Do You Know | Science | Physics

Physics regards the physical aspects of the natural world. It includes topics that deal with forces on different bodies within the universe and phenomena that explain how the universe works. The word 'Physics' comes from the Greek word 'phusis' meaning 'nature', introduced by the ancient scientist 'Aristotle'. Man has always been fascinated by nature.

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Q.  What will be the load experienced for a man with a load jumps from a high building?
A.  Zero, because while falling, both the man and the load are falling at the same acceleration i.e. acceleration due to gravity.
Q.  Why does a ball bounce upon falling?
A.  When a ball falls, it is temporarily deformed. Because of elasticity, the ball tends to regain its original shape for which it presses the ground and bounces up (Newton's Third Law of Motion).
Q.  Why is standing in boats or double decker buses not allowed, particularly in the upper deck of buses?
A.  On tilting the centre of gravity of the boat or bus is lowered and it is likely to overturn.
Q.  Which is more elastic, rubber or steel?
A.  Steel is more elastic for the same stress produced compared with rubber.
Q.  Which one would fall faster among a feather, a wooden ball and a steel ball fall simultaneously in a vacuum?
A.  All will fall at the same speed in vacuum because there will be no air resistance and the earth?s gravity will exert a similar gravitational pull on all.
Q.  When a man fires a gun, he is pushed back slightly. Why?
A.  As the bullet leaves the nozzle of the gun?s barrel with momentum in a forward direction, as per Newton's Third Law of Motion, the ejection imparts to the gun as equal momentum in a backward direction.
Q.  A man with a load jumps from a high building. What will be the load experienced by him?
A.  Zero, because while falling, both the man and the load are falling at the same acceleration i.e. acceleration due to gravity.
Q.  If a feather, a wooden ball and a steel ball fall simultaneously in a vacuum, which one of these would fall faster?
A.  All will fall at the same speed in vacuum because there will be no air resistance and the earth?s gravity will exert a similar gravitational pull on all.
Q.  Why does a man fall forward when he jumps out of a running train or bus?
A.  He is in motion while in the train or bus. When he jumps out, his feet comes to rest while touching the ground but his upper portion which is still in motion propels him forward.
Q.  Why is a compass used as an indicator of direction?
A.  The magnetic needles of a compass under the influence f the earth?s magnetic field lie in a north-south direction. Hence, we can identify direction.
Q.  Curved rail tracks or curved roads are banked or raised on one side. Why?
A.  Because a fast moving train or vehicle leans inwards while taking turn and the banked or raised track provides required centripetal force to enable it to move round the curve.
Q.  What is Physics?
A.  The word 'Physics' comes from the Greek word 'phusis' meaning 'nature', introduced by the ancient scientist 'Aristotle'. Man has always been fascinated by nature. So, he questioned and sought answers for every phenomena nature could offer. The branch of science which is devoted to the study of nature and natural phenomena is called Physics. It is expected that all the events in nature take place according to some basic laws. Physics reveals these basic laws from day-to-day observations.
Q.  Name the scientist who proposed Doppler Effect?
A.  Christian Doppler
Q.  Who discovered the laws of planetary motion?
A.  Johannes Kepler
Q.  Who first proposed the concept of Atomic number?
A.  Henry Moseley
Q.  Sound waves can travel in vacuum. True or false
A.  FALSE
Q.  In a vacuum flask, silvering reduces the loss of heat by
A.  radiation
Q.  The period of oscillation of a pendulum depends on
A.  length of the spring
Q.  Theory of relativity was explained by
A.  Albert Einstein
Q.  Name the scientist who proposed Doppler Effect
A.  Christian Doppler
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