light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions
light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST [16 - EXERCISES]
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Question : 16
The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason ?
a) The density of water is maximum at 4°C.
b) Since the surface of the lake is at the same temperature as the air, no heat is lost.
c) Ice is a bad conductor of heat.
d) None
Answer »Answer: (c)
When the temperature starts reducing in winter, lake water cools up to 4 degrees centigrade by convection as density increases with a reduction in temp.
On further cooling, due to anomalous expansion of water, density reduces & cold water remains at the top.
Then top layer freezes. Ice being a bad conductor of heat, lake water below ice remains at 4 degrees.
Question : 17 [UP UDA/LDA (Pre) 2002]
Two astronauts cannot hear each other on the Moon’s surface, because
a) No atmosphere on the Moon
b) They wear special space suits on the Moon
c) Their ears have stopped working on the Moon
d) The sound travels much more slowly on Moon
Answer »Answer: (a)
Question : 19 [UPPCS (Pre) 2003]
Consider the following statements.
- Fibre optics is based on the principle of total internal reflection.
- In an optical fibre communication system, power consumption is extremely low.
- Optical fibre communications are free from radio frequency interference.
- In India, Reliance Group of Industries is engaged in the manufacture of the optical fibre.
a) 1, 3 and 4
b) 1, 2 and 4
c) 1, 2 and 3
d) 2, 3 and 4
Answer »Answer: (c)
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» Measurement And SI Units
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» Mechanics (Mass, Force, Acceleration, Work, Energy, Momentum, Velocity)
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» Motion Under Gravity
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» Physical Properties Of Materials
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» Light, Heat, Thermodynamics, Wave Motion, Sound, Optics & Oscillations
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» Modern And Space Physics, Sources Of Energy
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» Classification Of Elements, Chemical Bonding, Periodicity In Properties & Physical Transformation
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» Fuel, Food Preservation, Nutrition, Medicine, Detergents And Fertilizers
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