[MCQ 31] What is called the frequency below 20 Hz?
[A] audible sound
[B] infrasonic
[C] ultrasonic
[D] supersonic
[Answer]
[B] infrasonic
[MCQ 32] Sound can travel at maximum speed at?
[A] Steel
[B] water
[C] wind
[D] Vaccume
[Answer]
[A] Steel
[MCQ 33] Which of the following molecule is mono atomic?
[A] Oxygen
[B] Hydrogen
[C] Nitrogen
[D] Helium
[Answer]
[D] Helium
[MCQ 34] The atomicity of ozone molecule is
[A] 1
[B] 2
[C] 3
[D] 4
[Answer]
[C] 3
[MCQ 35] Which radioactive element is used in the therapy of cancer?
[A] Uranium
[B] Barium
[C] Cobalt
[D] Plutonium
[Answer]
[C] Cobalt
[MCQ 36] Which of the following ray come out during nuclear transition?
[A] X-Ray
[B] UV ray
[C] Light ray
[D] Gamma Ray
[Answer]
[D] Gamma Ray
[MCQ 37] Water become hot faster than milk. Because
[A] Water has more specific heat than milk
[B] Water has less specific heat than milk
[C] Milk has more density than water
[D] milk is an organic compound
[Answer]
[A] Water has more specific heat than milk
[MCQ 38] Archimedes’ principle is applied to
[A] liquid
[B] Gas
[C] both liquid and gas
[D] None of these
[Answer]
[C] both liquid and gas
[MCQ 39] Centrifugal force is known as
[A] pseudo force
[B] useless work
[C] both the above
[D] None of the above
[Answer]
[C] both the above
[MCQ 40] In which of the following case one feels weightless.
[A] While moving in space
[B] in a lift moving upward
[C] in a lift moving downward
[D] while landing on moon
[Answer]
[A] While moving in space