Solved MODEL QUESTION 2082 – COMPUTER SCIENCE
– Grade IX
Attempt all
questions.
Group ‘A'(10
Marks)
Choose the correct answer. (10x1=10)
Group A: Multiple Choice Questions (10 x 1 = 10 marks)
1.
Which of the
following is the tangible part of a computer?
a. Software b. Freeware
c. Hardware
d.
Firmware
2.
How many
Megabytes are there in 1 Gigabyte?
a. 1024 Megabyte b. 1042 Megabyte
c. 2000 Megabyte d.
2048 Megabyte
3.
Which of the
following devices would you use to transfer a file from one computer to
another?
a. Hard disk b.
Mouse
c. Pen drive d. RAM
4.
Which is the
character that performs an action on the stage of the Scratch window?
a. Sprite b. Stage
c. Backdrop d.
Block
5.
Which of the
following is an empty tag?
a. <ul> b.
<title>
c. <sup> d.
<br>
6.
Which of the
following is the correct syntax for inserting external CSS?
a. <link real="stylesheet"
type="text/CSS" href="file.css">
b. <link reel="stylesheet"
type="css/text" href="file.css">
c. <link rel="stylesheet"
type="text/css" href="css.file">
d. <link rel="stylesheet"
type="text/css" href="file.css">
7.
What does URL
stand for?
a. Unique Resource Location b. Uniform Resource Locator
c. Universal Reference Link d. Unified Retrieval Link
8.
What advice
would you give to a friend who wants to start a blog but doesn't have any
ideas?
a. Stop thinking about the blog.
b. Copy content from a similar blog.
c. Write only about your locality.
d. Choose topic and write in own language.
9.
Which of the
following is an arithmetic operator?
a. > b.
**
c. < d.
\
10.
Why is 3Number
an invalid identifier?
a. It has capital N. b.
It starts with number.
c. It is a keyword. d.
It has only 7 characters.
Group ‘B'
(20 Marks)
Answer the following questions in one
sentence: (10X2=20)
Group
B: Short Answer Questions (10 x 2 = 20 marks)
11. What are the types of computers based on working
principles?
Answer:
a. Analog Computer
b. Digital Computer
c. Hybrid Computer
An analog computer is
a type of computer that works with continuous data, like physical quantities
that change smoothly over time. It uses measurements of things like temperature
or speed.
Example: A thermometer or a speedometer, which give
continuous readings.
A digital computer
works with data in the form of numbers, typically using binary code (0s and
1s). It is the most common type of computer and can perform a wide range of
tasks like calculations, processing text, and running programs.
Example: A personal computer or smartphone.
A hybrid computer
combines the features of both analog and digital computers. It can process
continuous data (like an analog computer) and also handle digital data for more
complex tasks.
Example: A hospital ECG machine that records continuous
signals (analog) and displays them digitally.
12. Write any two differences between impact and
non-impact printers.
Answer:
|
Feature |
Impact
Printer |
Non-Impact
Printer |
|
Printing
Mechanism |
Uses
physical contact (pins strike ribbon) |
Uses
ink spraying (inkjet) or laser technology |
|
Noise |
Noisy
due to mechanical striking action |
Quieter
as there is no physical contact |
13. Convert (10011)₂ into a decimal number system and
(105)₁₀ into an octal number system.
Answer:
o (10011)₂ = 19₁₀
o (105)₁₀ = 151₈
14. Perform (1011)₂ - (101)₂ and (1101)₂ + (1100)₂ binary
operations.
Answer:
o (1011)₂ - (101)₂ = 110₂
o (1101)₂ + (1100)₂ = 11001₂
15. Create a table having two rows and two columns using
HTML tags.
Answer:
<table>
<tr>
<td>Row 1, Column 1</td>
<td>Row 1, Column 2</td>
</tr>
<tr>
<td>Row 2, Column 1</td>
<td>Row 2, Column 2</td>
</tr>
</table>
16. Define social media. List any two examples of social
media platforms.
Answer:
Social media is an online
community where people can create, share and interact with content and
communicate in real time.
Examples:
Facebook, Instagram
17. What are two major benefits of using a blog in
education?
Answer:
The two
major benefits of using a blog in education are:
Blog
enhances the academic writing skill and communication skills.
Blog
promotes collaborative learning.
18. Study the following Python code and answer the
questions below:
a = 2
for k in range(1,
8):
print(a)
a //= 10
How many times does the loop execute?
Answer: The loop executes 7 times.
List the integer type of variables.
Answer: a, k
19. Write the output of the given program and show them in
a dry run table.
Answer:
Dry Run:
Output: The final output is 1101.
20. Write a Python program to enter any three numbers and
display their average.
Answer:
num1 = float(input("Enter
first number"))
num2 = float(input("Enter
second number"))
num3 = float(input("Enter
third number"))
average = (num1 + num2 +
num3) / 3
print(f"The average of {num1},
{num2} and {num3} is {average}")
Group C: Long Answer Questions (5 x 4 = 20 marks)
21. What is a memory unit? Write any three differences
between primary and secondary memories.
Answer:
A memory unit is the
part of the computer system used to store data and instructions temporarily or
permanently.
Any three differences between
primary and secondary memory
|
Feature |
Primary Memory |
Secondary Memory |
|
Definition |
Memory that stores data temporarily and is
directly accessible by the CPU. |
Memory used for long-term storage of data. |
|
Speed |
Faster (since it is directly connected to the
CPU). |
Slower (data needs to be fetched from storage
devices). |
|
Volatility |
Volatile (data is lost when the power is off). |
Non-volatile (data is retained even when the power
is off). |
|
Example |
RAM (Random Access Memory) |
Hard drive, SSD (Solid State Drive), CD/DVD |
22. Arrange the blocks so that the sprite moves to a
random position, waits 1 second, and then plays a sound.
Answer:
The
correct order is:
2. When
Green Flag clicked (Event block)
1. Go to
random position (Motion block)
4. Wait 1
second (Control block)
3. Start
sound Meow (Sound block)
23. Write the HTML code to create the given form.
Answer:
<form>
<label
for="username">Username:</label>
<input type="text"
id="username" name="username"><br><br>
<label
for="password">Password:</label>
<input type="password"
id="password" name="password"><br><br>
<input type="submit"
value="Login">
<input type="reset"
value="Cancel">
</form>
24. Define cybercrime. Explain any three safe browsing
techniques.
Answer:
Cybercrime is illegal activities conducted using computers,
the internet, or other digital devices.
Safe browsing techniques:
v Avoid suspicious links and
websites.
v Use strong passwords.
v Keep software and security
tools updated.
25. Write a Python program that takes the monthly unit
consumption as input and calculates the total bill based on the given criteria.
Answer:
# Input from the user
units_consumed =
int(input("Enter the monthly electricity consumption in units: "))
# Initialize the bill
variable
bill = 0
# Calculate the total bill
based on the given criteria
if units_consumed <= 20:
bill = 30
# Minimum charge for 0-20 units
elif 21 <= units_consumed
<= 45:
bill = 30 + (units_consumed - 20) * 5 # Rs 5 per unit for 21-45 units
else:
bill = 30 + (45 - 20) * 5 + (units_consumed
- 45) * 7 # Rs 7 per unit for above 45
units
# Output the result
print(f"The total
electricity bill for {units_consumed} units is Rs {bill}.")
?ÿ@
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