JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 564 · 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.⚡ What number does this code print?
   let a = 8;
   let b = 12;
   console.log(a * b);
2. 2.⚡ What number does this code print?
   let score = 7;
   score = score + 7;
   score = score - 12;
   console.log(score);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 4;
   console.log(x + y); (a) 13 (b) Error (c) 94
4. 4.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) let (d) console.log()
5. 5.⚡ What does alert() show? (a) a new tab (b) a table (c) a picture (d) a pop-up box
6. 6.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the console (d) in the address bar
7. 7.⚡ What number does this code print?
   let apples = 15;
   apples = apples + 20;
   apples = apples - 27;
   console.log(apples);
8. 8.⚡ What does this code show?
   let name = "Kabir";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) Kabir (c) Well done, Kabir! (d) name
9. 9.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
10. 10.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) console.log() (d) alert()
11. 11.⚡ What number does this code print?
    let a = 41;
    let b = 9;
    console.log(a + b);
12. 12.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) alert() (d) console.log()
13. 13.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, Arjun! (b) Arjun (c) name (d) Hello, name!
14. 14.⚡ What number does this code print?
    let a = 11;
    let b = 4;
    console.log(a * b);
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) console.log() (d) if
16. 16.⚡ What number does this code print?
    let a = 9;
    let b = 3;
    console.log(a * b);
17. 17.⚡ What number does this code print?
    let a = 20;
    let b = 30;
    console.log(a + b);
18. 18.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 2;
    apples = apples - 1;
    console.log(apples);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) 16 (b) 79 (c) Error
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 12 (b) Error (c) 39
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 5 (b) 41 (c) Error
22. 22.⚡ What number does this code print?
    let score = 16;
    score = score + 20;
    score = score - 34;
    console.log(score);
23. 23.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) console.log() (d) for
24. 24.⚡ What number does this code print?
    let a = 3;
    let b = 7;
    console.log(a * b);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 5 (b) Error (c) 32
26. 26.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 6;
    runs = runs - 21;
    console.log(runs);
27. 27.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
28. 28.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Welcome, name! (c) name (d) Aman
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 15 (b) 69 (c) Error
30. 30.⚡ What number does this code print?
    let marks = 17;
    marks = marks + 9;
    marks = marks - 26;
    console.log(marks);
31. 31.⚡ What number does this code print?
    let a = 33;
    let b = 35;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 13;
    apples = apples - 9;
    console.log(apples);
33. 33.⚡ What number does this code print?
    let a = 4;
    let b = 3;
    console.log(a * b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 46 (b) 10 (c) Error
35. 35.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) Zoya (c) Hi, name! (d) name
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) Error (b) 77 (c) 14
37. 37.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) name (c) Well done, Aman! (d) Well done, name!
38. 38.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) the domain name (d) only colours
39. 39.⚡ What number does this code print?
    let a = 43;
    let b = 7;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let runs = 12;
    runs = runs + 15;
    runs = runs - 20;
    console.log(runs);

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