ELECTRONICS (F5)

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

Which of the following shows the correct path of an electron beam in a magnetic field?

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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 truth tables for two logic gates P and Q are shown in Table 4.2 and Table 4.3 respectively. When the output of P is connected to the input of Q, the resulting combination is equivalent to a single

• NOT gate

• OR gate

• NAND gate

• NOR gate

Table 4.4 gives a truth table of a combination of logic gates. Which of the following combination yields this truth table?

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