[1] Which colour is formed when Red and Green are mixed?
A.
Light blue
B.
Yellow
C.
White
D.
Grey
Ans:
Yellow
Explanation :
Red, green and blue are the primary colors and all other colors can be created from them. When red and green combine, the result is yellow.
[2] A water tank appears shallower when it is viewed from top due to –
A.
rectilinear propagation of light
B.
reflection
C.
total internal reflection
D.
refraction
Ans:
refraction
Explanation :
This phenomenon is because of refraction of light. The lines of sight intersect at a higher position than where the actual rays originated. This causes the water to appear shallower than it really is.
[3] The quality or tone of a musical sound produced by a stringed instrument depends on –
A.
frequency of vibration
B.
length of the strings in the instrument
C.
Amplitude of vibration
D.
wave form of the sound
Ans:
wave form of the sound
Explanation :
The timbre or quality of a sound depends on its wave form, which varies with the number of over-tones, or harmonics, that are present, their frequencies, and their relative intensities. In simple terms, timbre is what makes a particular musical sound have a different sound from another, even when they have the same pitch and loudness.
[4] Rocket works on the principle of –
A.
Newton's Third Law
B.
Newton's First Law
C.
Newton's Second Law
D.
Archimedes Principle
Ans:
Newton's Third Law
Explanation :
The modern science of spaceflight and rockets rest on Newton's Three Laws of Motion, a set of ideas and equations developed in the 1600s. In particular, the Third Law, which relates the action and reaction of forces, is essential to explain how a rocket accelerates. To make a rocket move forward, its engines point rearward. The action of the engine thrust produces a reaction on the rocket, accelerating it.
[5] Water is used in hot water bags because –
A.
It is easily obtained
B.
It is cheaper and is not harmful
C.
It has high specific heat
D.
It Is easy to heat water
Ans:
It has high specific heat
Explanation :
The specific heat is the amount of heat per unit mass required to raise the temperature by o ne 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
[6] The motion of the wheels of a bullock-cart while moving on the road is an example of –
A.
Oscillatory and rotatory motion
B.
Oscillatory and translatory motion
C.
Translatory and rotatory motion
D.
Translatory motion only
Ans:
Translatory and rotatory motion
Explanation :
There are four basic types of motion in mechanical systems: Rotary, Linear, Reciprocating and Oscillating motion. Rotatory motion is turning round in a circle, such as a wheel turning. While the wheel is moving, the mechanism transfers translational motion into rotary motion. As a matter of fact, translatory motion and rotatory motion occur at the same time.
[7] Acceleration is –
A.
Inversely proportional to force
B.
Inversely proportional to mass
C.
Directly proportional to mass
D.
Directly proportional to force
Ans:
Inversely proportional to force
Explanation :
Acceleration, in physics, is the rate of change of velocity of an object with respect to time. An object's acceleration is the net result of any and all forces acting on the object, as described by Newton's Second Law. Newton's second law of motion states that acceleration is directly proportional to net force when mass is constant.
[8] A bomb explodes on the moon. You will hear its sound on earth after –
A.
20 minutes
B.
2 hours 20 minutes
C.
3.7 hours
D.
You cannot hear the sound of explosion
Ans:
You cannot hear the sound of explosion
Explanation :
The sound will never reach Earth because there are not enough molecules or atoms of matter per cubic centimeter of space to create the pressure waves in a medium that is a sound wave. In simple words, Sound propagation needs a medium. The people on the Earth can see the flash, but no sound.
[9] One nanometer is equal to
A.
10 raised to the power (-3)
B.
10 raised to the power (-6)
C.
10 raised to the power (-9)
D.
10 raised to the power (-12) meters.
Ans:
10 raised to the power (-9)
Explanation :
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter.
[10] Which of the following is an example of simple harmonic motion?
A.
Earth spinning on its axis
B.
Simple pendulum motion
C.
Bali bouncing on floor
D.
Motion of a ceiling fan
Ans:
Simple pendulum motion
Explanation :
When a body moves about a mean position in such a way that the acceleration is proportional to the displacement and is always directed towards the mean position, the body is said to execute a simple harmonic motion. The motion of a simple pendulum falls under this category.
[11] Magnetic keepers are used to protect magnets from :
A.
Earth's magnetic field
B.
effect of other magnets
C.
self-demagnetization
D.
demagnetization due to heating
Ans:
self-demagnetization
Explanation :
Magnets have a tendency to lose their magnetism when their poles are left bare. This is called self- demagnetization. Magnets are, therefore, protected by keeping them in magnetic keepers.
[12] When we hear a sound, we can identify its source from .
A.
wave length of sound
B.
the overtones present in the sound
C.
the intensity of sound
D.
the amplitude of sound
Ans:
the overtones present in the sound
Explanation :
An overtone is any frequency higher than the fundamental frequency of a sound. Using the model of Fourier analysis, the fundamental and the overtones together are called partials.
[13] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
Rotary motion (angular motion) of a body can take place about an axis that passes through the body or about an axis that does not pass through the body.
[14] If lift is going up with acceleration, the apparent weight of a body is -
A.
may be more or less than true weight
B.
equal to the true weight
C.
less than the true weight
D.
more than the true weight
Ans:
more than the true weight
Explanation :
If lift is going up with acceleration, the apparent weight of a body is more than the true weight.
[15] A galvanometer can be converted into a voltmeter by connecting with it a –
A.
high resistance in parallel
B.
low resistance on parallel
C.
high resistance on series
D.
low resistance in series
Ans:
high resistance on series
Explanation :
In order to convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with the galvanometer. The conversion is made for enabling the galvanometer to measure the potential difference across any component in a circuit.
[16] One nanometer is equal to meters.
A.
10 raised to the power (-3)
B.
10 raised to the power (-6)
C.
10 raised to the power (-9)
D.
10 raised to the power (-12)
Ans:
10 raised to the power (-9)
Explanation :
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter. It is often used to express dimensions on an atomic scale. It is commonly used in nanotechnology, the building of extremely small machines.
[17] What is the objective of the Kyoto Protocol?
A.
To abolish child labour
B.
To eliminate nuclear weapons
C.
To increase ground water levels
D.
To reduce greenhouse gases
Ans:
To reduce greenhouse gases
Explanation :
The Kyoto Protocol is an international treaty which extends the 19992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhourse gas emissions.
[18] Rainbow is formed due to –
A.
refraction and dispersion
B.
scattering and refraction
C.
diffraction and refraction
D.
refraction and reflection
Ans:
refraction and reflection
Explanation :
A rainbow is an optical phenomenon that is caused by both reflection and refraction of light in water droplets resulting in a spectrum of light appearing in the sky. It is caused by light being refracted (bent) when entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it.
[19] Water is used in a hot water bag because –
A.
It is easily available
B.
It has high specific gravity
C.
It has high specific heat
D.
It is a liquid substance
Ans:
It has high specific heat
Explanation :
Water has the highest specific heat of any known substance except hydrogen; that is, it requires more heat to raise the temperature of water a definite number of degrees than it does to raise the temperature of an equal amount of any other substance the same number of degrees.
[20] A fountain pen works on the principle of –
A.
Flow of liquids from higher to lower potential
B.
Capillary action
C.
Bernoulli's principle
D.
Viscosity of liquids
Ans:
Capillary action
Explanation :
A fountain pen is a nib pen that, unlike its predecessor the dip pen, contains an internal reservoir of water-based liquid ink. The pen draws ink from the reservoir through a feed to the nib and deposits it on paper via a combination of gravity and capillary action. Capillary action, or capillarity, is the ability of a liquid to flow in narrow spaces without the assistance of, and in opposition to external forces like gravity.
[21] On which of the following techniques photo state machine works?
A.
Magnetic Image—Making
B.
Thermal Image—Making
C.
Electrostatic Image—Making
D.
Electromagnetic Image Making
Ans:
Electrostatic Image—Making
Explanation :
All Electrostatic Copiers work under the premise that a charge of electricity is placed on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copier or copy machine) is a machine that makes paper copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xerography, a dry process using heat. Copiers can also use other technologies such as ink jet, but xerography is standard for office copying.
[22] The fundamental scientific principle in the operation of battery is –
A.
acid-base interaction
B.
dialysis
C.
dissociation of electrolytes
D.
oxidation-reduction
Ans:
dissociation of electrolytes
Explanation :
The electrolyte consists of a solvent (water, an organic liquid, or even a solid) and one or more chemicals that dissociate into ions in the solvent. These ions serve to deliver electrons and chemical matter through the cell interior to balance the flow of electric current outside the cell during cell operation. An electrolyte is a liquid or gel that contains ions and can be decomposed by electrolysis, e.g., that present in a battery.
[23] Velocity of sound in air does not change with the change of –
A.
Temperature of air
B.
Pressure of air
C.
Moisture content in air
D.
Wind in the direction of propagation of sound
Ans:
Pressure of air
Explanation :
The speed of sound in an ideal gas is independent of frequency, but it weakly depends on frequency for all real physical situations. It is a function of the square root of the absolute temperature, but is independent of pressure or density for a given ideal gas. Sound speed is slightly dependent on pressure only because air is not quite an ideal gas.
[24] The stability of a pond ecosystem depends on -
A.
micro-organisms and fishes
B.
micro-organisms and zoo planktons
C.
fishes and reptiles
D.
producers and consumers
Ans:
producers and consumers
Explanation :
0
[25] Before X-ray examination (coloured X-ray) of the stomach, patients are given suitable salt of barium because.
A.
barium is a good absorber of X-rays and helps stomach to appear clearly
B.
barium salts are white in colour and this helps stomach to appear clearly
C.
barium allows X-rays to pass through the stomach
D.
barium salts are easily available
Ans:
barium is a good absorber of X-rays and helps stomach to appear clearly
Explanation :
0
Explanation :
Red, green and blue are the primary colors and all other colors can be created from them. When red and green combine, the result is yellow.
[2] A water tank appears shallower when it is viewed from top due to –
A.
rectilinear propagation of light
B.
reflection
C.
total internal reflection
D.
refraction
Ans:
refraction
Explanation :
This phenomenon is because of refraction of light. The lines of sight intersect at a higher position than where the actual rays originated. This causes the water to appear shallower than it really is.
[3] The quality or tone of a musical sound produced by a stringed instrument depends on –
A.
frequency of vibration
B.
length of the strings in the instrument
C.
Amplitude of vibration
D.
wave form of the sound
Ans:
wave form of the sound
Explanation :
The timbre or quality of a sound depends on its wave form, which varies with the number of over-tones, or harmonics, that are present, their frequencies, and their relative intensities. In simple terms, timbre is what makes a particular musical sound have a different sound from another, even when they have the same pitch and loudness.
[4] Rocket works on the principle of –
A.
Newton's Third Law
B.
Newton's First Law
C.
Newton's Second Law
D.
Archimedes Principle
Ans:
Newton's Third Law
Explanation :
The modern science of spaceflight and rockets rest on Newton's Three Laws of Motion, a set of ideas and equations developed in the 1600s. In particular, the Third Law, which relates the action and reaction of forces, is essential to explain how a rocket accelerates. To make a rocket move forward, its engines point rearward. The action of the engine thrust produces a reaction on the rocket, accelerating it.
[5] Water is used in hot water bags because –
A.
It is easily obtained
B.
It is cheaper and is not harmful
C.
It has high specific heat
D.
It Is easy to heat water
Ans:
It has high specific heat
Explanation :
The specific heat is the amount of heat per unit mass required to raise the temperature by o ne 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
[6] The motion of the wheels of a bullock-cart while moving on the road is an example of –
A.
Oscillatory and rotatory motion
B.
Oscillatory and translatory motion
C.
Translatory and rotatory motion
D.
Translatory motion only
Ans:
Translatory and rotatory motion
Explanation :
There are four basic types of motion in mechanical systems: Rotary, Linear, Reciprocating and Oscillating motion. Rotatory motion is turning round in a circle, such as a wheel turning. While the wheel is moving, the mechanism transfers translational motion into rotary motion. As a matter of fact, translatory motion and rotatory motion occur at the same time.
[7] Acceleration is –
A.
Inversely proportional to force
B.
Inversely proportional to mass
C.
Directly proportional to mass
D.
Directly proportional to force
Ans:
Inversely proportional to force
Explanation :
Acceleration, in physics, is the rate of change of velocity of an object with respect to time. An object's acceleration is the net result of any and all forces acting on the object, as described by Newton's Second Law. Newton's second law of motion states that acceleration is directly proportional to net force when mass is constant.
[8] A bomb explodes on the moon. You will hear its sound on earth after –
A.
20 minutes
B.
2 hours 20 minutes
C.
3.7 hours
D.
You cannot hear the sound of explosion
Ans:
You cannot hear the sound of explosion
Explanation :
The sound will never reach Earth because there are not enough molecules or atoms of matter per cubic centimeter of space to create the pressure waves in a medium that is a sound wave. In simple words, Sound propagation needs a medium. The people on the Earth can see the flash, but no sound.
[9] One nanometer is equal to
A.
10 raised to the power (-3)
B.
10 raised to the power (-6)
C.
10 raised to the power (-9)
D.
10 raised to the power (-12) meters.
Ans:
10 raised to the power (-9)
Explanation :
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter.
[10] Which of the following is an example of simple harmonic motion?
A.
Earth spinning on its axis
B.
Simple pendulum motion
C.
Bali bouncing on floor
D.
Motion of a ceiling fan
Ans:
Simple pendulum motion
Explanation :
When a body moves about a mean position in such a way that the acceleration is proportional to the displacement and is always directed towards the mean position, the body is said to execute a simple harmonic motion. The motion of a simple pendulum falls under this category.
[11] Magnetic keepers are used to protect magnets from :
A.
Earth's magnetic field
B.
effect of other magnets
C.
self-demagnetization
D.
demagnetization due to heating
Ans:
self-demagnetization
Explanation :
Magnets have a tendency to lose their magnetism when their poles are left bare. This is called self- demagnetization. Magnets are, therefore, protected by keeping them in magnetic keepers.
[12] When we hear a sound, we can identify its source from .
A.
wave length of sound
B.
the overtones present in the sound
C.
the intensity of sound
D.
the amplitude of sound
Ans:
the overtones present in the sound
Explanation :
An overtone is any frequency higher than the fundamental frequency of a sound. Using the model of Fourier analysis, the fundamental and the overtones together are called partials.
[13] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
Rotary motion (angular motion) of a body can take place about an axis that passes through the body or about an axis that does not pass through the body.
[14] If lift is going up with acceleration, the apparent weight of a body is -
A.
may be more or less than true weight
B.
equal to the true weight
C.
less than the true weight
D.
more than the true weight
Ans:
more than the true weight
Explanation :
If lift is going up with acceleration, the apparent weight of a body is more than the true weight.
[15] A galvanometer can be converted into a voltmeter by connecting with it a –
A.
high resistance in parallel
B.
low resistance on parallel
C.
high resistance on series
D.
low resistance in series
Ans:
high resistance on series
Explanation :
In order to convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with the galvanometer. The conversion is made for enabling the galvanometer to measure the potential difference across any component in a circuit.
[16] One nanometer is equal to meters.
A.
10 raised to the power (-3)
B.
10 raised to the power (-6)
C.
10 raised to the power (-9)
D.
10 raised to the power (-12)
Ans:
10 raised to the power (-9)
Explanation :
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter. It is often used to express dimensions on an atomic scale. It is commonly used in nanotechnology, the building of extremely small machines.
[17] What is the objective of the Kyoto Protocol?
A.
To abolish child labour
B.
To eliminate nuclear weapons
C.
To increase ground water levels
D.
To reduce greenhouse gases
Ans:
To reduce greenhouse gases
Explanation :
The Kyoto Protocol is an international treaty which extends the 19992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhourse gas emissions.
[18] Rainbow is formed due to –
A.
refraction and dispersion
B.
scattering and refraction
C.
diffraction and refraction
D.
refraction and reflection
Ans:
refraction and reflection
Explanation :
A rainbow is an optical phenomenon that is caused by both reflection and refraction of light in water droplets resulting in a spectrum of light appearing in the sky. It is caused by light being refracted (bent) when entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it.
[19] Water is used in a hot water bag because –
A.
It is easily available
B.
It has high specific gravity
C.
It has high specific heat
D.
It is a liquid substance
Ans:
It has high specific heat
Explanation :
Water has the highest specific heat of any known substance except hydrogen; that is, it requires more heat to raise the temperature of water a definite number of degrees than it does to raise the temperature of an equal amount of any other substance the same number of degrees.
[20] A fountain pen works on the principle of –
A.
Flow of liquids from higher to lower potential
B.
Capillary action
C.
Bernoulli's principle
D.
Viscosity of liquids
Ans:
Capillary action
Explanation :
A fountain pen is a nib pen that, unlike its predecessor the dip pen, contains an internal reservoir of water-based liquid ink. The pen draws ink from the reservoir through a feed to the nib and deposits it on paper via a combination of gravity and capillary action. Capillary action, or capillarity, is the ability of a liquid to flow in narrow spaces without the assistance of, and in opposition to external forces like gravity.
[21] On which of the following techniques photo state machine works?
A.
Magnetic Image—Making
B.
Thermal Image—Making
C.
Electrostatic Image—Making
D.
Electromagnetic Image Making
Ans:
Electrostatic Image—Making
Explanation :
All Electrostatic Copiers work under the premise that a charge of electricity is placed on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copier or copy machine) is a machine that makes paper copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xerography, a dry process using heat. Copiers can also use other technologies such as ink jet, but xerography is standard for office copying.
[22] The fundamental scientific principle in the operation of battery is –
A.
acid-base interaction
B.
dialysis
C.
dissociation of electrolytes
D.
oxidation-reduction
Ans:
dissociation of electrolytes
Explanation :
The electrolyte consists of a solvent (water, an organic liquid, or even a solid) and one or more chemicals that dissociate into ions in the solvent. These ions serve to deliver electrons and chemical matter through the cell interior to balance the flow of electric current outside the cell during cell operation. An electrolyte is a liquid or gel that contains ions and can be decomposed by electrolysis, e.g., that present in a battery.
[23] Velocity of sound in air does not change with the change of –
A.
Temperature of air
B.
Pressure of air
C.
Moisture content in air
D.
Wind in the direction of propagation of sound
Ans:
Pressure of air
Explanation :
The speed of sound in an ideal gas is independent of frequency, but it weakly depends on frequency for all real physical situations. It is a function of the square root of the absolute temperature, but is independent of pressure or density for a given ideal gas. Sound speed is slightly dependent on pressure only because air is not quite an ideal gas.
[24] The stability of a pond ecosystem depends on -
A.
micro-organisms and fishes
B.
micro-organisms and zoo planktons
C.
fishes and reptiles
D.
producers and consumers
Ans:
producers and consumers
Explanation :
0
[25] Before X-ray examination (coloured X-ray) of the stomach, patients are given suitable salt of barium because.
A.
barium is a good absorber of X-rays and helps stomach to appear clearly
B.
barium salts are white in colour and this helps stomach to appear clearly
C.
barium allows X-rays to pass through the stomach
D.
barium salts are easily available
Ans:
barium is a good absorber of X-rays and helps stomach to appear clearly
Explanation :
0
Explanation :
The timbre or quality of a sound depends on its wave form, which varies with the number of over-tones, or harmonics, that are present, their frequencies, and their relative intensities. In simple terms, timbre is what makes a particular musical sound have a different sound from another, even when they have the same pitch and loudness.
[4] Rocket works on the principle of –
A.
Newton's Third Law
B.
Newton's First Law
C.
Newton's Second Law
D.
Archimedes Principle
Ans:
Newton's Third Law
Explanation :
The modern science of spaceflight and rockets rest on Newton's Three Laws of Motion, a set of ideas and equations developed in the 1600s. In particular, the Third Law, which relates the action and reaction of forces, is essential to explain how a rocket accelerates. To make a rocket move forward, its engines point rearward. The action of the engine thrust produces a reaction on the rocket, accelerating it.
[5] Water is used in hot water bags because –
A.
It is easily obtained
B.
It is cheaper and is not harmful
C.
It has high specific heat
D.
It Is easy to heat water
Ans:
It has high specific heat
Explanation :
The specific heat is the amount of heat per unit mass required to raise the temperature by o ne 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
[6] The motion of the wheels of a bullock-cart while moving on the road is an example of –
A.
Oscillatory and rotatory motion
B.
Oscillatory and translatory motion
C.
Translatory and rotatory motion
D.
Translatory motion only
Ans:
Translatory and rotatory motion
Explanation :
There are four basic types of motion in mechanical systems: Rotary, Linear, Reciprocating and Oscillating motion. Rotatory motion is turning round in a circle, such as a wheel turning. While the wheel is moving, the mechanism transfers translational motion into rotary motion. As a matter of fact, translatory motion and rotatory motion occur at the same time.
[7] Acceleration is –
A.
Inversely proportional to force
B.
Inversely proportional to mass
C.
Directly proportional to mass
D.
Directly proportional to force
Ans:
Inversely proportional to force
Explanation :
Acceleration, in physics, is the rate of change of velocity of an object with respect to time. An object's acceleration is the net result of any and all forces acting on the object, as described by Newton's Second Law. Newton's second law of motion states that acceleration is directly proportional to net force when mass is constant.
[8] A bomb explodes on the moon. You will hear its sound on earth after –
A.
20 minutes
B.
2 hours 20 minutes
C.
3.7 hours
D.
You cannot hear the sound of explosion
Ans:
You cannot hear the sound of explosion
Explanation :
The sound will never reach Earth because there are not enough molecules or atoms of matter per cubic centimeter of space to create the pressure waves in a medium that is a sound wave. In simple words, Sound propagation needs a medium. The people on the Earth can see the flash, but no sound.
[9] One nanometer is equal to
A.
10 raised to the power (-3)
B.
10 raised to the power (-6)
C.
10 raised to the power (-9)
D.
10 raised to the power (-12) meters.
Ans:
10 raised to the power (-9)
Explanation :
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter.
[10] Which of the following is an example of simple harmonic motion?
A.
Earth spinning on its axis
B.
Simple pendulum motion
C.
Bali bouncing on floor
D.
Motion of a ceiling fan
Ans:
Simple pendulum motion
Explanation :
When a body moves about a mean position in such a way that the acceleration is proportional to the displacement and is always directed towards the mean position, the body is said to execute a simple harmonic motion. The motion of a simple pendulum falls under this category.
[11] Magnetic keepers are used to protect magnets from :
A.
Earth's magnetic field
B.
effect of other magnets
C.
self-demagnetization
D.
demagnetization due to heating
Ans:
self-demagnetization
Explanation :
Magnets have a tendency to lose their magnetism when their poles are left bare. This is called self- demagnetization. Magnets are, therefore, protected by keeping them in magnetic keepers.
[12] When we hear a sound, we can identify its source from .
A.
wave length of sound
B.
the overtones present in the sound
C.
the intensity of sound
D.
the amplitude of sound
Ans:
the overtones present in the sound
Explanation :
An overtone is any frequency higher than the fundamental frequency of a sound. Using the model of Fourier analysis, the fundamental and the overtones together are called partials.
[13] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
Rotary motion (angular motion) of a body can take place about an axis that passes through the body or about an axis that does not pass through the body.
[14] If lift is going up with acceleration, the apparent weight of a body is -
A.
may be more or less than true weight
B.
equal to the true weight
C.
less than the true weight
D.
more than the true weight
Ans:
more than the true weight
Explanation :
If lift is going up with acceleration, the apparent weight of a body is more than the true weight.
[15] A galvanometer can be converted into a voltmeter by connecting with it a –
A.
high resistance in parallel
B.
low resistance on parallel
C.
high resistance on series
D.
low resistance in series
Ans:
high resistance on series
Explanation :
In order to convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with the galvanometer. The conversion is made for enabling the galvanometer to measure the potential difference across any component in a circuit.
[16] One nanometer is equal to meters.
A.
10 raised to the power (-3)
B.
10 raised to the power (-6)
C.
10 raised to the power (-9)
D.
10 raised to the power (-12)
Ans:
10 raised to the power (-9)
Explanation :
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter. It is often used to express dimensions on an atomic scale. It is commonly used in nanotechnology, the building of extremely small machines.
[17] What is the objective of the Kyoto Protocol?
A.
To abolish child labour
B.
To eliminate nuclear weapons
C.
To increase ground water levels
D.
To reduce greenhouse gases
Ans:
To reduce greenhouse gases
Explanation :
The Kyoto Protocol is an international treaty which extends the 19992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhourse gas emissions.
[18] Rainbow is formed due to –
A.
refraction and dispersion
B.
scattering and refraction
C.
diffraction and refraction
D.
refraction and reflection
Ans:
refraction and reflection
Explanation :
A rainbow is an optical phenomenon that is caused by both reflection and refraction of light in water droplets resulting in a spectrum of light appearing in the sky. It is caused by light being refracted (bent) when entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it.
[19] Water is used in a hot water bag because –
A.
It is easily available
B.
It has high specific gravity
C.
It has high specific heat
D.
It is a liquid substance
Ans:
It has high specific heat
Explanation :
Water has the highest specific heat of any known substance except hydrogen; that is, it requires more heat to raise the temperature of water a definite number of degrees than it does to raise the temperature of an equal amount of any other substance the same number of degrees.
[20] A fountain pen works on the principle of –
A.
Flow of liquids from higher to lower potential
B.
Capillary action
C.
Bernoulli's principle
D.
Viscosity of liquids
Ans:
Capillary action
Explanation :
A fountain pen is a nib pen that, unlike its predecessor the dip pen, contains an internal reservoir of water-based liquid ink. The pen draws ink from the reservoir through a feed to the nib and deposits it on paper via a combination of gravity and capillary action. Capillary action, or capillarity, is the ability of a liquid to flow in narrow spaces without the assistance of, and in opposition to external forces like gravity.
[21] On which of the following techniques photo state machine works?
A.
Magnetic Image—Making
B.
Thermal Image—Making
C.
Electrostatic Image—Making
D.
Electromagnetic Image Making
Ans:
Electrostatic Image—Making
Explanation :
All Electrostatic Copiers work under the premise that a charge of electricity is placed on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copier or copy machine) is a machine that makes paper copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xerography, a dry process using heat. Copiers can also use other technologies such as ink jet, but xerography is standard for office copying.
[22] The fundamental scientific principle in the operation of battery is –
A.
acid-base interaction
B.
dialysis
C.
dissociation of electrolytes
D.
oxidation-reduction
Ans:
dissociation of electrolytes
Explanation :
The electrolyte consists of a solvent (water, an organic liquid, or even a solid) and one or more chemicals that dissociate into ions in the solvent. These ions serve to deliver electrons and chemical matter through the cell interior to balance the flow of electric current outside the cell during cell operation. An electrolyte is a liquid or gel that contains ions and can be decomposed by electrolysis, e.g., that present in a battery.
[23] Velocity of sound in air does not change with the change of –
A.
Temperature of air
B.
Pressure of air
C.
Moisture content in air
D.
Wind in the direction of propagation of sound
Ans:
Pressure of air
Explanation :
The speed of sound in an ideal gas is independent of frequency, but it weakly depends on frequency for all real physical situations. It is a function of the square root of the absolute temperature, but is independent of pressure or density for a given ideal gas. Sound speed is slightly dependent on pressure only because air is not quite an ideal gas.
[24] The stability of a pond ecosystem depends on -
A.
micro-organisms and fishes
B.
micro-organisms and zoo planktons
C.
fishes and reptiles
D.
producers and consumers
Ans:
producers and consumers
Explanation :
0
[25] Before X-ray examination (coloured X-ray) of the stomach, patients are given suitable salt of barium because.
A.
barium is a good absorber of X-rays and helps stomach to appear clearly
B.
barium salts are white in colour and this helps stomach to appear clearly
C.
barium allows X-rays to pass through the stomach
D.
barium salts are easily available
Ans:
barium is a good absorber of X-rays and helps stomach to appear clearly
Explanation :
0
Explanation :
The specific heat is the amount of heat per unit mass required to raise the temperature by o ne 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
[6] The motion of the wheels of a bullock-cart while moving on the road is an example of –
A.
Oscillatory and rotatory motion
B.
Oscillatory and translatory motion
C.
Translatory and rotatory motion
D.
Translatory motion only
Ans:
Translatory and rotatory motion
Explanation :
There are four basic types of motion in mechanical systems: Rotary, Linear, Reciprocating and Oscillating motion. Rotatory motion is turning round in a circle, such as a wheel turning. While the wheel is moving, the mechanism transfers translational motion into rotary motion. As a matter of fact, translatory motion and rotatory motion occur at the same time.
[7] Acceleration is –
A.
Inversely proportional to force
B.
Inversely proportional to mass
C.
Directly proportional to mass
D.
Directly proportional to force
Ans:
Inversely proportional to force
Explanation :
Acceleration, in physics, is the rate of change of velocity of an object with respect to time. An object's acceleration is the net result of any and all forces acting on the object, as described by Newton's Second Law. Newton's second law of motion states that acceleration is directly proportional to net force when mass is constant.
[8] A bomb explodes on the moon. You will hear its sound on earth after –
A.
20 minutes
B.
2 hours 20 minutes
C.
3.7 hours
D.
You cannot hear the sound of explosion
Ans:
You cannot hear the sound of explosion
Explanation :
The sound will never reach Earth because there are not enough molecules or atoms of matter per cubic centimeter of space to create the pressure waves in a medium that is a sound wave. In simple words, Sound propagation needs a medium. The people on the Earth can see the flash, but no sound.
[9] One nanometer is equal to
A.
10 raised to the power (-3)
B.
10 raised to the power (-6)
C.
10 raised to the power (-9)
D.
10 raised to the power (-12) meters.
Ans:
10 raised to the power (-9)
Explanation :
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter.
[10] Which of the following is an example of simple harmonic motion?
A.
Earth spinning on its axis
B.
Simple pendulum motion
C.
Bali bouncing on floor
D.
Motion of a ceiling fan
Ans:
Simple pendulum motion
Explanation :
When a body moves about a mean position in such a way that the acceleration is proportional to the displacement and is always directed towards the mean position, the body is said to execute a simple harmonic motion. The motion of a simple pendulum falls under this category.
[11] Magnetic keepers are used to protect magnets from :
A.
Earth's magnetic field
B.
effect of other magnets
C.
self-demagnetization
D.
demagnetization due to heating
Ans:
self-demagnetization
Explanation :
Magnets have a tendency to lose their magnetism when their poles are left bare. This is called self- demagnetization. Magnets are, therefore, protected by keeping them in magnetic keepers.
[12] When we hear a sound, we can identify its source from .
A.
wave length of sound
B.
the overtones present in the sound
C.
the intensity of sound
D.
the amplitude of sound
Ans:
the overtones present in the sound
Explanation :
An overtone is any frequency higher than the fundamental frequency of a sound. Using the model of Fourier analysis, the fundamental and the overtones together are called partials.
[13] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
Rotary motion (angular motion) of a body can take place about an axis that passes through the body or about an axis that does not pass through the body.
[14] If lift is going up with acceleration, the apparent weight of a body is -
A.
may be more or less than true weight
B.
equal to the true weight
C.
less than the true weight
D.
more than the true weight
Ans:
more than the true weight
Explanation :
If lift is going up with acceleration, the apparent weight of a body is more than the true weight.
[15] A galvanometer can be converted into a voltmeter by connecting with it a –
A.
high resistance in parallel
B.
low resistance on parallel
C.
high resistance on series
D.
low resistance in series
Ans:
high resistance on series
Explanation :
In order to convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with the galvanometer. The conversion is made for enabling the galvanometer to measure the potential difference across any component in a circuit.
[16] One nanometer is equal to meters.
A.
10 raised to the power (-3)
B.
10 raised to the power (-6)
C.
10 raised to the power (-9)
D.
10 raised to the power (-12)
Ans:
10 raised to the power (-9)
Explanation :
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter. It is often used to express dimensions on an atomic scale. It is commonly used in nanotechnology, the building of extremely small machines.
[17] What is the objective of the Kyoto Protocol?
A.
To abolish child labour
B.
To eliminate nuclear weapons
C.
To increase ground water levels
D.
To reduce greenhouse gases
Ans:
To reduce greenhouse gases
Explanation :
The Kyoto Protocol is an international treaty which extends the 19992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhourse gas emissions.
[18] Rainbow is formed due to –
A.
refraction and dispersion
B.
scattering and refraction
C.
diffraction and refraction
D.
refraction and reflection
Ans:
refraction and reflection
Explanation :
A rainbow is an optical phenomenon that is caused by both reflection and refraction of light in water droplets resulting in a spectrum of light appearing in the sky. It is caused by light being refracted (bent) when entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it.
[19] Water is used in a hot water bag because –
A.
It is easily available
B.
It has high specific gravity
C.
It has high specific heat
D.
It is a liquid substance
Ans:
It has high specific heat
Explanation :
Water has the highest specific heat of any known substance except hydrogen; that is, it requires more heat to raise the temperature of water a definite number of degrees than it does to raise the temperature of an equal amount of any other substance the same number of degrees.
[20] A fountain pen works on the principle of –
A.
Flow of liquids from higher to lower potential
B.
Capillary action
C.
Bernoulli's principle
D.
Viscosity of liquids
Ans:
Capillary action
Explanation :
A fountain pen is a nib pen that, unlike its predecessor the dip pen, contains an internal reservoir of water-based liquid ink. The pen draws ink from the reservoir through a feed to the nib and deposits it on paper via a combination of gravity and capillary action. Capillary action, or capillarity, is the ability of a liquid to flow in narrow spaces without the assistance of, and in opposition to external forces like gravity.
[21] On which of the following techniques photo state machine works?
A.
Magnetic Image—Making
B.
Thermal Image—Making
C.
Electrostatic Image—Making
D.
Electromagnetic Image Making
Ans:
Electrostatic Image—Making
Explanation :
All Electrostatic Copiers work under the premise that a charge of electricity is placed on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copier or copy machine) is a machine that makes paper copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xerography, a dry process using heat. Copiers can also use other technologies such as ink jet, but xerography is standard for office copying.
[22] The fundamental scientific principle in the operation of battery is –
A.
acid-base interaction
B.
dialysis
C.
dissociation of electrolytes
D.
oxidation-reduction
Ans:
dissociation of electrolytes
Explanation :
The electrolyte consists of a solvent (water, an organic liquid, or even a solid) and one or more chemicals that dissociate into ions in the solvent. These ions serve to deliver electrons and chemical matter through the cell interior to balance the flow of electric current outside the cell during cell operation. An electrolyte is a liquid or gel that contains ions and can be decomposed by electrolysis, e.g., that present in a battery.
[23] Velocity of sound in air does not change with the change of –
A.
Temperature of air
B.
Pressure of air
C.
Moisture content in air
D.
Wind in the direction of propagation of sound
Ans:
Pressure of air
Explanation :
The speed of sound in an ideal gas is independent of frequency, but it weakly depends on frequency for all real physical situations. It is a function of the square root of the absolute temperature, but is independent of pressure or density for a given ideal gas. Sound speed is slightly dependent on pressure only because air is not quite an ideal gas.
[24] The stability of a pond ecosystem depends on -
A.
micro-organisms and fishes
B.
micro-organisms and zoo planktons
C.
fishes and reptiles
D.
producers and consumers
Ans:
producers and consumers
Explanation :
0
[25] Before X-ray examination (coloured X-ray) of the stomach, patients are given suitable salt of barium because.
A.
barium is a good absorber of X-rays and helps stomach to appear clearly
B.
barium salts are white in colour and this helps stomach to appear clearly
C.
barium allows X-rays to pass through the stomach
D.
barium salts are easily available
Ans:
barium is a good absorber of X-rays and helps stomach to appear clearly
Explanation :
0
Explanation :
Acceleration, in physics, is the rate of change of velocity of an object with respect to time. An object's acceleration is the net result of any and all forces acting on the object, as described by Newton's Second Law. Newton's second law of motion states that acceleration is directly proportional to net force when mass is constant.
[8] A bomb explodes on the moon. You will hear its sound on earth after –
A.
20 minutes
B.
2 hours 20 minutes
C.
3.7 hours
D.
You cannot hear the sound of explosion
Ans:
You cannot hear the sound of explosion
Explanation :
The sound will never reach Earth because there are not enough molecules or atoms of matter per cubic centimeter of space to create the pressure waves in a medium that is a sound wave. In simple words, Sound propagation needs a medium. The people on the Earth can see the flash, but no sound.
[9] One nanometer is equal to
A.
10 raised to the power (-3)
B.
10 raised to the power (-6)
C.
10 raised to the power (-9)
D.
10 raised to the power (-12) meters.
Ans:
10 raised to the power (-9)
Explanation :
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter.
[10] Which of the following is an example of simple harmonic motion?
A.
Earth spinning on its axis
B.
Simple pendulum motion
C.
Bali bouncing on floor
D.
Motion of a ceiling fan
Ans:
Simple pendulum motion
Explanation :
When a body moves about a mean position in such a way that the acceleration is proportional to the displacement and is always directed towards the mean position, the body is said to execute a simple harmonic motion. The motion of a simple pendulum falls under this category.
[11] Magnetic keepers are used to protect magnets from :
A.
Earth's magnetic field
B.
effect of other magnets
C.
self-demagnetization
D.
demagnetization due to heating
Ans:
self-demagnetization
Explanation :
Magnets have a tendency to lose their magnetism when their poles are left bare. This is called self- demagnetization. Magnets are, therefore, protected by keeping them in magnetic keepers.
[12] When we hear a sound, we can identify its source from .
A.
wave length of sound
B.
the overtones present in the sound
C.
the intensity of sound
D.
the amplitude of sound
Ans:
the overtones present in the sound
Explanation :
An overtone is any frequency higher than the fundamental frequency of a sound. Using the model of Fourier analysis, the fundamental and the overtones together are called partials.
[13] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
Rotary motion (angular motion) of a body can take place about an axis that passes through the body or about an axis that does not pass through the body.
[14] If lift is going up with acceleration, the apparent weight of a body is -
A.
may be more or less than true weight
B.
equal to the true weight
C.
less than the true weight
D.
more than the true weight
Ans:
more than the true weight
Explanation :
If lift is going up with acceleration, the apparent weight of a body is more than the true weight.
[15] A galvanometer can be converted into a voltmeter by connecting with it a –
A.
high resistance in parallel
B.
low resistance on parallel
C.
high resistance on series
D.
low resistance in series
Ans:
high resistance on series
Explanation :
In order to convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with the galvanometer. The conversion is made for enabling the galvanometer to measure the potential difference across any component in a circuit.
[16] One nanometer is equal to meters.
A.
10 raised to the power (-3)
B.
10 raised to the power (-6)
C.
10 raised to the power (-9)
D.
10 raised to the power (-12)
Ans:
10 raised to the power (-9)
Explanation :
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter. It is often used to express dimensions on an atomic scale. It is commonly used in nanotechnology, the building of extremely small machines.
[17] What is the objective of the Kyoto Protocol?
A.
To abolish child labour
B.
To eliminate nuclear weapons
C.
To increase ground water levels
D.
To reduce greenhouse gases
Ans:
To reduce greenhouse gases
Explanation :
The Kyoto Protocol is an international treaty which extends the 19992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhourse gas emissions.
[18] Rainbow is formed due to –
A.
refraction and dispersion
B.
scattering and refraction
C.
diffraction and refraction
D.
refraction and reflection
Ans:
refraction and reflection
Explanation :
A rainbow is an optical phenomenon that is caused by both reflection and refraction of light in water droplets resulting in a spectrum of light appearing in the sky. It is caused by light being refracted (bent) when entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it.
[19] Water is used in a hot water bag because –
A.
It is easily available
B.
It has high specific gravity
C.
It has high specific heat
D.
It is a liquid substance
Ans:
It has high specific heat
Explanation :
Water has the highest specific heat of any known substance except hydrogen; that is, it requires more heat to raise the temperature of water a definite number of degrees than it does to raise the temperature of an equal amount of any other substance the same number of degrees.
[20] A fountain pen works on the principle of –
A.
Flow of liquids from higher to lower potential
B.
Capillary action
C.
Bernoulli's principle
D.
Viscosity of liquids
Ans:
Capillary action
Explanation :
A fountain pen is a nib pen that, unlike its predecessor the dip pen, contains an internal reservoir of water-based liquid ink. The pen draws ink from the reservoir through a feed to the nib and deposits it on paper via a combination of gravity and capillary action. Capillary action, or capillarity, is the ability of a liquid to flow in narrow spaces without the assistance of, and in opposition to external forces like gravity.
[21] On which of the following techniques photo state machine works?
A.
Magnetic Image—Making
B.
Thermal Image—Making
C.
Electrostatic Image—Making
D.
Electromagnetic Image Making
Ans:
Electrostatic Image—Making
Explanation :
All Electrostatic Copiers work under the premise that a charge of electricity is placed on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copier or copy machine) is a machine that makes paper copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xerography, a dry process using heat. Copiers can also use other technologies such as ink jet, but xerography is standard for office copying.
[22] The fundamental scientific principle in the operation of battery is –
A.
acid-base interaction
B.
dialysis
C.
dissociation of electrolytes
D.
oxidation-reduction
Ans:
dissociation of electrolytes
Explanation :
The electrolyte consists of a solvent (water, an organic liquid, or even a solid) and one or more chemicals that dissociate into ions in the solvent. These ions serve to deliver electrons and chemical matter through the cell interior to balance the flow of electric current outside the cell during cell operation. An electrolyte is a liquid or gel that contains ions and can be decomposed by electrolysis, e.g., that present in a battery.
[23] Velocity of sound in air does not change with the change of –
A.
Temperature of air
B.
Pressure of air
C.
Moisture content in air
D.
Wind in the direction of propagation of sound
Ans:
Pressure of air
Explanation :
The speed of sound in an ideal gas is independent of frequency, but it weakly depends on frequency for all real physical situations. It is a function of the square root of the absolute temperature, but is independent of pressure or density for a given ideal gas. Sound speed is slightly dependent on pressure only because air is not quite an ideal gas.
[24] The stability of a pond ecosystem depends on -
A.
micro-organisms and fishes
B.
micro-organisms and zoo planktons
C.
fishes and reptiles
D.
producers and consumers
Ans:
producers and consumers
Explanation :
0
[25] Before X-ray examination (coloured X-ray) of the stomach, patients are given suitable salt of barium because.
A.
barium is a good absorber of X-rays and helps stomach to appear clearly
B.
barium salts are white in colour and this helps stomach to appear clearly
C.
barium allows X-rays to pass through the stomach
D.
barium salts are easily available
Ans:
barium is a good absorber of X-rays and helps stomach to appear clearly
Explanation :
0
Explanation :
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter.
[10] Which of the following is an example of simple harmonic motion?
A.
Earth spinning on its axis
B.
Simple pendulum motion
C.
Bali bouncing on floor
D.
Motion of a ceiling fan
Ans:
Simple pendulum motion
Explanation :
When a body moves about a mean position in such a way that the acceleration is proportional to the displacement and is always directed towards the mean position, the body is said to execute a simple harmonic motion. The motion of a simple pendulum falls under this category.
[11] Magnetic keepers are used to protect magnets from :
A.
Earth's magnetic field
B.
effect of other magnets
C.
self-demagnetization
D.
demagnetization due to heating
Ans:
self-demagnetization
Explanation :
Magnets have a tendency to lose their magnetism when their poles are left bare. This is called self- demagnetization. Magnets are, therefore, protected by keeping them in magnetic keepers.
[12] When we hear a sound, we can identify its source from .
A.
wave length of sound
B.
the overtones present in the sound
C.
the intensity of sound
D.
the amplitude of sound
Ans:
the overtones present in the sound
Explanation :
An overtone is any frequency higher than the fundamental frequency of a sound. Using the model of Fourier analysis, the fundamental and the overtones together are called partials.
[13] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
Rotary motion (angular motion) of a body can take place about an axis that passes through the body or about an axis that does not pass through the body.
[14] If lift is going up with acceleration, the apparent weight of a body is -
A.
may be more or less than true weight
B.
equal to the true weight
C.
less than the true weight
D.
more than the true weight
Ans:
more than the true weight
Explanation :
If lift is going up with acceleration, the apparent weight of a body is more than the true weight.
[15] A galvanometer can be converted into a voltmeter by connecting with it a –
A.
high resistance in parallel
B.
low resistance on parallel
C.
high resistance on series
D.
low resistance in series
Ans:
high resistance on series
Explanation :
In order to convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with the galvanometer. The conversion is made for enabling the galvanometer to measure the potential difference across any component in a circuit.
[16] One nanometer is equal to meters.
A.
10 raised to the power (-3)
B.
10 raised to the power (-6)
C.
10 raised to the power (-9)
D.
10 raised to the power (-12)
Ans:
10 raised to the power (-9)
Explanation :
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter. It is often used to express dimensions on an atomic scale. It is commonly used in nanotechnology, the building of extremely small machines.
[17] What is the objective of the Kyoto Protocol?
A.
To abolish child labour
B.
To eliminate nuclear weapons
C.
To increase ground water levels
D.
To reduce greenhouse gases
Ans:
To reduce greenhouse gases
Explanation :
The Kyoto Protocol is an international treaty which extends the 19992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhourse gas emissions.
[18] Rainbow is formed due to –
A.
refraction and dispersion
B.
scattering and refraction
C.
diffraction and refraction
D.
refraction and reflection
Ans:
refraction and reflection
Explanation :
A rainbow is an optical phenomenon that is caused by both reflection and refraction of light in water droplets resulting in a spectrum of light appearing in the sky. It is caused by light being refracted (bent) when entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it.
[19] Water is used in a hot water bag because –
A.
It is easily available
B.
It has high specific gravity
C.
It has high specific heat
D.
It is a liquid substance
Ans:
It has high specific heat
Explanation :
Water has the highest specific heat of any known substance except hydrogen; that is, it requires more heat to raise the temperature of water a definite number of degrees than it does to raise the temperature of an equal amount of any other substance the same number of degrees.
[20] A fountain pen works on the principle of –
A.
Flow of liquids from higher to lower potential
B.
Capillary action
C.
Bernoulli's principle
D.
Viscosity of liquids
Ans:
Capillary action
Explanation :
A fountain pen is a nib pen that, unlike its predecessor the dip pen, contains an internal reservoir of water-based liquid ink. The pen draws ink from the reservoir through a feed to the nib and deposits it on paper via a combination of gravity and capillary action. Capillary action, or capillarity, is the ability of a liquid to flow in narrow spaces without the assistance of, and in opposition to external forces like gravity.
[21] On which of the following techniques photo state machine works?
A.
Magnetic Image—Making
B.
Thermal Image—Making
C.
Electrostatic Image—Making
D.
Electromagnetic Image Making
Ans:
Electrostatic Image—Making
Explanation :
All Electrostatic Copiers work under the premise that a charge of electricity is placed on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copier or copy machine) is a machine that makes paper copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xerography, a dry process using heat. Copiers can also use other technologies such as ink jet, but xerography is standard for office copying.
[22] The fundamental scientific principle in the operation of battery is –
A.
acid-base interaction
B.
dialysis
C.
dissociation of electrolytes
D.
oxidation-reduction
Ans:
dissociation of electrolytes
Explanation :
The electrolyte consists of a solvent (water, an organic liquid, or even a solid) and one or more chemicals that dissociate into ions in the solvent. These ions serve to deliver electrons and chemical matter through the cell interior to balance the flow of electric current outside the cell during cell operation. An electrolyte is a liquid or gel that contains ions and can be decomposed by electrolysis, e.g., that present in a battery.
[23] Velocity of sound in air does not change with the change of –
A.
Temperature of air
B.
Pressure of air
C.
Moisture content in air
D.
Wind in the direction of propagation of sound
Ans:
Pressure of air
Explanation :
The speed of sound in an ideal gas is independent of frequency, but it weakly depends on frequency for all real physical situations. It is a function of the square root of the absolute temperature, but is independent of pressure or density for a given ideal gas. Sound speed is slightly dependent on pressure only because air is not quite an ideal gas.
[24] The stability of a pond ecosystem depends on -
A.
micro-organisms and fishes
B.
micro-organisms and zoo planktons
C.
fishes and reptiles
D.
producers and consumers
Ans:
producers and consumers
Explanation :
0
[25] Before X-ray examination (coloured X-ray) of the stomach, patients are given suitable salt of barium because.
A.
barium is a good absorber of X-rays and helps stomach to appear clearly
B.
barium salts are white in colour and this helps stomach to appear clearly
C.
barium allows X-rays to pass through the stomach
D.
barium salts are easily available
Ans:
barium is a good absorber of X-rays and helps stomach to appear clearly
Explanation :
0
Explanation :
Magnets have a tendency to lose their magnetism when their poles are left bare. This is called self- demagnetization. Magnets are, therefore, protected by keeping them in magnetic keepers.
[12] When we hear a sound, we can identify its source from .
A.
wave length of sound
B.
the overtones present in the sound
C.
the intensity of sound
D.
the amplitude of sound
Ans:
the overtones present in the sound
Explanation :
An overtone is any frequency higher than the fundamental frequency of a sound. Using the model of Fourier analysis, the fundamental and the overtones together are called partials.
[13] What are the two kinds of Rotatory motion?
A.
Spin and Vibrational motion
B.
Spin and Orbital motion
C.
Spin and Translatory motion
D.
Spin and Projectile motion
Ans:
Spin and Orbital motion
Explanation :
Rotary motion (angular motion) of a body can take place about an axis that passes through the body or about an axis that does not pass through the body.
[14] If lift is going up with acceleration, the apparent weight of a body is -
A.
may be more or less than true weight
B.
equal to the true weight
C.
less than the true weight
D.
more than the true weight
Ans:
more than the true weight
Explanation :
If lift is going up with acceleration, the apparent weight of a body is more than the true weight.
[15] A galvanometer can be converted into a voltmeter by connecting with it a –
A.
high resistance in parallel
B.
low resistance on parallel
C.
high resistance on series
D.
low resistance in series
Ans:
high resistance on series
Explanation :
In order to convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with the galvanometer. The conversion is made for enabling the galvanometer to measure the potential difference across any component in a circuit.
[16] One nanometer is equal to meters.
A.
10 raised to the power (-3)
B.
10 raised to the power (-6)
C.
10 raised to the power (-9)
D.
10 raised to the power (-12)
Ans:
10 raised to the power (-9)
Explanation :
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter. It is often used to express dimensions on an atomic scale. It is commonly used in nanotechnology, the building of extremely small machines.
[17] What is the objective of the Kyoto Protocol?
A.
To abolish child labour
B.
To eliminate nuclear weapons
C.
To increase ground water levels
D.
To reduce greenhouse gases
Ans:
To reduce greenhouse gases
Explanation :
The Kyoto Protocol is an international treaty which extends the 19992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhourse gas emissions.
[18] Rainbow is formed due to –
A.
refraction and dispersion
B.
scattering and refraction
C.
diffraction and refraction
D.
refraction and reflection
Ans:
refraction and reflection
Explanation :
A rainbow is an optical phenomenon that is caused by both reflection and refraction of light in water droplets resulting in a spectrum of light appearing in the sky. It is caused by light being refracted (bent) when entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it.
[19] Water is used in a hot water bag because –
A.
It is easily available
B.
It has high specific gravity
C.
It has high specific heat
D.
It is a liquid substance
Ans:
It has high specific heat
Explanation :
Water has the highest specific heat of any known substance except hydrogen; that is, it requires more heat to raise the temperature of water a definite number of degrees than it does to raise the temperature of an equal amount of any other substance the same number of degrees.
[20] A fountain pen works on the principle of –
A.
Flow of liquids from higher to lower potential
B.
Capillary action
C.
Bernoulli's principle
D.
Viscosity of liquids
Ans:
Capillary action
Explanation :
A fountain pen is a nib pen that, unlike its predecessor the dip pen, contains an internal reservoir of water-based liquid ink. The pen draws ink from the reservoir through a feed to the nib and deposits it on paper via a combination of gravity and capillary action. Capillary action, or capillarity, is the ability of a liquid to flow in narrow spaces without the assistance of, and in opposition to external forces like gravity.
[21] On which of the following techniques photo state machine works?
A.
Magnetic Image—Making
B.
Thermal Image—Making
C.
Electrostatic Image—Making
D.
Electromagnetic Image Making
Ans:
Electrostatic Image—Making
Explanation :
All Electrostatic Copiers work under the premise that a charge of electricity is placed on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copier or copy machine) is a machine that makes paper copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xerography, a dry process using heat. Copiers can also use other technologies such as ink jet, but xerography is standard for office copying.
[22] The fundamental scientific principle in the operation of battery is –
A.
acid-base interaction
B.
dialysis
C.
dissociation of electrolytes
D.
oxidation-reduction
Ans:
dissociation of electrolytes
Explanation :
The electrolyte consists of a solvent (water, an organic liquid, or even a solid) and one or more chemicals that dissociate into ions in the solvent. These ions serve to deliver electrons and chemical matter through the cell interior to balance the flow of electric current outside the cell during cell operation. An electrolyte is a liquid or gel that contains ions and can be decomposed by electrolysis, e.g., that present in a battery.
[23] Velocity of sound in air does not change with the change of –
A.
Temperature of air
B.
Pressure of air
C.
Moisture content in air
D.
Wind in the direction of propagation of sound
Ans:
Pressure of air
Explanation :
The speed of sound in an ideal gas is independent of frequency, but it weakly depends on frequency for all real physical situations. It is a function of the square root of the absolute temperature, but is independent of pressure or density for a given ideal gas. Sound speed is slightly dependent on pressure only because air is not quite an ideal gas.
[24] The stability of a pond ecosystem depends on -
A.
micro-organisms and fishes
B.
micro-organisms and zoo planktons
C.
fishes and reptiles
D.
producers and consumers
Ans:
producers and consumers
Explanation :
0
[25] Before X-ray examination (coloured X-ray) of the stomach, patients are given suitable salt of barium because.
A.
barium is a good absorber of X-rays and helps stomach to appear clearly
B.
barium salts are white in colour and this helps stomach to appear clearly
C.
barium allows X-rays to pass through the stomach
D.
barium salts are easily available
Ans:
barium is a good absorber of X-rays and helps stomach to appear clearly
Explanation :
0
Explanation :
Rotary motion (angular motion) of a body can take place about an axis that passes through the body or about an axis that does not pass through the body.
[14] If lift is going up with acceleration, the apparent weight of a body is -
A.
may be more or less than true weight
B.
equal to the true weight
C.
less than the true weight
D.
more than the true weight
Ans:
more than the true weight
Explanation :
If lift is going up with acceleration, the apparent weight of a body is more than the true weight.
[15] A galvanometer can be converted into a voltmeter by connecting with it a –
A.
high resistance in parallel
B.
low resistance on parallel
C.
high resistance on series
D.
low resistance in series
Ans:
high resistance on series
Explanation :
In order to convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with the galvanometer. The conversion is made for enabling the galvanometer to measure the potential difference across any component in a circuit.
[16] One nanometer is equal to meters.
A.
10 raised to the power (-3)
B.
10 raised to the power (-6)
C.
10 raised to the power (-9)
D.
10 raised to the power (-12)
Ans:
10 raised to the power (-9)
Explanation :
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter. It is often used to express dimensions on an atomic scale. It is commonly used in nanotechnology, the building of extremely small machines.
[17] What is the objective of the Kyoto Protocol?
A.
To abolish child labour
B.
To eliminate nuclear weapons
C.
To increase ground water levels
D.
To reduce greenhouse gases
Ans:
To reduce greenhouse gases
Explanation :
The Kyoto Protocol is an international treaty which extends the 19992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhourse gas emissions.
[18] Rainbow is formed due to –
A.
refraction and dispersion
B.
scattering and refraction
C.
diffraction and refraction
D.
refraction and reflection
Ans:
refraction and reflection
Explanation :
A rainbow is an optical phenomenon that is caused by both reflection and refraction of light in water droplets resulting in a spectrum of light appearing in the sky. It is caused by light being refracted (bent) when entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it.
[19] Water is used in a hot water bag because –
A.
It is easily available
B.
It has high specific gravity
C.
It has high specific heat
D.
It is a liquid substance
Ans:
It has high specific heat
Explanation :
Water has the highest specific heat of any known substance except hydrogen; that is, it requires more heat to raise the temperature of water a definite number of degrees than it does to raise the temperature of an equal amount of any other substance the same number of degrees.
[20] A fountain pen works on the principle of –
A.
Flow of liquids from higher to lower potential
B.
Capillary action
C.
Bernoulli's principle
D.
Viscosity of liquids
Ans:
Capillary action
Explanation :
A fountain pen is a nib pen that, unlike its predecessor the dip pen, contains an internal reservoir of water-based liquid ink. The pen draws ink from the reservoir through a feed to the nib and deposits it on paper via a combination of gravity and capillary action. Capillary action, or capillarity, is the ability of a liquid to flow in narrow spaces without the assistance of, and in opposition to external forces like gravity.
[21] On which of the following techniques photo state machine works?
A.
Magnetic Image—Making
B.
Thermal Image—Making
C.
Electrostatic Image—Making
D.
Electromagnetic Image Making
Ans:
Electrostatic Image—Making
Explanation :
All Electrostatic Copiers work under the premise that a charge of electricity is placed on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copier or copy machine) is a machine that makes paper copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xerography, a dry process using heat. Copiers can also use other technologies such as ink jet, but xerography is standard for office copying.
[22] The fundamental scientific principle in the operation of battery is –
A.
acid-base interaction
B.
dialysis
C.
dissociation of electrolytes
D.
oxidation-reduction
Ans:
dissociation of electrolytes
Explanation :
The electrolyte consists of a solvent (water, an organic liquid, or even a solid) and one or more chemicals that dissociate into ions in the solvent. These ions serve to deliver electrons and chemical matter through the cell interior to balance the flow of electric current outside the cell during cell operation. An electrolyte is a liquid or gel that contains ions and can be decomposed by electrolysis, e.g., that present in a battery.
[23] Velocity of sound in air does not change with the change of –
A.
Temperature of air
B.
Pressure of air
C.
Moisture content in air
D.
Wind in the direction of propagation of sound
Ans:
Pressure of air
Explanation :
The speed of sound in an ideal gas is independent of frequency, but it weakly depends on frequency for all real physical situations. It is a function of the square root of the absolute temperature, but is independent of pressure or density for a given ideal gas. Sound speed is slightly dependent on pressure only because air is not quite an ideal gas.
[24] The stability of a pond ecosystem depends on -
A.
micro-organisms and fishes
B.
micro-organisms and zoo planktons
C.
fishes and reptiles
D.
producers and consumers
Ans:
producers and consumers
Explanation :
0
[25] Before X-ray examination (coloured X-ray) of the stomach, patients are given suitable salt of barium because.
A.
barium is a good absorber of X-rays and helps stomach to appear clearly
B.
barium salts are white in colour and this helps stomach to appear clearly
C.
barium allows X-rays to pass through the stomach
D.
barium salts are easily available
Ans:
barium is a good absorber of X-rays and helps stomach to appear clearly
Explanation :
0
Explanation :
In order to convert a Galvanometer into voltmeter, a very high resistance known as "series resistance" is connected in series with the galvanometer. The conversion is made for enabling the galvanometer to measure the potential difference across any component in a circuit.
[16] One nanometer is equal to meters.
A.
10 raised to the power (-3)
B.
10 raised to the power (-6)
C.
10 raised to the power (-9)
D.
10 raised to the power (-12)
Ans:
10 raised to the power (-9)
Explanation :
A nanometer is a unit of spatial measurement that is 10-9 meter, or one billionth of a meter. It is often used to express dimensions on an atomic scale. It is commonly used in nanotechnology, the building of extremely small machines.
[17] What is the objective of the Kyoto Protocol?
A.
To abolish child labour
B.
To eliminate nuclear weapons
C.
To increase ground water levels
D.
To reduce greenhouse gases
Ans:
To reduce greenhouse gases
Explanation :
The Kyoto Protocol is an international treaty which extends the 19992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhourse gas emissions.
[18] Rainbow is formed due to –
A.
refraction and dispersion
B.
scattering and refraction
C.
diffraction and refraction
D.
refraction and reflection
Ans:
refraction and reflection
Explanation :
A rainbow is an optical phenomenon that is caused by both reflection and refraction of light in water droplets resulting in a spectrum of light appearing in the sky. It is caused by light being refracted (bent) when entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it.
[19] Water is used in a hot water bag because –
A.
It is easily available
B.
It has high specific gravity
C.
It has high specific heat
D.
It is a liquid substance
Ans:
It has high specific heat
Explanation :
Water has the highest specific heat of any known substance except hydrogen; that is, it requires more heat to raise the temperature of water a definite number of degrees than it does to raise the temperature of an equal amount of any other substance the same number of degrees.
[20] A fountain pen works on the principle of –
A.
Flow of liquids from higher to lower potential
B.
Capillary action
C.
Bernoulli's principle
D.
Viscosity of liquids
Ans:
Capillary action
Explanation :
A fountain pen is a nib pen that, unlike its predecessor the dip pen, contains an internal reservoir of water-based liquid ink. The pen draws ink from the reservoir through a feed to the nib and deposits it on paper via a combination of gravity and capillary action. Capillary action, or capillarity, is the ability of a liquid to flow in narrow spaces without the assistance of, and in opposition to external forces like gravity.
[21] On which of the following techniques photo state machine works?
A.
Magnetic Image—Making
B.
Thermal Image—Making
C.
Electrostatic Image—Making
D.
Electromagnetic Image Making
Ans:
Electrostatic Image—Making
Explanation :
All Electrostatic Copiers work under the premise that a charge of electricity is placed on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copier or copy machine) is a machine that makes paper copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xerography, a dry process using heat. Copiers can also use other technologies such as ink jet, but xerography is standard for office copying.
[22] The fundamental scientific principle in the operation of battery is –
A.
acid-base interaction
B.
dialysis
C.
dissociation of electrolytes
D.
oxidation-reduction
Ans:
dissociation of electrolytes
Explanation :
The electrolyte consists of a solvent (water, an organic liquid, or even a solid) and one or more chemicals that dissociate into ions in the solvent. These ions serve to deliver electrons and chemical matter through the cell interior to balance the flow of electric current outside the cell during cell operation. An electrolyte is a liquid or gel that contains ions and can be decomposed by electrolysis, e.g., that present in a battery.
[23] Velocity of sound in air does not change with the change of –
A.
Temperature of air
B.
Pressure of air
C.
Moisture content in air
D.
Wind in the direction of propagation of sound
Ans:
Pressure of air
Explanation :
The speed of sound in an ideal gas is independent of frequency, but it weakly depends on frequency for all real physical situations. It is a function of the square root of the absolute temperature, but is independent of pressure or density for a given ideal gas. Sound speed is slightly dependent on pressure only because air is not quite an ideal gas.
[24] The stability of a pond ecosystem depends on -
A.
micro-organisms and fishes
B.
micro-organisms and zoo planktons
C.
fishes and reptiles
D.
producers and consumers
Ans:
producers and consumers
Explanation :
0
[25] Before X-ray examination (coloured X-ray) of the stomach, patients are given suitable salt of barium because.
A.
barium is a good absorber of X-rays and helps stomach to appear clearly
B.
barium salts are white in colour and this helps stomach to appear clearly
C.
barium allows X-rays to pass through the stomach
D.
barium salts are easily available
Ans:
barium is a good absorber of X-rays and helps stomach to appear clearly
Explanation :
0
Explanation :
The Kyoto Protocol is an international treaty which extends the 19992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhourse gas emissions.
[18] Rainbow is formed due to –
A.
refraction and dispersion
B.
scattering and refraction
C.
diffraction and refraction
D.
refraction and reflection
Ans:
refraction and reflection
Explanation :
A rainbow is an optical phenomenon that is caused by both reflection and refraction of light in water droplets resulting in a spectrum of light appearing in the sky. It is caused by light being refracted (bent) when entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it.
[19] Water is used in a hot water bag because –
A.
It is easily available
B.
It has high specific gravity
C.
It has high specific heat
D.
It is a liquid substance
Ans:
It has high specific heat
Explanation :
Water has the highest specific heat of any known substance except hydrogen; that is, it requires more heat to raise the temperature of water a definite number of degrees than it does to raise the temperature of an equal amount of any other substance the same number of degrees.
[20] A fountain pen works on the principle of –
A.
Flow of liquids from higher to lower potential
B.
Capillary action
C.
Bernoulli's principle
D.
Viscosity of liquids
Ans:
Capillary action
Explanation :
A fountain pen is a nib pen that, unlike its predecessor the dip pen, contains an internal reservoir of water-based liquid ink. The pen draws ink from the reservoir through a feed to the nib and deposits it on paper via a combination of gravity and capillary action. Capillary action, or capillarity, is the ability of a liquid to flow in narrow spaces without the assistance of, and in opposition to external forces like gravity.
[21] On which of the following techniques photo state machine works?
A.
Magnetic Image—Making
B.
Thermal Image—Making
C.
Electrostatic Image—Making
D.
Electromagnetic Image Making
Ans:
Electrostatic Image—Making
Explanation :
All Electrostatic Copiers work under the premise that a charge of electricity is placed on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copier or copy machine) is a machine that makes paper copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xerography, a dry process using heat. Copiers can also use other technologies such as ink jet, but xerography is standard for office copying.
[22] The fundamental scientific principle in the operation of battery is –
A.
acid-base interaction
B.
dialysis
C.
dissociation of electrolytes
D.
oxidation-reduction
Ans:
dissociation of electrolytes
Explanation :
The electrolyte consists of a solvent (water, an organic liquid, or even a solid) and one or more chemicals that dissociate into ions in the solvent. These ions serve to deliver electrons and chemical matter through the cell interior to balance the flow of electric current outside the cell during cell operation. An electrolyte is a liquid or gel that contains ions and can be decomposed by electrolysis, e.g., that present in a battery.
[23] Velocity of sound in air does not change with the change of –
A.
Temperature of air
B.
Pressure of air
C.
Moisture content in air
D.
Wind in the direction of propagation of sound
Ans:
Pressure of air
Explanation :
The speed of sound in an ideal gas is independent of frequency, but it weakly depends on frequency for all real physical situations. It is a function of the square root of the absolute temperature, but is independent of pressure or density for a given ideal gas. Sound speed is slightly dependent on pressure only because air is not quite an ideal gas.
[24] The stability of a pond ecosystem depends on -
A.
micro-organisms and fishes
B.
micro-organisms and zoo planktons
C.
fishes and reptiles
D.
producers and consumers
Ans:
producers and consumers
Explanation :
0
[25] Before X-ray examination (coloured X-ray) of the stomach, patients are given suitable salt of barium because.
A.
barium is a good absorber of X-rays and helps stomach to appear clearly
B.
barium salts are white in colour and this helps stomach to appear clearly
C.
barium allows X-rays to pass through the stomach
D.
barium salts are easily available
Ans:
barium is a good absorber of X-rays and helps stomach to appear clearly
Explanation :
0
Explanation :
Water has the highest specific heat of any known substance except hydrogen; that is, it requires more heat to raise the temperature of water a definite number of degrees than it does to raise the temperature of an equal amount of any other substance the same number of degrees.
[20] A fountain pen works on the principle of –
A.
Flow of liquids from higher to lower potential
B.
Capillary action
C.
Bernoulli's principle
D.
Viscosity of liquids
Ans:
Capillary action
Explanation :
A fountain pen is a nib pen that, unlike its predecessor the dip pen, contains an internal reservoir of water-based liquid ink. The pen draws ink from the reservoir through a feed to the nib and deposits it on paper via a combination of gravity and capillary action. Capillary action, or capillarity, is the ability of a liquid to flow in narrow spaces without the assistance of, and in opposition to external forces like gravity.
[21] On which of the following techniques photo state machine works?
A.
Magnetic Image—Making
B.
Thermal Image—Making
C.
Electrostatic Image—Making
D.
Electromagnetic Image Making
Ans:
Electrostatic Image—Making
Explanation :
All Electrostatic Copiers work under the premise that a charge of electricity is placed on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copier or copy machine) is a machine that makes paper copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xerography, a dry process using heat. Copiers can also use other technologies such as ink jet, but xerography is standard for office copying.
[22] The fundamental scientific principle in the operation of battery is –
A.
acid-base interaction
B.
dialysis
C.
dissociation of electrolytes
D.
oxidation-reduction
Ans:
dissociation of electrolytes
Explanation :
The electrolyte consists of a solvent (water, an organic liquid, or even a solid) and one or more chemicals that dissociate into ions in the solvent. These ions serve to deliver electrons and chemical matter through the cell interior to balance the flow of electric current outside the cell during cell operation. An electrolyte is a liquid or gel that contains ions and can be decomposed by electrolysis, e.g., that present in a battery.
[23] Velocity of sound in air does not change with the change of –
A.
Temperature of air
B.
Pressure of air
C.
Moisture content in air
D.
Wind in the direction of propagation of sound
Ans:
Pressure of air
Explanation :
The speed of sound in an ideal gas is independent of frequency, but it weakly depends on frequency for all real physical situations. It is a function of the square root of the absolute temperature, but is independent of pressure or density for a given ideal gas. Sound speed is slightly dependent on pressure only because air is not quite an ideal gas.
[24] The stability of a pond ecosystem depends on -
A.
micro-organisms and fishes
B.
micro-organisms and zoo planktons
C.
fishes and reptiles
D.
producers and consumers
Ans:
producers and consumers
Explanation :
0
[25] Before X-ray examination (coloured X-ray) of the stomach, patients are given suitable salt of barium because.
A.
barium is a good absorber of X-rays and helps stomach to appear clearly
B.
barium salts are white in colour and this helps stomach to appear clearly
C.
barium allows X-rays to pass through the stomach
D.
barium salts are easily available
Ans:
barium is a good absorber of X-rays and helps stomach to appear clearly
Explanation :
0
Explanation :
All Electrostatic Copiers work under the premise that a charge of electricity is placed on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copier or copy machine) is a machine that makes paper copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xerography, a dry process using heat. Copiers can also use other technologies such as ink jet, but xerography is standard for office copying.
[22] The fundamental scientific principle in the operation of battery is –
A.
acid-base interaction
B.
dialysis
C.
dissociation of electrolytes
D.
oxidation-reduction
Ans:
dissociation of electrolytes
Explanation :
The electrolyte consists of a solvent (water, an organic liquid, or even a solid) and one or more chemicals that dissociate into ions in the solvent. These ions serve to deliver electrons and chemical matter through the cell interior to balance the flow of electric current outside the cell during cell operation. An electrolyte is a liquid or gel that contains ions and can be decomposed by electrolysis, e.g., that present in a battery.
[23] Velocity of sound in air does not change with the change of –
A.
Temperature of air
B.
Pressure of air
C.
Moisture content in air
D.
Wind in the direction of propagation of sound
Ans:
Pressure of air
Explanation :
The speed of sound in an ideal gas is independent of frequency, but it weakly depends on frequency for all real physical situations. It is a function of the square root of the absolute temperature, but is independent of pressure or density for a given ideal gas. Sound speed is slightly dependent on pressure only because air is not quite an ideal gas.
[24] The stability of a pond ecosystem depends on -
A.
micro-organisms and fishes
B.
micro-organisms and zoo planktons
C.
fishes and reptiles
D.
producers and consumers
Ans:
producers and consumers
Explanation :
0
[25] Before X-ray examination (coloured X-ray) of the stomach, patients are given suitable salt of barium because.
A.
barium is a good absorber of X-rays and helps stomach to appear clearly
B.
barium salts are white in colour and this helps stomach to appear clearly
C.
barium allows X-rays to pass through the stomach
D.
barium salts are easily available
Ans:
barium is a good absorber of X-rays and helps stomach to appear clearly
Explanation :
0
Explanation :
The speed of sound in an ideal gas is independent of frequency, but it weakly depends on frequency for all real physical situations. It is a function of the square root of the absolute temperature, but is independent of pressure or density for a given ideal gas. Sound speed is slightly dependent on pressure only because air is not quite an ideal gas.
[24] The stability of a pond ecosystem depends on -
A.
micro-organisms and fishes
B.
micro-organisms and zoo planktons
C.
fishes and reptiles
D.
producers and consumers
Ans:
producers and consumers
Explanation :
0
[25] Before X-ray examination (coloured X-ray) of the stomach, patients are given suitable salt of barium because.
A.
barium is a good absorber of X-rays and helps stomach to appear clearly
B.
barium salts are white in colour and this helps stomach to appear clearly
C.
barium allows X-rays to pass through the stomach
D.
barium salts are easily available
Ans:
barium is a good absorber of X-rays and helps stomach to appear clearly
Explanation :
0
Explanation :
0