Page 694 - SUBSEC October 2017_Neat

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Item 27 refers to the following diagram. 29. If A = 1 and B = 0, what are the values of
the outputs X and Y?
V i +
V 0 (A) X = 0, Y = 0
- (B) X = 1, Y = 1
(C) X = 1, Y = 0
(D) X = 0, Y = 1

27. Which of the following statements does 30. Which of the following statements about
NOT apply to the op-amp in the diagram R-S flip-flops are correct?
above?
The op-amp circuit I. It contains 2 cross-linked NAND
or NOR gates
(A) is called a voltage follower II. The output is unpredictable for
(B) is used as an inverter one combination of inputs.
(C) is used as a buffer III. It has 2 input and one stable
(D) has a gain of one output state

(A) I and II only
Item 28 refers to the following diagram. (B) I and III only
(C) II and III only
A (D) I, II and III
C
B
31. Which of the following phenomena BOTH
demonstrate the wave nature of matter?
28. Which of the following gates is equivalent
to the combination above? (A) Reflection and Refraction
(B) Interference and Diffraction
(A) OR (C) Line spectra and Interference
(B) EXOR (D) Polarisation and Photoelectric
(C) AND effect
(D) NAND

32. In which of the following radiations do the

Item 29 refers to the following diagram photons have the LEAST energy?
of a half-adder.
(A) x-rays
(B) ultra violet
A
B X (C) γ -rays
(D) infrared

Y

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02238010/SPEC 2017