Indian Language School Grade 4 Computer Science Worksheet: Data Storage and Memory

Let's solve the Grade 4 Computer Science Worksheet step by step and explain each answer clearly.

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1. Choose Correct Options

#### a. Which of the following is not a ROM?
- a) DPROM
- b) EPROM
- c) PROM

✔ Answer: a) DPROM

🔍 Explanation:
ROM stands for Read-Only Memory. The common types of ROM are:
- PROM (Programmable ROM)
- EPROM (Erasable Programmable ROM)
- EEPROM (Electrically Erasable Programmable ROM)

There is no such standard type as "DPROM". So, DPROM is not a real type of ROM, making it the correct choice.

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#### b. 1B is equivalent to _________ bits.
- a) 12
- b) 8
- c) 6

✔ Answer: b) 8

🔍 Explanation:
In computing:
- 1 Byte (B) = 8 bits
This is a fundamental concept in data storage.

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#### c. Which of these is not a non-volatile memory?
- a) RAM
- b) ROM
- c) CD

✔ Answer: a) RAM

🔍 Explanation:
- Non-volatile memory retains data even when power is off.
- RAM (Random Access Memory) is volatile — it loses data when the computer is turned off.
- ROM and CD are non-volatile.

So, RAM is not non-volatile.

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#### d. This device is generally used with digital camera for storing data.
- a) Credit card
- b) CD
- c) SD Card

✔ Answer: c) SD Card

🔍 Explanation:
- SD cards (Secure Digital cards) are small, portable storage devices commonly used in digital cameras, smartphones, and other gadgets.
- Credit cards are not used for data storage.
- CDs are too large and not practical for modern cameras.

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#### e. DVD was initially named
- a) Digital Video Disc
- b) Digital Visual Disc
- c) Digital Virtual Disc

✔ Answer: a) Digital Video Disc

🔍 Explanation:
DVD originally stood for Digital Video Disc, designed to store video content. Later, it became more general, but the original name was Digital Video Disc.

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2. Fill in the blanks

We are given a box with words:

```
Non-Volatile 2 data
Primary Sectors
```

And the question:

> a. ___________ memory is the main memory in a computer.

✔ Answer: Primary

🔍 Explanation:
- Primary memory refers to the main memory of a computer, like RAM.
- It is directly accessible by the CPU.
- Secondary memory (like hard drives, USBs) stores data long-term, but primary memory is used for active processing.

So, the sentence becomes:
> Primary memory is the main memory in a computer.

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✔ Final Answers Summary:

#### 1. Choose Correct Options
a) DPROM
b) 8
c) RAM
d) SD Card
e) Digital Video Disc

#### 2. Fill in the blanks
a) Primary

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