📊 Physics
Q. The motion of a body that repeats itself after a regular interval of time is
  • (A) A periodic motion
  • (B) A simple harmonic motion
  • (C) An aperiodic motion
  • (D) An oscillatory motion
💬 Discuss
✅ Correct Answer: (A) A periodic motion
📊 Physics
Q. Negative acceleration is in the opposite direction of:
  • (A) Force
  • (B) Distance
  • (C) Velocity
  • (D) Momentum
💬 Discuss
✅ Correct Answer: (C) Velocity
📊 Physics
Q. If an object moves with constant velocity,
  • (A) It must have constant speed
  • (B) It must have constant direction
  • (C) It must have constant speed in constant direction
  • (D) None of the above
💬 Discuss
✅ Correct Answer: (C) It must have constant speed in constant direction
📊 Chemistry
Q. Bleaching powder is used in drinking water as a/an
  • (A) Disinfectant
  • (B) Antibiotic
  • (C) Antiseptic
  • (D) Coagulant
💬 Discuss
✅ Correct Answer: (A) Disinfectant
📊 Chemistry
Q. The process of removing calcium and magnesium from hard water is known as
  • (A) Sedimentation
  • (B) Filtration
  • (C) Flocculation
  • (D) Water softening
💬 Discuss
✅ Correct Answer: (D) Water softening
📊 Chemistry
Q. Hard water and soft water can be distinguished by using
  • (A) Dilute acid
  • (B) Ordinary soap
  • (C) Detergent
  • (D) Liquid soap
💬 Discuss
✅ Correct Answer: (C) Detergent
📊 Chemistry
Q. Which method will be employed to test the hardness of water?
  • (A) Boiling
  • (B) Distillation
  • (C) Formation of lather with soap
  • (D) None of these
💬 Discuss
✅ Correct Answer: (C) Formation of lather with soap
📊 Chemistry
Q. The purest form of water is
  • (A) Tap water
  • (B) Rain water
  • (C) Ground water
  • (D) Distilled water
💬 Discuss
✅ Correct Answer: (B) Rain water
📊 Chemistry
Q. Water cycle refers to
  • (A) An integrated attempt to recycle water in relatively arid regions
  • (B) Constant movement of water from ocean to land and back to ocean once again
  • (C) Scientific management of water in areas excessively plagued with water-logging
  • (D) Water distribution in relatively dry areas
💬 Discuss
✅ Correct Answer: (B) Constant movement of water from ocean to land and back to ocean once again
📊 Chemistry
Q. Permanent hardness of water may be removed by addition of
  • (A) Alum
  • (B) Sodium carbonate
  • (C) Lime
  • (D) Potassium Permangante
💬 Discuss
✅ Correct Answer: (B) Sodium carbonate

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