JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 263 · 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) give (b) let (c) make (d) put
2. 2.⚡ What number does this code print?
   let coins = 10;
   coins = coins + 18;
   coins = coins - 12;
   console.log(coins);
3. 3.⚡ What number does this code print?
   let a = 5;
   let b = 12;
   console.log(a * b);
4. 4.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 7;
   console.log(x + y); (a) 97 (b) Error (c) 16
6. 6.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) let (d) for
7. 7.⚡ What number does this code print?
   let a = 23;
   let b = 13;
   console.log(a + b);
8. 8.⚡ What number does this code print?
   let a = 26;
   let b = 12;
   console.log(a + b);
9. 9.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 13 (b) Error (c) 4
11. 11.⚡ What number does this code print?
    let a = 7;
    let b = 9;
    console.log(a * b);
12. 12.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 18;
    marks = marks - 24;
    console.log(marks);
13. 13.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) Hello, Zoya! (d) name
14. 14.⚡ What number does this code print?
    let a = 24;
    let b = 23;
    console.log(a - b);
15. 15.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) alert() (d) console.log()
16. 16.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 12;
    coins = coins - 21;
    console.log(coins);
17. 17.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 18;
    apples = apples - 25;
    console.log(apples);
18. 18.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, Arjun! (b) name (c) Arjun (d) Hi, name!
19. 19.⚡ What number does this code print?
    let a = 7;
    let b = 6;
    console.log(a * b);
20. 20.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Riya! (c) name (d) Riya
21. 21.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
22. 22.⚡ What number does this code print?
    let a = 47;
    let b = 1;
    console.log(a + b);
23. 23.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) alert() (d) let
24. 24.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) Well done, Aman! (d) name
25. 25.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 3;
    marks = marks - 13;
    console.log(marks);
26. 26.⚡ What number does this code print?
    let score = 22;
    score = score + 20;
    score = score - 24;
    console.log(score);
27. 27.⚡ What number does this code print?
    let a = 9;
    let b = 11;
    console.log(a * b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 9 (b) 72 (c) Error
29. 29.⚡ What number does this code print?
    let a = 58;
    let b = 21;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 3;
    runs = runs - 1;
    console.log(runs);
31. 31.⚡ What number does this code print?
    let a = 49;
    let b = 3;
    console.log(a - b);
32. 32.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) Hello, Zoya! (c) name (d) Hello, name!
33. 33.⚡ What number does this code print?
    let a = 35;
    let b = 28;
    console.log(a - b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 96 (b) Error (c) 15
35. 35.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 4;
    coins = coins - 2;
    console.log(coins);
36. 36.⚡ What number does this code print?
    let a = 26;
    let b = 4;
    console.log(a + b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 12 (b) 3 (c) Error
38. 38.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 6;
    apples = apples - 6;
    console.log(apples);
39. 39.⚡ What number does this code print?
    let a = 39;
    let b = 14;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let a = 19;
    let b = 1;
    console.log(a - b);

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