Brand new Course Package released! Get 99% off your first purchase with code “99”. Find out more!
Back
0

Shopping cart

Close

No products in the cart.

June 2022

Home2022JunePage 7

25. Three liquids of densities and are mixed in equal volumes. Then the density of the mixture is

(a)  d                                     ...

7. If the surface tension of a soap solution is 0.03 MKS units, then the excess of pressure inside a soap bubble of diameter 6 mm over the atmospheric pressure will be

(a) Less than 40 N/m2                             (b) Greater than 40 N/m2 (c)   Less than 20 N/m2                  (d) Greater than 20 N/m2...

8. The excess of pressure inside a soap bubble than that of the outer pressure is

(a)  2T/r (b)  4T/r (c)  T/2r (d) T/r Ans. b (6)

14. When a large bubble rises from the bottom of a lake to the surface, its radius doubles. If atmospheric pressure is equal to that of column of water height H, then the depth of lake is

(a)      H     (b)   2H (c)   7H                                      (d)  8H Ans. c (3)

13. The adjoining diagram shows three soap bubbles

A, B and C prepared by blowing the capillary tube fitted with stop cocks, S1, S2 and S3. With stop...

12. The radii of two soap bubbles

are r1 and r2. In isothermal conditions, two meet together in vaccum. Then the radius of the resultant bubble is...

11. A capillary tube of radius r is dipped in a liquid of density ρ and surface tension S. If the angle of contact is θ, the pressure difference between the two surfaces in the beaker and the capillary

(a)(S/r) cos θ (b) (2S/r) cos θ (c)  S/r cos θ (d)  2S/r cos θ Ans. b (8)

10. Pressure inside two soap bubbles are 1.01 and 1.02 atmospheres. Ratio between their volumes is

(a)   102 : 101 (b)  (102)3 : (101)3 (c)   8 : 1 (d)  2 : 1 Ans. c (27)

17. Excess pressure of one soap bubble is four times more than the other. Then the ratio of volume of first bubble to another one is

(a)  1 : 64 (b)  1 : 4 (c)   64 : 1 (d)  1 : 2 Ans. a (9)

16. The volume of an air bubble becomes three times as it rises from the bottom of a lake to its surface. Assuming atmospheric pressure to be 75 cm of Hg and the density of water to be 1/10 of the density of mercury, the depth of the lake is

(a)  5 m                                     (b) 10 m (c) 15 m                                          (d) 20 m Ans. c (13)

15. A soap bubble in vacuum has a radius of 3 cm and another soap bubble in vacuum has a radius of 4 cm. If the two bubbles coalesce under isothermal condition, then the radius of the new bubble is

(a)  2.3 cm                                        (b)  4.5 cm (c)   5 cm                                   (d) 7 cm Ans. c (41)

27. From the adjacent figure, the correct observation is

(a)  The pressure on the bottom of tank (a) is greater than at the bottom of (b). (b)   The pressure...

30. Air is blown through a hole on a closed pipe containing liquid. Then the pressure will

(a)   Increase on sides (b)   Increase downwards (c)   Increase in all directions (d)   Never increases Answer-c (6)

21. A spherical drop of water has radius 1 mm If surface tension of

water is 70 x 10-3 N/m difference of pressures between inside and out side of the spherical drop is (a) ...

8. A silver ingot weighing 2.1 kg is held by a string so as to be completely immersed in a liquid of relative density 0.8. The relative density of silver is 10.5. The tension in the string in kg-wt is

(a)   1.6                                     ...

9. A sample of metal weighs 210 gm in air, 180 gm in water and 120 gm in liquid. Then relative density (RD) of

(a)   Metal is 3                                       (b)   Metal is 7 (c)   Liquid is 3                 ...

13. A block of steel of size 5 cm × 5 cm × 5 cm is weighed in water. If the relative density of steel is 7, its apparent weight is

(a)   6 × 5 × 5 × 5 gf                              (b)   4 × 4 × 4 × 7 gf (c)   5...

14. A body is just floating on the surface of a liquid. The density of the body is same as that of the liquid. The body is slightly pushed down. What will happen to the body

(a)   It will slowly come back to its earlier position (b)   It will remain submerged, where it is left (c)  ...

5. A mercury drop does not spread on a glass plate because the angle of contact between glass and mercury is

(a)      Acute (b)  Obtuse (c)   Zero (d) 900 Ans. b (9)

4. The angle of contact between glass and mercury is

(a)      0° (b)    30o (c)   90o                                                        (d)  135o Ans. d (6)

3. When the temperature is increased the angle of contact of a liquid

(a)  Increases (b)  Decreases (c)   Remains the same (d)  First increases and then decreases Ans. b (8)

2. The meniscus of mercury in the capillary tube is

(a)  Convex (b)  Concave (c)   Plane (d)  Uncertain Ans. a (4)

1. A liquid does not wet the sides of a solid, if the angle of contact is

(a)  Zero (b)  Obtuse (More than 90°) (c)   Acute (Less than 90°) (d)  90° Ans. b (9)

30. The excess pressure in a soap bubble is thrice that in other one. Then the ratio of their volume is

(a)  1 : 3 (b)  1 : 9 (c)   27 : 1 (d)  1 : 27 Ans. d (5)

29. In Jager’s method, at the time of bursting of the bubble

(a)  The internal pressure of the bubble is always greater than external pressure (b)  The internal pressure of the bubble...

16. A solid sphere of density

η ( > 1) times lighter than water is suspended in a water tank by a string tied to its base...

28. 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 (r = 1 cm and density d = 0.8 gm/cc)

(a)  3.9 N/m (b)  3.9 ×10­–2 N/m (c) 3.9 ×10­–3 N/m (d) 3.9 dyne/m Ans. b (5)

27. Two soap bubbles have different radii but their surface tension is the same. Mark the correct statement

(a)  Internal pressure of the smaller bubble is higher than the internal pressure of the larger bubble (b) Pressure of...

26. Two bubbles A and B (A>B) are joined through a narrow tube. Then

(a)  The size of A will increase (b)  The size of B will increase (c)   The size of B will...

24. Two soap bubbles of radii

r1 and r2 equal to 4 cm and 5 cm are touching each other over a common surface s1s2 (shown...

15. A cork is submerged in water by a spring attached to the bottom of a bowl. When the bowl is kept in an elevator moving with acceleration downwards, the length of spring

(a)  Increases                                       (b)   Decreases (c)   Remains unchanged                 (d)   None of these Answer-b  ...

25. The pressure inside a small air bubble of

radius 0.1 mm situated just below the surface of water will be equal to [Take surface tension of water 70...

12. Pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid and the walls of the containing vessel. This law was first formulated by

(a)   Bernoulli                                        (b)   Archimedes (c)   Boyle                             ...

11. The fraction of a floating object of volume

v0  and density d0  above the surface of a liquid of density d will be (a)   d0 /d     ...

10. Two solids A and B float in water. It is observed that A floats with half its volume immersed and B floats with 2/3 of its volume immersed. Compare the densities of A and B

(a)   4 : 3                                 ...

23. In capillary pressure below the curved surface of water will be

(a)  Equal to atmospheric (b)  Equal to upper side pressure (c)   More than upper side pressure (d)  Lesser than upper...

22. The pressure at the bottom of a tank containing a liquid does not depend on

(a)  Acceleration due to gravity (b)  Height of the liquid column (c)   Area of the bottom surface (d)  Nature of...

7. A cubical block is floating in a liquid with half of its volume immersed in the liquid. When the whole system accelerates upwards with acceleration of g/3, the fraction of volume immersed in the liquid will be

(a)   1/2 (b)   3/8 (c)   2/3 (d)   3/4 Answer-a (28)

6. A metallic block of density

5 gm cm–3 and having dimensions 5 cm × 5 cm × 5 cm is weighed in water. Its apparent...

5. A concrete sphere of radius R has a cavity of radius r which is packed with sawdust. The specific gravities of concrete and sawdust are respectively 2.4 and 0.3 for this sphere to float with its entire volume submerged under water. Ratio of mass of concrete to mass of sawdust will be

(a)   8                                     ...

Popular posts

Haryana Police Recruitment Group C & D Vacancies & Coaching | Haryana CET Based Preparation
NEET 2026 FAQ – Syllabus, Exam Date, Preparation Tips & Course (Flame Institute)
SSC GD 2026, Notification, Apply Online, Vacancy, Eligibility, Exam Date, Syllabus, Online Form, Age Limit, PET/PST, Selection Process

Sign up to receive latest updates

Get in touch

Call us directly?

9888949978

Address

Flame Institute SCF 18 Near Chawla Lights Phase 7 Mohali

Email

FlameInstitute@gmail.com
Need some help?
Popular subjects
Need some help?

Youtube

2,3M Subribe

Facebook

2,3M Subribe

Instagram

2,3M Subribe

Twitter

2,3M Subribe
  • © 2025 Flame Institute.All rights reserved.
English
USD
error: Content is protected !!
Courses
Search

Search

    ArticlesCart