JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 970 · 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 runs code when true? (a) for (b) if (c) let (d) console.log()
2. 2.⚡ What number does this code print?
   let a = 17;
   let b = 28;
   console.log(a + b);
3. 3.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
4. 4.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) Well done, Zoya! (b) name (c) Well done, name! (d) Zoya
5. 5.⚡ What does alert() show? (a) a picture (b) a new tab (c) a pop-up box (d) a table
6. 6.⚡ What number does this code print?
   let marks = 10;
   marks = marks + 18;
   marks = marks - 21;
   console.log(marks);
7. 7.⚡ What number does this code print?
   let coins = 17;
   coins = coins + 19;
   coins = coins - 11;
   console.log(coins);
8. 8.⚡ What does this code show?
   let name = "Kabir";
   alert("Hello, " + name + "!"); (a) Kabir (b) Hello, name! (c) name (d) Hello, Kabir!
9. 9.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) alert() (d) for
10. 10.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 17;
    apples = apples - 16;
    console.log(apples);
11. 11.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, Riya! (d) Well done, name!
12. 12.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Zoya (c) Welcome, name! (d) name
13. 13.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) alert() (d) if
14. 14.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) alert() (d) for
15. 15.⚡ Which word makes a new variable? (a) let (b) put (c) make (d) give
16. 16.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) for (d) if
17. 17.⚡ What number does this code print?
    let a = 41;
    let b = 18;
    console.log(a - b);
18. 18.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 16;
    apples = apples - 16;
    console.log(apples);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) 95 (b) Error (c) 14
20. 20.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Meera (b) Hello, Meera! (c) name (d) Hello, name!
21. 21.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 8;
    apples = apples - 35;
    console.log(apples);
22. 22.⚡ What number does this code print?
    let marks = 13;
    marks = marks + 16;
    marks = marks - 29;
    console.log(marks);
23. 23.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Arjun (b) Well done, Arjun! (c) Well done, name! (d) name
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 63 (b) 9 (c) Error
25. 25.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
26. 26.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, Arjun! (b) name (c) Well done, name! (d) Arjun
27. 27.⚡ 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
28. 28.⚡ What number does this code print?
    let a = 10;
    let b = 12;
    console.log(a + b);
29. 29.⚡ What number does this code print?
    let a = 49;
    let b = 8;
    console.log(a - b);
30. 30.⚡ What number does this code print?
    let score = 23;
    score = score + 2;
    score = score - 7;
    console.log(score);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) Error (b) 41 (c) 5
32. 32.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) Well done, name! (c) name (d) Well done, Kabir!
33. 33.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Meera (c) Welcome, Meera! (d) name
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 35 (b) Error (c) 8
35. 35.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) Hello, name! (c) name (d) Riya
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 45 (b) 9 (c) Error
37. 37.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 15;
    apples = apples - 1;
    console.log(apples);
38. 38.⚡ What number does this code print?
    let a = 42;
    let b = 8;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let score = 12;
    score = score + 10;
    score = score - 17;
    console.log(score);
40. 40.⚡ What number does this code print?
    let a = 11;
    let b = 7;
    console.log(a * b);

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