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9. Assertion : At critical temperature, surface tension of a liquid becomes zero. Reason : At this temperature, intermolecular forces for liquids and gases become equal. Liquid can expand without any restriction.

Read the assertion and reason carefully to mark the correct option out of the options given below: (a)       If both...

8. Assertion : The concept of surface tension is held only for liquids. Reason : Surface tension does not hold for gases.

Read the assertion and reason carefully to mark the correct option out of the options given below: (a)       If both...

7. Assertion : The angle of contact of a liquid decrease with increase in temperature. Reason : With increase in temperature, the surface tension of liquid increase.

Read the assertion and reason carefully to mark the correct option out of the options given below: (a)       If both...

6. 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 contamination of the impurity.

Read the assertion and reason carefully to mark the correct option out of the options given below: (a)       If both...

5. Assertion : A large force is required to draw apart normally two glass plate5. Assertion : A large force is required to draw apart normally two glass plates enclosing a thin water film. Reason : Water works as glue and sticks two glass plates. s enclosing a thin water film. Reason : Water works as glue and sticks two glass plates.

Read the assertion and reason carefully to mark the correct option out of the options given below: (a)       If both...

46. Surface tension may be defined as

(a)  The work done per unit area in increasing the surface area of a liquid under isothermal condition (b)  The...

45. The force required to take away a flat circular plate of radius 2 cm from the surface of water, will be (the surface tension of water is 70 dyne/cm)

(a) 280  π dyne (b) 250 π dyne (c)  140 π dyne (d) 210 π dyne Ans. a (44)

2. Assertion : Spring balances show correct readings even after they had been used for a long time interval. Reason : On using for long time, spring balances losses its elastic strength.

(a)        If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)        If...

10. Assertion : Young’s modulus for a perfectly plastic body is zero. Reason : For a perfectly plastic body, restoring force is zero.

(a)        If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)        If...

9. Assertion : Two identical solid balls, one of ivory and the other of wet-clay are dropped from the same height on the floor. Both the balls will rise to same height after bouncing. Reason : Ivory and wet-clay have same elasticity.

(a)        If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)        If...

8. Assertion : The bridges declared unsafe after a long use. Reason : Elastic strength of bridges losses with time.

(a)        If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)        If...

7. Assertion : Strain is a unitless quantity. Reason : Strain is equivalent to force.

(a)        If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)        If...

6. Assertion : Bulk modulus of elasticity (K) represents incompressibility of the material. Reason : Bulk modulus of elasticity is proportional to change in pressure.

(a)        If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)        If...

5. Assertion : A hollow shaft is found to be stronger than a solid shaft made of same material. Reason : The torque required to produce a given twist in hollow cylinder is greater than that required to twist a solid cylinder of same size and material.

(a)        If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)        If...

4. Assertion : Glassy solids have sharp melting point. Reason : The bonds between the atoms of glassy solids get broken at the same temperature.

(a)        If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)        If...

3. Assertion : Steel is more elastic than rubber. Reason : Under given deforming force, steel is deformed less than rubber.

(a)        If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)        If...

1. Assertion : The stretching of a coil is determined by its shear modulus. Reason : Shear modulus change only shape of a body keeping its dimensions unchanged.

(a)        If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)        If...

44. A thread is tied slightly loose to a wire frame as in figure and the frame is dipped into a soap solution and taken out. The frame is completely covered with the film. When the portion A punctured with a pin, the thread.

(a)  Becomes concave toward A (b) Becomes convex towards A (c)  Remains in the initial position (d) Either (a) or...

43. A wooden stick 2m long is floating on the surface of water. The surface tension of water 0.07 N/m. By putting soap solution on one side of the sticks the surface tension is reduced to 0.06 N/m. The net force on the stick will

(a)  0.07 N (b)  0.06 N (c)   0.01 N (d)  0.02 N Ans. d (15)

42. The dimensions of surface tension are

(a) MLT-1 (b) ML2 T-2 (c) ML0 T-2 (d) ML-1T-2 Ans. c   (10)

41. The property utilized in the manufacture of lead shots is

(a)  Specific weight of liquid lead (b)  Specific gravity of liquid lead (c)   Compressibility of liquid lead (d)  Surface tension...

40. Cohesive force is experienced between

(a)  Magnetic substances (b)  Molecules of different substances (c)   Molecules of same substances (d)  None of these Ans. (c)           The...

39. Oil spreads over the surface of water whereas water does not spread over the surface of the oil, due to

(a)  Surface tension of water is very high (b)  Surface tension of water is very low (c)   Viscosity of oil...

38. The force required to separate two glass plates of area

The force required to separate two glass plates of area 10-2m2 with a film of water 0.05 mm thick between...

37. Due to which property of water, tiny particles of camphor dance on the surface of water

(a)  Viscosity (b)  Surface tension (c)   Weight (d)  Floating force Ans. b (13)

36. It is easy to wash clothes in hot water because its

(a) Surface tension is more (b)  Surface tension is less (c) Consumes less soap (d) None of these Ans. (b)         ...

35. A 10 cm long wire is placed horizontally on the

A 10 cm long wire is placed horizontally on the surface of water and is gently pulled up with a...

34. A thin metal disc of radius r floats on water surface and bends the surface downwards along the perimeter making an angle θ with vertical edge of the disc. If the disc displaces a weight of water W and surface tension of water is T, then the weight of metal disc is

(a)    2πrT + W (b)  2πrT COSθ – W (c) 2πrT COSθ +W (d) W-2πrT COSθ Ans. c (12)

33. Small liquid drops assume spherical shape because

(a)  Atmospheric pressure exerts a force on a liquid drop (b)  Volume of a spherical drop is minimum (c)   Gravitational...

32. Two pieces of glass plate one upon the other with a little water in between them cannot be separated easily because of

(a)  Inertia (b)  Pressure (c)   Surface tension (d)  Viscosity Ans. (c)  Surface tension pulls the plates towards each other. (7)

8. An elastic material of Young’s modulus Y is subjected to a stress S. The elastic energy stored per unit volume of the material is

(a)   2Y/S2                                     ...

7.A particle of mass m is under the influence of a force F which varies with the displacement x according to the relation

A particle of mass m is under the influence of a force F which varies with the displacement x according...

29. Mercury does not wet glass, wood or iron because

(a)  Cohesive force is less than adhesive force (b)  Cohesive force is greater than adhesive force (c)   Angle of contact...

6. 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 ratio of extension produced in the wires by applying same load will be

(a)   1 : 1                                         (b)   2 : 1 (c)   1 : 2                                         (d)   4 : 1 Answer-d (5)

5. One end of a uniform wire of length L and of weight W is attached rigidly to a point in the roof and a weight is suspended from its lower end. If S is the area of cross-section of the wire, the stress in the wire at a height 3L/4 from its lower end is

(a)   W1/S                                     ...

4. The extension in a string obeying Hooke’s law is x. The speed of sound in the stretched string is v. If the extension in the string is increased to 1.5x, the speed of sound will be

(a)       1.22 v                                              (b)   0.61 v (c)   1.50 v                       ...

3. Two rods of different materials having coefficients of linear expansion

3. Two rods of different materials having coefficients of linear expansion α1,α2 and Young’s moduli  Y1 and Y2 respectively are...

31. When a drop of water is dropped on oil surface, then

(a)  It will mix up with oil (b)  It spreads in the form of a film (c)   It will deform...

2. To break a wire, a force of

2. To break a wire, a force of 106 N/m2 is required. If the density of the material is 3×103...

30. Surface tension of a liquid is found to be influenced by

(a)  It increases with the increase of temperature (b)  Nature of the liquid in contact (c)   Presence of soap that...

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