Final Exam Model Paper 1

(Any two.)

• a.HDMI (High Definition Multimedia Interface): it carries high-definition video and sound together on a single cable. (VGA carries only analog video.)
• b.Ethernet (an RJ-45 socket): it joins a computer to a wired LAN with a network cable.

a. Multiply each digit by its place value and add:
1 × 2⁵ + 1 × 2⁴ + 0 × 2³ + 1 × 2² + 0 × 2¹ + 1 × 2⁰ = 32 + 16 + 0 + 4 + 0 + 1 = 53
So (110101)₂ = (53)₁₀.

b. Divide by 2 until the quotient is 0, and read the remainders from the bottom up:

So (58)₁₀ = (111010)₂. Check: 32 + 16 + 8 + 2 = 58.

a.

  1 1 0 1 1+   1 1 0 1-----------1 0 1 0 0 0

Working from the right: 1 + 1 = 10 (write 0, carry 1); 1 + 0 + 1 = 10 (0, carry 1); 0 + 1 + 1 = 10 (0, carry 1); 1 + 1 + 1 = 11 (1, carry 1); 1 + 1 = 10 (0, carry 1); the last carry is written in front. So the sum is (101000)₂. Check: 27 + 13 = 40.

b.

  1 1 0 1 0-     1 1 1-----------  1 0 0 1 1

From the right: 0 − 1 borrows from the 1 next to it (10 − 1 = 1); that column is now 0, and 0 − 1 borrows again, from the 1 two places on, through the 0 between, which becomes 1 (10 − 1 = 1); the middle column is then 1 − 1 = 0; the column that lent is 0 − 0 = 0; the first 1 stays. So the difference is (10011)₂. Check: 26 − 7 = 19.

<h2>Places to visit in Pokhara</h2><ol>  <li>Phewa Lake</li>  <li>Sarangkot</li>  <li>Davis Falls</li></ol>

The browser shows the heading in bold, larger than the text, and the three places numbered 1, 2 and 3.

(Any two.)

Any two, each with its reason:

• Don’t post photos of documents. An admit card shows her name, photo, school and date of birth together; a stranger could use them to pretend to be her (identity theft) or to trick her or her friends.
• Keep the account private, and accept only people she knows in real life, because a public post can be seen, copied and shared by anyone.
• Think before posting. A post can be copied and kept forever, even after it is deleted, so share the happy news in words, or a photo with no details on it.
• Keep private things private: her school, her routine and where she is, so that nobody can find or follow her.

An identifier is a name a programmer gives to something in a program, such as a variable: total_marks, name.
Rules (any two):

• It must start with a letter or an underscore _, never a digit.
• It may contain only letters, digits and underscores: no spaces or other symbols such as - or @.
• It can’t be a Python keyword such as if or while.
• It is case-sensitive: age and Age are different identifiers.

n = 472s = 0while n > 0:    d = n % 10    s = s + d    n = n // 10print("Sum of digits:", s)

Sum of digits: 13

n % 10 takes the last digit and n // 10 drops it, so the loop adds 2, 7 and 4.

length = float(input("Length of the plot (m): "))breadth = float(input("Breadth of the plot (m): "))area = length * breadthfence = 2 * (length + breadth)print("Area:", area, "square meters")print("Fence needed:", fence, "meters")

Length of the plot (m): 12Breadth of the plot (m): 8Area: 96.0 square metersFence needed: 40.0 meters

(Any correct program.)

Software is the set of instructions, programs and data that tells a computer what to do. It is the intangible part of a computer: it can’t be touched.

Kinds of system software (any three):

• Operating system: controls and manages the whole working of the computer (programs, memory, files and devices) and gives the user an interface. Examples: Windows, Linux, Android.
• Language processor (translator): translates programs written in assembly or a high-level language into machine language: an assembler, a compiler or an interpreter.
• Utility software: maintains the computer and its data: antivirus, backup, file compression and disk defragmenter programs.
• Device driver: a program that controls one particular device, such as a printer, so that the operating system can use it.

3, 4, 1, 2:

• 3, when space key pressed (Events): a hat block, the only kind that can start a script, so it goes on top.
• 4, turn ↻ 15 degrees (Motion).
• 1, say Namaste! for 2 seconds (Looks).
• 2, play sound Meow until done (Sound).

<form name="fair" method="post">  Full name: <input type="text" name="fullname"><br><br>  Event:  <input type="radio" name="event" value="quiz"> Quiz  <input type="radio" name="event" value="poster"> Poster<br><br>  <input type="submit" value="Submit">  <input type="reset" value="Reset"></form>

The two radio buttons share name="event", so choosing one clears the other. <br> puts each part on its own line. (<label> tags, or <button> for the buttons, are also correct.)

Malware (malicious software) is any program written to do harm to a computer or its user: to damage, steal, spy or take control, put on a device without the owner’s permission.

Any three:

• Virus: attaches itself to a program or file and runs when that is opened; it may delete or damage files, and spreads with the files it is in (pen drives, downloads, attachments).
• Worm: copies itself from computer to computer by itself, through a network, using holes in software that isn’t updated.
• Trojan horse: pretends to be a useful program, such as a free game, but does harm once the user installs it, often letting an attacker in.
• Ransomware: encrypts the user’s files and demands money for the key.
• Spyware: secretly watches what the user does and sends it to someone; a keylogger records every key pressed, passwords included.
• Adware: floods the device with advertisements, often slowing it down.

# Input: the hours parkedhours = int(input("Enter the hours parked: "))# Work out the charge from the tableif hours <= 1:    charge = 20             # the minimum chargeelif hours <= 3:    charge = hours * 25else:    charge = hours * 40# Output: the chargeprint("Parking charge = Rs", charge)

Enter the hours parked: 4Parking charge = Rs 160

Each band: 1 hour gives Rs 20, 3 hours 3 × 25 = Rs 75, 4 hours 4 × 40 = Rs 160. (Any correct program.)