11th Class Physics Notes

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• Name several repetitive phenomenon occurring in nature which could serve as reasonable time standards.
• Give the draw backs to use the period of a pendulum as a time standard.
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• Why do we find it useful to have two units for the amount of substance, the kilogram and the mole?
• Does a dimensional analysis give any information about constant of proportionality that may appear in an algebraic expression? Explain.
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• The vector sum of three vectors gives a zero resultant. What can be the orientation of the vectors? 
• If one of the components of a vector is not zero, can its magnitude be zero? Explain. 
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• Can the magnitude of a vector have a negative value? 
• Two vectors have unequal magnitudes. Can their sum be zero? Explain.
• Suppose the sides of a closed polygon represent vector arranged head to tail. What is the sum of these vectors?
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• An object is thrown vertically upward. Discuss the sign of acceleration due to gravity, relative to velocity, while the object is in air. 
• Define impulse and show that how it is related to linear momentum.
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• A person holds a bag of groceries while standing still, talking to a friend. A car is stationary with its engine running. From the standpoint of work, how are these two situations similar?
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• A body uses a catapult to throw a stone, which accidentally smashes a green house window. List the possible energy changes. 
• What is meant by angular momentum? Explain the law of conservation of angular momentum? 
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• Explain why an object, orbiting the Earth, is said to be freely falling. Use your explanation to point out why objects appear weightless under certain circumstances.
• Explain how much minimum number of geo-stationary satellites are required for global coverage of T.V. transmission. 
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• What is meant by drag force? What are the factors upon which drag force acting upon a small sphere of radius r, moving down through liquid, depend?
• A person is standing near a fast moving train. Is there any danger that he will fall towards it?
• Name two characteristics of simple harmonic motion.
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• Can we realize an ideal simple pendulum?
• Show that in SHM the acceleration is zero when the velocity is greatest and the velocity is zero when the acceleration is greatest.
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• Describe some common phenomena in which resonance plays an important role.
• What features do longitudinal waves have in common with transverse waves? 
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• How are beats useful in tuning musical instruments? 
• As a result of distant explosion, an observer senses a ground tremor and then hears the explosion. Explain the time difference.
• How should a sound source move with respect to an observer so that the frequency of its sound does not change?
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• Under what conditions two or more sources of light behave as coherent sources? 
• Could you obtain Newton’s rings with transmitted light? If yes, would the pattern be different from that obtained with reflected light?
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• Why the Polaroid sunglasses are better than ordinary sunglasses? 
• What o you understand by linear magnification and angular magnification? Explain how a convex lens is used as a magnifier?
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• If a person were looking through a telescope at the full moon, how would the appearance of the moon be changed by covering half of the objective lens.
• How the power is lost in optical fibre through dispersion? Explain. 
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