MCQ
Input, output and memory devices; storage hierarchy MCQ - Practice Questions with Answers
Solve 25 Input, output and memory devices; storage hierarchy questions for RAS/RPSC preparation.
Practice questions
Q1Consider the following statements: Statement 1: One hexadecimal digit represents 4 binary bits. Statement 2: Two hexadecimal digits therefore represent one byte. Statement 3: Decimal 45 is written as 101101 in binary. Statement 4: Binary 110010 is equal to 48 in decimal. Which statements are correct?
One byte equals 8 bits and one nibble equals 4 bits. They also state that one hexadecimal digit represents exactly 4 binary bits, so two hexadecimal digits represent 8 bits, or one byte. The worked decimal-to-binary example gives 45 as 101101. The worked binary-to-decimal example gives 110010 as 32 + 16 + 2, which is 50, not 48. Therefore the first three statements are correct, while the last statement has the wrong decimal total.
Q2Which sequence correctly follows the usual access-speed order stated in the storage hierarchy, from faster to slower?
The usual speed order is given as registers, cache, RAM, SSD and HDD, with slower levels generally offering greater capacity and lower cost per unit. Registers are inside the CPU and are the fastest. Cache is close to the processor and reduces CPU waiting. RAM holds active programmes and data. SSD and HDD are secondary storage, with SSD usually faster than HDD. The correct sequence is therefore registers, cache, RAM, SSD and HDD.
Q3Consider the following statements. Statement 1: One byte contains 8 bits. Statement 2: One hexadecimal digit represents 4 bits, so two hexadecimal digits represent one byte. Statement 3: The octal number system uses digits 0 to 9. Which statements are correct?
There are two direct memory-unit rules: one byte equals 8 bits, and one hexadecimal digit equals 4 bits. Therefore, two hexadecimal digits equal 8 bits, which is one byte. The octal statement is the trap. Octal is base 8 and uses digits 0 to 7 only. Digits 0 to 9 belong to the decimal system, so the first two statements are correct and the third is not.
Q4Which one of the following statements about secondary storage and access methods is incorrect?
Direct or random access differ from sequential access. Direct access lets the system reach a location without reading all earlier data; SSDs, HDDs and optical discs are listed under this ordinary exam classification. Magnetic tape is described as sequential, meaning data is read in order. That makes it useful for backup and archives but unsuitable for fast daily retrieval of a single small file. Secondary storage is non-volatile, but intensive processing normally requires loading data into RAM.
Q5Match List I with List II. List I: 1. Registers 2. Cache memory 3. RAM 4. SSD List II: a. Flash-based secondary storage, usually faster than HDD b. Very fast memory close to the processor for frequently used data c. Tiny, extremely fast storage locations inside the CPU d. Volatile working memory for active programmes and data
The hierarchy differ by role and closeness to the CPU. Registers are tiny, extremely fast locations inside the CPU. Cache memory is also fast but is placed close to the processor to keep frequently used instructions and data. RAM is the volatile read-write working memory used for active programmes and data. SSD is secondary storage based on flash memory and is usually faster, quieter and more shock-resistant than an HDD. These cues give the pairing registers-c, cache-b, RAM-d and SSD-a.
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More questions
6Which of the following statements is false?
7Consider the following statements. Statement 1: A scanner converts printed text or images into digital form. Statement 2: A printer produces hard copy output on paper. Statement 3: A touchscreen should be remembered only as an output device for exam purposes. Which statements are correct?
8Read the assertion and reason. Assertion (A): A touchscreen should be treated as both an input and an output device. Reason (R): It displays information on the screen and also accepts touch-based commands from the user. Choose the correct answer.
9Assertion (A): A touchscreen should be classified as both an input and an output device. Reason (R): It displays information on the screen and also accepts touch-based selections from the user. Choose the correct answer.
10In a Rajasthan e-Mitra centre, a certificate is scanned for upload and a receipt is printed for the applicant. Which classification is correct for these two actions?
11Which statement best describes RAM in a computer?
12Which of the following is an output device?
13Which of the following input devices allows users to enter alphanumeric characters and special characters into a computer?
14Match the device with its main role. List I: 1. Scanner 2. Printer 3. Speaker 4. Touchscreen List II: a. Audio output b. Both display and input c. Hard copy output d. Converts printed material into digital form
15Consider the following statements. Statement 1: RAM is volatile read-write main memory used for active programmes and data. Statement 2: ROM loses its contents when power is switched off. Statement 3: Cache memory is faster than RAM and is placed close to the processor. Which statements are correct?