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Chemistry 30 MCQs

1. The proton was discovered by:

A. Rutherford B. Chadwick C. J.J. Thomson D. Millikan

2. The e/m ratio of cathode rays was determined by:

A. J.J. Thomson B. Rutherford C. Millikan D. Bohr

3. The charge on an electron was measured by:

A. Millikan's oil drop experiment B. Thomson's cathode ray C. Rutherford's alpha scattering D. Chadwick's experiment

4. The ground state of hydrogen corresponds to n =

A. 1 B. 2 C. 3 D. ∞

5. The ionization energy of hydrogen is:

A. 13.6 eV B. 10.2 eV C. 3.4 eV D. 1.51 eV

6. The number of orbitals in a subshell is given by:

A. 2l + 1 B. 2n + 1 C. 2l - 1 D. 2n - 1

7. The maximum number of electrons in a shell is:

A. 2n² B. 2n C. n² D. n

8. The spin quantum number of an electron can have values:

A. +½ and -½ B. +1 and -1 C. 0 and 1 D. +1, 0, -1

9. The Balmer series of hydrogen lies in the:

A. Visible region B. UV region C. Infrared region D. Radio region

10. The azimuthal quantum number l = 2 corresponds to which subshell?

A. d B. s C. p D. f

11. The electron configuration of Zn (Z=30) is:

A. [Ar] 3d¹⁰ 4s² B. [Ar] 3d¹⁰ 4s¹ C. [Ar] 3d⁹ 4s² D. [Ar] 3d⁸ 4s²

12. The number of nodes in a 3s orbital is:

A. 2 B. 1 C. 3 D. 0

13. The shape of CH₄ is:

A. Tetrahedral B. Trigonal planar C. Linear D. Bent

14. The bond in KCl is:

A. Ionic B. Covalent C. Metallic D. Hydrogen

15. The hybridisation of carbon in methane is:

A. sp³ B. sp² C. sp D. sp³d

16. The molecule with polar bonds but nonpolar overall is:

A. CO₂ B. H₂O C. NH₃ D. HCl

17. The type of bond present in solid sodium is:

A. Metallic B. Ionic C. Covalent D. Hydrogen

18. The number of lone pairs on central atom in XeF₆ is:

A. 1 B. 2 C. 3 D. 0

19. The Lewis structure of SO₃ has:

A. Three S=O double bonds and no lone pairs on S B. Two double bonds and one single C. One double and two single D. All single bonds

20. The equilibrium constant is temperature dependent. For an exothermic reaction, increasing temperature will:

A. Decrease K B. Increase K C. No change D. Increase or decrease depending on pressure

21. The equilibrium constant for the reverse reaction is:

A. 1/K B. K C. K² D. K

22. The pOH of a solution is related to pH by:

A. pH + pOH = 14 B. pH - pOH = 14 C. pH × pOH = 14 D. pH / pOH = 14

23. A salt of a strong acid and strong base (e.g., NaCl) will give a solution that is:

A. Neutral B. Acidic C. Basic D. Depends on concentration

24. The pH of a buffer solution containing 0.1 M acetic acid and 0.1 M sodium acetate (pKa=4.76) is:

A. 4.76 B. 4.76 C. 5.76 D. 3.76

25. In a galvanic cell, the anode is:

A. Negative electrode B. Positive electrode C. Neutral D. Salt bridge

26. The amount of substance deposited during electrolysis is directly proportional to the charge passed. This is Faraday's:

A. First law B. Second law C. Third law D. Law of electrolysis

27. The anode in a lead-acid battery is made of:

A. Lead (Pb) B. Lead dioxide (PbO₂) C. Lead sulfate (PbSO₄) D. Sulfuric acid

28. The EMF of a lead-acid cell is approximately:

A. 2 V B. 1.5 V C. 1.1 V D. 3.0 V

29. A substance with lower reduction potential is a better:

A. Reducing agent B. Oxidizing agent C. Electrolyte D. Conductor

30. The number of faradays required to deposit one mole of Al from Al³⁺ is:

A. 3 F B. 1 F C. 2 F D. 4 F

Computer Science 30 MCQs

31. Which application helps in graphic design and animation?

A. Adobe Photoshop and Blender B. Microsoft Word C. Excel D. Notepad

32. Which SQL command is used to add new records?

A. INSERT B. SELECT C. UPDATE D. DELETE

33. What does ACID stand for in databases?

A. Atomicity, Consistency, Isolation, Durability B. Accuracy, Completeness, Integrity, Data C. Access, Control, Input, Data D. All, Columns, Index, Data

34. The function of an operating system is to:

A. Manage hardware and software resources B. Create documents C. Design graphics D. Compile programs

35. Which of these is a programming language?

A. Python B. HTML C. CSS D. All of the above

36. What is the purpose of a firewall in a network?

A. To block unauthorized access B. To speed up data transfer C. To store data D. To connect devices

37. An IP address is:

A. A unique identifier for a device on a network B. A type of cable C. A protocol D. A storage device

38. IPv4 addresses are how many bits?

A. 32 bits B. 64 bits C. 128 bits D. 16 bits

39. Data integrity means:

A. Accuracy and consistency of data B. Speed of data access C. Amount of data D. Type of database

40. Which normal form eliminates transitive dependencies?

A. Third Normal Form (3NF) B. First Normal Form C. Second Normal Form D. BCNF

41. A primary key in an ER diagram is shown by:

A. Underlining the attribute B. Bold text C. A different color D. An asterisk

42. A strong entity has:

A. Its own primary key B. No primary key C. Foreign key only D. No attributes

43. Cache memory is used to:

A. Speed up access to frequently used data B. Store data permanently C. Replace RAM D. Replace hard disk

44. Which mode is used to open a file for writing (creates new or overwrites)?

A. "w" B. "r" C. "a" D. "r+"

45. When you open a file in "w" mode, what happens if the file already exists?

A. It is overwritten B. Data is appended C. An error occurs D. It is opened in read-only mode

46. What does fflush() do?

A. Flushes the output buffer to the file B. Closes the file C. Reads from file D. Sets file pointer

47. How can a function receive an array in C?

A. As a pointer to the first element B. As a copy of the entire array C. As a parameter with size D. As a reference

48. A webcam is an:

A. Input device B. Output device C. Storage device D. Processing device

49. A trackball is a pointing device where:

A. A ball is moved to control the cursor B. A finger is moved on a flat surface C. A pen is used to point D. A joystick is moved

50. Which of the following is application software?

A. Microsoft Word B. Windows C. Linux D. macOS

51. What is the purpose of referential integrity in Access?

A. To ensure relationships are valid and consistent B. To sort data C. To filter data D. To create forms

52. What is the output: for(i=0; i<2; i++) { for(j=0; j<2; j++) { printf("*"); } }

A. **** B. ** C. ** D. *

53. In a for loop, the initialization part is executed:

A. Once at the beginning B. Every iteration C. Never D. Only if condition is true

54. What is open-source software?

A. Software with source code available for modification and distribution B. Software that is free to use C. Software that cannot be modified D. Software with no license

55. What does the term "cybersecurity" refer to?

A. The practice of protecting systems, networks, and data from digital attacks B. Physical security of computers C. Environmental protection D. Network cabling

56. Which function is used to concatenate text strings?

A. CONCATENATE or & B. SUM C. AVERAGE D. VLOOKUP

57. A row in a table is called a:

A. Record B. Field C. Column D. Key

58. The File Explorer in Windows is used to:

A. Browse and manage files and folders B. Change system settings C. Install software D. Browse the internet

59. How do you permanently delete a file in Windows?

A. Shift + Delete B. Delete C. Ctrl + D D. Alt + Delete

60. What is the main purpose of a word processor?

A. To create, edit, and format text documents B. To create spreadsheets C. To manage databases D. To create presentations

English 10 MCQs

61. What can lack of water cause?

A. Fatigue and headaches B. Increased energy C. Better memory D. Weight gain

62. Water helps with which bodily function?

A. Absorption B. Vision C. Hearing D. Smell

63. The word "fatigue" means:

A. Extreme tiredness B. Excitement C. Hunger D. Thirst

64. How do friends help reduce stress?

A. By providing support B. By ignoring problems C. By creating conflicts D. By distancing themselves

65. The passage suggests that friendship helps us:

A. Grow as individuals B. Become wealthy C. Become famous D. Travel more

66. Read the passage: "Social media has transformed how we communicate. It allows instant connection with people worldwide and can be a source of information and entertainment. However, excessive use can lead to anxiety, poor sleep, and reduced face-to-face interactions. It is important to use social media mindfully." What is the main idea?

A. Social media has both benefits and risks B. Social media is entirely bad C. Social media is only for entertainment D. Social media has no effect on health

67. Which of these is NOT mentioned as an effect?

A. Increased physical fitness B. Anxiety C. Poor sleep D. Reduced interactions

68. What are examples of renewable energy mentioned?

A. Solar, wind, hydroelectric B. Coal, oil, gas C. Nuclear, geothermal D. Biomass, tidal

69. What is the main message?

A. Simple acts of kindness can make a big difference B. Kindness is unnecessary C. Kindness takes too much time D. Kindness is only for special occasions

70. What does travel expose people to?

A. New cultures and perspectives B. Only new foods C. Only new languages D. Only new climates

Maths 30 MCQs

71. Find the point of intersection of x+y=5 and x-y=1.

A. (3,2) B. (2,3) C. (4,1) D. (1,4)

72. What is the x-intercept of 3x + 4y = 12?

A. 4 B. 3 C. 12 D. -4

73. What is the radius of the circle x² + y² + 4x - 6y = 12?

A. 5 B. 25 C. √5 D. 12

74. What is the area of the triangle with vertices (1,2), (4,2), and (1,5)?

A. 4.5 B. 6 C. 9 D. 3

75. What is the derivative of f(x) = cos x?

A. -sin x B. sin x C. cos x D. -cos x

76. What is the derivative of f(x) = x⋅sin x? (Product rule)

A. sin x + x cos x B. cos x + x sin x C. sin x - x cos x D. cos x - x sin x

77. What is the derivative of f(x) = 3x² + 2x + 1 at x=1?

A. 8 B. 6 C. 4 D. 10

78. What is the derivative of f(x) = (x²+1)²?

A. 4x(x²+1) B. 2x(x²+1) C. 4x(x²+1) D. 2x(x²+1)

79. What is the derivative of f(x) = e^(2x)?

A. 2e^(2x) B. e^(2x) C. 2xe^(2x) D. e^(2x)

80. What is the derivative of f(x) = (x^2 + 1)^3?

A. 6x(x²+1)² B. 3x(x²+1)² C. 6x²(x²+1)² D. 3(x²+1)²

81. What is ∫ sec² x dx?

A. tan x + C B. sec x tan x + C C. csc x + C D. cot x + C

82. What is ∫ e^{2x} dx?

A. (1/2)e^{2x} + C B. 2e^{2x} + C C. e^{2x} + C D. e^{2x}/2

83. Evaluate ∫₁² (3x²) dx.

A. 7 B. 8 C. 6 D. 5

84. What is ∫ (5x⁴) dx?

A. x⁵ + C B. 5x⁵/5 + C = x⁵ + C C. 20x³ + C D. 5x⁵ + C

85. What is the GCD of 12 and 18?

A. 6 B. 3 C. 12 D. 9

86. What is the value of i³?

A. -i B. i C. -1 D. 1

87. The number 0 belongs to which sets?

A. All of the above (integers, rationals, reals) B. Only integers C. Only rationals D. Only reals

88. Find the 15th term of sequence 5,10,15,20,...?

A. 75 B. 70 C. 80 D. 65

89. What is the sum of squares of first n natural numbers?

A. n(n+1)(2n+1)/6 B. n(n+1)/2 C. n²(n+1)/4 D. n(n+1)(2n+1)/6

90. What is the sum of the first 8 terms of A.P 1, 2, 3, ...?

A. 36 B. 28 C. 40 D. 32

91. What is the mode of 2, 3, 3, 4, 5, 5, 5?

A. 5 B. 3 C. 4 D. 2

92. What is the probability of drawing an ace from a deck of cards?

A. 1/13 B. 4/52 C. 1/13 D. Both A and C

93. What is the range of 3, 5, 7, 9, 11?

A. 8 B. 4 C. 6 D. 10

94. What is the probability of drawing a red king from a deck?

A. 1/26 B. 1/13 C. 1/52 D. 2/52

95. What is the value of cos 45°?

A. √2/2 B. √3/2 C. 1/2 D. 1

96. What is the value of cos(90° - θ)?

A. sin θ B. cos θ C. tan θ D. cot θ

97. What is the value of cos(π/2)?

A. 0 B. 1 C. 1/2 D. √2/2

98. What is the direction (angle) of vector (3,4) with the positive x-axis?

A. tan⁻¹(4/3) B. tan⁻¹(3/4) C. sin⁻¹(4/5) D. cos⁻¹(3/5)

99. What is the magnitude of the vector (6,8)?

A. 10 B. 14 C. 2 D. 100

100. What is the cross product of (1,0,0) and (0,0,1)?

A. (0,-1,0) B. (0,1,0) C. (1,0,0) D. (0,0,1)

Physics 30 MCQs

101. A galvanometer can be converted into a voltmeter by connecting:

A. A high resistance in series B. A low resistance in parallel C. A high resistance in parallel D. A low resistance in series

102. A galvanometer can be converted into an ammeter by connecting:

A. A low resistance in parallel B. A high resistance in series C. A high resistance in parallel D. A low resistance in series

103. The resistance of an ammeter should be:

A. Very low B. Very high C. Infinite D. Zero

104. The sensitivity of a galvanometer can be increased by:

A. Increasing the number of turns B. Decreasing the magnetic field C. Decreasing area D. Using a weaker spring

105. Electric field lines originate from:

A. Positive charges B. Negative charges C. Both equally D. Neutral charges

106. A dielectric material inserted between capacitor plates:

A. Increases capacitance B. Decreases capacitance C. Has no effect D. Destroys the capacitor

107. The acceleration due to gravity on Earth is approximately:

A. 9.8 m/s² B. 9.8 m/s C. 9.8 m²/s D. 9.8 km/s²

108. Kepler's third law states that the square of the orbital period is proportional to:

A. Cube of the semi-major axis B. Square of the semi-major axis C. Radius of orbit D. Mass of planet

109. The zeroth law of thermodynamics is the basis for the measurement of:

A. Temperature B. Heat C. Work D. Pressure

110. In an isothermal process, the temperature of the system remains:

A. Constant B. Increasing C. Decreasing D. Zero

111. A heat engine operates between two reservoirs. Its efficiency is given by:

A. η = 1 - T_c/T_h B. η = T_c/T_h C. η = 1 - T_h/T_c D. η = T_h/T_c

112. The SI unit of force is:

A. Newton B. Joule C. Watt D. Pascal

113. The acceleration of an object is inversely proportional to:

A. Mass B. Force C. Velocity D. Time

114. Friction is a force that:

A. Opposes motion B. Supports motion C. Has no direction D. Is always present

115. An object is in equilibrium when the net force acting on it is:

A. Zero B. Maximum C. Constant D. Changing

116. The condition for translational equilibrium is:

A. ΣF = 0 B. Στ = 0 C. ΣF ≠ 0 D. Σv = 0

117. The impulse-momentum theorem states that impulse equals:

A. Change in momentum B. Change in kinetic energy C. Change in velocity D. Change in acceleration

118. The prefix "micro" represents:

A. 10⁻⁶ B. 10⁻³ C. 10⁶ D. 10³

119. Time dilation means that a moving clock runs:

A. Slower B. Faster C. At the same rate D. Irregularly

120. The wave nature of electrons was experimentally confirmed by:

A. Davisson and Germer B. Compton C. Einstein D. Planck

121. According to Planck's law, the energy of an oscillator is quantized as:

A. E = nhf B. E = hf C. E = mc² D. E = kT

122. The ultraviolet catastrophe was resolved by:

A. Planck's quantum hypothesis B. Einstein's relativity C. Bohr's model D. Compton effect

123. The centripetal acceleration is given by:

A. a_c = v²/r B. a_c = ω²r C. Both A and B D. a_c = v r

124. The moment of inertia I of a rigid body is the rotational analog of:

A. Mass B. Force C. Velocity D. Acceleration

125. For a hoop rolling down an incline, the acceleration is:

A. a = ½ g sinθ B. a = g sinθ C. a = 2/3 g sinθ D. a = 1/3 g sinθ

126. If the force is perpendicular to the displacement, the work done is:

A. Zero B. Positive C. Negative D. Maximum

127. Power is defined as the rate of doing work. Its SI unit is:

A. Watt B. Joule C. Newton D. Pascal

128. The work done by a non-conservative force (like friction) depends on:

A. Path taken B. Displacement only C. Speed D. Mass

129. A wire of resistance R is stretched to double its original length while its diameter is halved. What is the new resistance?

A. 2 times B. 4 times C. 6 times D. 8 times

130. A 4Ω, 6Ω, and 10Ω resistor are connected in series to a 40V battery. What is the voltage across the 6Ω resistor?

A. 8V B. 12V C. 16V D. 20V

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