11TH
MAHARASHTRA
BOARD
COMPUTER
SCIENCE PAPER 2
MCQ
WITH ANSWER
Q. At room temperature the current in an intrinsic
a semiconductor is due to
A. holes
B. electrons
C. ions
D. holes and electrons
Answer: D
Q. Work function is the maximum energy required by the
fastest electron at 0 K to escape from the metal surface.
A. True
B. False
Answer: B
Q. The most commonly used semiconductor material is
A. silicon
B. germanium
C. mixture of silicon and germanium
D. none of the above
Answer: A
Q. In which of these is reverse recovery time nearly zero?
A. Zener diode
B. Tunnel diode
C. Schottky diode
D. PIN diode
Answer: C
Q. A transistor has a current gain of 0.99 in the CB mode. Its
current gain in the CC mode is
A. 100
B. 99
C. 1.01
D. 0.99
Answer: A
Q. The amount of photoelectric emission current depends
on
A. frequency of incident radiation
B. intensity of incident radiation
C. both frequency and intensity of incident radiation
D. none of the above
Answer: B
Q. Assertion (A): A p-n junction has high resistance in
reverse direction.
Reason (R): When a reverse bias is applied to p-n junction, the width
of depletion layer increases
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true
Answer: A
Q. Voltage series feedback (Also called series-shunt
feedback) results in
A. increase in both I/P and O/P impedances
B. decrease in both I/P and O/P impedances
C. increase in I/P impedance and decrease in O/P impedance
D. decrease in I/P impedance and increase in O/P impedance
Answer: C
Q. How many free electrons does a p type semiconductor
has?
A. only those produced by thermal energy
B. only those produced by doping
C. those produced by doping as well as thermal energy
D. any of the above
Answer: A
Q. . Which of the following has highest resistivity?
A. Mica
B. Paraffin wax
C. Air
D. Mineral oil
Answer: C
Q. ____ number of terminals does a diode have
A. 1
B. 2
C. 3
D. 4
Answer: Option B
Explanation:
2
A diode is a two – terminal electronic component with asymmetric conductance & it has low resistance to current in one direction & high resistance in the other
Q. A source program is the program written in ____ language.
(A) English
(B) Symbolic
(C) High level
(D) Machine
Ans: C
High level
Q. The new ___ integrates the function of a processor, memory and video on a single chip.
(A) Chip processor
(B) System on a chip
(C) Power processor
(D) Micro processor
Ans: D
Micro processor
Q. The box that contains the central electronic components of the computer is the
(A) Input device
(B) Peripheral
(C) System unit
(D) Motherboard
Ans: C
System unit
Q. The CPU comprises of Control unit, Memory and ____ unit.
(A) Output
(B) Input
(C) Microprocessor
(D) Arithmetic/Logic
Ans: D
Arithmetic/Logic
Q. A microprocessor used in
(A) Personal computer
(B) ENIAC
(C) Mini computer
(D) Mainframe computer
Ans: A
Personal computer
Q. An inverter gates can be developed using
Two diodes
Resistance and capacitance
Transistor
Inductance and capacitance
Answer: (c) Transistor
Q. The output of the two-input OR gate is high
Only if both inputs are high
Only if both inputs are low
Only if one input is high and the other is low
If at least one of the inputs is high
Answer: (d) If at least one of the inputs is high
Q. The output of a two-input AND gate is high
Only if both the inputs are high
Only if both the inputs are low
Only if one input is high and the other is low
If at least one input is low
Answer: (a) Only if both the inputs are high
Q. NAND gate means
Inversion followed by AND gates
AND gates followed by an inverter
AND gate followed by OR gate
None of these
Answer: (b) AND gates followed by an inverter
Q. The output of the two-input NAND gate is high
Only if both the inputs are high
Only if both the inputs are low
Only if one input is high and the other is low
If at least one input is low
Answer: (d) If at least one input is low
Q. A NOR gate means
Inversion followed by an OR gate
OR gate followed by an inverter
NOT gate followed by an OR gate
NAND gate followed by an OR gate
Answer: (b) OR gate followed by an inverter
Q. The output of two-input NOR gate is high
Only if both the inputs are high
Only if both the inputs are low
Only if one input is high and the other is low
If at least one input is high
Answer: (b) Only if both the inputs are low
Q. An exclusive NOR gate is logically equal to
Inverter followed by an XOR gate
NOT gate followed by an exclusive XOR gate
Exclusive OR gate followed by an inverter
The complement of a NOR gate
Answer: (c) Exclusive OR gate followed by an inverter
Q. The gate ideally suited for bit comparison is a
Two input exclusive NOR gate
Two input exclusive OR gate
Two input NAND gate
Two input NOR gate
Answer: (a) Two input exclusive NOR gate
Q. Two input exclusive NOR gate gives high output
When one input is high and the other is low
Only when both the inputs are low
When both the inputs are the same
Only when both the inputs are high
Answer: (c) When both the inputs are the same
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