Question

21. Which of the following cases can be used for storage of fresh sample of an oil for a long time?
(A)Carbon dioxide or oxygen
(C) Carbon dioxide or helium
(B) Nitrogen or oxygen
(D) Helium or nitrogen


22. Which of the following is (are) an endothermic process(es)?
(i) Dilution of Sulphuric acid
(ii) Sublimation of dryice
(iv) Condensation of water vapour
(v) Evaporation of water
(A) (l) and (ii)
(B) (i),(ii)and (iii)
(C) (h)only (D) (w) and(iv)

23. Common salt besides being used in kitchen can also be used as the raw material for making

(i) Washing soda (ii) Bleaching powder (iii) Baking soda (iv) Slaked lime

(A) (i) and (ii) (B) (i), (ii) and (iii) (C) (i) and (iii) (D). (i) ,(iii)and (iv)

24. The pH of the gastric juices released during digestion is
(A) Less than 7
(B) More than 7
(C) Equal to 7
(D) Equal to 0

25. Which of the following pairs will give displacement reactions?
(A) FeSO4 solution and Copper metal
(B) AgNO: solution and Copper metal
(C) CuSO4 Solution and Silver metal
(D) NaCl solution and Copper metal



Question No. 26 to 29 consist of two statements - Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
(A) Both A and Rare true and R is the correct explanation of A
(B) Both A and Rare true and Ris not the correct explanation of A
(C) A is true but R is false
(D) A is False but Ris true
26. Assertion: After whitewashing the walls, a shiny white colour on walls is obtained after 2 to 3 days.
Reason: Calcium hydroxide reacts with carbon dioxide to form calcium carbonate which gives shiny white colour to the walls.

27. Assertion: There is no mixing of oxygenated and deoxygenated blood in the human heart.

Reason: Valves are present in the heart which allows movement of blood in one direction only.

28. Assertion: Small intestine receives the secretion of the liver that digest fats.

Reason: Bile juice contains enzymes.

29. Assertion: The acid must always be added to water with constant stirring.

Reason: Mixing of an acid with water decreases the concentration of Hions per unit volume.

30. In case of kidney failure, an artificial kidney can be used for cleaning the blood of a person by separating urea from blood is called:
(A) Osmosis
(B) Filtration
(C) Circulation
(D) Dialysis

31. Complete digestion of food takes place in:
(A) Small intestine
(B) Large intestine
(C) stomach
(D) Food pipe

32. The enzyme that break down starch into simpler form is known as:
(A) Proteases
(B) Lipase
(C) Salivary amylase
(D) Trypsin


33. Which of the following is correct?

(A)Lactic acid-vinegar, Acetic acid-lemon, Citric acid-tomato, Oxalic acid curd
(B)Lactic acid-lemon, Acetic acid-tomato, Citric acid curd, Oxalic acid vinegar
(C)Lactic acid-curd, Acetic acid-lemon, Citric acid tomato, Oxalic acid vinegar
(D)lactic acid-curd, Acetic acid vinegar, Citric acid lemon, Oxalic acid tomato


34. Transpiration and root pressure cause water to rise in plants by
(A)Pushing it upward
(B)Pushing and pulling it respectively
(C)Pulling and pushing it respectively
(D)Pulling it upward

35. Transportation of organic food in plants is called
(A) Translocation
(B) Transpiration
(C) Photosynthesis
(D) Transduction


36. Which of the following salts does not contain water of crystallization?
(A) Blue vitriol
(C) Washing soda
(D) Gypsum
(B) Baking soda​

Answer 1

Answer:

36 ans- Answer : Baking soda does not contain water of crystallization. The chemical formula of baking soda is NaHCO3. Its formula does not show any association with water molecules.

Answer 2

24. a) pH less than 7

30. d) dialysis

31. a)small intestine

32. c) salivary amylase

33. d) is the required answer

34. a) pushing upwards

35. a) translocation