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A lens forms the image of an object placed at a distance of 45 cm from it on a screen placed at a distance 90 cm on the other side of it. Name the kind of lens.
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How will you differentiate between a convex and a concave lens by looking at a distant object.
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How will you differentiate between a convex and a concave lens by looking at a printed page?
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The wavelengths of violet and red light are 4000 Å and 8000 Å respectively. Which of the two has the higher frequency?
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The wavelength range of white light is ______.
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A wave has wavelength 50Å of name the wave.
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A wave has wavelength 50Å of State the speed in vacuum.
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A wave has wavelength 50Å of State its one use.
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What do you mean by reflection of sound? State one condition for the reflection of a sound wave. Name a device in which reflection of sound wave is used.
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State whether the potential is a scalar or vector?
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Calculate the current flowing through each of the resistors A and B in the circuit shown in the following figure.
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Write an expression for the electrical power spent in flow of current through a conductor in terms of resistance and potential difference.
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Write an expression for the electrical power spent in flow of current through a conductor in terms of current and resistance.
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State the principle of an ideal machine.
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Point out two differences between e.m.f. and potential difference as applied to electric circuits.
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Explain why potential difference is always less than the e.m.f. of a cell?
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What do you understand by the resistance of a wire?
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Draw a graph of Potential difference (V) versus Current (I) for an ohmic resistor. How can you find the resistance of the resistor from this graph?
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Three resistors are connected to a 12 V battery as shown in the figure given below:
(i) What is the current through the 8 ohm resistor?
(ii) What is the potential difference across the parallel combination of 6 ohm and 12 ohm resistor?
(iii) What is the current through the 6 ohm resistor?
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