2022Flame Institute

28. What is molarity of a solution of HCl which contains 49% by weight of solute and whose specific gravity is 1.41

a. 15.25 b. 16.75 c. 18.92 d. 20.08 Ans. c (38)

27. Concentration aqueous solution sulphuric acid 98%

H2 SO4 by mass and has a density of 1.80 g.mL-1 . Volume of acid required to make 1 litre of 0.1 M H2 SO4 solution. a. 11.10 mL b. 16.65 mL c. 22.20mL d. 5.55 mL Ans. d (44)

26. The density of a 3M sodium thiosulphate solution is 1.25 g.mL. Calculate the precent by weight of sodium thiosulphate

a. 12. 64 % b. 37. 92% c. 0.87% d. 63.21% Ans. b (7)

25. Which of the following should be done in order to prepare 0.40M NaCl starting with 100 mL of 0.30 M NaCl

a. Add 0.585 g NaCl b. Add 20 mL water c. Add 0.010 mL NaCl d. Evaporate 10 mC water Ans. a (5)

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 (b) S2/2Y (c) S/2Y …

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 to the relation F= -kx+Fº in which k and Fº are constants. The particle when disturbed will oscillate (a) about …

24. 3.0 molal NaOH solution has a density of 1.110 g/mL. The molarity of the solution is

a. 3.0504 b. 3.64 c. 3.o5 d. 2. 9732 Ans. d (6)

23. 25mL of a solution of barium hydroxide on titration with a 0.1 molar solution of hydrochloric acid gave a titre value of 35 mL. The molarity of the solution is

a. 0.07 b. 0. 14 c. 0. 28 d. 0.35 Ans. a (3)

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 is less than 90o (d) Cohesive force is equal to adhesive force Ans. b (28)

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 (3)

22. Which statement is true for solution of 0.020

M H2 SO4 a. 2 litre of the solution contains 0.020 mole of SO42- b. 2 litre of the solution contains 0.080 mole of H3 O+ c. 1 litre of the solution contains 0.020 moleH3 O+ d. None of these …

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 (b) W1 +(W/4) / S (c) W1+(3W/4) / S (d) (W1+W)/S Answer-c …

21. If 5.85 g of NaCl is dissolved in water and the solution is made up to 0.5 litre, the molarity of the solution will be

a. 0.2 b. 0.4 c. 1.0 d. 0.1 Ans.a (14)

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 (d) 0.75 v Answer-a (7)

20. 20mL of HCl solution requires 19.85 mL of 0.01 M NaOH solution for complete neutralization. The molarity of HCl solution is

a. 0.0099 b. 0.099 c. 0.99 d. 9.9 Ans. a (49)

19. 8.50 g of

NH3 is present in 250 mL volume. Its active mass is a. 1.0 mL-1 b. 0.5 mL-1 c. 1.5 mL-1 d. 2.0 mL-1 Ans. d (2)

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 fixed between two rigid massive walls. The rods are heated such that they undergo the same increase in temperature. There …

18. How many grams of glucose be dissolved to make one litre solution of 10% glucose

a. 100 g b. 180 g c. 18 g d. 1.8 g Ans. a Explanation : 1og. of glucose is presnt in 100 mL of solution So 100 g of glucose is present in 1000 mL of solution (14)

17. In which ration of volumes 0.4 M HCl and 0.9 N=M HCl are to be mixed such that the concentration of the resultant solution becomes 0.7 M

a. 4:9 b. 2:3 c. 3:2 d. 1:1 Ans. b (8)

16. Dissolving 120 g of urea in 1000g of water gave a solution of density 1.15g/mL. The molarity of the solution is

a. 1.78 M b. 2.00 M c. 2.05 M d. 2.22 M Ans. c (9)

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 (d) It remains spherical Ans. d (11)

15. The molarity of a solution obtained by mixing 800 mL of 0.5 M HCl with 200 mL of 1 M HCl will be

a. 0.8 M b. 0.6 M c. 0.4 M d. 0.2 M Ans. b (8)

14. For converting a solution if 100 mL KCl of 0.4 M concenrtration into a solution of KCl o.05 M concentration. The quantity of water added is

a. 900 mL b. 700 mL c. 500 mL d. 300 mL Ans. b (40)

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 Kg/cm3 , then the length of the wire which will break by its own weight will be (a) 34 m …

13. What is the molarity of

H2 SO4 solution that has a density 1.84 g/cc at 35° C and contains solute 98% by weight a. 4.18 M b. 8.14 M c. 18.4 M d. 18 M Ans. c (12)

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 increases it (d) Its variation with the concentration of the liquid Ans. d (12)

12. 40% by weight solution will contain how much mass of the solute in 1 L solution, density of the soltution is 1.2g/mL

a. 480 g b. 48 g c. 38 g d. 380 g Ans. a (6)

1. An Indian rubber cord L metre long and area of cross-section

An Indian rubber cord L metre long and area of cross-section A metre 2 is suspended vertically. Density of rubber is D Kg/metre 3 and Young’s modulus of rubber is E newton/metre 2 . If the wire extends by l metre under …

11. 6.02 x

10 20 molecules of urea are present in 100 mL of its solution. The concetration of urea solution is a. o.02 M b. 0.01 M c. 0.001 M d. 0.1 M Ans. b (3)

28. If a glass rod is dipped in mercury and withdrawn out, the mercury does not wet the rod because

(a) Angle of contact is acute (b) Cohesion force is more (c) Adhesion force is more (d) Density of mercury is more Ans. b (11)

10. The concentration of an aqueous solution of 0.01M

CH3 OH solution is very nearly equal to which of the following . a. 0.01% CH3 OH b.0.01m CH3 OH c .xCH3 OH = 0.01 d. 0.99 M H2 O e. 0.01 N CH3 OH ANSWER : E Explanation : For methyl alcohol N= M (16)