[1] Who measured the velocity of light first?
A.
Galileo
B.
Newton
C.
Romer
D.
Einstein
Ans:
Romer
Explanation :
Galileo is often credited with being the first scientist to try to determine the speed of light. Galileo’s experiment was carried out by the Accademia del Cimento of Florence, Italy, in 1667, with the lanterns separated by about one mile, but no delay was observed. The actual delay in this experiment would have been about 11 microseconds. The first quantitative estimate of the speed of light was made in 1676 by Romer. From the observation that the periods of Jupiter’s innermost moon Io appeared to be shorter when the Earth was approaching Jupiter than when receding from it, he concluded that light travels at a finite speed, and estimated that it takes light 22 minutes to cross the diameter of Earth’s orbit.
[2] Heat from the sun reaches earth by the process of –
A.
Conduction
B.
Convection
C.
Radiation
D.
All of the above
Ans:
Radiation
Explanation :
In physics, radiation is a process in which energetic particles or energetic waves travel through vacuum, or through matter-containing media that are not required for their propagation. Waves of a massive medium itself, such as water waves or sound waves, are usually not considered to be forms of “radiation” in this sense. By contrast, gravitational waves, which are waves of space-time itself, qualify as a type of radiation. Heat from the sun also reaches earth by the process of radiation.
[3] Boyle's law is a relationship between –
A.
Pressure and volume
B.
Volume and temperature
C.
Volume and density
D.
Pressure and temperature
Ans:
Pressure and volume
Explanation :
Boyle's law states that the absolute pressure and volume of a given mass of confined gas are inversely proportional, if the temperature remains unchanged within a closed system. Thus, it states that the product of pressure and volume is a constant for a given mass of confined has as long as the temperature is constant. The law was named after chemist and physicist Robert Boyle, who published the original law in 1662.
[4] Flemings right hand rule is used to find the direction of the –
A.
Alternate current
B.
Direct current
C.
Induced current
D.
Actual current
Ans:
Induced current
Explanation :
Fleming's right hand rule shows the direction of induced current when a conductor moves in a magnetic field. The right hand is held with the thumb, first finger and second finger mutually perpendicular to each other. The rule is named after British engineer John Ambrose Fleming.
[5] What is the full form of 'AM' regarding radio broadcasting?
A.
Amplitude Movement
B.
Anywhere Movement
C.
Amplitude Matching
D.
Amplitude Modulation
Ans:
Amplitude Modulation
Explanation :
AM broadcasting is the process of radio broadcasting using amplitude modulation. AM was the first method of impressing sound on a radio signal and is still widely used today. An AM receiver detects amplitude variations in the radio waves at a particular frequency. It then amplifies changes in the signal voltage to drive a loudspeaker or earphones.
[6] Bar is a unit of which one of the following?
A.
Force
B.
Energy
C.
Pressure
D.
Frequency
Ans:
Pressure
Explanation :
The bar is a unit of pressure defined as 100 kilopascals. It is about equal to the atmospheric pressure on Earth at sea level.
[7] Bolometer is used to measure –
A.
Frequency
B.
Temperature
C.
Velocity
D.
Wavelength
Ans:
Temperature
Explanation :
A bolometer is a device for measuring the power of incident electromagnetic radiation via the heating of a material with a temperature-dependent electrical resistance. IL was invented in 1878 by the American astronomer Samuel Pierpont Langley. A bolometer consists of an absorptive element, such as a thin layer of metal, connected to a thermal reservoir (a body of constant temperature) through a thermal link.
[8] Supersonic plane fly with the speed -
A.
less than the speed of sound
B.
of sound
C.
greater than the speed of sound
D.
of light
Ans:
greater than the speed of sound
Explanation :
Supersonic travel is a rate of travel of an object that exceeds the speed of sound (Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level, this speed is approximately 344 m/s, 1,125 ft/s, 768 mph, 667 knots, or 1,235 km/h.
[9] If input frequency of a full wave rectifier be n, then output frequency would be -
A.
n/2
B.
n
C.
3n/2
D.
2n
Ans:
2n
Explanation :
The frequency of a full-wave rectifier is double that of the input, if the input is a sine wave. A fullwave rectifier converts the whole of the input waveform to one of constant polarity (positive or negative) at its output. Full-wave rectification converts both polarities of the input waveform to DC (direct current), and yields a higher mean output voltage. Two diodes and a centre tapped transformer, or four diodes in a bridge configuration and any AC source (including a transformer without center tap), are needed. Single semiconductor diodes, double diodes with common cathode or common anode, and four diode bridges, are manufactured as single components.
[10] Heat transfer horizontally within the atmosphere is called –
A.
Conduction
B.
Convection
C.
Absorption
D.
Advection
Ans:
Advection
Explanation :
Convection transfers heat vertically into the atmosphere. In order for heat to be transferred to other regions, it must be transferred horizontally by the wind. The horizontal transfer of heat by the wind is called advection. Advection is a transport mechanism of a substance or conserved property by a fluid due to the fluid's bulk motion. An example of advection is the transport of pollutants or silt in a river by bulk water flow downstream.
[11] The phenomenon of light associated with the appearance of blue colour of the sky is –
A.
Interference
B.
Reflection
C.
Refraction
D.
Scattering
Ans:
Scattering
Explanation :
During daylight, the sky appears to be blue because air scatters blue sunlight more than it scatters red. At night, the sky appears to be a mostly dark surface or region scattered with stars. Except for light that comes directly from the sun, most of the light in the day sky is a result of scattering, which is dominated by a small-particle limit called Rayleigh scattering.
[12] Air coolers are more suitable for –
A.
hot and humid climate
B.
hot and dry climate
C.
cool and humid climate
D.
cool and dry climate
Ans:
hot and dry climate
Explanation :
An air cooler works on the simple principle of evaporation. It does not yield good results when humidity is high. On the contrary, the temperature of dry air can be dropped significantly through the phase transition of liquid water to water vapor (evaporation), which can cool air using much less energy than refrigeration.
[13] Who enunciated the laws of planetary motion?
A.
Nicolaus Copernicus
B.
Johannes Kepler
C.
Isaac Newton
D.
Galileo
Ans:
Johannes Kepler
Explanation :
Kepler's laws of planetary motion are three scientific laws describing orbital motion, each giving a description of the motion of planets around the Sun. The laws are: the orbit of every planet is an ellipse with the Sun at one of the two foci; a line joining a planet and the Sun sweeps out equal areas during equal intervals of time; and the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
[14] The radiant energy having lowest energy is –
A.
gamma rays
B.
UV rays
C.
visible light
D.
microwave radiation
Ans:
microwave radiation
Explanation :
The parts of the electromagnetic spectrum, arranged from highest energy to lowest, are gamma rays, X- rays, Ultraviolet light, visible light, infrared light, microwaves, and radio waves.
[15] When water is heated from 0°C to 10°C. Its volume :
A.
increases
B.
decreases
C.
does not change
D.
first decreases and then increases
Ans:
first decreases and then increases
Explanation :
When water is heated from 0 degree Celsius to 10 degree Celsius, its volume first decreases and then increases. Give reason. When water is heated from 00C, its volume decreases because its density increases and you can see this effect upto 40C.
[16] A force may change of an object.
A.
speed
B.
direction
C.
shape
D.
All options are correct
Ans:
All options are correct
Explanation :
[17] Natural radioactivity was discovered by -
A.
Marie Curie
B.
Ernest Rutherfor
C.
Henri Becquerel
D.
Enrico Fermi
Ans:
Henri Becquerel
Explanation :
The Discovery of Radioactivity. In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[18] A circular plate, a cube and a sphere, all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?
A.
Circular plate
B.
Cube
C.
Sphere
D.
All will cool at the same rate
Ans:
Sphere
Explanation :
In the late of 17th century British scientist Isaac Newton studied cooling of bodies. Experiments showed that the cooling rate is approximately proportional to the difference of temperatures between the heated body and the environment.
[19] The 'Abolition of Titles' is a fundamental right classified under:
A.
Right against Exploitation
B.
Right to Freedom
C.
Right to equality
D.
Right to freedom of religion
Ans:
Right to equality
Explanation :
The right to equality includes equality before law, prohibition of discrimination on grounds of religion, race, caste, gender or place of birth, and equality of opportunity in matters of employment, abolition of untouchability and abolition of titles.
[20] A player making a long jump is an example of .
A.
Projectile motion
B.
Rotatory motion
C.
Spinning motion
D.
Horizontal motion
Ans:
Projectile motion
Explanation :
Projectile motion is a form of motion in which an object or particle is thrown near the earth's surface and it moves along a curved path under the action of gravity only.
[21] Which of the following is arranged in order of decreasing conductivity?
A.
Copper, Aluminium, Steel, Silver
B.
Aluminium, Silver, Copper, Steel
C.
Copper, Silver, Aluminium, Steel
D.
Silver, Copper, Aluminium, Steel
Ans:
Silver, Copper, Aluminium, Steel
Explanation :
Copper ; 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[22] Which of the following liquids is most viscous?
A.
Oil
B.
Milk
C.
Water
D.
petrol
Ans:
Oil
Explanation :
Informally, viscosity is the quantity that describes a fluid's resistance to flow. It is dependent on temperature. Viscosity of the different fluids (in cP) is as follows: Edible Oil: 20 to 60; Milk: approximately 1.0; Water: 0.894; and Petrol: around 0.82 to 0.95 cP.
[23] Which one of the following has the highest value of specific heat?
A.
Glass
B.
Copper
C.
Lead
D.
Water
Ans:
Water
Explanation :
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance. As a result, water plays a very important role in temperature regulation. The specific heat per gram for water is much higher than that for a metal.
[24] When hot-water is sprinkled on a hotter glass tumbler, it breaks because –
A.
glass suddenly expands
B.
glass suddenly contracts
C.
water evaporates
D.
glass reacts chemically with water
Ans:
glass suddenly contracts
Explanation :
If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel.
[25] Electricity is transmitted over long distances –
A.
it is fast
B.
there is less wastage of energy
C.
it is safer
D.
it is cheaper
Ans:
there is less wastage of energy
Explanation :
Long distance means higher wastage of energy. So High volt direct-current (HVDC) technology is used for greater efficiency in very long distances. Electricity is transmitted at high voltages (110 kV or above) to reduce the energy lost in long-distance transmission.
Explanation :
Galileo is often credited with being the first scientist to try to determine the speed of light. Galileo’s experiment was carried out by the Accademia del Cimento of Florence, Italy, in 1667, with the lanterns separated by about one mile, but no delay was observed. The actual delay in this experiment would have been about 11 microseconds. The first quantitative estimate of the speed of light was made in 1676 by Romer. From the observation that the periods of Jupiter’s innermost moon Io appeared to be shorter when the Earth was approaching Jupiter than when receding from it, he concluded that light travels at a finite speed, and estimated that it takes light 22 minutes to cross the diameter of Earth’s orbit.
[2] Heat from the sun reaches earth by the process of –
A.
Conduction
B.
Convection
C.
Radiation
D.
All of the above
Ans:
Radiation
Explanation :
In physics, radiation is a process in which energetic particles or energetic waves travel through vacuum, or through matter-containing media that are not required for their propagation. Waves of a massive medium itself, such as water waves or sound waves, are usually not considered to be forms of “radiation” in this sense. By contrast, gravitational waves, which are waves of space-time itself, qualify as a type of radiation. Heat from the sun also reaches earth by the process of radiation.
[3] Boyle's law is a relationship between –
A.
Pressure and volume
B.
Volume and temperature
C.
Volume and density
D.
Pressure and temperature
Ans:
Pressure and volume
Explanation :
Boyle's law states that the absolute pressure and volume of a given mass of confined gas are inversely proportional, if the temperature remains unchanged within a closed system. Thus, it states that the product of pressure and volume is a constant for a given mass of confined has as long as the temperature is constant. The law was named after chemist and physicist Robert Boyle, who published the original law in 1662.
[4] Flemings right hand rule is used to find the direction of the –
A.
Alternate current
B.
Direct current
C.
Induced current
D.
Actual current
Ans:
Induced current
Explanation :
Fleming's right hand rule shows the direction of induced current when a conductor moves in a magnetic field. The right hand is held with the thumb, first finger and second finger mutually perpendicular to each other. The rule is named after British engineer John Ambrose Fleming.
[5] What is the full form of 'AM' regarding radio broadcasting?
A.
Amplitude Movement
B.
Anywhere Movement
C.
Amplitude Matching
D.
Amplitude Modulation
Ans:
Amplitude Modulation
Explanation :
AM broadcasting is the process of radio broadcasting using amplitude modulation. AM was the first method of impressing sound on a radio signal and is still widely used today. An AM receiver detects amplitude variations in the radio waves at a particular frequency. It then amplifies changes in the signal voltage to drive a loudspeaker or earphones.
[6] Bar is a unit of which one of the following?
A.
Force
B.
Energy
C.
Pressure
D.
Frequency
Ans:
Pressure
Explanation :
The bar is a unit of pressure defined as 100 kilopascals. It is about equal to the atmospheric pressure on Earth at sea level.
[7] Bolometer is used to measure –
A.
Frequency
B.
Temperature
C.
Velocity
D.
Wavelength
Ans:
Temperature
Explanation :
A bolometer is a device for measuring the power of incident electromagnetic radiation via the heating of a material with a temperature-dependent electrical resistance. IL was invented in 1878 by the American astronomer Samuel Pierpont Langley. A bolometer consists of an absorptive element, such as a thin layer of metal, connected to a thermal reservoir (a body of constant temperature) through a thermal link.
[8] Supersonic plane fly with the speed -
A.
less than the speed of sound
B.
of sound
C.
greater than the speed of sound
D.
of light
Ans:
greater than the speed of sound
Explanation :
Supersonic travel is a rate of travel of an object that exceeds the speed of sound (Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level, this speed is approximately 344 m/s, 1,125 ft/s, 768 mph, 667 knots, or 1,235 km/h.
[9] If input frequency of a full wave rectifier be n, then output frequency would be -
A.
n/2
B.
n
C.
3n/2
D.
2n
Ans:
2n
Explanation :
The frequency of a full-wave rectifier is double that of the input, if the input is a sine wave. A fullwave rectifier converts the whole of the input waveform to one of constant polarity (positive or negative) at its output. Full-wave rectification converts both polarities of the input waveform to DC (direct current), and yields a higher mean output voltage. Two diodes and a centre tapped transformer, or four diodes in a bridge configuration and any AC source (including a transformer without center tap), are needed. Single semiconductor diodes, double diodes with common cathode or common anode, and four diode bridges, are manufactured as single components.
[10] Heat transfer horizontally within the atmosphere is called –
A.
Conduction
B.
Convection
C.
Absorption
D.
Advection
Ans:
Advection
Explanation :
Convection transfers heat vertically into the atmosphere. In order for heat to be transferred to other regions, it must be transferred horizontally by the wind. The horizontal transfer of heat by the wind is called advection. Advection is a transport mechanism of a substance or conserved property by a fluid due to the fluid's bulk motion. An example of advection is the transport of pollutants or silt in a river by bulk water flow downstream.
[11] The phenomenon of light associated with the appearance of blue colour of the sky is –
A.
Interference
B.
Reflection
C.
Refraction
D.
Scattering
Ans:
Scattering
Explanation :
During daylight, the sky appears to be blue because air scatters blue sunlight more than it scatters red. At night, the sky appears to be a mostly dark surface or region scattered with stars. Except for light that comes directly from the sun, most of the light in the day sky is a result of scattering, which is dominated by a small-particle limit called Rayleigh scattering.
[12] Air coolers are more suitable for –
A.
hot and humid climate
B.
hot and dry climate
C.
cool and humid climate
D.
cool and dry climate
Ans:
hot and dry climate
Explanation :
An air cooler works on the simple principle of evaporation. It does not yield good results when humidity is high. On the contrary, the temperature of dry air can be dropped significantly through the phase transition of liquid water to water vapor (evaporation), which can cool air using much less energy than refrigeration.
[13] Who enunciated the laws of planetary motion?
A.
Nicolaus Copernicus
B.
Johannes Kepler
C.
Isaac Newton
D.
Galileo
Ans:
Johannes Kepler
Explanation :
Kepler's laws of planetary motion are three scientific laws describing orbital motion, each giving a description of the motion of planets around the Sun. The laws are: the orbit of every planet is an ellipse with the Sun at one of the two foci; a line joining a planet and the Sun sweeps out equal areas during equal intervals of time; and the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
[14] The radiant energy having lowest energy is –
A.
gamma rays
B.
UV rays
C.
visible light
D.
microwave radiation
Ans:
microwave radiation
Explanation :
The parts of the electromagnetic spectrum, arranged from highest energy to lowest, are gamma rays, X- rays, Ultraviolet light, visible light, infrared light, microwaves, and radio waves.
[15] When water is heated from 0°C to 10°C. Its volume :
A.
increases
B.
decreases
C.
does not change
D.
first decreases and then increases
Ans:
first decreases and then increases
Explanation :
When water is heated from 0 degree Celsius to 10 degree Celsius, its volume first decreases and then increases. Give reason. When water is heated from 00C, its volume decreases because its density increases and you can see this effect upto 40C.
[16] A force may change of an object.
A.
speed
B.
direction
C.
shape
D.
All options are correct
Ans:
All options are correct
Explanation :
[17] Natural radioactivity was discovered by -
A.
Marie Curie
B.
Ernest Rutherfor
C.
Henri Becquerel
D.
Enrico Fermi
Ans:
Henri Becquerel
Explanation :
The Discovery of Radioactivity. In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[18] A circular plate, a cube and a sphere, all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?
A.
Circular plate
B.
Cube
C.
Sphere
D.
All will cool at the same rate
Ans:
Sphere
Explanation :
In the late of 17th century British scientist Isaac Newton studied cooling of bodies. Experiments showed that the cooling rate is approximately proportional to the difference of temperatures between the heated body and the environment.
[19] The 'Abolition of Titles' is a fundamental right classified under:
A.
Right against Exploitation
B.
Right to Freedom
C.
Right to equality
D.
Right to freedom of religion
Ans:
Right to equality
Explanation :
The right to equality includes equality before law, prohibition of discrimination on grounds of religion, race, caste, gender or place of birth, and equality of opportunity in matters of employment, abolition of untouchability and abolition of titles.
[20] A player making a long jump is an example of .
A.
Projectile motion
B.
Rotatory motion
C.
Spinning motion
D.
Horizontal motion
Ans:
Projectile motion
Explanation :
Projectile motion is a form of motion in which an object or particle is thrown near the earth's surface and it moves along a curved path under the action of gravity only.
[21] Which of the following is arranged in order of decreasing conductivity?
A.
Copper, Aluminium, Steel, Silver
B.
Aluminium, Silver, Copper, Steel
C.
Copper, Silver, Aluminium, Steel
D.
Silver, Copper, Aluminium, Steel
Ans:
Silver, Copper, Aluminium, Steel
Explanation :
Copper ; 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[22] Which of the following liquids is most viscous?
A.
Oil
B.
Milk
C.
Water
D.
petrol
Ans:
Oil
Explanation :
Informally, viscosity is the quantity that describes a fluid's resistance to flow. It is dependent on temperature. Viscosity of the different fluids (in cP) is as follows: Edible Oil: 20 to 60; Milk: approximately 1.0; Water: 0.894; and Petrol: around 0.82 to 0.95 cP.
[23] Which one of the following has the highest value of specific heat?
A.
Glass
B.
Copper
C.
Lead
D.
Water
Ans:
Water
Explanation :
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance. As a result, water plays a very important role in temperature regulation. The specific heat per gram for water is much higher than that for a metal.
[24] When hot-water is sprinkled on a hotter glass tumbler, it breaks because –
A.
glass suddenly expands
B.
glass suddenly contracts
C.
water evaporates
D.
glass reacts chemically with water
Ans:
glass suddenly contracts
Explanation :
If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel.
[25] Electricity is transmitted over long distances –
A.
it is fast
B.
there is less wastage of energy
C.
it is safer
D.
it is cheaper
Ans:
there is less wastage of energy
Explanation :
Long distance means higher wastage of energy. So High volt direct-current (HVDC) technology is used for greater efficiency in very long distances. Electricity is transmitted at high voltages (110 kV or above) to reduce the energy lost in long-distance transmission.
Explanation :
Boyle's law states that the absolute pressure and volume of a given mass of confined gas are inversely proportional, if the temperature remains unchanged within a closed system. Thus, it states that the product of pressure and volume is a constant for a given mass of confined has as long as the temperature is constant. The law was named after chemist and physicist Robert Boyle, who published the original law in 1662.
[4] Flemings right hand rule is used to find the direction of the –
A.
Alternate current
B.
Direct current
C.
Induced current
D.
Actual current
Ans:
Induced current
Explanation :
Fleming's right hand rule shows the direction of induced current when a conductor moves in a magnetic field. The right hand is held with the thumb, first finger and second finger mutually perpendicular to each other. The rule is named after British engineer John Ambrose Fleming.
[5] What is the full form of 'AM' regarding radio broadcasting?
A.
Amplitude Movement
B.
Anywhere Movement
C.
Amplitude Matching
D.
Amplitude Modulation
Ans:
Amplitude Modulation
Explanation :
AM broadcasting is the process of radio broadcasting using amplitude modulation. AM was the first method of impressing sound on a radio signal and is still widely used today. An AM receiver detects amplitude variations in the radio waves at a particular frequency. It then amplifies changes in the signal voltage to drive a loudspeaker or earphones.
[6] Bar is a unit of which one of the following?
A.
Force
B.
Energy
C.
Pressure
D.
Frequency
Ans:
Pressure
Explanation :
The bar is a unit of pressure defined as 100 kilopascals. It is about equal to the atmospheric pressure on Earth at sea level.
[7] Bolometer is used to measure –
A.
Frequency
B.
Temperature
C.
Velocity
D.
Wavelength
Ans:
Temperature
Explanation :
A bolometer is a device for measuring the power of incident electromagnetic radiation via the heating of a material with a temperature-dependent electrical resistance. IL was invented in 1878 by the American astronomer Samuel Pierpont Langley. A bolometer consists of an absorptive element, such as a thin layer of metal, connected to a thermal reservoir (a body of constant temperature) through a thermal link.
[8] Supersonic plane fly with the speed -
A.
less than the speed of sound
B.
of sound
C.
greater than the speed of sound
D.
of light
Ans:
greater than the speed of sound
Explanation :
Supersonic travel is a rate of travel of an object that exceeds the speed of sound (Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level, this speed is approximately 344 m/s, 1,125 ft/s, 768 mph, 667 knots, or 1,235 km/h.
[9] If input frequency of a full wave rectifier be n, then output frequency would be -
A.
n/2
B.
n
C.
3n/2
D.
2n
Ans:
2n
Explanation :
The frequency of a full-wave rectifier is double that of the input, if the input is a sine wave. A fullwave rectifier converts the whole of the input waveform to one of constant polarity (positive or negative) at its output. Full-wave rectification converts both polarities of the input waveform to DC (direct current), and yields a higher mean output voltage. Two diodes and a centre tapped transformer, or four diodes in a bridge configuration and any AC source (including a transformer without center tap), are needed. Single semiconductor diodes, double diodes with common cathode or common anode, and four diode bridges, are manufactured as single components.
[10] Heat transfer horizontally within the atmosphere is called –
A.
Conduction
B.
Convection
C.
Absorption
D.
Advection
Ans:
Advection
Explanation :
Convection transfers heat vertically into the atmosphere. In order for heat to be transferred to other regions, it must be transferred horizontally by the wind. The horizontal transfer of heat by the wind is called advection. Advection is a transport mechanism of a substance or conserved property by a fluid due to the fluid's bulk motion. An example of advection is the transport of pollutants or silt in a river by bulk water flow downstream.
[11] The phenomenon of light associated with the appearance of blue colour of the sky is –
A.
Interference
B.
Reflection
C.
Refraction
D.
Scattering
Ans:
Scattering
Explanation :
During daylight, the sky appears to be blue because air scatters blue sunlight more than it scatters red. At night, the sky appears to be a mostly dark surface or region scattered with stars. Except for light that comes directly from the sun, most of the light in the day sky is a result of scattering, which is dominated by a small-particle limit called Rayleigh scattering.
[12] Air coolers are more suitable for –
A.
hot and humid climate
B.
hot and dry climate
C.
cool and humid climate
D.
cool and dry climate
Ans:
hot and dry climate
Explanation :
An air cooler works on the simple principle of evaporation. It does not yield good results when humidity is high. On the contrary, the temperature of dry air can be dropped significantly through the phase transition of liquid water to water vapor (evaporation), which can cool air using much less energy than refrigeration.
[13] Who enunciated the laws of planetary motion?
A.
Nicolaus Copernicus
B.
Johannes Kepler
C.
Isaac Newton
D.
Galileo
Ans:
Johannes Kepler
Explanation :
Kepler's laws of planetary motion are three scientific laws describing orbital motion, each giving a description of the motion of planets around the Sun. The laws are: the orbit of every planet is an ellipse with the Sun at one of the two foci; a line joining a planet and the Sun sweeps out equal areas during equal intervals of time; and the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
[14] The radiant energy having lowest energy is –
A.
gamma rays
B.
UV rays
C.
visible light
D.
microwave radiation
Ans:
microwave radiation
Explanation :
The parts of the electromagnetic spectrum, arranged from highest energy to lowest, are gamma rays, X- rays, Ultraviolet light, visible light, infrared light, microwaves, and radio waves.
[15] When water is heated from 0°C to 10°C. Its volume :
A.
increases
B.
decreases
C.
does not change
D.
first decreases and then increases
Ans:
first decreases and then increases
Explanation :
When water is heated from 0 degree Celsius to 10 degree Celsius, its volume first decreases and then increases. Give reason. When water is heated from 00C, its volume decreases because its density increases and you can see this effect upto 40C.
[16] A force may change of an object.
A.
speed
B.
direction
C.
shape
D.
All options are correct
Ans:
All options are correct
Explanation :
[17] Natural radioactivity was discovered by -
A.
Marie Curie
B.
Ernest Rutherfor
C.
Henri Becquerel
D.
Enrico Fermi
Ans:
Henri Becquerel
Explanation :
The Discovery of Radioactivity. In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[18] A circular plate, a cube and a sphere, all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?
A.
Circular plate
B.
Cube
C.
Sphere
D.
All will cool at the same rate
Ans:
Sphere
Explanation :
In the late of 17th century British scientist Isaac Newton studied cooling of bodies. Experiments showed that the cooling rate is approximately proportional to the difference of temperatures between the heated body and the environment.
[19] The 'Abolition of Titles' is a fundamental right classified under:
A.
Right against Exploitation
B.
Right to Freedom
C.
Right to equality
D.
Right to freedom of religion
Ans:
Right to equality
Explanation :
The right to equality includes equality before law, prohibition of discrimination on grounds of religion, race, caste, gender or place of birth, and equality of opportunity in matters of employment, abolition of untouchability and abolition of titles.
[20] A player making a long jump is an example of .
A.
Projectile motion
B.
Rotatory motion
C.
Spinning motion
D.
Horizontal motion
Ans:
Projectile motion
Explanation :
Projectile motion is a form of motion in which an object or particle is thrown near the earth's surface and it moves along a curved path under the action of gravity only.
[21] Which of the following is arranged in order of decreasing conductivity?
A.
Copper, Aluminium, Steel, Silver
B.
Aluminium, Silver, Copper, Steel
C.
Copper, Silver, Aluminium, Steel
D.
Silver, Copper, Aluminium, Steel
Ans:
Silver, Copper, Aluminium, Steel
Explanation :
Copper ; 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[22] Which of the following liquids is most viscous?
A.
Oil
B.
Milk
C.
Water
D.
petrol
Ans:
Oil
Explanation :
Informally, viscosity is the quantity that describes a fluid's resistance to flow. It is dependent on temperature. Viscosity of the different fluids (in cP) is as follows: Edible Oil: 20 to 60; Milk: approximately 1.0; Water: 0.894; and Petrol: around 0.82 to 0.95 cP.
[23] Which one of the following has the highest value of specific heat?
A.
Glass
B.
Copper
C.
Lead
D.
Water
Ans:
Water
Explanation :
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance. As a result, water plays a very important role in temperature regulation. The specific heat per gram for water is much higher than that for a metal.
[24] When hot-water is sprinkled on a hotter glass tumbler, it breaks because –
A.
glass suddenly expands
B.
glass suddenly contracts
C.
water evaporates
D.
glass reacts chemically with water
Ans:
glass suddenly contracts
Explanation :
If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel.
[25] Electricity is transmitted over long distances –
A.
it is fast
B.
there is less wastage of energy
C.
it is safer
D.
it is cheaper
Ans:
there is less wastage of energy
Explanation :
Long distance means higher wastage of energy. So High volt direct-current (HVDC) technology is used for greater efficiency in very long distances. Electricity is transmitted at high voltages (110 kV or above) to reduce the energy lost in long-distance transmission.
Explanation :
AM broadcasting is the process of radio broadcasting using amplitude modulation. AM was the first method of impressing sound on a radio signal and is still widely used today. An AM receiver detects amplitude variations in the radio waves at a particular frequency. It then amplifies changes in the signal voltage to drive a loudspeaker or earphones.
[6] Bar is a unit of which one of the following?
A.
Force
B.
Energy
C.
Pressure
D.
Frequency
Ans:
Pressure
Explanation :
The bar is a unit of pressure defined as 100 kilopascals. It is about equal to the atmospheric pressure on Earth at sea level.
[7] Bolometer is used to measure –
A.
Frequency
B.
Temperature
C.
Velocity
D.
Wavelength
Ans:
Temperature
Explanation :
A bolometer is a device for measuring the power of incident electromagnetic radiation via the heating of a material with a temperature-dependent electrical resistance. IL was invented in 1878 by the American astronomer Samuel Pierpont Langley. A bolometer consists of an absorptive element, such as a thin layer of metal, connected to a thermal reservoir (a body of constant temperature) through a thermal link.
[8] Supersonic plane fly with the speed -
A.
less than the speed of sound
B.
of sound
C.
greater than the speed of sound
D.
of light
Ans:
greater than the speed of sound
Explanation :
Supersonic travel is a rate of travel of an object that exceeds the speed of sound (Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level, this speed is approximately 344 m/s, 1,125 ft/s, 768 mph, 667 knots, or 1,235 km/h.
[9] If input frequency of a full wave rectifier be n, then output frequency would be -
A.
n/2
B.
n
C.
3n/2
D.
2n
Ans:
2n
Explanation :
The frequency of a full-wave rectifier is double that of the input, if the input is a sine wave. A fullwave rectifier converts the whole of the input waveform to one of constant polarity (positive or negative) at its output. Full-wave rectification converts both polarities of the input waveform to DC (direct current), and yields a higher mean output voltage. Two diodes and a centre tapped transformer, or four diodes in a bridge configuration and any AC source (including a transformer without center tap), are needed. Single semiconductor diodes, double diodes with common cathode or common anode, and four diode bridges, are manufactured as single components.
[10] Heat transfer horizontally within the atmosphere is called –
A.
Conduction
B.
Convection
C.
Absorption
D.
Advection
Ans:
Advection
Explanation :
Convection transfers heat vertically into the atmosphere. In order for heat to be transferred to other regions, it must be transferred horizontally by the wind. The horizontal transfer of heat by the wind is called advection. Advection is a transport mechanism of a substance or conserved property by a fluid due to the fluid's bulk motion. An example of advection is the transport of pollutants or silt in a river by bulk water flow downstream.
[11] The phenomenon of light associated with the appearance of blue colour of the sky is –
A.
Interference
B.
Reflection
C.
Refraction
D.
Scattering
Ans:
Scattering
Explanation :
During daylight, the sky appears to be blue because air scatters blue sunlight more than it scatters red. At night, the sky appears to be a mostly dark surface or region scattered with stars. Except for light that comes directly from the sun, most of the light in the day sky is a result of scattering, which is dominated by a small-particle limit called Rayleigh scattering.
[12] Air coolers are more suitable for –
A.
hot and humid climate
B.
hot and dry climate
C.
cool and humid climate
D.
cool and dry climate
Ans:
hot and dry climate
Explanation :
An air cooler works on the simple principle of evaporation. It does not yield good results when humidity is high. On the contrary, the temperature of dry air can be dropped significantly through the phase transition of liquid water to water vapor (evaporation), which can cool air using much less energy than refrigeration.
[13] Who enunciated the laws of planetary motion?
A.
Nicolaus Copernicus
B.
Johannes Kepler
C.
Isaac Newton
D.
Galileo
Ans:
Johannes Kepler
Explanation :
Kepler's laws of planetary motion are three scientific laws describing orbital motion, each giving a description of the motion of planets around the Sun. The laws are: the orbit of every planet is an ellipse with the Sun at one of the two foci; a line joining a planet and the Sun sweeps out equal areas during equal intervals of time; and the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
[14] The radiant energy having lowest energy is –
A.
gamma rays
B.
UV rays
C.
visible light
D.
microwave radiation
Ans:
microwave radiation
Explanation :
The parts of the electromagnetic spectrum, arranged from highest energy to lowest, are gamma rays, X- rays, Ultraviolet light, visible light, infrared light, microwaves, and radio waves.
[15] When water is heated from 0°C to 10°C. Its volume :
A.
increases
B.
decreases
C.
does not change
D.
first decreases and then increases
Ans:
first decreases and then increases
Explanation :
When water is heated from 0 degree Celsius to 10 degree Celsius, its volume first decreases and then increases. Give reason. When water is heated from 00C, its volume decreases because its density increases and you can see this effect upto 40C.
[16] A force may change of an object.
A.
speed
B.
direction
C.
shape
D.
All options are correct
Ans:
All options are correct
Explanation :
[17] Natural radioactivity was discovered by -
A.
Marie Curie
B.
Ernest Rutherfor
C.
Henri Becquerel
D.
Enrico Fermi
Ans:
Henri Becquerel
Explanation :
The Discovery of Radioactivity. In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[18] A circular plate, a cube and a sphere, all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?
A.
Circular plate
B.
Cube
C.
Sphere
D.
All will cool at the same rate
Ans:
Sphere
Explanation :
In the late of 17th century British scientist Isaac Newton studied cooling of bodies. Experiments showed that the cooling rate is approximately proportional to the difference of temperatures between the heated body and the environment.
[19] The 'Abolition of Titles' is a fundamental right classified under:
A.
Right against Exploitation
B.
Right to Freedom
C.
Right to equality
D.
Right to freedom of religion
Ans:
Right to equality
Explanation :
The right to equality includes equality before law, prohibition of discrimination on grounds of religion, race, caste, gender or place of birth, and equality of opportunity in matters of employment, abolition of untouchability and abolition of titles.
[20] A player making a long jump is an example of .
A.
Projectile motion
B.
Rotatory motion
C.
Spinning motion
D.
Horizontal motion
Ans:
Projectile motion
Explanation :
Projectile motion is a form of motion in which an object or particle is thrown near the earth's surface and it moves along a curved path under the action of gravity only.
[21] Which of the following is arranged in order of decreasing conductivity?
A.
Copper, Aluminium, Steel, Silver
B.
Aluminium, Silver, Copper, Steel
C.
Copper, Silver, Aluminium, Steel
D.
Silver, Copper, Aluminium, Steel
Ans:
Silver, Copper, Aluminium, Steel
Explanation :
Copper ; 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[22] Which of the following liquids is most viscous?
A.
Oil
B.
Milk
C.
Water
D.
petrol
Ans:
Oil
Explanation :
Informally, viscosity is the quantity that describes a fluid's resistance to flow. It is dependent on temperature. Viscosity of the different fluids (in cP) is as follows: Edible Oil: 20 to 60; Milk: approximately 1.0; Water: 0.894; and Petrol: around 0.82 to 0.95 cP.
[23] Which one of the following has the highest value of specific heat?
A.
Glass
B.
Copper
C.
Lead
D.
Water
Ans:
Water
Explanation :
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance. As a result, water plays a very important role in temperature regulation. The specific heat per gram for water is much higher than that for a metal.
[24] When hot-water is sprinkled on a hotter glass tumbler, it breaks because –
A.
glass suddenly expands
B.
glass suddenly contracts
C.
water evaporates
D.
glass reacts chemically with water
Ans:
glass suddenly contracts
Explanation :
If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel.
[25] Electricity is transmitted over long distances –
A.
it is fast
B.
there is less wastage of energy
C.
it is safer
D.
it is cheaper
Ans:
there is less wastage of energy
Explanation :
Long distance means higher wastage of energy. So High volt direct-current (HVDC) technology is used for greater efficiency in very long distances. Electricity is transmitted at high voltages (110 kV or above) to reduce the energy lost in long-distance transmission.
Explanation :
A bolometer is a device for measuring the power of incident electromagnetic radiation via the heating of a material with a temperature-dependent electrical resistance. IL was invented in 1878 by the American astronomer Samuel Pierpont Langley. A bolometer consists of an absorptive element, such as a thin layer of metal, connected to a thermal reservoir (a body of constant temperature) through a thermal link.
[8] Supersonic plane fly with the speed -
A.
less than the speed of sound
B.
of sound
C.
greater than the speed of sound
D.
of light
Ans:
greater than the speed of sound
Explanation :
Supersonic travel is a rate of travel of an object that exceeds the speed of sound (Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) at sea level, this speed is approximately 344 m/s, 1,125 ft/s, 768 mph, 667 knots, or 1,235 km/h.
[9] If input frequency of a full wave rectifier be n, then output frequency would be -
A.
n/2
B.
n
C.
3n/2
D.
2n
Ans:
2n
Explanation :
The frequency of a full-wave rectifier is double that of the input, if the input is a sine wave. A fullwave rectifier converts the whole of the input waveform to one of constant polarity (positive or negative) at its output. Full-wave rectification converts both polarities of the input waveform to DC (direct current), and yields a higher mean output voltage. Two diodes and a centre tapped transformer, or four diodes in a bridge configuration and any AC source (including a transformer without center tap), are needed. Single semiconductor diodes, double diodes with common cathode or common anode, and four diode bridges, are manufactured as single components.
[10] Heat transfer horizontally within the atmosphere is called –
A.
Conduction
B.
Convection
C.
Absorption
D.
Advection
Ans:
Advection
Explanation :
Convection transfers heat vertically into the atmosphere. In order for heat to be transferred to other regions, it must be transferred horizontally by the wind. The horizontal transfer of heat by the wind is called advection. Advection is a transport mechanism of a substance or conserved property by a fluid due to the fluid's bulk motion. An example of advection is the transport of pollutants or silt in a river by bulk water flow downstream.
[11] The phenomenon of light associated with the appearance of blue colour of the sky is –
A.
Interference
B.
Reflection
C.
Refraction
D.
Scattering
Ans:
Scattering
Explanation :
During daylight, the sky appears to be blue because air scatters blue sunlight more than it scatters red. At night, the sky appears to be a mostly dark surface or region scattered with stars. Except for light that comes directly from the sun, most of the light in the day sky is a result of scattering, which is dominated by a small-particle limit called Rayleigh scattering.
[12] Air coolers are more suitable for –
A.
hot and humid climate
B.
hot and dry climate
C.
cool and humid climate
D.
cool and dry climate
Ans:
hot and dry climate
Explanation :
An air cooler works on the simple principle of evaporation. It does not yield good results when humidity is high. On the contrary, the temperature of dry air can be dropped significantly through the phase transition of liquid water to water vapor (evaporation), which can cool air using much less energy than refrigeration.
[13] Who enunciated the laws of planetary motion?
A.
Nicolaus Copernicus
B.
Johannes Kepler
C.
Isaac Newton
D.
Galileo
Ans:
Johannes Kepler
Explanation :
Kepler's laws of planetary motion are three scientific laws describing orbital motion, each giving a description of the motion of planets around the Sun. The laws are: the orbit of every planet is an ellipse with the Sun at one of the two foci; a line joining a planet and the Sun sweeps out equal areas during equal intervals of time; and the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
[14] The radiant energy having lowest energy is –
A.
gamma rays
B.
UV rays
C.
visible light
D.
microwave radiation
Ans:
microwave radiation
Explanation :
The parts of the electromagnetic spectrum, arranged from highest energy to lowest, are gamma rays, X- rays, Ultraviolet light, visible light, infrared light, microwaves, and radio waves.
[15] When water is heated from 0°C to 10°C. Its volume :
A.
increases
B.
decreases
C.
does not change
D.
first decreases and then increases
Ans:
first decreases and then increases
Explanation :
When water is heated from 0 degree Celsius to 10 degree Celsius, its volume first decreases and then increases. Give reason. When water is heated from 00C, its volume decreases because its density increases and you can see this effect upto 40C.
[16] A force may change of an object.
A.
speed
B.
direction
C.
shape
D.
All options are correct
Ans:
All options are correct
Explanation :
[17] Natural radioactivity was discovered by -
A.
Marie Curie
B.
Ernest Rutherfor
C.
Henri Becquerel
D.
Enrico Fermi
Ans:
Henri Becquerel
Explanation :
The Discovery of Radioactivity. In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[18] A circular plate, a cube and a sphere, all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?
A.
Circular plate
B.
Cube
C.
Sphere
D.
All will cool at the same rate
Ans:
Sphere
Explanation :
In the late of 17th century British scientist Isaac Newton studied cooling of bodies. Experiments showed that the cooling rate is approximately proportional to the difference of temperatures between the heated body and the environment.
[19] The 'Abolition of Titles' is a fundamental right classified under:
A.
Right against Exploitation
B.
Right to Freedom
C.
Right to equality
D.
Right to freedom of religion
Ans:
Right to equality
Explanation :
The right to equality includes equality before law, prohibition of discrimination on grounds of religion, race, caste, gender or place of birth, and equality of opportunity in matters of employment, abolition of untouchability and abolition of titles.
[20] A player making a long jump is an example of .
A.
Projectile motion
B.
Rotatory motion
C.
Spinning motion
D.
Horizontal motion
Ans:
Projectile motion
Explanation :
Projectile motion is a form of motion in which an object or particle is thrown near the earth's surface and it moves along a curved path under the action of gravity only.
[21] Which of the following is arranged in order of decreasing conductivity?
A.
Copper, Aluminium, Steel, Silver
B.
Aluminium, Silver, Copper, Steel
C.
Copper, Silver, Aluminium, Steel
D.
Silver, Copper, Aluminium, Steel
Ans:
Silver, Copper, Aluminium, Steel
Explanation :
Copper ; 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[22] Which of the following liquids is most viscous?
A.
Oil
B.
Milk
C.
Water
D.
petrol
Ans:
Oil
Explanation :
Informally, viscosity is the quantity that describes a fluid's resistance to flow. It is dependent on temperature. Viscosity of the different fluids (in cP) is as follows: Edible Oil: 20 to 60; Milk: approximately 1.0; Water: 0.894; and Petrol: around 0.82 to 0.95 cP.
[23] Which one of the following has the highest value of specific heat?
A.
Glass
B.
Copper
C.
Lead
D.
Water
Ans:
Water
Explanation :
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance. As a result, water plays a very important role in temperature regulation. The specific heat per gram for water is much higher than that for a metal.
[24] When hot-water is sprinkled on a hotter glass tumbler, it breaks because –
A.
glass suddenly expands
B.
glass suddenly contracts
C.
water evaporates
D.
glass reacts chemically with water
Ans:
glass suddenly contracts
Explanation :
If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel.
[25] Electricity is transmitted over long distances –
A.
it is fast
B.
there is less wastage of energy
C.
it is safer
D.
it is cheaper
Ans:
there is less wastage of energy
Explanation :
Long distance means higher wastage of energy. So High volt direct-current (HVDC) technology is used for greater efficiency in very long distances. Electricity is transmitted at high voltages (110 kV or above) to reduce the energy lost in long-distance transmission.
Explanation :
The frequency of a full-wave rectifier is double that of the input, if the input is a sine wave. A fullwave rectifier converts the whole of the input waveform to one of constant polarity (positive or negative) at its output. Full-wave rectification converts both polarities of the input waveform to DC (direct current), and yields a higher mean output voltage. Two diodes and a centre tapped transformer, or four diodes in a bridge configuration and any AC source (including a transformer without center tap), are needed. Single semiconductor diodes, double diodes with common cathode or common anode, and four diode bridges, are manufactured as single components.
[10] Heat transfer horizontally within the atmosphere is called –
A.
Conduction
B.
Convection
C.
Absorption
D.
Advection
Ans:
Advection
Explanation :
Convection transfers heat vertically into the atmosphere. In order for heat to be transferred to other regions, it must be transferred horizontally by the wind. The horizontal transfer of heat by the wind is called advection. Advection is a transport mechanism of a substance or conserved property by a fluid due to the fluid's bulk motion. An example of advection is the transport of pollutants or silt in a river by bulk water flow downstream.
[11] The phenomenon of light associated with the appearance of blue colour of the sky is –
A.
Interference
B.
Reflection
C.
Refraction
D.
Scattering
Ans:
Scattering
Explanation :
During daylight, the sky appears to be blue because air scatters blue sunlight more than it scatters red. At night, the sky appears to be a mostly dark surface or region scattered with stars. Except for light that comes directly from the sun, most of the light in the day sky is a result of scattering, which is dominated by a small-particle limit called Rayleigh scattering.
[12] Air coolers are more suitable for –
A.
hot and humid climate
B.
hot and dry climate
C.
cool and humid climate
D.
cool and dry climate
Ans:
hot and dry climate
Explanation :
An air cooler works on the simple principle of evaporation. It does not yield good results when humidity is high. On the contrary, the temperature of dry air can be dropped significantly through the phase transition of liquid water to water vapor (evaporation), which can cool air using much less energy than refrigeration.
[13] Who enunciated the laws of planetary motion?
A.
Nicolaus Copernicus
B.
Johannes Kepler
C.
Isaac Newton
D.
Galileo
Ans:
Johannes Kepler
Explanation :
Kepler's laws of planetary motion are three scientific laws describing orbital motion, each giving a description of the motion of planets around the Sun. The laws are: the orbit of every planet is an ellipse with the Sun at one of the two foci; a line joining a planet and the Sun sweeps out equal areas during equal intervals of time; and the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
[14] The radiant energy having lowest energy is –
A.
gamma rays
B.
UV rays
C.
visible light
D.
microwave radiation
Ans:
microwave radiation
Explanation :
The parts of the electromagnetic spectrum, arranged from highest energy to lowest, are gamma rays, X- rays, Ultraviolet light, visible light, infrared light, microwaves, and radio waves.
[15] When water is heated from 0°C to 10°C. Its volume :
A.
increases
B.
decreases
C.
does not change
D.
first decreases and then increases
Ans:
first decreases and then increases
Explanation :
When water is heated from 0 degree Celsius to 10 degree Celsius, its volume first decreases and then increases. Give reason. When water is heated from 00C, its volume decreases because its density increases and you can see this effect upto 40C.
[16] A force may change of an object.
A.
speed
B.
direction
C.
shape
D.
All options are correct
Ans:
All options are correct
Explanation :
[17] Natural radioactivity was discovered by -
A.
Marie Curie
B.
Ernest Rutherfor
C.
Henri Becquerel
D.
Enrico Fermi
Ans:
Henri Becquerel
Explanation :
The Discovery of Radioactivity. In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[18] A circular plate, a cube and a sphere, all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?
A.
Circular plate
B.
Cube
C.
Sphere
D.
All will cool at the same rate
Ans:
Sphere
Explanation :
In the late of 17th century British scientist Isaac Newton studied cooling of bodies. Experiments showed that the cooling rate is approximately proportional to the difference of temperatures between the heated body and the environment.
[19] The 'Abolition of Titles' is a fundamental right classified under:
A.
Right against Exploitation
B.
Right to Freedom
C.
Right to equality
D.
Right to freedom of religion
Ans:
Right to equality
Explanation :
The right to equality includes equality before law, prohibition of discrimination on grounds of religion, race, caste, gender or place of birth, and equality of opportunity in matters of employment, abolition of untouchability and abolition of titles.
[20] A player making a long jump is an example of .
A.
Projectile motion
B.
Rotatory motion
C.
Spinning motion
D.
Horizontal motion
Ans:
Projectile motion
Explanation :
Projectile motion is a form of motion in which an object or particle is thrown near the earth's surface and it moves along a curved path under the action of gravity only.
[21] Which of the following is arranged in order of decreasing conductivity?
A.
Copper, Aluminium, Steel, Silver
B.
Aluminium, Silver, Copper, Steel
C.
Copper, Silver, Aluminium, Steel
D.
Silver, Copper, Aluminium, Steel
Ans:
Silver, Copper, Aluminium, Steel
Explanation :
Copper ; 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[22] Which of the following liquids is most viscous?
A.
Oil
B.
Milk
C.
Water
D.
petrol
Ans:
Oil
Explanation :
Informally, viscosity is the quantity that describes a fluid's resistance to flow. It is dependent on temperature. Viscosity of the different fluids (in cP) is as follows: Edible Oil: 20 to 60; Milk: approximately 1.0; Water: 0.894; and Petrol: around 0.82 to 0.95 cP.
[23] Which one of the following has the highest value of specific heat?
A.
Glass
B.
Copper
C.
Lead
D.
Water
Ans:
Water
Explanation :
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance. As a result, water plays a very important role in temperature regulation. The specific heat per gram for water is much higher than that for a metal.
[24] When hot-water is sprinkled on a hotter glass tumbler, it breaks because –
A.
glass suddenly expands
B.
glass suddenly contracts
C.
water evaporates
D.
glass reacts chemically with water
Ans:
glass suddenly contracts
Explanation :
If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel.
[25] Electricity is transmitted over long distances –
A.
it is fast
B.
there is less wastage of energy
C.
it is safer
D.
it is cheaper
Ans:
there is less wastage of energy
Explanation :
Long distance means higher wastage of energy. So High volt direct-current (HVDC) technology is used for greater efficiency in very long distances. Electricity is transmitted at high voltages (110 kV or above) to reduce the energy lost in long-distance transmission.
Explanation :
During daylight, the sky appears to be blue because air scatters blue sunlight more than it scatters red. At night, the sky appears to be a mostly dark surface or region scattered with stars. Except for light that comes directly from the sun, most of the light in the day sky is a result of scattering, which is dominated by a small-particle limit called Rayleigh scattering.
[12] Air coolers are more suitable for –
A.
hot and humid climate
B.
hot and dry climate
C.
cool and humid climate
D.
cool and dry climate
Ans:
hot and dry climate
Explanation :
An air cooler works on the simple principle of evaporation. It does not yield good results when humidity is high. On the contrary, the temperature of dry air can be dropped significantly through the phase transition of liquid water to water vapor (evaporation), which can cool air using much less energy than refrigeration.
[13] Who enunciated the laws of planetary motion?
A.
Nicolaus Copernicus
B.
Johannes Kepler
C.
Isaac Newton
D.
Galileo
Ans:
Johannes Kepler
Explanation :
Kepler's laws of planetary motion are three scientific laws describing orbital motion, each giving a description of the motion of planets around the Sun. The laws are: the orbit of every planet is an ellipse with the Sun at one of the two foci; a line joining a planet and the Sun sweeps out equal areas during equal intervals of time; and the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
[14] The radiant energy having lowest energy is –
A.
gamma rays
B.
UV rays
C.
visible light
D.
microwave radiation
Ans:
microwave radiation
Explanation :
The parts of the electromagnetic spectrum, arranged from highest energy to lowest, are gamma rays, X- rays, Ultraviolet light, visible light, infrared light, microwaves, and radio waves.
[15] When water is heated from 0°C to 10°C. Its volume :
A.
increases
B.
decreases
C.
does not change
D.
first decreases and then increases
Ans:
first decreases and then increases
Explanation :
When water is heated from 0 degree Celsius to 10 degree Celsius, its volume first decreases and then increases. Give reason. When water is heated from 00C, its volume decreases because its density increases and you can see this effect upto 40C.
[16] A force may change of an object.
A.
speed
B.
direction
C.
shape
D.
All options are correct
Ans:
All options are correct
Explanation :
[17] Natural radioactivity was discovered by -
A.
Marie Curie
B.
Ernest Rutherfor
C.
Henri Becquerel
D.
Enrico Fermi
Ans:
Henri Becquerel
Explanation :
The Discovery of Radioactivity. In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[18] A circular plate, a cube and a sphere, all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?
A.
Circular plate
B.
Cube
C.
Sphere
D.
All will cool at the same rate
Ans:
Sphere
Explanation :
In the late of 17th century British scientist Isaac Newton studied cooling of bodies. Experiments showed that the cooling rate is approximately proportional to the difference of temperatures between the heated body and the environment.
[19] The 'Abolition of Titles' is a fundamental right classified under:
A.
Right against Exploitation
B.
Right to Freedom
C.
Right to equality
D.
Right to freedom of religion
Ans:
Right to equality
Explanation :
The right to equality includes equality before law, prohibition of discrimination on grounds of religion, race, caste, gender or place of birth, and equality of opportunity in matters of employment, abolition of untouchability and abolition of titles.
[20] A player making a long jump is an example of .
A.
Projectile motion
B.
Rotatory motion
C.
Spinning motion
D.
Horizontal motion
Ans:
Projectile motion
Explanation :
Projectile motion is a form of motion in which an object or particle is thrown near the earth's surface and it moves along a curved path under the action of gravity only.
[21] Which of the following is arranged in order of decreasing conductivity?
A.
Copper, Aluminium, Steel, Silver
B.
Aluminium, Silver, Copper, Steel
C.
Copper, Silver, Aluminium, Steel
D.
Silver, Copper, Aluminium, Steel
Ans:
Silver, Copper, Aluminium, Steel
Explanation :
Copper ; 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[22] Which of the following liquids is most viscous?
A.
Oil
B.
Milk
C.
Water
D.
petrol
Ans:
Oil
Explanation :
Informally, viscosity is the quantity that describes a fluid's resistance to flow. It is dependent on temperature. Viscosity of the different fluids (in cP) is as follows: Edible Oil: 20 to 60; Milk: approximately 1.0; Water: 0.894; and Petrol: around 0.82 to 0.95 cP.
[23] Which one of the following has the highest value of specific heat?
A.
Glass
B.
Copper
C.
Lead
D.
Water
Ans:
Water
Explanation :
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance. As a result, water plays a very important role in temperature regulation. The specific heat per gram for water is much higher than that for a metal.
[24] When hot-water is sprinkled on a hotter glass tumbler, it breaks because –
A.
glass suddenly expands
B.
glass suddenly contracts
C.
water evaporates
D.
glass reacts chemically with water
Ans:
glass suddenly contracts
Explanation :
If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel.
[25] Electricity is transmitted over long distances –
A.
it is fast
B.
there is less wastage of energy
C.
it is safer
D.
it is cheaper
Ans:
there is less wastage of energy
Explanation :
Long distance means higher wastage of energy. So High volt direct-current (HVDC) technology is used for greater efficiency in very long distances. Electricity is transmitted at high voltages (110 kV or above) to reduce the energy lost in long-distance transmission.
Explanation :
Kepler's laws of planetary motion are three scientific laws describing orbital motion, each giving a description of the motion of planets around the Sun. The laws are: the orbit of every planet is an ellipse with the Sun at one of the two foci; a line joining a planet and the Sun sweeps out equal areas during equal intervals of time; and the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
[14] The radiant energy having lowest energy is –
A.
gamma rays
B.
UV rays
C.
visible light
D.
microwave radiation
Ans:
microwave radiation
Explanation :
The parts of the electromagnetic spectrum, arranged from highest energy to lowest, are gamma rays, X- rays, Ultraviolet light, visible light, infrared light, microwaves, and radio waves.
[15] When water is heated from 0°C to 10°C. Its volume :
A.
increases
B.
decreases
C.
does not change
D.
first decreases and then increases
Ans:
first decreases and then increases
Explanation :
When water is heated from 0 degree Celsius to 10 degree Celsius, its volume first decreases and then increases. Give reason. When water is heated from 00C, its volume decreases because its density increases and you can see this effect upto 40C.
[16] A force may change of an object.
A.
speed
B.
direction
C.
shape
D.
All options are correct
Ans:
All options are correct
Explanation :
[17] Natural radioactivity was discovered by -
A.
Marie Curie
B.
Ernest Rutherfor
C.
Henri Becquerel
D.
Enrico Fermi
Ans:
Henri Becquerel
Explanation :
The Discovery of Radioactivity. In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[18] A circular plate, a cube and a sphere, all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?
A.
Circular plate
B.
Cube
C.
Sphere
D.
All will cool at the same rate
Ans:
Sphere
Explanation :
In the late of 17th century British scientist Isaac Newton studied cooling of bodies. Experiments showed that the cooling rate is approximately proportional to the difference of temperatures between the heated body and the environment.
[19] The 'Abolition of Titles' is a fundamental right classified under:
A.
Right against Exploitation
B.
Right to Freedom
C.
Right to equality
D.
Right to freedom of religion
Ans:
Right to equality
Explanation :
The right to equality includes equality before law, prohibition of discrimination on grounds of religion, race, caste, gender or place of birth, and equality of opportunity in matters of employment, abolition of untouchability and abolition of titles.
[20] A player making a long jump is an example of .
A.
Projectile motion
B.
Rotatory motion
C.
Spinning motion
D.
Horizontal motion
Ans:
Projectile motion
Explanation :
Projectile motion is a form of motion in which an object or particle is thrown near the earth's surface and it moves along a curved path under the action of gravity only.
[21] Which of the following is arranged in order of decreasing conductivity?
A.
Copper, Aluminium, Steel, Silver
B.
Aluminium, Silver, Copper, Steel
C.
Copper, Silver, Aluminium, Steel
D.
Silver, Copper, Aluminium, Steel
Ans:
Silver, Copper, Aluminium, Steel
Explanation :
Copper ; 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[22] Which of the following liquids is most viscous?
A.
Oil
B.
Milk
C.
Water
D.
petrol
Ans:
Oil
Explanation :
Informally, viscosity is the quantity that describes a fluid's resistance to flow. It is dependent on temperature. Viscosity of the different fluids (in cP) is as follows: Edible Oil: 20 to 60; Milk: approximately 1.0; Water: 0.894; and Petrol: around 0.82 to 0.95 cP.
[23] Which one of the following has the highest value of specific heat?
A.
Glass
B.
Copper
C.
Lead
D.
Water
Ans:
Water
Explanation :
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance. As a result, water plays a very important role in temperature regulation. The specific heat per gram for water is much higher than that for a metal.
[24] When hot-water is sprinkled on a hotter glass tumbler, it breaks because –
A.
glass suddenly expands
B.
glass suddenly contracts
C.
water evaporates
D.
glass reacts chemically with water
Ans:
glass suddenly contracts
Explanation :
If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel.
[25] Electricity is transmitted over long distances –
A.
it is fast
B.
there is less wastage of energy
C.
it is safer
D.
it is cheaper
Ans:
there is less wastage of energy
Explanation :
Long distance means higher wastage of energy. So High volt direct-current (HVDC) technology is used for greater efficiency in very long distances. Electricity is transmitted at high voltages (110 kV or above) to reduce the energy lost in long-distance transmission.
Explanation :
When water is heated from 0 degree Celsius to 10 degree Celsius, its volume first decreases and then increases. Give reason. When water is heated from 00C, its volume decreases because its density increases and you can see this effect upto 40C.
[16] A force may change of an object.
A.
speed
B.
direction
C.
shape
D.
All options are correct
Ans:
All options are correct
Explanation :
[17] Natural radioactivity was discovered by -
A.
Marie Curie
B.
Ernest Rutherfor
C.
Henri Becquerel
D.
Enrico Fermi
Ans:
Henri Becquerel
Explanation :
The Discovery of Radioactivity. In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[18] A circular plate, a cube and a sphere, all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?
A.
Circular plate
B.
Cube
C.
Sphere
D.
All will cool at the same rate
Ans:
Sphere
Explanation :
In the late of 17th century British scientist Isaac Newton studied cooling of bodies. Experiments showed that the cooling rate is approximately proportional to the difference of temperatures between the heated body and the environment.
[19] The 'Abolition of Titles' is a fundamental right classified under:
A.
Right against Exploitation
B.
Right to Freedom
C.
Right to equality
D.
Right to freedom of religion
Ans:
Right to equality
Explanation :
The right to equality includes equality before law, prohibition of discrimination on grounds of religion, race, caste, gender or place of birth, and equality of opportunity in matters of employment, abolition of untouchability and abolition of titles.
[20] A player making a long jump is an example of .
A.
Projectile motion
B.
Rotatory motion
C.
Spinning motion
D.
Horizontal motion
Ans:
Projectile motion
Explanation :
Projectile motion is a form of motion in which an object or particle is thrown near the earth's surface and it moves along a curved path under the action of gravity only.
[21] Which of the following is arranged in order of decreasing conductivity?
A.
Copper, Aluminium, Steel, Silver
B.
Aluminium, Silver, Copper, Steel
C.
Copper, Silver, Aluminium, Steel
D.
Silver, Copper, Aluminium, Steel
Ans:
Silver, Copper, Aluminium, Steel
Explanation :
Copper ; 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[22] Which of the following liquids is most viscous?
A.
Oil
B.
Milk
C.
Water
D.
petrol
Ans:
Oil
Explanation :
Informally, viscosity is the quantity that describes a fluid's resistance to flow. It is dependent on temperature. Viscosity of the different fluids (in cP) is as follows: Edible Oil: 20 to 60; Milk: approximately 1.0; Water: 0.894; and Petrol: around 0.82 to 0.95 cP.
[23] Which one of the following has the highest value of specific heat?
A.
Glass
B.
Copper
C.
Lead
D.
Water
Ans:
Water
Explanation :
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance. As a result, water plays a very important role in temperature regulation. The specific heat per gram for water is much higher than that for a metal.
[24] When hot-water is sprinkled on a hotter glass tumbler, it breaks because –
A.
glass suddenly expands
B.
glass suddenly contracts
C.
water evaporates
D.
glass reacts chemically with water
Ans:
glass suddenly contracts
Explanation :
If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel.
[25] Electricity is transmitted over long distances –
A.
it is fast
B.
there is less wastage of energy
C.
it is safer
D.
it is cheaper
Ans:
there is less wastage of energy
Explanation :
Long distance means higher wastage of energy. So High volt direct-current (HVDC) technology is used for greater efficiency in very long distances. Electricity is transmitted at high voltages (110 kV or above) to reduce the energy lost in long-distance transmission.
Explanation :
The Discovery of Radioactivity. In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[18] A circular plate, a cube and a sphere, all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?
A.
Circular plate
B.
Cube
C.
Sphere
D.
All will cool at the same rate
Ans:
Sphere
Explanation :
In the late of 17th century British scientist Isaac Newton studied cooling of bodies. Experiments showed that the cooling rate is approximately proportional to the difference of temperatures between the heated body and the environment.
[19] The 'Abolition of Titles' is a fundamental right classified under:
A.
Right against Exploitation
B.
Right to Freedom
C.
Right to equality
D.
Right to freedom of religion
Ans:
Right to equality
Explanation :
The right to equality includes equality before law, prohibition of discrimination on grounds of religion, race, caste, gender or place of birth, and equality of opportunity in matters of employment, abolition of untouchability and abolition of titles.
[20] A player making a long jump is an example of .
A.
Projectile motion
B.
Rotatory motion
C.
Spinning motion
D.
Horizontal motion
Ans:
Projectile motion
Explanation :
Projectile motion is a form of motion in which an object or particle is thrown near the earth's surface and it moves along a curved path under the action of gravity only.
[21] Which of the following is arranged in order of decreasing conductivity?
A.
Copper, Aluminium, Steel, Silver
B.
Aluminium, Silver, Copper, Steel
C.
Copper, Silver, Aluminium, Steel
D.
Silver, Copper, Aluminium, Steel
Ans:
Silver, Copper, Aluminium, Steel
Explanation :
Copper ; 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[22] Which of the following liquids is most viscous?
A.
Oil
B.
Milk
C.
Water
D.
petrol
Ans:
Oil
Explanation :
Informally, viscosity is the quantity that describes a fluid's resistance to flow. It is dependent on temperature. Viscosity of the different fluids (in cP) is as follows: Edible Oil: 20 to 60; Milk: approximately 1.0; Water: 0.894; and Petrol: around 0.82 to 0.95 cP.
[23] Which one of the following has the highest value of specific heat?
A.
Glass
B.
Copper
C.
Lead
D.
Water
Ans:
Water
Explanation :
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance. As a result, water plays a very important role in temperature regulation. The specific heat per gram for water is much higher than that for a metal.
[24] When hot-water is sprinkled on a hotter glass tumbler, it breaks because –
A.
glass suddenly expands
B.
glass suddenly contracts
C.
water evaporates
D.
glass reacts chemically with water
Ans:
glass suddenly contracts
Explanation :
If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel.
[25] Electricity is transmitted over long distances –
A.
it is fast
B.
there is less wastage of energy
C.
it is safer
D.
it is cheaper
Ans:
there is less wastage of energy
Explanation :
Long distance means higher wastage of energy. So High volt direct-current (HVDC) technology is used for greater efficiency in very long distances. Electricity is transmitted at high voltages (110 kV or above) to reduce the energy lost in long-distance transmission.
Explanation :
The right to equality includes equality before law, prohibition of discrimination on grounds of religion, race, caste, gender or place of birth, and equality of opportunity in matters of employment, abolition of untouchability and abolition of titles.
[20] A player making a long jump is an example of .
A.
Projectile motion
B.
Rotatory motion
C.
Spinning motion
D.
Horizontal motion
Ans:
Projectile motion
Explanation :
Projectile motion is a form of motion in which an object or particle is thrown near the earth's surface and it moves along a curved path under the action of gravity only.
[21] Which of the following is arranged in order of decreasing conductivity?
A.
Copper, Aluminium, Steel, Silver
B.
Aluminium, Silver, Copper, Steel
C.
Copper, Silver, Aluminium, Steel
D.
Silver, Copper, Aluminium, Steel
Ans:
Silver, Copper, Aluminium, Steel
Explanation :
Copper ; 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[22] Which of the following liquids is most viscous?
A.
Oil
B.
Milk
C.
Water
D.
petrol
Ans:
Oil
Explanation :
Informally, viscosity is the quantity that describes a fluid's resistance to flow. It is dependent on temperature. Viscosity of the different fluids (in cP) is as follows: Edible Oil: 20 to 60; Milk: approximately 1.0; Water: 0.894; and Petrol: around 0.82 to 0.95 cP.
[23] Which one of the following has the highest value of specific heat?
A.
Glass
B.
Copper
C.
Lead
D.
Water
Ans:
Water
Explanation :
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance. As a result, water plays a very important role in temperature regulation. The specific heat per gram for water is much higher than that for a metal.
[24] When hot-water is sprinkled on a hotter glass tumbler, it breaks because –
A.
glass suddenly expands
B.
glass suddenly contracts
C.
water evaporates
D.
glass reacts chemically with water
Ans:
glass suddenly contracts
Explanation :
If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel.
[25] Electricity is transmitted over long distances –
A.
it is fast
B.
there is less wastage of energy
C.
it is safer
D.
it is cheaper
Ans:
there is less wastage of energy
Explanation :
Long distance means higher wastage of energy. So High volt direct-current (HVDC) technology is used for greater efficiency in very long distances. Electricity is transmitted at high voltages (110 kV or above) to reduce the energy lost in long-distance transmission.
Explanation :
Copper ; 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
[22] Which of the following liquids is most viscous?
A.
Oil
B.
Milk
C.
Water
D.
petrol
Ans:
Oil
Explanation :
Informally, viscosity is the quantity that describes a fluid's resistance to flow. It is dependent on temperature. Viscosity of the different fluids (in cP) is as follows: Edible Oil: 20 to 60; Milk: approximately 1.0; Water: 0.894; and Petrol: around 0.82 to 0.95 cP.
[23] Which one of the following has the highest value of specific heat?
A.
Glass
B.
Copper
C.
Lead
D.
Water
Ans:
Water
Explanation :
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance. As a result, water plays a very important role in temperature regulation. The specific heat per gram for water is much higher than that for a metal.
[24] When hot-water is sprinkled on a hotter glass tumbler, it breaks because –
A.
glass suddenly expands
B.
glass suddenly contracts
C.
water evaporates
D.
glass reacts chemically with water
Ans:
glass suddenly contracts
Explanation :
If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel.
[25] Electricity is transmitted over long distances –
A.
it is fast
B.
there is less wastage of energy
C.
it is safer
D.
it is cheaper
Ans:
there is less wastage of energy
Explanation :
Long distance means higher wastage of energy. So High volt direct-current (HVDC) technology is used for greater efficiency in very long distances. Electricity is transmitted at high voltages (110 kV or above) to reduce the energy lost in long-distance transmission.
Explanation :
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance. As a result, water plays a very important role in temperature regulation. The specific heat per gram for water is much higher than that for a metal.
[24] When hot-water is sprinkled on a hotter glass tumbler, it breaks because –
A.
glass suddenly expands
B.
glass suddenly contracts
C.
water evaporates
D.
glass reacts chemically with water
Ans:
glass suddenly contracts
Explanation :
If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel.
[25] Electricity is transmitted over long distances –
A.
it is fast
B.
there is less wastage of energy
C.
it is safer
D.
it is cheaper
Ans:
there is less wastage of energy
Explanation :
Long distance means higher wastage of energy. So High volt direct-current (HVDC) technology is used for greater efficiency in very long distances. Electricity is transmitted at high voltages (110 kV or above) to reduce the energy lost in long-distance transmission.
Explanation :
Long distance means higher wastage of energy. So High volt direct-current (HVDC) technology is used for greater efficiency in very long distances. Electricity is transmitted at high voltages (110 kV or above) to reduce the energy lost in long-distance transmission.