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Practice Questions & Answers :: Cocubes

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Total Practice Qs: 137+

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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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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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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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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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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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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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 Light travels along the optical fibers by which mechanism?


ARefraction

BReflection

CScattering

DTotal internal reflection

Answer: Option D

Explanation:


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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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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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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