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⁞ Physics

General Science ➤ Physics ➤ 2
Question 11
Q11.  The direction of heat flow between two body depends on which of the following?
 

Answer :  Their temperatures


The direction of heat transfer is from a region of high temperature to another region of lower temperature, and is governed by the Second Law of Thermodynamics. Heat transfer changes the internal energy of the systems from which and to which the energy is transferred. The objects will exchange thermal energy, until thermal equilibrium is reached, i. e. until their temperatures are equal.
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Question 12
Q12.  Wind turbines convert which energy into mechanical power?
 

Answer :  kinetic


Kinetic turbines, used in hydropower plants and wind energy plants, convert kinetic energy into mechanical power. Then a generator converts the mechanical energy from the turbine into electrical energy.
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Question 13
Q13.  A pond of water appears less deep due to which of these reasons?
 

Answer :  refraction


The apparent depth looks less than its real depth due to the refraction of light. In a pond light reflected from bottom surface as moves out, it moves away from the normal water being denser. The refraction of light gives an impression of apparent depth as real depth of pond.
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Question 14
Q14.  When we see an object, the image formed on the retina is____:
 

Answer :  Real and inverted


The retina is the thin light-sensitive membrane lining the inner eyeball-towards the back of the eye. As our eye lens are convex in nature, they form mostly real, diminished i. e. reduced size and inverted images on the retina. When the images formed are real and inverted, the message sent by the optic nerve are chemical impulses which turn them into erect images that we see.
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Question 15
Q15.  Which of the following waves cannot be polarised?
 

Answer :  Ultrasonic


Only transverse waves (such as radio, ultraviolet and infrared waves) can be polarized since their vibrations can potentially occur in all directions perpendicular to the direction of travel. It is therefore possible to confine the vibrations to a single plane. However, sound waves are longitudinal in which vibrations are parallel to the direction of travel of the wave. The vibrations of a longitudinal wave occur along a single line, it is therefore not possible to confine that to a plane. So it cannot be polarized.
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