Grade 3 Computing Worksheet: Units 3.2, 4.1, 4.2 & 4.3 (Interactive Quiz)

Computing Targeted Unit Assessment
Units: 3.2, 4.1, 4.2 & 4.3 — Cambridge Primary Framework Aligned

Q1. Unit 3.2 [Secret Ciphers] - Complete the keyword definitions:

1. Changing a clear message into a secret code is called E n c __ __ p t →

2. Turning a scrambled secret message back into readable text is D e c __ __ p t →

3. A secret rule or hidden code framework used to mix up letters is a C i p __ __ r →

Q2. Fill in the blanks using the vocabulary database provided below:

Actuator  |  Software  |  Sensor  |  Hardware  |  Input  |  Robot

1. The physical, solid parts of a computer system that you can physically touch are called .

2. A set of digital instructions or apps that tells the computer parts what to do is called .

3. An automatic machine that can look at its environment, process data, and execute tasks is a .

4. To detect real-world data like heat, movement, or lighting shifts, machines use a .

5. A motorized device that allows a machine or mechanical system to move physical objects is an .

6. Devices like mouse controls, microphones, and keyboards are used to send data into a processor.

Q3. Choose the absolute correct choice:

1. If you shift the letter 'A' forward by 2 spaces using a Caesar Cipher wheel, what does it become?

A) B B) C C) D

2. Which component represents software working directly with hardware?

A) A plastic computer case cover B) An unplugged monitor display screen C) A game code command turning on a device vibrator motor

3. What makes a robot different from a standard manual machine like a hand-drill?

A) It can make automated decisions based on real sensor inputs B) It must be powered manually by hand steering permanently C) It cannot move any of its parts at all

4. Which of these devices is an OUTPUT device found around us?

A) Digital Camera Lens Scanner B) LED Traffic Light Matrix Board C) Computer Keyboard System

Q4. Unscramble the core unit vocabulary words:

1. E S N S R O (Detects context inputs) →

2. H I C P E R (Secret code system) →

3. O T O B R M (Automatic programmable machine) →

4. T P U T U O (Brings processed result out) →

Q5. Write TRUE or FALSE for the machine operations:

1. Software can perform processing operations without any hardware structure running it.  → 

2. Robots use sensors to get inputs, process them, and use actuators to make movements.  → 

3. A barcode scanner at a shopping center is an output device.  → 

Q6. Match the devices with their correct system type (Write matching letters A, B, C, or D):

1. Computer Speakers

A. Input device tracking real-world views

2. Digital Web Camera

B. Output device sending audio outwards

3. Automated Vacuum Cleaner

C. Decodes a completely scrambled message

4. Message Decryption

D. Smart robot moving around our homes

Click to View Answer Key Reference

Q1 Secret Ciphers: 1. encrypt, 2. decrypt, 3. cipher

Q2 Vocab Blanks: 1. hardware, 2. software, 3. robot, 4. sensor, 5. actuator, 6. input

Q3 MCQs Keys: 1. B (Letter C), 2. C (Game code command turning on a motor), 3. A (It can make automated decisions), 4. B (LED Traffic Light Matrix Board)

Q4 Word Unscramble: 1. sensor, 2. cipher, 3. robot, 4. output

Q5 True / False: 1. FALSE, 2. TRUE, 3. FALSE

Q6 System Connections: 1 → B, 2 → A, 3 → D, 4 → C

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