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A radioactive source emits three types of radiations.
Name the radiation which travels with the speed of light.
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A radioactive source emits three types of radiations.
Which radiation has zero mass?
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A radioactive source emits three types of radiations.
Name the radiation which has the lowest ionizing power.
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How γ - radiations are produced?
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State the factors on which the e.m.f of a cell depends.
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A cell of e.m.f. E and internal resistance r is used to send current I in an external resistance R. Write expressions for (i) the current drawn from the cell,
(ii) the terminal voltage V of the cell, and
(iii) the voltage drop across the internal resistance. How are E and V related?
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Show the path of a ray of light when it travels from air into water, the angle of incidence being 30°. Mark the angle of incidence and the corresponding angle of refraction.
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A cell of e.m.f. 1.5 V and internal resistance 1.0 W is connected to two resistors of 4.0 W and 20.0 in series as shown in the figure: Calculate the:
(i) Current in the circuit.
(ii) Potential difference across the 4.0 ohm resistor.
(iii) Voltage drop when the current is flowing.
(iv) Potential difference across the cell.
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How are the refractive index of water-related to the real depth and the apparent depth of a column of water?
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With the help of a well-labelled diagram show that the apparent depth of an object, such as a coin, in water is less than its real depth.
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Why is the heating coil placed in a circular porcelain plate in an electric stove?
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State two advantages of ‘the ring system of house wiring’.
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State the colour coding of wires in the flexible lead used for connecting the appliances to the mains in a house circuiting.
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Why is that the same current flowing through the bulb heats up the filament, while the leads are not heated up?
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A lady working in her kitchen received a shock from an electric hot plate. What could be the reason for the shock?
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Why is the filament in an electric bulb coiled?
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Why mica is preferred to other insulators in an electric iron?
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What will happen if switch is connected in ‘neutral wire’?
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Where is a fuse placed in an electrical circuit? Name a material suitable for making a fuse wire.
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