Define Cohesive force and Adhesive force

Define Cohesive force and Adhesive force 
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1 Answer

Answer :

i) Cohesive force: - It is the force of attraction between two molecules of same substance. 

ii) Adhesive force: - It is the force of attraction between two molecules of different substance.
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Surface tension in a liquid is due to : (1) Adhesive force between molecules (2) Cohesive force between molecules (3) Gravitational force between molecules (4) Electrical force between molecules

Description : Surface tension in a liquid is due to : (1) Adhesive force between molecules (2) Cohesive force between molecules (3) Gravitational force between molecules (4) Electrical force between molecules

Last Answer : (2) Cohesive force between molecules Explanation: Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force. This property is caused by cohesion of similar molecules, and is responsible for many of the behaviors of liquids.

Surface tension in a liquid is due to : (1) Adhesive force between molecules (2) Cohesive force between molecules (3) Gravitational force between molecules (4) Electrical force between molecules

Description : Surface tension in a liquid is due to : (1) Adhesive force between molecules (2) Cohesive force between molecules (3) Gravitational force between molecules (4) Electrical force between molecules

Last Answer : (2) Cohesive force between molecules Explanation: Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force. This property is caused by cohesion of similar molecules, and is responsible for many of the behaviors of liquids.

Surface tension in a liquid is due to : (1) Adhesive force between molecules (2) Cohesive force between molecules (3) Gravitational force between molecules (4) Electrical force between molecules.

Description : Surface tension in a liquid is due to : (1) Adhesive force between molecules (2) Cohesive force between molecules (3) Gravitational force between molecules (4) Electrical force between molecules.

Last Answer :  Cohesive force between molecules

Pick out the wrong statement. (A) Surface tension of a liquid is because of the difference in magnitude of adhesive & cohesive forces(B) A hydrometer used for the determination of specific gravities of liquidsworks on the principle of buoyant forces(C) In case of unsteady fluid flow, the velocity at any given point does notchange with time(D) Turbulent fluid flow is characterised by the rapid fluctuation ofinstantaneous pressure & velocity at a poin

Description : Pick out the wrong statement. (A) Surface tension of a liquid is because of the difference in magnitude of adhesive & cohesive forces (B) A hydrometer used for the determination of ... Turbulent fluid flow is characterised by the rapid fluctuation of instantaneous pressure & velocity at a poin

Last Answer : (C) In case of unsteady fluid flow, the velocity at any given point does not change with time

Define. i) Streamline flow ii) Turbulent flow Give significance of Reynold’s number.

Description : Define. i) Streamline flow ii) Turbulent flow Give significance of Reynold’s number.

Last Answer : i) Streamline flow The flow of liquid in which every particle of liquid moves in the same direction of flow of liquid is called streamline flow. ii) Turbulent flow The flow of liquid in which every ... to 3000 liquid flow is unstable. (3)When R is greater than 3000 liquid flow is turbulent. 

Define the principles of superposition of waves.

Description : Define the principles of superposition of waves. 

Last Answer : Principle of superposition of wave: When two waves travelling through a medium arrive at a point simultaneously, each wave produces its own displacement at that point. The resultant displacement at that point is equal to the vector sum of the individual displacement of the two waves.

Define transverse wave. Give one example.

Description : Define transverse wave. Give one example.

Last Answer : Transverse waves: The wave in which direction of vibration of particles of material medium is perpendicular to the direction of propagation of wave is called transverse wave. Example: Light wave, electromagnetic waves etc.

Define the two specific heats of gas.

Description : Define the two specific heats of gas. 

Last Answer : Specific heat of a gas at constant volume - Specific heat of a gas at constant volume is defined as the amount of heat required to increase the temperature of unit mass of a gas by one degree at ... heat required to increase the temperature of unit mass of a gas by one degree at constant pressure. 

Define velocity gradient and state its unit

Description : Define velocity gradient and state its unit

Last Answer : Velocity Gradient: It is defined as the change in velocity per unit change in vertical distance of the layer from the fixed layer. Unit = per second OR 1/ sec

Define compressibility. State its SI unit.

Description : Define compressibility. State its SI unit.

Last Answer : Compressibility: The reciprocal of bulk modulus of elasticity is called as compressibility. OR The property on account of which the body can be compressed by the application of external force is called compressibility. S.I. Unit:- m2/N 

Define simple harmonic motion. Give its two example.

Description : Define simple harmonic motion. Give its two example. 

Last Answer : Simple harmonic motion: The to and fro motion of the object about its mean position is called simple harmonic motion.  Examples: motion of swing, motion of sewing machine , motion of clock pendulum , etc.

Define capillarity. Give its any two examples.

Description : Define capillarity. Give its any two examples.

Last Answer : Capillarity: - The rise or fall of a liquid inside the capillary is called as capillarity.  Examples (1) Oil rises up to the end of wick of lamp due to capillarity. (2) The water and minerals ... capillarity. (3) A blotting paper absorbs ink due to capillarity. (4) Rise of ink through pen nib.

Define amplitude and periodic time of a vibrating particle.

Description : Define amplitude and periodic time of a vibrating particle.

Last Answer : Amplitude (a):- The maximum displacement of particle from its mean position on either side is called amplitude.  Periodic time:- The time taken by a wave to complete one oscillation is called periodic time.

Define isothermal and Adiabatic process.

Description : Define isothermal and Adiabatic process.

Last Answer : Isothermal process:- The process in which volume of a gas changes keeping its temperature constant is called isothermal change.  Adiabatic process:- The process in which volume of a gas changes with change in temperature is called Adiabatic change. 

Define specific heat of a gas at constant pressure and at constant volume.

Description : Define specific heat of a gas at constant pressure and at constant volume.

Last Answer : Specific heat of a gas at constant volume:- Specific heat of a gas at constant volume is defined as the amount of heat required to increase the temperature of unit mass of a gas by one degree at ... heat required to increase the temperature of unit mass of a gas by one degree at constant pressure. 

Define absolute zero temperature and one calorie

Description : Define absolute zero temperature and one calorie

Last Answer : Absolute zero temperature:- The temperature at which both pressure and volume of gas become theoretically zero is called absolute zero temperature.  Calorie: The amount of heat is required to increase the temperature of 1gm of water by 10C is called calorie.

Define surface tension. State its S.I. unit.

Description : Define surface tension. State its S.I. unit.

Last Answer : Definition:- The force acting per unit length of an imaginary line drawn to surface of liquid.  OR  The surface tension is defined as the property of liquids by virtue of which the surface of a liquid is ... due to the tendency to contract and occupy minimum surface area.  S.I. unit :- N/m

State Hooke’s Law of elasticity. Define Elastic limit.

Description : State Hooke’s Law of elasticity. Define Elastic limit.

Last Answer : Hooke’s Law:- Within elastic limit, stress is directly proportional to strain.  Elastic limit: -It is the maximum value of the stress upto which the body shows elasticity.

Define the term i) Ultimate stress ii) Factor of safety.

Description : Define the term i) Ultimate stress ii) Factor of safety.

Last Answer : i) Ultimate Stress:- It is defined as the ratio of maximum load that the specimen (system) can withstand to original cross-sectional area of specimen.  ii) Factor of Safety:- It is defined as the ratio of ultimate stress to working stress.

What type of force acts on a car moving around a curve? (1) Centrifugal force (2) Cohesive force (3) Centripetal force (4) Gravitational force

Description : What type of force acts on a car moving around a curve? (1) Centrifugal force (2) Cohesive force (3) Centripetal force (4) Gravitational force

Last Answer : (3) Centripetal force Explanation: Any object moving in a circle (or along a circular path) experiences a centripetal force. It is this physical force that pushes or pulls the object towards ... acting upon the turned wheels of the car provides centripetal force required for circular motion.

Fat can be separated from milk in a cream separator because of _______. (1) cohesive force (2) gravitational force (3) centripetal force (4) centrifugal force

Description : Fat can be separated from milk in a cream separator because of _______. (1) cohesive force (2) gravitational force (3) centripetal force (4) centrifugal force

Last Answer : (4) centrifugal force Explanation: The centrifugal separator was invented in 1897. By the turn of the century it had altered the dairy industry by making centralized dairy processing possible for the first time.

If the cohesive force (c), is 1.5 t/m2 , the density ) of the soil is 2.0 t/m3 , factor of safety (F) is 1.5 and stability factor (Sn) is 0.05, the safe height of a slope, is (A) 5 metres (B) 8 metres (C) 10 metres (D) 12 metres

Description : If the cohesive force (c), is 1.5 t/m2 , the density ) of the soil is 2.0 t/m3 , factor of safety (F) is 1.5 and stability factor (Sn) is 0.05, the safe height of a slope, is (A) 5 metres (B) 8 metres (C) 10 metres (D) 12 metres

Last Answer : (C) 10 metres

If S, L and R are the arc length, long chord and radius of the sliding circle then the perpendicular distance of the line of the resultant cohesive force, is given by (A) a = S.R/L (B) a = L.S/R (C) a = L.R/S (D) None of these

Description : If S, L and R are the arc length, long chord and radius of the sliding circle then the perpendicular distance of the line of the resultant cohesive force, is given by (A) a = S.R/L (B) a = L.S/R (C) a = L.R/S (D) None of these

Last Answer : (A) a = S.R/L

What type of force acts on a car moving around a curve? (1) Centrifugal force (2) Cohesive force (3) Centripetal force (4) Gravitational force

Description : What type of force acts on a car moving around a curve? (1) Centrifugal force (2) Cohesive force (3) Centripetal force (4) Gravitational force

Last Answer : Centripetal force

Fat can be separated from milk in a cream separator because of: (1) Cohesive force (2) Gravitational force (3) Centripetal force (4) Centrifugal force

Description : Fat can be separated from milk in a cream separator because of: (1) Cohesive force (2) Gravitational force (3) Centripetal force (4) Centrifugal force

Last Answer : Centrifugal force

A needle or a pin floats on the surface of water because of – (1) Surface tension (2) Surface energy (3) Viscosity (4) Adhesive force

Description : A needle or a pin floats on the surface of water because of – (1) Surface tension (2) Surface energy (3) Viscosity (4) Adhesive force

Last Answer : (1) Surface tension Explanation: The pin or needle floats because of an invisible elastic skin on the surface of the water. This elastic skin is called surface tension. Surface tension of the water leads to forces strong enough to support the needle's weight.

Water drops cannot stick to the oily surface due to – (1) lack of adhesive force (2) surface tension (3) cannot mix each other (4) water is lighter than oil

Description : Water drops cannot stick to the oily surface due to – (1) lack of adhesive force (2) surface tension (3) cannot mix each other (4) water is lighter than oil

Last Answer : (2) surface tension Explanation: The separation of oil and water is caused due to the difference in surface tension of the two liquids. The water molecules stick together tightly and does not mix ... to each other very strongly, forming an invisible "skin" of surface tension around each drop.

When the steel bars are embedded in concrete. The concrete after setting, adheres to the surface of the bars and thus resist any force that tends to pull or push this road. The intensity of this adhesive force is called. (a) Bond stress (b) Shear stress (c) Compressive stress (d) All of these

Description : When the steel bars are embedded in concrete. The concrete after setting, adheres to the surface of the bars and thus resist any force that tends to pull or push this road. The intensity of this adhesive force is called. (a) Bond stress (b) Shear stress (c) Compressive stress (d) All of these

Last Answer : (a) Bond stress

A slat mould board scours better than a solid mould board because of smaller contact area resulting in a) Reduction of adhesive force b) Increase in soil pressure c) Both (a) and (b) d) None of the above

Description : A slat mould board scours better than a solid mould board because of smaller contact area resulting in a) Reduction of adhesive force b) Increase in soil pressure c) Both (a) and (b) d) None of the above

Last Answer : c) Both (a) and (b)

A needle or a pin floats on the surface of water because of (1) Surface tension (2) Surface energy (3) Viscosity (4) Adhesive force

Description : A needle or a pin floats on the surface of water because of (1) Surface tension (2) Surface energy (3) Viscosity (4) Adhesive force

Last Answer :  Surface tension

Water drops cannot stick to the oily surface due to (1) lack of adhesive force (2) surface tension (3) cannot mix each other (4) water is lighter than oil

Description : Water drops cannot stick to the oily surface due to (1) lack of adhesive force (2) surface tension (3) cannot mix each other (4) water is lighter than oil

Last Answer : surface tension

Define adhesive. Write two characteristics of Adhesive.

Description : Define adhesive. Write two characteristics of Adhesive.

Last Answer : Adhesives- Any substance which is capable of holding the materials together by surface attachment is called as an adhesive Characteristics:-  i) Adhesive should form rigid, strong and durable bond. ii ... the adhesion property on storage. v) It should be resistant to heat, chemicals and water.  

Explain stress-strain diagram for a wire under continuously increasing load.

Description : Explain stress-strain diagram for a wire under continuously increasing load.

Last Answer : A graph or diagram of stress and strain is shown as above.  OE Portion is straight line which indicates that stress is proportional to strain. Therefore the wire obeys Hooke's law upto the point ... point D is ultimate stress point. It is the max. stress the wire is capable of with standing.

What is Absolute scale of temperature?

Description : What is Absolute scale of temperature?

Last Answer : Absolute scale of temperature: It is the scale of temperature in which the lower fixed point is -2730 K and upper fixed point is 3730 K and it is then divided into 100 equal parts , each part is one degree Kelvin or degree absolute.

Distinguish between free vibrations and forced vibrations.

Description : Distinguish between free vibrations and forced vibrations. 

Last Answer : Free vibrations Forced vibrations The vibrations performed by a body when only once disturbed from its equilibrium position and vibrates with a natural frequency are called free vibrations. ... etc. Body vibrates with natural frequency. Body vibrates with external frequency.

Distinguish between transverse wave and longitudinal wave.

Description : Distinguish between transverse wave and longitudinal wave. 

Last Answer : Transverse Wave Longitudinal Waves  The wave in which direction of vibration of particles of material medium is perpendicular to the direction of propagation of wave is called transverse wave. The wave in ... travels through liquids and gases. e.q. Light wave e.q. Sound waves

State applications of conduction and radiation.

Description : State applications of conduction and radiation.

Last Answer : Applications of conduction:- 1) Bad conductor of heat is used as insulators. E.g. glass , thermo Cole , sawdust etc. 2) The calorimeters are kept in wooden box. 3) The coils of heavy duty ... . 7. Inactivation of HIV by application of heat radiations. 8. Teapots has bright shining surface.

Distinguish between streamline and turbulent flow of liquid.

Description : Distinguish between streamline and turbulent flow of liquid. 

Last Answer : Stream line flow Turbulent flow The path of every particle is same  The path of every particle is different The velocity of particle is constant in magnitude and direction The velocity of particle at each point is ... . V < vc V > vc R < 2000 R > 3000

State the effect of temperature and adulteration on viscosity of liquid.

Description : State the effect of temperature and adulteration on viscosity of liquid.

Last Answer : Temperature: The viscosity of liquid is inversely proportional to the temperature of the liquid.  Adulteration: When adulteration of soluble substance is added to the liquid its viscosity goes on increasing. 

Is the concept of "right and wrong" a universal truth or a means of keeping a naturally violence prone society cohesive?

Description : Is the concept of "right and wrong" a universal truth or a means of keeping a naturally violence prone society cohesive?

Last Answer : Here’s some fun reading.

Are the peoples of other countries more cohesive?

Description : Do people in other countries really love each other better?

Last Answer : Croatia, Slovenia and Serbia are as cohesive as Hungarians and politics affect the people. The Swiss are not together at all, they are not interested in each other. The Spaniards are kind and friendly, while the Americans are very superficial. We could say that "there is no sausage fence anywhere"

What is called the cohesive property of water?

Description : What is called the cohesive property of water?

Last Answer : This property due to the formation of hydrogen bonds between water molecules is the cause of the water molecules sticking.

What is called cohesive property of water?

Description : What is called cohesive property of water?

Last Answer : The meaning of cohesive is the the ability for sticking of water molecules.

What essential army profession characteristic emphasizes the need for energetic and dedicated professionals committed to high standards bonded together in cohesive units and organizations?

Description : What essential army profession characteristic emphasizes the need for energetic and dedicated professionals committed to high standards bonded together in cohesive units and organizations?

Last Answer : Esprit de Corps

Pick out the correct statement. (A) Plastic chips are called non-cohesive solids (B) Kick's crushing law is, P/m = K . ln (D̅sa /Ds̅b ) (C) Communition is a generic term for size enlargement operation (D) Energy required in kwh per ton of product, such that 80% of it passes through a 200 mesh screen, is called 'Work index'

Description : Pick out the correct statement. (A) Plastic chips are called non-cohesive solids (B) Kick's crushing law is, P/m = K . ln (D̅sa /Ds̅b ) (C) Communition is a generic term for size enlargement ... per ton of product, such that 80% of it passes through a 200 mesh screen, is called 'Work index'

Last Answer : (B) Kick's crushing law is, P/m = K . ln (D̅sa /Ds̅b )

__________ is a cohesive solid. (A) Wheat (B) Sand (C) Wet clay (D) None of these

Description : __________ is a cohesive solid. (A) Wheat (B) Sand (C) Wet clay (D) None of these

Last Answer : (C) Wet clay

In particular, layers have which of the following characteristics? a) Layers are by definition highly cohesive, thus satisfying the Principle of Cohesion b) Layers doesn’t support information hiding c) Layers are constrained to use only above layers d) All of the mentioned

Description : In particular, layers have which of the following characteristics? a) Layers are by definition highly cohesive, thus satisfying the Principle of Cohesion b) Layers doesn’t support information hiding c) Layers are constrained to use only above layers d) All of the mentioned

Last Answer : Layers are by definition highly cohesive, thus satisfying the Principle of Cohesion

A 300 mm square bearing plate settles by 15 mm in a plate load test on a cohesive soil when the intensity of loading is 0.2 N/mm². The settlement of a prototype shallow footing 1 m square under the same intensity of loading is (A) 15 mm (B) 30 mm (C) 50 mm (D) 167 mm

Description : A 300 mm square bearing plate settles by 15 mm in a plate load test on a cohesive soil when the intensity of loading is 0.2 N/mm². The settlement of a prototype shallow footing 1 m square under the same intensity of loading is (A) 15 mm (B) 30 mm (C) 50 mm (D) 167 mm

Last Answer : (C) 50 mm

In non-cohesive soil in passive state of plastic equilibrium (A) Major principal stress is horizontal (B) Minor principal stress is vertical (C) Major principal stress is vertical (D) Minor and major principal stresses are equally inclined to the horizontal

Description : In non-cohesive soil in passive state of plastic equilibrium (A) Major principal stress is horizontal (B) Minor principal stress is vertical (C) Major principal stress is vertical (D) Minor and major principal stresses are equally inclined to the horizontal

Last Answer : (B) Minor principal stress is vertical

Quick sand is a (A) Type of sand (B) Flow condition occurring in cohesive soils (C) Flow condition occurring in cohesion-less soils (D) Flow condition occurring in both cohesive and cohesion-less soils

Description : Quick sand is a (A) Type of sand (B) Flow condition occurring in cohesive soils (C) Flow condition occurring in cohesion-less soils (D) Flow condition occurring in both cohesive and cohesion-less soils

Last Answer : (A) Type of sand