JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 490 · 40 questions

Code tip (Line by line): let x = 5; makes a variable x holding 5; x = x + 2; changes it to 7. console.log(…) writes in the console; alert(…) shows a pop-up box. Text in quotes + anything = joined text: "5" + 3 → "53".

1. 1.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
2. 2.⚡ What number does this code print?
   let a = 52;
   let b = 14;
   console.log(a + b);
3. 3.⚡ What number does this code print?
   let a = 33;
   let b = 38;
   console.log(a + b);
4. 4.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) for (d) console.log()
5. 5.⚡ What number does this code print?
   let a = 23;
   let b = 4;
   console.log(a + b);
6. 6.⚡ What does this code show?
   let name = "Meera";
   console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Meera! (d) Meera
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 8;
   console.log(x + y); (a) 18 (b) 9 (c) Error
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 8;
   console.log(x + y); (a) Error (b) 12 (c) 48
9. 9.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) in the console (d) on the title bar
10. 10.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
11. 11.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 7;
    coins = coins - 4;
    console.log(coins);
12. 12.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) for (d) alert()
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 8 (b) Error (c) 71
14. 14.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) Error (b) 88 (c) 16
16. 16.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <js> (d) <script>
17. 17.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) alert() (d) if
18. 18.⚡ What number does this code print?
    let score = 8;
    score = score + 2;
    score = score - 9;
    console.log(score);
19. 19.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 17;
    apples = apples - 8;
    console.log(apples);
20. 20.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 12 (b) 66 (c) Error
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) Error (b) 5 (c) 41
23. 23.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Aman (c) Welcome, name! (d) name
24. 24.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Arjun! (c) Arjun (d) name
25. 25.⚡ What number does this code print?
    let a = 15;
    let b = 8;
    console.log(a + b);
26. 26.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) name (c) Hello, Kabir! (d) Hello, name!
27. 27.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) name (b) Riya (c) Welcome, Riya! (d) Welcome, name!
28. 28.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) let (d) console.log()
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) Error (b) 35 (c) 8
30. 30.⚡ What number does this code print?
    let a = 52;
    let b = 4;
    console.log(a - b);
31. 31.⚡ What number does this code print?
    let a = 36;
    let b = 2;
    console.log(a - b);
32. 32.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) for (d) console.log()
33. 33.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 7;
    apples = apples - 4;
    console.log(apples);
34. 34.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 8;
    apples = apples - 4;
    console.log(apples);
35. 35.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Arjun (c) Well done, name! (d) Well done, Arjun!
36. 36.⚡ What number does this code print?
    let a = 40;
    let b = 1;
    console.log(a + b);
37. 37.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Arjun (b) name (c) Welcome, Arjun! (d) Welcome, name!
38. 38.⚡ What number does this code print?
    let score = 20;
    score = score + 11;
    score = score - 9;
    console.log(score);
39. 39.⚡ What number does this code print?
    let a = 36;
    let b = 35;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let runs = 16;
    runs = runs + 12;
    runs = runs - 26;
    console.log(runs);

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