14 | Electrical measurements-Digital Communications MCQs set | Learn & Give Online MCQS Test ,MCQs: multiple choice questions and answers,Mock Tests and Practice Papers

Question:

A cryptographic hash function has variable output length.

1.True

2.False

Question:

A set of numbers is called as super increasing if

1.Each element is greater than previous element

2.Each element greater than sum of all the previous elements

3.Each element greater than the average of all elements

4.Each element lesser than the sum of all the elements

Question:

CDMA rejects

1.Narrow band interference

2.Wide band interference

3.Narrow & Wide band interference

4. None of the mentioned

Question:

CDMA uses

1.Hard hand off

2.Soft hand off

3.Hard & Soft hand off

4.None of the mentioned

Question:

Cipher system can be solved effectively by statistically using

1.Time of occurrence

2.Frequency of occurrence

3.Length of the message

4.None of the mentioned

Question:

Data compression includes

1.Removal of redundant character

2.Uniform distribution of characters

3.Removal of redundant character & Uniform distribution of characters

4.None of the mentioned

Question:

Encryption transformations are known as

1.Diffusion

2.Confusion

3.Diffusion & Confusion

4.None of the mentioned

Question:

Eulerâ€™s totient function is determined by

1.pq

2.(p-1)(q-1)

3.(p+1)(q+1)

4.p/q

Question:

Examples of hash functions are

1.MD5

2.SHA-1

3.MD5 & SHA-1

4. None of the mentioned

Question:

For digital signatures private key cryptosystem is used.

1.True

2.False

Question:

For n input bits the number of substitution patterns are

1.2n

2.(2n)!

3.1/2n!

4. 2n!

Question:

Frequency planning is very essential in

1.FDMA

2.TDMA

3.FDMA & TDMA

4.None of the mentioned

Question:

In a trapdoor function, the functions are easy to go in

1.One direction

2.Two directions

3.All directions

4.None of the mentioned

Question:

In cipher feedback method, encryption is done on

1.Single individual bits

2. Characters

3.Single individual bits & Characters

4.None of the mentioned

Question:

In digital communication, interaction between ______ is possible.

1.Any layer to layer

2.One layer to next layer

3. layers

4.None of the mentioned

Question:

In public key cryptosystem which is kept as public?

1.Encryption keys

2.Decryption keys

3.Encryption & Decryption keys

4.None of the mentioned

Question:

In public key cryptosystem _____ keys are used for encryption and decryption.

1.Same

2.Different

3.Encryption Keys

4.None of the mentioned

Question:

In stream encryption, the key sequence repeats itself.

1.True

2.False

Question:

In this Merkle Hellman method same key is used for encryption and decryption.

1.True

2.False

Question:

In transposition, the plaintext letters are

1.Substituted

2.Rearranged

3.Removed

4.None of the mentioned

Question:

In which method, key-stream is generated independently?

1.Synchronous

2.Self synchronous

3.Synchronous & Self synchronous

4.None of the mentioned

Question:

Knapsack problem can be solved by

1.Public key cryptosystem

2.Private key cryptosystem

3. Public & Private key cryptosystem

4.None of the mentioned

Question:

Merkle hellman is a symmetric cryptosystem.

1.True

2.False

Question:

PGP offers _____ block ciphers for message encryption.

1.Triple-DES

2.CAST

3.IDEA

4.All of the mentioned

Question:

PGP system uses

1.Private key system

2.Public key system

3.Private & Public key system

4.None of the mentioned

Question:

Pretty good privacy (PGP) security system uses

1.Public key cryptosystem

2.Private key cryptosystem

3.Public & Private key cryptosystem

4.None of the mentioned

Question:

Pretty good privacy program is used for

1.Electronic mails

2.File encryption

3.Electronic mails & File encryption

4.None of the mentioned

Question:

Private key algorithm is used for _____ encryption and public key algorithm is used for _____ encryption.

1.Messages, session key

2.Session key, messages

3.Can be used for both

4.None of the mentioned

Question:

Processing gain is the ratio of message bandwidth to signal bandwidth.

1.True

2.False

Question:

Public key cryptosystem is also known as

1.One way function

2.Two way function

3.Feedback function

4.None of the mentioned

Question:

Public key cryptosystem is used for the encryption of

1.Messages

2. Session key

3. Session key & Messages

4.None of the mentioned

Question:

Public key cryptosystem uses same key for both encryption and decryption.

1.True

2.False

Question:

Some advantages of spread spectrum are

1.Low susceptibility

2.Immunity to jamming

3.Reduced interference

4.All of the mentioned

Question:

Synchronous ciphers uses

1.Confusion

2.Diffusion

3.Confusion & Diffusion

4.None of the mentioned

Question:

The key size of DES is

1.56 bits

2.64 bits

3. 128 bits

4.168 bits

Question:

The substitution of the letters are done

1.Serially

2.Parallel way

3.Serially & Parallel way

4. None of the mentioned

Question:

These three ciphers can operate of ______ of plaintext and cipher text.

1.128 bit blocks

2.64 bit blocks

3.256 bit blocks

4.156 bit blocks

Question:

What is the key size allowed in PGP?

1.1024-1056

2.1024-4056

3.1024-4096

4. 1024-2048

Question:

Which algorithm can be used to sign a message?

1.Public key algorithm

2.Private key algorithm

3.Public & Private key algorithm

4.None of the mentioned

Question:

Which algorithm is used for public key encryption?

1.RSA

2.Diffie-Hellman

3.RSA & Diffie-Hellman

4.None of the mentioned

Question:

Which are called the block ciphers?

1.IDEA

2.CAST

3.Triple-DES

4.All of the mentioned

Question:

Which block cipher has key length of 128 bits?

1.IDEA

2.CAST

3.IDEA & CAST

4.None of the mentioned

Question:

Which has a key length of 128 bits?

1.IDEA

2.Triple-DES

3.IDEA & Triple-DES

4.None of the mentioned

Question:

Which is better for avoiding jamming?

1.Direct sequence spread spectrum

2.Frequency hopping spread spectrum

3.Time hopping spread spectrum

4.None of the mentioned

Question:

Which is more bandwidth efficient?

1.Direct sequence spread spectrum

2.Frequency hopping spread spectrum

3.Time hopping spread spectrum

4.None of the mentioned

Question:

Which is more simpler to implement?

1.Direct sequence spread spectrum

2.Frequency hopping spread spectrum

3.Time hopping spread spectrum

4.None of the mentioned

Question:

Which is more suitable when large number of transmitters are used?

1.Synchronous CDMA

2.Asynchronous CDMA

3.Synchronous & Asynchronous CDMA

4.None of the mentioned

Question:

Which operation is used in encryption using IDEA?

1.Addition modulo 216

2. Bit wise XOR

3.Addition modulo 216 & Bit wise XOR

4.None of the mentioned

Question:

Which should be kept as a secret in public key cryptosystem?

1.Encryption key

2.Decryption key

3.Encryption & Decryption key

4.None of the mentioned

Question:

Which uses orthogonal codes?

1.Synchronous CDMA

2.Asynchronous CDMA

3.Synchronous & Asynchronous CDMA

4.None of the mentioned

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Electrical measurements-Digital Communications MCQs set/14 Sample Test,Sample questions

Question: A cryptographic hash function has variable output length.

Question: A set of numbers is called as super increasing if

Question: CDMA rejects

Question: CDMA uses

Question: Cipher system can be solved effectively by statistically using

Question: Data compression includes

Question: Encryption transformations are known as

Question: Eulerâ€™s totient function is determined by

Question: Examples of hash functions are

Question: For digital signatures private key cryptosystem is used.

Question: For n input bits the number of substitution patterns are

Question: Frequency planning is very essential in

Question: In a trapdoor function, the functions are easy to go in

Question: In cipher feedback method, encryption is done on

Question: In digital communication, interaction between ______ is possible.

Question: In public key cryptosystem which is kept as public?

Question: In public key cryptosystem _____ keys are used for encryption and decryption.

Question: In stream encryption, the key sequence repeats itself.

Question: In this Merkle Hellman method same key is used for encryption and decryption.

Question: In transposition, the plaintext letters are

Question: In which method, key-stream is generated independently?

Question: Knapsack problem can be solved by

Question: Merkle hellman is a symmetric cryptosystem.

Question: PGP offers _____ block ciphers for message encryption.

Question: PGP system uses

Question: Pretty good privacy (PGP) security system uses

Question: Pretty good privacy program is used for

Question: Private key algorithm is used for _____ encryption and public key algorithm is used for _____ encryption.

Question: Processing gain is the ratio of message bandwidth to signal bandwidth.

Question: Public key cryptosystem is also known as

Question: Public key cryptosystem is used for the encryption of

Question: Public key cryptosystem uses same key for both encryption and decryption.

Question: Some advantages of spread spectrum are

Question: Synchronous ciphers uses

Question: The key size of DES is

Question: The substitution of the letters are done

Question: These three ciphers can operate of ______ of plaintext and cipher text.

Question: What is the key size allowed in PGP?

Question: Which algorithm can be used to sign a message?

Question: Which algorithm is used for public key encryption?

Question: Which are called the block ciphers?

Question: Which block cipher has key length of 128 bits?

Question: Which has a key length of 128 bits?

Question: Which is better for avoiding jamming?

Question: Which is more bandwidth efficient?

Question: Which is more simpler to implement?

Question: Which is more suitable when large number of transmitters are used?

Question: Which operation is used in encryption using IDEA?

Question: Which should be kept as a secret in public key cryptosystem?

Question: Which uses orthogonal codes?

More MCQS

Search

Olete Team

Question:
A cryptographic hash function has variable output length.

Question:
A set of numbers is called as super increasing if

Question:
CDMA rejects

Question:
CDMA uses

Question:
Cipher system can be solved effectively by statistically using

Question:
Data compression includes

Question:
Encryption transformations are known as

Question:
Eulerâ€™s totient function is determined by

Question:
Examples of hash functions are

Question:
For digital signatures private key cryptosystem is used.

Question:
For n input bits the number of substitution patterns are

Question:
Frequency planning is very essential in

Question:
In a trapdoor function, the functions are easy to go in

Question:
In cipher feedback method, encryption is done on

Question:
In digital communication, interaction between ______ is possible.

Question:
In public key cryptosystem which is kept as public?

Question:
In public key cryptosystem _____ keys are used for encryption and decryption.

Question:
In stream encryption, the key sequence repeats itself.

Question:
In this Merkle Hellman method same key is used for encryption and decryption.

Question:
In transposition, the plaintext letters are

Question:
In which method, key-stream is generated independently?

Question:
Knapsack problem can be solved by

Question:
Merkle hellman is a symmetric cryptosystem.

Question:
PGP offers _____ block ciphers for message encryption.

Question:
PGP system uses

Question:
Pretty good privacy (PGP) security system uses

Question:
Pretty good privacy program is used for

Question:
Private key algorithm is used for _ encryption and public key algorithm is used for _ encryption.

Question:
Processing gain is the ratio of message bandwidth to signal bandwidth.

Question:
Public key cryptosystem is also known as

Question:
Public key cryptosystem is used for the encryption of

Question:
Public key cryptosystem uses same key for both encryption and decryption.

Question:
Some advantages of spread spectrum are

Question:
Synchronous ciphers uses

Question:
The key size of DES is

Question:
The substitution of the letters are done

Question:
These three ciphers can operate of ______ of plaintext and cipher text.

Question:
What is the key size allowed in PGP?

Question:
Which algorithm can be used to sign a message?

Question:
Which algorithm is used for public key encryption?

Question:
Which are called the block ciphers?

Question:
Which block cipher has key length of 128 bits?

Question:
Which has a key length of 128 bits?

Question:
Which is better for avoiding jamming?

Question:
Which is more bandwidth efficient?

Question:
Which is more simpler to implement?

Question:
Which is more suitable when large number of transmitters are used?

Question:
Which operation is used in encryption using IDEA?

Question:
Which should be kept as a secret in public key cryptosystem?

Question:
Which uses orthogonal codes?