F5 electronic

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Which of the following is NOT a property of a cathode rays?

• They travel in straight lines

• They are deflected by an electric field

• They are not affected by gravity

• They have momentum and energy

Figure shows a trace displayed on the screen of a C.R.O. The Y-gain is set to 5 V cm^-1 What is the peak voltage?

• 0 V

• 5 V

• 20 V

• 25 V

Figure shows a bulb and a diode connected to a battery in series. When switch, S is closed, the bulb does not light up. The bulb can be lighted up by

• replacing the wire connecting to the bub

• increasing the number of dry cells

• reversing the connection of the battery

• connecting a resistor parellel to the bulbb

Figure shows a bridge rectifier connected to a sinusoidal alternating voltage supply. A load resistor is connected across the output terminals P and Q. Which of the following traces would be displayed on the screen if a C.R.O. is connected across PQ?

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An n-type semiconductor is produced when some 0f the germanium atoms are replaced with

• divalent atoms

• trivalent atoms

• tetravalent atoms

• pentavalent atoms

A capacitor is used to smooth out the output voltage of a half-wave rectifier. In which of the following circuits is the capacitor correctly connected?

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Figure shows an npn transistor connected in a circuit. Which of the following is true?

• $I_c>I_B>I_E$

• $I_E>I_C>I_B$

• $I_B>I_C>I_E$

• $I_C>I_E>I_B$

The diagram shows a circuit containing bulbs X, Y and Z. Which bulb in the circuit will light up when the switch is on

• A Z only

• B X and Y only

• C Y and Z only

• D X, Y and Z

How many electrons are there in the outer most shell of Silicon

• 5

• 4

• 3

• 8