CBSE Class 1 Computer Science Microsoft Powerpoint Worksheet - Free Printable

Let's solve the Computer Science Worksheet (Chapter 2) for Class I step by step. Since I can't see the image directly, I'll interpret and answer based on the text you've provided.

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Q1. Tick (√) the machines and cross (×) which are not machines.

Images shown (from left to right):
1. Car 🚗
2. Chair 🪑
3. Clock ⏳
4. Pencil ✏️
5. Sewing machine 🧵
6. Truck 🚛
7. Backpack 🎒
8. Tree 🌲
9. Computer 💻

Now, let’s identify which are machines (devices that help do work) and which are not:

- Car → Machine ✔ (✓)
- Chair → Not a machine ✘ (✗)
- Clock → Machine ✔ (✓) *(It's a mechanical/electronic device)*
- Pencil → Not a machine ✘ (✗)
- Sewing machine → Machine ✔ (✓)
- Truck → Machine ✔ (✓)
- Backpack → Not a machine ✘ (✗)
- Tree → Not a machine ✘ (✗)
- Computer → Machine ✔ (✓)

✔ Machines: Car, Clock, Sewing machine, Truck, Computer
✘ Not machines: Chair, Pencil, Backpack, Tree

Answer:
```
(✓) (✗) (✓) (✗) (✓) (✓) (✗) (✗) (✓)
```

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Q2. Write the names of any two machines that need electricity to work:

Electricity-powered machines:
- Computer
- Fan
- Refrigerator
- TV

Answer:
(a) Computer
(b) Fan

*(Any two electric machines are acceptable.)*

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Q3. Write the names of any two machines that need fuel to work:

Fuel-powered machines:
- Car
- Truck
- Aeroplane
- Bicycle (if motorized)

Answer:
(a) Car
(b) Truck

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Q4. Write the names of any two machines that need human power to work:

Human-powered machines:
- Bicycle
- Sewing machine (manual)
- Hand pump
- Windmill (if manually operated)

Answer:
(a) Bicycle
(b) Hand pump

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Q5. Fill in the blanks using the given hints:

Hints: Time, Mistakes, Easy, Fast, Tired, Computer, Electricity

1. A computer works very ________
→ Fast

2. A computer saves our ________
→ Time

3. A computer never gets ________
→ Tired

4. A computer never makes ________
→ Mistakes

5. Machines make our work ________
→ Easy

6. A computer runs on ________
→ Electricity

7. A ________ is a machine that can do many things at a time.
→ Computer

Completed answers:
1. Fast
2. Time
3. Tired
4. Mistakes
5. Easy
6. Electricity
7. Computer

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Q6. Write True/False:

1. An aeroplane is a machine.
→ True ✔
*(Yes, it's a machine that helps transport people.)*

2. Machines do not save our time.
→ False ✘
*(Machines save time — e.g., washing machine saves time compared to hand-washing.)*

3. A washing machine runs on fuel.
→ False ✘
*(Most run on electricity, not fuel. Some may use gas, but generally not fuel like petrol/diesel. So False for most cases.)*

4. A computer makes mistakes.
→ False ✘
*(Computers don’t make mistakes on their own; errors come from input or programming. But they don’t "make" mistakes inherently.)*

Answers:
1. True
2. False
3. False
4. False

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✔ Final Answers Summary:

#### Q1:
```
(✓) (✗) (✓) (✗) (✓) (✓) (✗) (✗) (✓)
```

#### Q2:
(a) Computer
(b) Fan

#### Q3:
(a) Car
(b) Truck

#### Q4:
(a) Bicycle
(b) Hand pump

#### Q5:
1. Fast
2. Time
3. Tired
4. Mistakes
5. Easy
6. Electricity
7. Computer

#### Q6:
1. True
2. False
3. False
4. False

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Let me know if you'd like this formatted as a printable worksheet!