Practice Questions & Answers :: Cocubes

Cocubes
Tot. Mock Test: 73+
Tot. Exam. Sec.: 5+
Total Practice Qs: 137+
31 / 137
Using 4-bit numbers (n = 4) if k = (0011)2 how is k expressed in 2's complement.
A(1011)2
B(1101)2
C(1100)2
D(0101)2
Answer: Option B
Explanation:In 2's complement simply find 2's complement ? (0011)2 * 1100 + 1 * (1101)2 . (Technique: Make all 1's zero and all 0's one and then add 1. You will get 2's complement.
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32 / 137
Amplitude modulation is the process of
Asuperimposing a low frequency on a high frequency
Bsuperimposing a high frequency on a low frequency
Ccarrier interruption
Dfrequency shift and phase shift
Answer: Option A
Explanation:Modulating signal will have alower frequency as compared to the frequency of the carrier signal.
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33 / 137
An image uses 512 x 512 picture elements. Each of the picture elements can take any of the 8 distinguishable intensity levels. The maximum entropy in the above image will be
A2097152 bits
B648 bits
C786432 bits
D144 bits
Answer: Option C
Explanation:Each picture element can be represented by 3 bits. Thus total entropy = 512 x 512 x 3 = 786432.
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34 / 137
In a purely capacitive circuit, the current …..the voltage by …….
A( lags, 0o
B(leads, 90o
C(lags, 90o
D( lags, 45o
Answer: Option B
Explanation:Here is no explanation for this answer
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35 / 137
In case of ideal current sources, they have
Azero internal resistance
Blow value of voltage
Clarge value of currrent
Dinfinite internal resistance
Answer: Option D
Explanation:The internal resistance of an ideal current source is infinite. An independent current source with zero current is identical to an ideal open circuit. The voltage across an ideal current source is completely determined by the circuit it is connected to.
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36 / 137
A voltage source having an open circuit voltage of 200 V and internal resistance of 50? is equivalent to a current source of
A4A with 50? in parallel
B4A with 50? in series
C0.5A with 50? in parallel
Dnone of the mentioned
Answer: Option A
Explanation:V=200 v R= 50 so I= 4amp Now the same can be represented as 4A with 50 in parallel.
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37 / 137
Light travels along the optical fibers by which mechanism?
ARefraction
BReflection
CScattering
DTotal internal reflection
Answer: Option D
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38 / 137
The principle of locality of reference justifies the use of
Ainterrupts
BDMA
Cvirtual memory
Dcache memory
Answer: Option D
Explanation:Locality of reference, also known as the principle of locality, is a term for the phenomenon in which the same values, or related storage locations, are frequently accessed, depending on the memory access pattern, hence the answer is Cache memory which is accessed always the first whenever cpu wants any information for processing.
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39 / 137
A square in which each (i,
AHermitian matrix
BSkew symmetric matrix
CConjugate anti-symmetric matrix
DSkew-Hermitian matrix
Answer: Option D
Explanation:This matrix is called skew hermitian matrix. A square matrix, A , is skew-Hermitian if it is equal to the negation of its complex conjugate transpose, A = -A' .Below is an example of Skew Hermitian Matrix.
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40 / 137
The frequency at which the phase of the system acquires ____ is known as
A
B
C
D
Answer: Option D
Explanation:The phase crossover frequency is the frequency at which the phase angle first reaches ?180°.
This is the factor by which the gain must be multiplied at the phase crossover to have the value 1.
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Here is the list of questions asked in Cocubes paper Practice questions with Answers Page 4. Practice Cocubes Written Test Papers with Solutions and take Q4Interview Cocubes Online Test Questions to crack Cocubes written round test. Overall the level of the Cocubes Online Assessment Test is moderate. Only those candidates who clear the written exam will qualify for the next round, so practic all the questions here and take all the free tests before going for final selection process of Cocubes