Which logic gate is represented by the following, combination of logic gates in figure?

• OR

• NAND

• AND

• NOR

Which of the given statements about transistor is not true?

• Emitter is heavily doped.

• Base is thin.

• Base is lightly doped.

• Collector region is smaller comparative to emitter in size.

Assertion: The resistance of a junction of a spoiled transistor is low when forward biased or reverse biased. 

Reason: The resistance of a junction of a transistor in working order is high always.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.n

In an intrinsic semiconductor band gap is 1.2 eV then ratio of number of charge carriers at 600 K and 300 K is

• 10⁴

• 10⁷

• 10⁵

• 10³

The circuit as shown in figure,

the equivalent gate is

• NOR gate

• OR gate

• AND gate

• NAND gate

Assertion:  Electric appliances with metallic body. e.g., heaters, presses etc., have three pin connections, whereas an electric bulb has a two pin connection. 

Reason: Three pin connections reduce heating of connecting cables.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Which of the following current must be zero in an unbiased PN junction diode?

• Current due to majority charge carriers (both electrons and holes).

• Current due to minority charge carriers (both electrons and holes).

• Current due to majority and minority charge carriers

• Current due to majority and minority charge carriers (only holes).

For a common-emitter transistor, input current is 5A, ( β = 100 circuit is operated at load resistance of 10 kΩ, then voltage across collector emitter will be

• 5 V

• 10 V

• 12.5 V

• 7.5 V

Direction of electric field in P-N junction diode is

• from P-side to N-side

• From N-side to P-side

• randomly oriented

• electric field does not exist

Assertion: Photodiode and photovoltaic cell are based on the same principle.

Reason: Both use same method of operations to work.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.