but they does not possess dimensional formulas.
[14] Which of the following is a good conductor of heat but bad conductor of electricity?
A.
mica
B.
asbestos
C.
celluloid
D.
paraffin wax
Ans:
mica
Explanation :
Good conductors of heat are good conductors of electricity. Mica is an exception which although being a good conductor of heat and a bad conductor of electricity. It is commonly used in insulation of electricity between high heat generating transistors and their heat sink and or chassis to prevent grounding out of component and to assist in the transfer of the generated heat to the heat sink or chassis for dissipation.
[15] Respiration in the absence of air is called -
A.
Aerobic respiration
B.
Anaerobic respiration
C.
Muscular respiration
D.
Molecular respiration
Ans:
Anaerobic respiration
Explanation :
Respiration in the absence of air is called Anaerobic respiration while respiration in the presence of air (oxygen) is called aerobic respiration.
[16] Which one among the following is responsible for formation of "Ozone Holes" in the atmosphere?
A.
Benzopyrene
B.
Hydrocarbons
C.
Chlorofluorocarbons
D.
UV radiation
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon (CFCs), commonly known by the DuPont brand name Freon, are considered as one of the ozone-depleting substances.
[17] An alloy is an example of :
A.
Colloidal solution
B.
Emulsion
C.
Solid solution
D.
Heterogeneous mixture
Ans:
Solid solution
Explanation :
A Solid solution is a uniform mixture of substances in solid form.
[18] Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be -
A.
2
B.
6
C.
5
D.
3
Ans:
6
Explanation :
Number of spectral lines from a state n to ground state is = n (n-1)/2 =4(4-1)/2 6 6
[19] The resistance of a conductor is inversely proportional to its -
A.
temperature
B.
resistivity
C.
area of cross section
D.
length
Ans:
area of cross section
Explanation :
The resistance of a current carrying conductor is inversely proportional to the area of cross section of the conductor. This is because the resistance occurs due to the collision of electrons/charged particles.
[20] is the perpendicular distance between point of application of force and axis of rotation.
A.
Moment arm
B.
Moment of Inertia
C.
Altitude
D.
Base
Ans:
Moment arm
Explanation :
The magnitude of the moment of force acting about a point or axis is directly proportional to the distance of the force from the point or axis.
[21] 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.
[22] For which one of the following, ‘Diodes' are generally used for?
A.
Rectification
B.
Amplification
C.
Modulation
D.
Filtration
Ans:
Rectification
Explanation :
A rectifier diode is a two-lead semiconductor that allows current to pass in only one direction. Many types of diodes are used for a wide range of applications. Rectifier diodes are a vital component in power supplies
[23] An object is placed on the principal axis of a convex lens of focal length 10 cm. If the distance of the object from the lens is 30 cm, what is the distance of the image formed?
A.
20 cm
B.
15 cm
C.
30 cm
D.
10 cm
Ans:
15 cm
Explanation :
0
[24] A moving neutron collides with a stationary α-particle. The fraction of the kinetic energy lost by the neutron is –
A.
¼
B.
1/16
C.
9/25
D.
16/25
Ans:
16/25
Explanation :
0
[25] Which of these waves can be polarized?
A.
Sound waves in air
B.
Longitudinal waves on a string
C.
Transverse waves on a string
D.
Light waves
Ans:
Light waves
Explanation :
It is possible to transform unpolarized light into polarized light. A light wave that is vibrating in more than one plane is referred to as unpolarized light. Polarized light waves are light waves in which the vibrations occur in a single plane.
Explanation :
0
[10] What is the base of the Octal Numeral System?
A.
8
B.
16
C.
32
D.
64
Ans:
8
Explanation :
The octal numeral system is the base-8 number system and uses the digits 0 to 7. As it uses only eight digits (0 through 7) there are no numbers or letters used above 8.
[11] A wire carrying current is –
A.
positively charged
B.
negatively charged
C.
neutral
D.
charged with a type depending upon current strength
Ans:
neutral
Explanation :
0
[12] A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers.
A.
reflection
B.
refraction
C.
diffraction
D.
total internal reflection
Ans:
total internal reflection
Explanation :
If the angle of incidence of light ray in the denser medium is greater than the critical angle of the concerned media pair, the light is not at all reflected in to the rarer medium but is totally reflected. This is known as 'total internal reflection'.
[13] Which of the following physical quantities has no dimension?
A.
Force
B.
Momentum
C.
Impulse
D.
Angle
Ans:
Angle
Explanation :
Quantities having units, but no dimensions: Plane angle, angular displacement, solid angle. These physical quantities possess units but they does not possess dimensional formulas.
[14] Which of the following is a good conductor of heat but bad conductor of electricity?
A.
mica
B.
asbestos
C.
celluloid
D.
paraffin wax
Ans:
mica
Explanation :
Good conductors of heat are good conductors of electricity. Mica is an exception which although being a good conductor of heat and a bad conductor of electricity. It is commonly used in insulation of electricity between high heat generating transistors and their heat sink and or chassis to prevent grounding out of component and to assist in the transfer of the generated heat to the heat sink or chassis for dissipation.
[15] Respiration in the absence of air is called -
A.
Aerobic respiration
B.
Anaerobic respiration
C.
Muscular respiration
D.
Molecular respiration
Ans:
Anaerobic respiration
Explanation :
Respiration in the absence of air is called Anaerobic respiration while respiration in the presence of air (oxygen) is called aerobic respiration.
[16] Which one among the following is responsible for formation of "Ozone Holes" in the atmosphere?
A.
Benzopyrene
B.
Hydrocarbons
C.
Chlorofluorocarbons
D.
UV radiation
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon (CFCs), commonly known by the DuPont brand name Freon, are considered as one of the ozone-depleting substances.
[17] An alloy is an example of :
A.
Colloidal solution
B.
Emulsion
C.
Solid solution
D.
Heterogeneous mixture
Ans:
Solid solution
Explanation :
A Solid solution is a uniform mixture of substances in solid form.
[18] Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be -
A.
2
B.
6
C.
5
D.
3
Ans:
6
Explanation :
Number of spectral lines from a state n to ground state is = n (n-1)/2 =4(4-1)/2 6 6
[19] The resistance of a conductor is inversely proportional to its -
A.
temperature
B.
resistivity
C.
area of cross section
D.
length
Ans:
area of cross section
Explanation :
The resistance of a current carrying conductor is inversely proportional to the area of cross section of the conductor. This is because the resistance occurs due to the collision of electrons/charged particles.
[20] is the perpendicular distance between point of application of force and axis of rotation.
A.
Moment arm
B.
Moment of Inertia
C.
Altitude
D.
Base
Ans:
Moment arm
Explanation :
The magnitude of the moment of force acting about a point or axis is directly proportional to the distance of the force from the point or axis.
[21] 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.
[22] For which one of the following, ‘Diodes' are generally used for?
A.
Rectification
B.
Amplification
C.
Modulation
D.
Filtration
Ans:
Rectification
Explanation :
A rectifier diode is a two-lead semiconductor that allows current to pass in only one direction. Many types of diodes are used for a wide range of applications. Rectifier diodes are a vital component in power supplies
[23] An object is placed on the principal axis of a convex lens of focal length 10 cm. If the distance of the object from the lens is 30 cm, what is the distance of the image formed?
A.
20 cm
B.
15 cm
C.
30 cm
D.
10 cm
Ans:
15 cm
Explanation :
0
[24] A moving neutron collides with a stationary α-particle. The fraction of the kinetic energy lost by the neutron is –
A.
¼
B.
1/16
C.
9/25
D.
16/25
Ans:
16/25
Explanation :
0
[25] Which of these waves can be polarized?
A.
Sound waves in air
B.
Longitudinal waves on a string
C.
Transverse waves on a string
D.
Light waves
Ans:
Light waves
Explanation :
It is possible to transform unpolarized light into polarized light. A light wave that is vibrating in more than one plane is referred to as unpolarized light. Polarized light waves are light waves in which the vibrations occur in a single plane.
Explanation :
0
[12] A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers.
A.
reflection
B.
refraction
C.
diffraction
D.
total internal reflection
Ans:
total internal reflection
Explanation :
If the angle of incidence of light ray in the denser medium is greater than the critical angle of the concerned media pair, the light is not at all reflected in to the rarer medium but is totally reflected. This is known as 'total internal reflection'.
[13] Which of the following physical quantities has no dimension?
A.
Force
B.
Momentum
C.
Impulse
D.
Angle
Ans:
Angle
Explanation :
Quantities having units, but no dimensions: Plane angle, angular displacement, solid angle. These physical quantities possess units but they does not possess dimensional formulas.
[14] Which of the following is a good conductor of heat but bad conductor of electricity?
A.
mica
B.
asbestos
C.
celluloid
D.
paraffin wax
Ans:
mica
Explanation :
Good conductors of heat are good conductors of electricity. Mica is an exception which although being a good conductor of heat and a bad conductor of electricity. It is commonly used in insulation of electricity between high heat generating transistors and their heat sink and or chassis to prevent grounding out of component and to assist in the transfer of the generated heat to the heat sink or chassis for dissipation.
[15] Respiration in the absence of air is called -
A.
Aerobic respiration
B.
Anaerobic respiration
C.
Muscular respiration
D.
Molecular respiration
Ans:
Anaerobic respiration
Explanation :
Respiration in the absence of air is called Anaerobic respiration while respiration in the presence of air (oxygen) is called aerobic respiration.
[16] Which one among the following is responsible for formation of "Ozone Holes" in the atmosphere?
A.
Benzopyrene
B.
Hydrocarbons
C.
Chlorofluorocarbons
D.
UV radiation
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon (CFCs), commonly known by the DuPont brand name Freon, are considered as one of the ozone-depleting substances.
[17] An alloy is an example of :
A.
Colloidal solution
B.
Emulsion
C.
Solid solution
D.
Heterogeneous mixture
Ans:
Solid solution
Explanation :
A Solid solution is a uniform mixture of substances in solid form.
[18] Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be -
A.
2
B.
6
C.
5
D.
3
Ans:
6
Explanation :
Number of spectral lines from a state n to ground state is = n (n-1)/2 =4(4-1)/2 6 6
[19] The resistance of a conductor is inversely proportional to its -
A.
temperature
B.
resistivity
C.
area of cross section
D.
length
Ans:
area of cross section
Explanation :
The resistance of a current carrying conductor is inversely proportional to the area of cross section of the conductor. This is because the resistance occurs due to the collision of electrons/charged particles.
[20] is the perpendicular distance between point of application of force and axis of rotation.
A.
Moment arm
B.
Moment of Inertia
C.
Altitude
D.
Base
Ans:
Moment arm
Explanation :
The magnitude of the moment of force acting about a point or axis is directly proportional to the distance of the force from the point or axis.
[21] 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.
[22] For which one of the following, ‘Diodes' are generally used for?
A.
Rectification
B.
Amplification
C.
Modulation
D.
Filtration
Ans:
Rectification
Explanation :
A rectifier diode is a two-lead semiconductor that allows current to pass in only one direction. Many types of diodes are used for a wide range of applications. Rectifier diodes are a vital component in power supplies
[23] An object is placed on the principal axis of a convex lens of focal length 10 cm. If the distance of the object from the lens is 30 cm, what is the distance of the image formed?
A.
20 cm
B.
15 cm
C.
30 cm
D.
10 cm
Ans:
15 cm
Explanation :
0
[24] A moving neutron collides with a stationary α-particle. The fraction of the kinetic energy lost by the neutron is –
A.
¼
B.
1/16
C.
9/25
D.
16/25
Ans:
16/25
Explanation :
0
[25] Which of these waves can be polarized?
A.
Sound waves in air
B.
Longitudinal waves on a string
C.
Transverse waves on a string
D.
Light waves
Ans:
Light waves
Explanation :
It is possible to transform unpolarized light into polarized light. A light wave that is vibrating in more than one plane is referred to as unpolarized light. Polarized light waves are light waves in which the vibrations occur in a single plane.
Explanation :
Quantities having units, but no dimensions: Plane angle, angular displacement, solid angle. These physical quantities possess units but they does not possess dimensional formulas.
[14] Which of the following is a good conductor of heat but bad conductor of electricity?
A.
mica
B.
asbestos
C.
celluloid
D.
paraffin wax
Ans:
mica
Explanation :
Good conductors of heat are good conductors of electricity. Mica is an exception which although being a good conductor of heat and a bad conductor of electricity. It is commonly used in insulation of electricity between high heat generating transistors and their heat sink and or chassis to prevent grounding out of component and to assist in the transfer of the generated heat to the heat sink or chassis for dissipation.
[15] Respiration in the absence of air is called -
A.
Aerobic respiration
B.
Anaerobic respiration
C.
Muscular respiration
D.
Molecular respiration
Ans:
Anaerobic respiration
Explanation :
Respiration in the absence of air is called Anaerobic respiration while respiration in the presence of air (oxygen) is called aerobic respiration.
[16] Which one among the following is responsible for formation of "Ozone Holes" in the atmosphere?
A.
Benzopyrene
B.
Hydrocarbons
C.
Chlorofluorocarbons
D.
UV radiation
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon (CFCs), commonly known by the DuPont brand name Freon, are considered as one of the ozone-depleting substances.
[17] An alloy is an example of :
A.
Colloidal solution
B.
Emulsion
C.
Solid solution
D.
Heterogeneous mixture
Ans:
Solid solution
Explanation :
A Solid solution is a uniform mixture of substances in solid form.
[18] Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be -
A.
2
B.
6
C.
5
D.
3
Ans:
6
Explanation :
Number of spectral lines from a state n to ground state is = n (n-1)/2 =4(4-1)/2 6 6
[19] The resistance of a conductor is inversely proportional to its -
A.
temperature
B.
resistivity
C.
area of cross section
D.
length
Ans:
area of cross section
Explanation :
The resistance of a current carrying conductor is inversely proportional to the area of cross section of the conductor. This is because the resistance occurs due to the collision of electrons/charged particles.
[20] is the perpendicular distance between point of application of force and axis of rotation.
A.
Moment arm
B.
Moment of Inertia
C.
Altitude
D.
Base
Ans:
Moment arm
Explanation :
The magnitude of the moment of force acting about a point or axis is directly proportional to the distance of the force from the point or axis.
[21] 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.
[22] For which one of the following, ‘Diodes' are generally used for?
A.
Rectification
B.
Amplification
C.
Modulation
D.
Filtration
Ans:
Rectification
Explanation :
A rectifier diode is a two-lead semiconductor that allows current to pass in only one direction. Many types of diodes are used for a wide range of applications. Rectifier diodes are a vital component in power supplies
[23] An object is placed on the principal axis of a convex lens of focal length 10 cm. If the distance of the object from the lens is 30 cm, what is the distance of the image formed?
A.
20 cm
B.
15 cm
C.
30 cm
D.
10 cm
Ans:
15 cm
Explanation :
0
[24] A moving neutron collides with a stationary α-particle. The fraction of the kinetic energy lost by the neutron is –
A.
¼
B.
1/16
C.
9/25
D.
16/25
Ans:
16/25
Explanation :
0
[25] Which of these waves can be polarized?
A.
Sound waves in air
B.
Longitudinal waves on a string
C.
Transverse waves on a string
D.
Light waves
Ans:
Light waves
Explanation :
It is possible to transform unpolarized light into polarized light. A light wave that is vibrating in more than one plane is referred to as unpolarized light. Polarized light waves are light waves in which the vibrations occur in a single plane.
Explanation :
Respiration in the absence of air is called Anaerobic respiration while respiration in the presence of air (oxygen) is called aerobic respiration.
[16] Which one among the following is responsible for formation of "Ozone Holes" in the atmosphere?
A.
Benzopyrene
B.
Hydrocarbons
C.
Chlorofluorocarbons
D.
UV radiation
Ans:
Chlorofluorocarbons
Explanation :
Chlorofluorocarbon (CFCs), commonly known by the DuPont brand name Freon, are considered as one of the ozone-depleting substances.
[17] An alloy is an example of :
A.
Colloidal solution
B.
Emulsion
C.
Solid solution
D.
Heterogeneous mixture
Ans:
Solid solution
Explanation :
A Solid solution is a uniform mixture of substances in solid form.
[18] Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be -
A.
2
B.
6
C.
5
D.
3
Ans:
6
Explanation :
Number of spectral lines from a state n to ground state is = n (n-1)/2 =4(4-1)/2 6 6
[19] The resistance of a conductor is inversely proportional to its -
A.
temperature
B.
resistivity
C.
area of cross section
D.
length
Ans:
area of cross section
Explanation :
The resistance of a current carrying conductor is inversely proportional to the area of cross section of the conductor. This is because the resistance occurs due to the collision of electrons/charged particles.
[20] is the perpendicular distance between point of application of force and axis of rotation.
A.
Moment arm
B.
Moment of Inertia
C.
Altitude
D.
Base
Ans:
Moment arm
Explanation :
The magnitude of the moment of force acting about a point or axis is directly proportional to the distance of the force from the point or axis.
[21] 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.
[22] For which one of the following, ‘Diodes' are generally used for?
A.
Rectification
B.
Amplification
C.
Modulation
D.
Filtration
Ans:
Rectification
Explanation :
A rectifier diode is a two-lead semiconductor that allows current to pass in only one direction. Many types of diodes are used for a wide range of applications. Rectifier diodes are a vital component in power supplies
[23] An object is placed on the principal axis of a convex lens of focal length 10 cm. If the distance of the object from the lens is 30 cm, what is the distance of the image formed?
A.
20 cm
B.
15 cm
C.
30 cm
D.
10 cm
Ans:
15 cm
Explanation :
0
[24] A moving neutron collides with a stationary α-particle. The fraction of the kinetic energy lost by the neutron is –
A.
¼
B.
1/16
C.
9/25
D.
16/25
Ans:
16/25
Explanation :
0
[25] Which of these waves can be polarized?
A.
Sound waves in air
B.
Longitudinal waves on a string
C.
Transverse waves on a string
D.
Light waves
Ans:
Light waves
Explanation :
It is possible to transform unpolarized light into polarized light. A light wave that is vibrating in more than one plane is referred to as unpolarized light. Polarized light waves are light waves in which the vibrations occur in a single plane.
Explanation :
A Solid solution is a uniform mixture of substances in solid form.
[18] Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be -
A.
2
B.
6
C.
5
D.
3
Ans:
6
Explanation :
Number of spectral lines from a state n to ground state is = n (n-1)/2 =4(4-1)/2 6 6
[19] The resistance of a conductor is inversely proportional to its -
A.
temperature
B.
resistivity
C.
area of cross section
D.
length
Ans:
area of cross section
Explanation :
The resistance of a current carrying conductor is inversely proportional to the area of cross section of the conductor. This is because the resistance occurs due to the collision of electrons/charged particles.
[20] is the perpendicular distance between point of application of force and axis of rotation.
A.
Moment arm
B.
Moment of Inertia
C.
Altitude
D.
Base
Ans:
Moment arm
Explanation :
The magnitude of the moment of force acting about a point or axis is directly proportional to the distance of the force from the point or axis.
[21] 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.
[22] For which one of the following, ‘Diodes' are generally used for?
A.
Rectification
B.
Amplification
C.
Modulation
D.
Filtration
Ans:
Rectification
Explanation :
A rectifier diode is a two-lead semiconductor that allows current to pass in only one direction. Many types of diodes are used for a wide range of applications. Rectifier diodes are a vital component in power supplies
[23] An object is placed on the principal axis of a convex lens of focal length 10 cm. If the distance of the object from the lens is 30 cm, what is the distance of the image formed?
A.
20 cm
B.
15 cm
C.
30 cm
D.
10 cm
Ans:
15 cm
Explanation :
0
[24] A moving neutron collides with a stationary α-particle. The fraction of the kinetic energy lost by the neutron is –
A.
¼
B.
1/16
C.
9/25
D.
16/25
Ans:
16/25
Explanation :
0
[25] Which of these waves can be polarized?
A.
Sound waves in air
B.
Longitudinal waves on a string
C.
Transverse waves on a string
D.
Light waves
Ans:
Light waves
Explanation :
It is possible to transform unpolarized light into polarized light. A light wave that is vibrating in more than one plane is referred to as unpolarized light. Polarized light waves are light waves in which the vibrations occur in a single plane.
Explanation :
The resistance of a current carrying conductor is inversely proportional to the area of cross section of the conductor. This is because the resistance occurs due to the collision of electrons/charged particles.
[20] is the perpendicular distance between point of application of force and axis of rotation.
A.
Moment arm
B.
Moment of Inertia
C.
Altitude
D.
Base
Ans:
Moment arm
Explanation :
The magnitude of the moment of force acting about a point or axis is directly proportional to the distance of the force from the point or axis.
[21] 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.
[22] For which one of the following, ‘Diodes' are generally used for?
A.
Rectification
B.
Amplification
C.
Modulation
D.
Filtration
Ans:
Rectification
Explanation :
A rectifier diode is a two-lead semiconductor that allows current to pass in only one direction. Many types of diodes are used for a wide range of applications. Rectifier diodes are a vital component in power supplies
[23] An object is placed on the principal axis of a convex lens of focal length 10 cm. If the distance of the object from the lens is 30 cm, what is the distance of the image formed?
A.
20 cm
B.
15 cm
C.
30 cm
D.
10 cm
Ans:
15 cm
Explanation :
0
[24] A moving neutron collides with a stationary α-particle. The fraction of the kinetic energy lost by the neutron is –
A.
¼
B.
1/16
C.
9/25
D.
16/25
Ans:
16/25
Explanation :
0
[25] Which of these waves can be polarized?
A.
Sound waves in air
B.
Longitudinal waves on a string
C.
Transverse waves on a string
D.
Light waves
Ans:
Light waves
Explanation :
It is possible to transform unpolarized light into polarized light. A light wave that is vibrating in more than one plane is referred to as unpolarized light. Polarized light waves are light waves in which the vibrations occur in a single plane.
Explanation :
The rotational effect of a force on a body about an axis of rotation is described in terms of the Moment of force.
[22] For which one of the following, ‘Diodes' are generally used for?
A.
Rectification
B.
Amplification
C.
Modulation
D.
Filtration
Ans:
Rectification
Explanation :
A rectifier diode is a two-lead semiconductor that allows current to pass in only one direction. Many types of diodes are used for a wide range of applications. Rectifier diodes are a vital component in power supplies
[23] An object is placed on the principal axis of a convex lens of focal length 10 cm. If the distance of the object from the lens is 30 cm, what is the distance of the image formed?
A.
20 cm
B.
15 cm
C.
30 cm
D.
10 cm
Ans:
15 cm
Explanation :
0
[24] A moving neutron collides with a stationary α-particle. The fraction of the kinetic energy lost by the neutron is –
A.
¼
B.
1/16
C.
9/25
D.
16/25
Ans:
16/25
Explanation :
0
[25] Which of these waves can be polarized?
A.
Sound waves in air
B.
Longitudinal waves on a string
C.
Transverse waves on a string
D.
Light waves
Ans:
Light waves
Explanation :
It is possible to transform unpolarized light into polarized light. A light wave that is vibrating in more than one plane is referred to as unpolarized light. Polarized light waves are light waves in which the vibrations occur in a single plane.
Explanation :
0
[24] A moving neutron collides with a stationary α-particle. The fraction of the kinetic energy lost by the neutron is –
A.
¼
B.
1/16
C.
9/25
D.
16/25
Ans:
16/25
Explanation :
0
[25] Which of these waves can be polarized?
A.
Sound waves in air
B.
Longitudinal waves on a string
C.
Transverse waves on a string
D.
Light waves
Ans:
Light waves
Explanation :
It is possible to transform unpolarized light into polarized light. A light wave that is vibrating in more than one plane is referred to as unpolarized light. Polarized light waves are light waves in which the vibrations occur in a single plane.
Explanation :
It is possible to transform unpolarized light into polarized light. A light wave that is vibrating in more than one plane is referred to as unpolarized light. Polarized light waves are light waves in which the vibrations occur in a single plane.