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18. The points of maximum and minimum attraction in the curve between potential energy (U) and distance (r)of a diatomic molecules are respectively

(a)   Sand R (b)   T and S (c)   R and S (d)   S and T Answer-d

14. The diagram shows stress v/s strain curve for the materials A and B. From the curves we infer that

(a)   A is brittle but B is ductile              (b)   A is ductile and B is brittle (c)   Both A...

8. Two capillaries made of same material but of different radii are dipped in a liquid. The rise of liquid in one capillary is 2.2 cm and that in the other is 6.6 cm. The ratio of their radii is

(a)  9 : 1 (b)  1 : 9 (c)   3 : 1 (d)  1 : 3 Ans. c

7. Two capillary tubes P and Q are dipped in water. The height of water level in capillary P is 2/3 to the height in Q capillary. The ratio of their diameters is

(a)  2 : 3 (b)  3 : 2 (c)   3 : 4 (d)  4 : 3 Ans. b

1. If pressure at half the depth of a lake is equal to 2/3 pressure at the bottom of the lake then what is the depth of the lake

(a)  10 m                                                (b)   20 m (c)   60 m                       ...

17. A student plots a graph from his reading on the determination of Young’s modulus of a metal wire but forgets to label. The quantities on X and Y axes may be respectively

(a)  Weight hung and length increased (b)   Stress applied and length increased (c)   Stress applied and strain developed (d)   Length...

16. The diagram shows the change x in the length of a thin uniform wire caused by the application of stress F at two different temperatures

16. The diagram shows the change x in the length of a thin uniform wire caused by the application of...

15. Which one of the following is the Young’s modulus (in N/m2) for the wire having the stress-strain curve shown in the figure

(a)  9×1011 (b)  8×1011 (c) 10×1011 (d)  2×1011 Answer-d      

6. It is not possible to write directly on blotting paper or newspaper with ink pen

(a)   Because of viscosity (b)  Because of inertia (c)   Because of friction (d)  Because of capillarity Ans. d

12. The potential energy U between two molecules as a function of the distance X between them has been shown in the figure. The two molecules are

(a)  Attracted when x lies between A and B and are repelled when X lies between B and C (b)  ...

11. The graph shows the behaviour of a length of wire in the region for which the substance obeys Hook’s law. P and Q represent

(a)   P = applied force, Q = extension (b)   P = extension, Q = applied force (c)   P = extension,...

2. A large number of water drops each of radius r combine to have a drop of radius R. If the surface tension is T and the mechanical equivalent of heat is J, then the rise in temperature will be

(a)     2T/rJ (b)    3T/RJ (c)    3T/J[(1/R )-(1/R)] (d)   2T/J[(1/r)-(1/R)] Ans. c

6. The diagram shows a force-extension graph for a rubber band. Consider the following statementsI. It will be easier to compress this rubber than expand it II. Rubber does not return to its original length after it is stretched III. The rubber band will get heated if it is stretched and released Which of these can be deduced from the graph

(a)   III only                                   (b)   II and III (c)   I and III                                  (d)   I only Explanation-a

5. The strain-stress curves of three wires of different materials are shown in the figure. P, Q and R are the elastic limits of the wires. The figure shows that

(a)   Elasticity of wire P is maximum (b)   Elasticity of wire Q is maximum (c)   Tensile strength of R is...

1. There is a horizontal film of soap solution. On it a thread is placed in the form of a loop. The film is pierced inside the loop and the thread becomes a circular loop of radius R. If the surface tension of the loop be T, then what will be the tension in the thread

(a)   πR2/T (b)   πR2T (c)   2πRT (d)   2RT Ans. d

2. Due to capillary action, a liquid will rise in a tube, if the angle of contact is

(a)   Acute (b)  Obtuse (c)   90° (d)  Zero Ans.  a

1. When two capillary tubes of different diameters are dipped vertically, the rise of the liquid is

(a)  Same in both the tubes (b)  More in the tube of larger diameter (c)   Less in the tube of...

4. In a surface tension experiment with a capillary tube water rises upto 0.1 m. If the same experiment is repeated on an artificial satellite, which is revolving around the earth, water will rise in the capillary tube upto a height of

(a)   0.1 m                                         (b)  0.2 m (c)   0.98 m (d)  Full length of the capillary tube Ans. (d)   In the...

3. An air bubble in a water tank rises from the bottom to the top. Which of the following statements are true

(a)  Bubble rises upwards because pressure at the bottom is less than that at the top. (b)  Bubble rises upwards...

9. The adjacent graph shows the extension

The adjacent graph shows the extension (Δl) of a wire of length 1m suspended from the top of a roof...

8. The load versus elongation graph for four wires of the same material is shown in the figure. The thickest wire is represented by the line

(a)   OD (b)   OC (c)   OB (d)   OA Answer-a

13. The value of force constant between the applied elastic force F and displacement will be

(a)  √3 (b)     1/√3 (c)     1/2 (d)      √3/2 Answer-b

7. The stress versus strain graphs for wires of two materials A and B are as shown in the figure.

The stress versus strain graphs for wires of two materials A and B are as shown in the figure. If...

2. Assertion : It is better to wash the clothes in cold soap solution. Reason : The surface tension of cold solution is more than the surface tension of hot solution.

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

3. In the above graph, point B indicates

(a) Breaking point                             (b)   Limiting point (c)   Yield point                       ...

2. A graph is shown between stress and strain for a metal. The part in which Hooke’s law holds good is

(a)  OA                (b)   AB (c)   BC                                                         (d)   CD Answer-a

3. Which graph represents the variation of surface tension with temperature over small temperature ranges for water

Ans. b

1. The graph shown was obtained from experimental measurements of the period of oscillations T for different masses M placed in the scale pan on the lower end of the spring balance. The most likely reason for the line not passing through the origin is that the

(a)  Spring did not obey Hooke’s Law (b)   Amplitude of the oscillations was too large (c)   Clock used needed regulating...

2. A soap bubble is blown with the help of a mechanical pump at the mouth of a tube. The pump produces a certain increase per minute in the volume of the bubble, irrespective of its internal pressure. The graph between the pressure inside the soap bubble and time t will be-

Ans. a

1. The correct curve between the height or depression h of liquid in a capillary tube and its radius is

Ans. b

12. Assertion : Sterss is the internal force per unit area of a body. Reason : Rubber is less elastic than steel.

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

11. Assertion : Identical springs of steel and copper are equally stretched. More work will be done on the steel spring. Reason : Steel is more elastic than copper.

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

4. Assertion : A needle placed carefully on the surface of water may float, whereas a ball of the same material will always sink. Reason : The buoyancy of an object depends both on the material and shape of the object.

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

14. Assertion : The shape of a liquid drop is spherical. Reason : The pressure inside the drop is greater than that of outside.

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

13. Assertion : Hot soup tastes better than the cold soup. Reason : Hot soup has high surface tension and it does not spread properly on our tongue.

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

3. Assertion : When height of a tube is less than liquid rise in the capillary tube, the liquid does not overflow. Reason : Product of radius of meniscus and height of liquid in capillary tube always remains constant.

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

1. Assertion : It is easier to spray water in which some soap is dissolved. Reason : Soap is easier to spread.

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

12. Assertion : The water rises higher in a capillary tube of small diameter than in the capillary tube of large diameter. Reason : Height through which liquid rises in a capillary tube is inversely proportional to the diameter of the capillary tube.

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

11. Assertion : Tiny drops of liquid resist deforming forces better than bigger drops. Reason : Excess pressure inside a drop is directly proportional to surface tension.

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

10. Assertion : A large soap bubble expands while a small bubble shrinks, when they are connected to each other by a capillary tube. Reason : The excess pressure inside bubble (or drop) is inversely proportional to the radius.

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

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