Science And technology

  Written by Lovepreet Singh Grewal 👉 Click to follow on 👉 Instagram   (Princelovepreetsinhgrewal) 👉Click to follow on  twitter  ( Lovepretgrewal) 👉 Click to follow on    Linkedin  (Princelovepreetsinghgrewal) Introduction:   Microbiology is the branch of science that deals with the study of microorganisms which are invisible to the naked eye. Microbiologists are the persons specialized in the field of Microbiology. It is con­cerned with the form, structure, metabolism, growth, reproduction and identifica­tion of microorganisms.  It also includes the study of their distribution in nature, their relationship to each other and to other living organisms. Branches: Study of microbiology is further divided into many branches as following, Bacteriology : Study of Bacterias. Mycology : Study of Fungi. Virology : Study of Viruses.   Phycology : Study of Algae. Protozoology : Study of Protozoa. Microbial ecology : Study of interrelationshi...

  1. The chemical formula of baking powder is————- (a) NaHCO 3 (b) Na 2 CO 3 (c) Na 2 SO 4 (d) NaCl Ans: (a) Solution: The chemical formula of baking powder is NaHCO 3 2. Which has the maximum electropositive character? (a) Cu (b) Cs (c) Ba (d) Cr Ans: (b) Solution: Cs being an alkali metal is maximum electropositive in nature. 3. When the washing soda is heated (a) CO is released (b) CO + CO 2  is released (c) CO 2  is released (d) water vapours are released Ans: (d) Solution: upon heating, washing soda loses water molecules and becomes anhydrous sodium carbonate which does not decompose upon further heating. 4. Which sulfate has the highest solubility in water? (a) BaSO 4 (b) CaSO 4 (c) BeSO 4 (d) MgSO 4 Ans: (c) Solution: BeSO 4  has the highest solubility due to maximum hydration energy. 5. Which of the following metal ions plays an important role in muscle contraction? (a) K + (b) Na + (c) Mg 2+ (d) Ca 2+ Ans: (d) Solution: Ca 2+  ions are involved in muscl...

    © Written By  Lovepreet Singh Grewal  Click to follow on 👉 Instagram Click to follow on 👉 Twitter Click to more about    👉  Google Q1. Which Acid is present in Tomato? (A) Citric Acid (B) Oxalic Acid (C) Lactic Acid (D) HCl Correct Answer: Option (B) Q2. Which of the following is a strong acid? (A) HCl pH 1 (B) CH 3 COOH pH 5 (C) Lemon juice pH 2.2 (D) Pure Milk pH 6 Correct Answer: Option (A) Q3.   Na 2 CO 3 .10H 2 O is known as – (A) Baking soda (B) Baking powder (C) Washing soda (D) Bleaching powder Correct Answer: Option (C) Q4.   pH value less than 7 indicates that the solution is – (A) Acidic (B) Basic (C) Neutral (D) No effect Correct Answer: Option (A) Q5.   Which of the following is neutral salt? (A) NH 4 Cl (B) CH 3 COONH 4 (C) CH 3 COONa (D)Na 2 CO 3 Correct Answer: Option (B) Q6.   Lactic Acid is present in – (A) Orange (B) Tea (C) Curd (D) Vinegar Correct Answer: Option (C) Q7.   Farmers neutralise the effec...