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Explain Why are stringed musical instruments provided with large sound boxes?
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What do you understand by free (or natural) vibrations?
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What do you understand by forced vibrations?
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What are the factors that affect the frequency of a vibrating string and how do they affect the frequency?
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What do you understand by free vibrations of a body? Draw a displacement-time graph to represent them. Given one example.
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Explain free and forced vibrations. Give an experimental arrangement to illustrate the phenomenon of resonance.
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Describe a simple experiment to illustrate the phenomenon of resonance and explain it.
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A mixture of radioactive substance gives off three types of radiation name the radiations which are charged.
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A mixture of radioactive substance gives off three types of radiation name the radiation similar in nature to cathode rays.
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A mixture of radioactive substance gives off three types of radiation name the radiation which is deviated most in a magnetic field.
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Answer the question with respect to the following diagram:
Name the charged particles emitted from the heated filament? Name the phenomenon of emission of these particles.
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Answer the question with respect to the following diagram:
A beam of such particles, after acceleration is allowed to strike a metal plate C. Radiation B is given off. Name the radiation B.
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Answer the question with respect to the following diagram:
Name the material of target C.
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Answer the question with respect to the following diagram:
State two properties of radiation B different from those of visible light.
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Answer the question with respect to the following diagram:
State two factors on which the wavelength of radiation B depends.
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Answer the question with respect to the following diagram:
State two uses of radiation B.
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Answer the question with respect to the following diagram:
Why is it necessary to cool the tube?
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When the speed of a moving object is doubled, then its kenetic energy ______.
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Is it possible for a concave lens to form an image of size two times that of the object? Write Yes or No.
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A car of mass 120 kg is moving at a speed 18 km/h and it accelerates to attain a speed of 54 km/h in 5 seconds. Calculate:
- the work done by the engine.
- the power of the engine.
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