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MCQ for Full Syllabus Physics Properties of Liquid of Solid
Full Syllabus Physics students should refer to the following multiple-choice questions with answers for Properties of Liquid of Solid in Full Syllabus.
Properties of Liquid of Solid MCQ Questions Full Syllabus Physics with Answers
Surface tension of a liquid is measured by the force acting per unit length on either side of an imaginary line drawn on the free surface of liquid, the direction of this force being perpendicular to the line and tangential to the free surface of liquid. So if F is the force acting on one side of imaginary line of length l. then T = Fl.
1. It depends only on the nature of liquid and is independent of the area of surface or length of line considered.
2. It is a scalar as it has a unique direction which is not to be specified.
3. Dimension M1 L0 T-2
4. Unit : N/m (SI)
5. It is a molecular phenomenon and its root cause is the electromagnetic forces.
Force Due to Surface Tension
If a body of weight W is placed on the liquid surface, whose surface tension is T, and if F is the minimum force required to pull it away from the water then value of F for different bodies can be calculated by the following table.
Body Force
Examples of Surface Tension :
1. When mercury is split on a clean glass plate, it forms globules. Tiny globules are spherical on the account of surface tension because force of gravity is negligible. The bigger globules because force of gravity is negligible. The bigger globules get plattened from the middle but have round shape near the edges.
2. When a molten metal is poured into water from a suitable height, the falling stream of metal breaks up and the detached portion of the liquid in small quantity acquire the spherical shape.
3. Rain drops are spherical in shape because each drop tends to acquire minimum surface area due to surface tension, and for a given volume, the surface area of sphere is minimum.
4. Oil drop spreads on cold water. Whereas it may remain as a drop on hot water. This is due to the fact that the surface tension of oil is less than that of cold water and is more than that of hot water.
5. If a small irregular piece of camphor is floated on the surface of pure water, it does not remain steady but dances about on the surface. This is because, irregular shaped camphor dissolves unequally and decreases the surface tension of the water locally. The unbalanced forces make it to move haphazardly
in different directions.
6. Take a frame of wire and dip it in soap solution and take it out, a soap film will be formed in the frame. Place a loop of wet thread gently on the film. It will remain in the form, we place it on the film according to figure.
Now, piercing the film with a pin at any point inside the loop, It immediately takes the circular from as shown in figure.
7. When a greased iron needle is placed genetly on the surface of water at rest, so that it does not prick the water surface, the needle floats on the surface of water despite it being heavier because the weight of needle is balanced by the vertical components of the forces of surface tension. If the water surface is pricked by one end of the needle, the needle sinks down.
8. Hair of shaving brush / painting brush when dipped in water spread out, but as soon as it is taken out, its hair stick together.
Factors affecting surface tension
1. Temperature :
The surface tension of liquid decreases with rise of temperature. The surface tension of liquid is zero at its boiling point and it vanishes at critical temperature. At critical temperature, intermolecular forces for liquid and gases becomes equal and liquid can expand without any restriction. For small temperature differences, the variation in surface tenstion with temperature is linear and is given by the relation.
16. A and B are two wires. The radius of A is twice that of B. They are stretched by the same load. Then what is the stress on B ?
(A) Equal to that on A (B) Four times that on A
(C) Two times that on A (D) Half that on A
17. If the length of wire is reduced to half then it can hold the____load.
(A) Half (B) Same (C) Double (D) One fourth
18. There are two wires of same material and same length. While the diameter of second wire is 2 times, the diameter of first wire. Then what will be the ratio of extension produced in the wire by applying same load ?
(A) 1 : 1 (B) 2 : 1 (C) 1 : 2 (D) 4 : 1
106. Mark the wrong statement.
(A) Sliding of moleculawr layer is much easier than compression or expansion.
(B) Receiprocal of bulk modulus is called compressibility.
(C) Twist is difficult in big rod as compared to small rod.
(D) Which is more strong out of hollow and solid cylinder having equal length and mass ?
107. A 2m long rod of radius 1 cm which is fixed from one end is gien a twist of 0.8 radians. What will be the shear strain developed ?
(A) 0.002 (B) 0.004 (C) 0.008 (D) 0.016
108. Shearing stress causes change in
(A) length (B) breadth (C) shape (D) volume
Assertion and Reason :
Read the assertion and reason carefully to mark the correct option out of the option given below
(A) If both assertion and reason are true and reason is the correct explanation of the assertion.
(B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(C) If assertion is true but reason is false.
(D) If assertion and reason both are false.
166. In capilley pressure below the curved surface at water will be
(A) Equal to atomospheric (B) Equal to upper side pressure
(C) More than upper side pressure (D) Lesser than upper side pressure
167. Two bubbles A and B (A>B) are joined through a narrow tube than
(A) The size of a will increase
(B) The size of B will increase
(C) The size of B will increase untill thenpressure equals
(D) None of these
168. If the excess pressure inside a soap bubble is balanced by oil column of height 2 mm then the surface tension of soap solution will be. Cr = 1 and density d = 0.8 gm/cc)
Capillarity
169. A capillary tube at radius R is immersed in water and water rises in it to a height H. Mass of water in the capillary tube is M. If the radius of the tube is doubled. Mass of water that will rise in the capillary tube will now be
(A) M (B) 2M (C) (D) 4M
181. After the drop detaches its surface energy is
(A) 1.4 × 10-6 J (B) 2.7 × 10-6 J (C) 5.4 × 10-6 J (D) 8.1 × 10-6 J
Assertion & Reason type questions
Read the assertion and reason carefully and mark the correct option given below.
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c) If assertion is true but reason is false.
(d) If the assertion and reason both are false.
182. Assertion : It is better to wash the clothes in cold soap solution.
Reason : The surface tension of cold solution is more then the surface tension of hot solution.
(A) a (B) b (C) c (D) d
183. Assertion : When height of a tube is less then liquid rise in the capillary tube the liquid does not overtow.
Reason : Product of radius of meniscus and height of liquid incapilling tube always remains constant.
(A) a (B) b (C) c (D) d
184. Assertion : The impurities always decrease the surface tension of a liquid.
Reason : The change in surface tension of the liquid depends upon the degree of cont amination of the impurity.
(A) a (B) b (C) c (D) d
185. Assertion : The concept of surface tension is help only for liquids.
Reason : Surface tension does not hold for gases.
(A) a (B) b (C) c (D) d
186. Assertion : The water rises higher in a capillary tube of small diametre than in the capillary tube of large diamtre.
Reason : Height through which liquid rises in a capillay tube is inversely proportional to the diameter of the capillary tube.
(A) a (B) b (C) c (D) d
187. Assertion : Tiny drops of liquid resist deforming forces better than bigger drops.
Reason : Excess pressure inside a drop is directly proportional to surface tension.
(A) a (B) b (C) c (D) d
Pressure and Density
188. When a large bubble rises drom the bottom of a lake to the surface. Its radius double S. It atmospheric pressure in euqal to that of colurnn of colurnn of water height H then the depth of Lake is
(A) H (B) 2H (C) 7H (D) 8H
Assertion & Reason type questions
Read the assertion and reason carefully to mark the correct option out of the options given below
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c) If assertion is true but reason is false.
(d) IF the assertion and reason are false.
(e) If assertion is flase but reason is true.
215. Assertion : The blood pressure in humans is greater at the feet than at the brain.
Reason : Pressure of liquid at any point is proportional to height clensity of liquid.
(A) a (B) b (C) c (D) d
216. Assertion : To empty an oil tank two holes so it will made.
Reason : Oil will come out of two holes so it will be emptied faster.
(A) a (B) b (C) c (D) d
217. Assertion : A bubble comes from the bottom of a lake to the top.
Reason : Its radius increases.
(A) a (B) b (C) c (D) d
Ordinary Thinking
Thermometary
218. Oxygen boils at 183°C. This temperature is approximately.
(A) 215° F (B) -297° F (C) 329° F (D) 361° F
Calorimetry
229. Melting point of ice ____
(A) Increases with increasing pressure (B) Decreases with increasing pressure
(C) Is independent of pressure (D) is proportional of pressure
230. Amount of heat required to raise the temprature of a body through 1k is called it is
(A) Water equivalent (B) Thermal capacity
(C) Entropy (D) Specific heat
231. A vessel contains 110 g of water the heat capacity of the vessel is equal to 10 g of water The initical temprature of water in vessel is 10°C If 220 g of hot water at 70°C is poured in the vessel the Final temperature meglecting radiation loss will be
(A) 70° C (B) 80° C (C) 60° C (D) 50° C
232. In a water fall the water falls from a height of 100 cm. If the entire K.E. of water is converted in to heat the rise in temperature of water will be
(A) 0.23° C (B) 0.46° C (C) 2.3° C (D) 0.023°C
233. The temprature at which the vapour pressure of a liquid becomes equals of the external pressure is its.
(A) Melting point (B) sublimation point
(C) Critical temprature (D) Boiling point
234. 10 g of ice at 00C is mixed with 100 g of water at 50° C what is the resultant temprature of mixture.
(A) 31.2° C (B) 32.8° C (C) 36.7° C (D) 38.2° C
Critical Thinking
235. Two metal strips that constituate a thermostant must necessarily in their
(A) Mass (B) Length
(C) Resistivity (D) Coefficient of liner expansion
236. 2 kg of Ice at -20° C is mixed with 5 kg of water at 20° C in an insulating vessel having a megligible heat capacity calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice care 1 keal/kg per°C and 0.5 Keal/kg 1°C while the latent heat of fusion of ice is 80 kcoil/kg.
(A) 7 kg (B) 6 kg (C) 4 kg (D) 2 kg
237. A lead bullet at 27° C just melts when stopped by an obstancle Assuming that 25% of heat is obsorbed by the obstacle then the velocity of the bullet at the time of striking.
[M.P. of lead = 327° C, specific heat of lead = 0.03 cal/x latent heat of fusion of lead = 6 cal/g and J = 4.2 Jute / cal]
(A) 410 m/s (B) 1230 m/s (C) 307.5 m/s (D) None of these
238. An electric kettle takes 4A current at 220V How much time will it take to boil 1 kg of water from temprature 2°C ? The temprature of boiling water is 10° C.
(A) 12.6 min (B) 4.2 min
(C) 6.3 min (D) 8.4 min
Assertion & Reason
Read the assertion and reason carefully to mark the correct option out of the option given below.
(a) If both asseration and reason are true and the reason is the correct explanation of the reason.
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c) If assertion is true but reason is false.
(d) If the assertion and reason both are false.
(e) If assertion is false but reason is true.
241. Assertion : The melting point of the ice decreases with increases pressure
Reason : Ice contracts on melting
(A) a (B) b (C) c (D) d
242. Assertion : Fahrenheit is the smallest unit measuring temprature.
Reason : Fahrenheit was the first temprature scale used for measuring temprature.
(A) a (B) b (C) c (D) d
243. Assertion : Melting of solid causes no change in internal energy.
Reason :Latent heat is the heat required melt a unit mass of solid.
(A) a (B) b (C) c (D) d
244. Assertion : Specific heat capacity is the cause of formation of land and sea breeze.
Reason : The specific heat of water is more then land.
(A) a (B) b (C) c (D) d
245. Assertion : The moleculs of 0°C ice and 0°C water will have same potential energy.
Reason : Potential energy depends only on temprature of the system.
(A) a (B) b (C) c (D) d
246. Assertion : A beaker is completely filled with water at 4°C. It will overflow both where heated or cooled.
Reason : There is expansion of water below and above 4°C.
(A) a (B) b (C) c (D) d
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MCQs for Properties of Liquid of Solid Physics Full Syllabus
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