JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 968 · 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) for (b) let (c) console.log() (d) alert()
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 3;
   console.log(x + y); (a) 83 (b) 11 (c) Error
3. 3.⚡ What does this code show?
   let name = "Meera";
   console.log("Hello, " + name + "!"); (a) name (b) Hello, Meera! (c) Hello, name! (d) Meera
4. 4.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the domain name (d) the page title
5. 5.⚡ What number does this code print?
   let score = 15;
   score = score + 2;
   score = score - 5;
   console.log(score);
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 8;
   console.log(x + y); (a) Error (b) 18 (c) 9
7. 7.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
8. 8.⚡ What number does this code print?
   let a = 26;
   let b = 25;
   console.log(a - b);
9. 9.⚡ What number does this code print?
   let a = 32;
   let b = 14;
   console.log(a + b);
10. 10.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
11. 11.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
12. 12.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) name (b) Aman (c) Well done, Aman! (d) Well done, name!
13. 13.⚡ What number does this code print?
    let a = 54;
    let b = 24;
    console.log(a + b);
14. 14.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Zoya! (c) Zoya (d) Hello, name!
15. 15.⚡ What number does this code print?
    let runs = 12;
    runs = runs + 12;
    runs = runs - 24;
    console.log(runs);
16. 16.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) if (d) console.log()
17. 17.⚡ What number does this code print?
    let coins = 26;
    coins = coins + 5;
    coins = coins - 15;
    console.log(coins);
18. 18.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Welcome, name! (c) name (d) Riya
19. 19.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) Hi, Kabir! (d) name
20. 20.⚡ What number does this code print?
    let a = 4;
    let b = 8;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let a = 7;
    let b = 32;
    console.log(a + b);
22. 22.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) name (c) Hi, name! (d) Riya
23. 23.⚡ What number does this code print?
    let marks = 22;
    marks = marks + 9;
    marks = marks - 15;
    console.log(marks);
24. 24.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) console.log() (d) let
25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Aman! (c) Aman (d) name
26. 26.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) let (d) alert()
27. 27.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Arjun (d) Hello, Arjun!
28. 28.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 19;
    coins = coins - 28;
    console.log(coins);
29. 29.⚡ What number does this code print?
    let a = 36;
    let b = 19;
    console.log(a - b);
30. 30.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 13;
    apples = apples - 36;
    console.log(apples);
31. 31.⚡ What number does this code print?
    let a = 7;
    let b = 2;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let a = 10;
    let b = 10;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let a = 11;
    let b = 11;
    console.log(a * b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 66 (b) 12 (c) Error
35. 35.⚡ 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
36. 36.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 2;
    runs = runs - 12;
    console.log(runs);
37. 37.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 2;
    coins = coins - 6;
    console.log(coins);
38. 38.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, Kabir! (b) Hello, name! (c) Kabir (d) name
39. 39.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) alert() (d) if
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) Error (b) 42 (c) 6

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