Science And technology

  © Written By  Lovepreet Singh Grewal  Click to follow on 👉 Instagram Click to follow on 👉 Twitter Click to more about Lovepreet Singh Grewal     👉  Google Any  Inquiry Whatsapp: 7508787868  Amino Acids, DNA and RNA This set of Organic Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Amino Acids, DNA and RNA”. 1. In double helix of DNA, the two DNA strands show which type of characteristics? a) coiled around a common axis b) coiled around each other c) coiled differently d) coiled over protein sheath Answer: a Explanation: The DNA molecule consists of two long, parallel chains which are joined together by short crossbars at regular intervals. The two chains are spirally coiled around a common axis in a regular manner to form a right handed double helix. 2. A nucleotide is formed of which of the following units? a) nitrogen base and phosphate b) nitrogen base, sugar and phosphate c) nitrogen base and sugar d) sugar and phosphate Answer: b Explanation: Nucleotide

 © Written By  Lovepreet Singh Grewal  Click to follow on 👉 Instagram Click to follow on 👉 Twitter Click to more about    👉  Google Any  Inquiry Whatsapp: 7508787868 Frequently asked Physics Questions and Answers for Competitive Exams Q.1 Which of the following measurements is not a unit of distance?   (A) Ammeter (B) Cubit (C) Parsec (D) angstrom Ans. A Q.2 Which one of the following remains constant while throwing a ball upward?   (A) Displacement (B) Kinetic energy (C)  Acceleration (D)   Velocity Ans. C Q.3 Pure water freezes at what temperature?   (A) 47 F (B) 32 F (C)  0 F (D)   19 F Ans. B Q.4 Which vitamin is abundant in citrus fruits?   (A) Vitamin A (B) Vitamin B (C)  Vitamin C (D)   Vitamin D Ans. C Q.5 Zinc Oxide is   (A) Acidic (B) Basic (C)  Neutral (D)   Amphoteric Ans. D Q.6 Pure water is a _____________ Conductor of electricity.   (A) super conductor (B) bad conductor (C)  speed conductor (D)   None of these Ans.

© Written By  Lovepreet Singh Grewal  Click to follow on 👉 Instagram Click to follow on 👉 Twitter Click to more about    👉  Google Any  Inquiry Whatsapp: 7508787868   1. Mirage is due to _________ A.      Equal heating of different parts of the atmosphere B.       Magnetic disturbances in the atmosphere C.       Depletion of ozone layer in the atmosphere D.      Unequal heating of different parts of the atmosphere Answer: D 2. Light year is a unit of ___________ A.      Time B.       Light C.       Intensity of light D.      distance Answer: D 3. The light from the sun reaches us in nearly__________ A.      8 minutes B.       4 minutes C.       2 minutes D.      16 minutes Answer: A 4. ___________is not used in the field of physics. A.      Stock value B.       Latent heat C.       Nuclear fusion D.      Refractive index Answer: A 5. The working principle of a washing machine is ____________ A.      diffusion B.       centrifuga