πŸ“Š Science
Q. Which of the following has the least penetrating power?
  • (A) Alpha particles
  • (B) Beta particles
  • (C) Gamma particles
  • (D) All have the same penetrating power
πŸ’¬ Discuss
βœ… Correct Answer: (A) Alpha particles

Explanation: Gamma rays are the most penetrating of all the radiations. As penetrating depends on the size of particles, bigger the size lesser the penetration power and α particles are bigger in size followed by β and then γ. Also, γ rays are highly energetic waves having higher frequency.

πŸ“Š Science
Q. Optic fibre are mainly used for which of the following?
  • (A) Communication
  • (B) Weaving
  • (C) Musical instruments
  • (D) Food Industry
πŸ’¬ Discuss
βœ… Correct Answer: (A) Communication
πŸ“Š Science
Q. Which of the following are most penetrating rays?
  • (A) Alpha rays
  • (B) Beta rays
  • (C) Gamma rays
  • (D) X rays
πŸ’¬ Discuss
βœ… Correct Answer: (C) Gamma rays
πŸ“Š Science
Q. Old written material which cannot be read easily can be read by
  • (A) Cosmic rays
  • (B) Ultraviolet rays
  • (C) Infrared rays
  • (D) none of these
πŸ’¬ Discuss
βœ… Correct Answer: (C) Infrared rays
πŸ“Š Science
Q. Cryogenic engines find application in
  • (A) Rocket technology
  • (B) Frost-free refrigerators
  • (C) Sub-marine propulsion
  • (D) Researches in supercon-ductivity
πŸ’¬ Discuss
βœ… Correct Answer: (A) Rocket technology
πŸ“Š Science
Q. The best colour(s) for a sun umbrella will be
  • (A) Black
  • (B) Black on top and white on the inside
  • (C) White on top and black on the side
  • (D) Printed with all the seven colours of rainbow
πŸ’¬ Discuss
βœ… Correct Answer: (C) White on top and black on the side
πŸ“Š Science
Q. Which of the following laws is explained by the statement that matter can neither be created or destroyed ?
  • (A) Law for conservation of energy
  • (B) Le Chatelier's principle
  • (C) Law of conservation of mass
  • (D) Law of osmosis
πŸ’¬ Discuss
βœ… Correct Answer: (C) Law of conservation of mass
πŸ“Š Science
Q. Aviation fuel for jet aeroplanes consists of purified
  • (A) Petrol
  • (B) Kerosene
  • (C) Gasoline
  • (D) Diesel
πŸ’¬ Discuss
βœ… Correct Answer: (B) Kerosene
πŸ“Š Science
Q. Which of the following is the correct combination of inventors and the inventions
  • (A) Galileo Galilei - Transistors
  • (B) Elisha Thomson - Windmill
  • (C) JL Baird - Television
  • (D) Sir Frank Whittle - Laser
πŸ’¬ Discuss
βœ… Correct Answer: (C) JL Baird - Television
πŸ“Š Science
Q. Who among ghr following laid the foundation of nuclear science in india
  • (A) Vikram Sarabhai
  • (B) Homi J Bhabha
  • (C) MGK Menon
  • (D) Raja Ramanna
πŸ’¬ Discuss
βœ… Correct Answer: (B) Homi J Bhabha

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