JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 318 · 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 JavaScript word repeats code? (a) let (b) if (c) console.log() (d) for
2. 2.⚡ What number does this code print?
   let apples = 28;
   apples = apples + 9;
   apples = apples - 37;
   console.log(apples);
3. 3.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a table (d) a new tab
4. 4.⚡ What number does this code print?
   let a = 52;
   let b = 1;
   console.log(a + b);
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 7;
   console.log(x + y); (a) 77 (b) 14 (c) Error
6. 6.⚡ What number does this code print?
   let apples = 10;
   apples = apples + 11;
   apples = apples - 3;
   console.log(apples);
7. 7.⚡ What does this code show?
   let name = "Arjun";
   alert("Welcome, " + name + "!"); (a) name (b) Welcome, Arjun! (c) Arjun (d) Welcome, name!
8. 8.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) alert() (d) console.log()
9. 9.⚡ What number does this code print?
   let runs = 20;
   runs = runs + 18;
   runs = runs - 11;
   console.log(runs);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 4 (c) 22
11. 11.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
12. 12.⚡ What number does this code print?
    let a = 7;
    let b = 9;
    console.log(a * b);
13. 13.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) let (d) if
14. 14.⚡ What number does this code print?
    let a = 60;
    let b = 13;
    console.log(a + b);
15. 15.⚡ Which JavaScript word writes in the console? (a) for (b) if (c) let (d) console.log()
16. 16.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) on the title bar (d) in the address bar
17. 17.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Arjun (c) name (d) Welcome, Arjun!
18. 18.⚡ What number does this code print?
    let a = 31;
    let b = 12;
    console.log(a - b);
19. 19.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
20. 20.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
21. 21.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Zoya! (c) Hello, name! (d) Zoya
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 58 (b) Error (c) 13
23. 23.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .css (d) .html
24. 24.⚡ What number does this code print?
    let score = 18;
    score = score + 9;
    score = score - 15;
    console.log(score);
25. 25.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, Zoya! (b) Well done, name! (c) name (d) Zoya
26. 26.⚡ What number does this code print?
    let score = 12;
    score = score + 6;
    score = score - 5;
    console.log(score);
27. 27.⚡ What number does this code print?
    let a = 60;
    let b = 15;
    console.log(a + b);
28. 28.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Kabir (d) Welcome, Kabir!
29. 29.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Zoya (b) name (c) Welcome, name! (d) Welcome, Zoya!
30. 30.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Meera (d) Welcome, Meera!
31. 31.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) Hello, Meera! (d) name
32. 32.⚡ What number does this code print?
    let a = 25;
    let b = 23;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let a = 35;
    let b = 11;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let a = 8;
    let b = 12;
    console.log(a * b);
35. 35.⚡ What number does this code print?
    let a = 35;
    let b = 18;
    console.log(a + b);
36. 36.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Zoya! (c) Well done, name! (d) Zoya
37. 37.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 6;
    coins = coins - 12;
    console.log(coins);
38. 38.⚡ What number does this code print?
    let a = 15;
    let b = 22;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let a = 45;
    let b = 29;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let score = 20;
    score = score + 17;
    score = score - 6;
    console.log(score);

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