Please select a subject first
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Answer briefly.
Explain what is meant by phase of a wave.
Concept: undefined >> undefined
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State any four properties of progressive wave.
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Solve the following problem.
A certain sound wave in air has a speed 340 m/s and wavelength 1.7 m for this wave, calculate
- the frequency
- the period
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Solve the following problem.
A tuning fork of frequency 170 Hz produces sound waves of wavelength 2 m. Calculate the speed of sound.
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Sound wave A has period 0.015 s, sound wave B has a period of 0.025 s. Which sound has greater frequency?
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Choose the correct option.
Let r be the distance of a point on the axis of a bar magnet from its center. The magnetic field at r is always proportional to
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Choose the correct option.
A magnetic needle kept nonparallel to the magnetic field in a nonuniform magnetic field experiences
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Answer the following question in brief.
What is the unit of Magnetic Intensity?
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Answer the following question in detail.
Draw a diagram to illustrate the magnetic lines of force between the south poles of two such magnets.
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Choose the correct option.
The energy levels of holes are:
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Answer the following question.
Which element would you use as an impurity to make germanium an n-type semiconductor?
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Answer the following question.
On which factors does the electrical conductivity of a pure semiconductor depend at a given temperature?
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Answer the following question.
Why is the conductivity of a n-type semiconductor greater than that of p-type semiconductors even when both of these have the same level of doping?
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Answer in one sentence.
Define strain.
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Answer in one sentence.
How should be a force applied on a body to produce shearing stress?
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Answer the following question.
How a thermometer is calibrated?
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Solve the following problem.
In a random temperature scale X, water boils at 200 °X and freezes at 20 °X. Find the boiling point of a liquid in this scale if it boils at 62 °C.
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Give reasons/short answer.
Prove that the current density of a metallic conductor is directly proportional to the drift speed of electrons.
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Solve the following problem.
A current 4A flows through an automobile headlight. How many electrons flow through the headlight in a time 2hrs?
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