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Chemistry 30 MCQs

1. The smallest particle of an element that can take part in a chemical reaction is called:

A. Molecule B. Atom C. Ion D. Electron

2. The charge on an electron is:

A. -1.6 × 10⁻¹⁹ C B. +1.6 × 10⁻¹⁹ C C. 0 D. +1.6 × 10⁻¹⁹ C

3. The mass of an electron is approximately:

A. 9.1 × 10⁻³¹ kg B. 1.67 × 10⁻²⁷ kg C. 1.0 × 10⁻³⁰ kg D. 9.1 × 10⁻²⁸ kg

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

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

5. The Heisenberg uncertainty principle states that it is impossible to determine simultaneously the exact position and exact momentum of a particle. The relation is:

A. Δx · Δp ≥ h/4π B. Δx · Δp ≤ h/4π C. Δx · Δp ≥ h/2π D. Δx · Δp = 0

6. The maximum number of electrons in a subshell is:

A. 2(2l+1) B. 2l+1 C. 2n² D. 2n

7. Hund's rule states that electrons fill orbitals of same energy such that:

A. Maximum multiplicity (parallel spins) B. Pairing occurs first C. Electrons fill lower energy first D. Electrons fill randomly

8. The element with atomic number 24 is chromium. Its electron configuration is:

A. [Ar] 3d⁵ 4s¹ B. [Ar] 3d⁴ 4s² C. [Ar] 3d⁵ 4s² D. [Ar] 3d⁶ 4s¹

9. The quantum mechanical model of the atom uses:

A. Probability of finding electrons (electron cloud) B. Fixed orbits C. Planetary orbits D. Rings

10. The total number of orbitals in a shell with n=4 is:

A. 16 B. 4 C. 8 D. 32

11. The electron affinity is the energy change when an electron is added to a neutral atom. It is most exothermic for halogens because:

A. They have high nuclear charge and small size B. They have low nuclear charge C. They are large D. They have full shells

12. The shape of CO₂ is:

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

13. The bond in F₂ is:

A. Nonpolar covalent B. Polar covalent C. Ionic D. Metallic

14. The bond in diamond is:

A. Covalent B. Ionic C. Metallic D. Van der Waals

15. The hydrogen bond is strongest in:

A. HF B. H₂O C. NH₃ D. CH₄

16. The bond energy is the energy required to break a bond. It is directly proportional to:

A. Bond order B. Bond length C. Electronegativity D. Molecular mass

17. The pi (π) bond is formed by:

A. Side-on overlap of p orbitals B. End-on overlap C. Overlap of s orbitals D. Overlap of d orbitals

18. The hybridisation of sulphur in SF₆ is:

A. sp³d² B. sp³d C. sp³ D. sp²

19. A solution with pH > 7 is:

A. Basic B. Acidic C. Neutral D. Salt

20. The common ion effect is used in qualitative analysis to:

A. Selectively precipitate ions B. Increase solubility C. Change pH D. Act as catalyst

21. The equilibrium constant for the formation of NH₃ from N₂ and H₂ is K. The value of K for the decomposition of NH₃ is:

A. 1/K B. K C. K² D. √K

22. The branch of chemistry that deals with the study of electrical energy from chemical reactions is called:

A. Electrochemistry B. Thermodynamics C. Kinetics D. Spectroscopy

23. An electrochemical cell that converts chemical energy into electrical energy is called:

A. Galvanic (voltaic) cell B. Electrolytic cell C. Fuel cell D. Battery

24. In a galvanic cell, the anode is:

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

25. For the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, the standard cell potential is (E°Zn²⁺/Zn=-0.76 V, E°Cu²⁺/Cu=+0.34 V):

A. 1.10 V B. -1.10 V C. 0.42 V D. 0.76 V

26. The process of electrolysis of water produces:

A. H₂ and O₂ B. H₂ and O₂ C. H₂ and O₂ D. H₂ and O₂

27. Corrosion of iron is an electrochemical process. The anodic reaction is:

A. Fe → Fe²⁺ + 2e⁻ B. O₂ + 2H₂O + 4e⁻ → 4OH⁻ C. Fe²⁺ + 2e⁻ → Fe D. 4OH⁻ → O₂ + 2H₂O + 4e⁻

28. The number of faradays required to deposit one mole of Cu from Cu²⁺ is:

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

29. The standard electrode potential of Cu²⁺/Cu is +0.34 V. Which statement is true about Cu?

A. Cu is a stronger reducing agent than Zn B. Cu²⁺ is a stronger oxidizing agent than Zn²⁺ C. Cu is easily oxidized D. Cu has low reduction potential

30. The standard hydrogen electrode has a potential of 0 V. It consists of:

A. H₂ gas at 1 atm and H⁺ at 1 M B. H₂ gas at 0.5 atm C. H⁺ at 1 M with no H₂ D. Platinum electrode only

Computer Science 30 MCQs

31. Which of these is a programming language?

A. Python B. HTML C. CSS D. XML

32. Which of these is volatile memory?

A. RAM B. ROM C. Hard disk D. SSD

33. Multiprocessing refers to:

A. Using multiple processors B. Using multiple monitors C. Using multiple keyboards D. Multiple programs running

34. The hexadecimal number system uses base:

A. 16 B. 10 C. 2 D. 8

35. A field is:

A. A single piece of data B. A record C. A table D. A database

36. Which layer of the OSI model is responsible for routing?

A. Network layer B. Data link layer C. Physical layer D. Transport layer

37. In the network model, data is organized as:

A. A graph with nodes and edges B. A tree C. A table D. A flat file

38. The ER model was introduced by:

A. Peter Chen B. E.F. Codd C. Charles Bachman D. Bjarne Stroustrup

39. In a switch, can you use strings as cases in C?

A. No B. Yes C. Sometimes D. Only with char

40. A decoder is a combinational circuit that:

A. Converts binary code into a specific output line B. Converts data to binary C. Adds numbers D. Stores data

41. In C, the int data type typically occupies:

A. 4 bytes B. 2 bytes C. 1 byte D. 8 bytes

42. Which function reads a character from a file?

A. fgetc() B. fgets() C. fscanf() D. fread()

43. The fread() function is used for:

A. Reading binary data B. Reading text characters C. Reading formatted data D. Reading strings

44. The static keyword in a function variable means:

A. The variable retains its value between calls B. The variable is local C. The variable is global D. The variable is constant

45. What is call by value?

A. Passing a copy of the variable's value B. Passing the variable's address C. Passing the variable's reference D. Passing the function

46. DNS stands for:

A. Domain Name System B. Digital Network Service C. Data Name Server D. Dynamic Network System

47. A search engine is a:

A. Web-based tool to search for information B. Type of browser C. Email client D. File transfer program

48. What is a cookie?

A. A small text file stored by a website on a user's computer B. A type of virus C. A hardware device D. A programming language

49. In a bus topology, all devices are connected to:

A. A single central cable B. A central hub C. A ring D. A mesh

50. Which generation of computers used integrated circuits (ICs)?

A. Third generation B. First generation C. Second generation D. Fourth generation

51. What does ROM stand for?

A. Read Only Memory B. Random Only Memory C. Read Operate Memory D. Rapid Output Memory

52. What is the primary purpose of a form in Access?

A. To enter and edit data B. To store data C. To print data D. To query data

53. The break statement in a loop is used to:

A. Exit the loop immediately B. Continue to the next iteration C. End the program D. Skip the condition

54. In a for loop, the increment part is executed:

A. After each iteration (body) B. Before each iteration C. Only once D. Never

55. An unbound control in a form is not connected to:

A. A data source B. A report C. A table D. A query

56. A CD/DVD drive is classified as a:

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

57. What is the purpose of conditional formatting?

A. To apply formatting based on cell values B. To sort data C. To create formulas D. To insert charts

58. Which function is used to concatenate text strings?

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

59. Which type of join returns all rows from the left table and matching rows from the right?

A. LEFT JOIN B. INNER JOIN C. RIGHT JOIN D. FULL OUTER JOIN

60. What is the purpose of the "Find and Replace" feature?

A. To locate and replace text B. To check spelling C. To insert images D. To change margins

English 10 MCQs

61. What does exercise strengthen according to the passage?

A. The heart B. The lungs C. The liver D. The kidneys

62. What does "moderate" mean?

A. Not extreme B. Very intense C. Very light D. Rare

63. Read the passage: "Friendship is one of the most important relationships in life. Good friends provide emotional support, reduce stress, and increase happiness. They also encourage healthy habits and help us grow as individuals. However, maintaining friendships requires time, effort, and mutual trust." What is the main idea?

A. Friendship is valuable but requires effort to maintain B. Friends are not important C. Friendships are easy to keep D. Friends only bring stress

64. What is the overall tone?

A. Warm and encouraging B. Cold and distant C. Sarcastic D. Indifferent

65. 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

66. What is reduced due to excessive social media use?

A. Face-to-face interactions B. Online interactions C. Screen time D. Global connections

67. What is an example of a kind gesture mentioned?

A. A smile or helping hand B. A gift of money C. A large party D. A long speech

68. What does "ripple effect" mean?

A. The spreading effect of an action B. A small wave C. A negative consequence D. A stopping point

69. What does "restoration" mean?

A. Recovery and renewal B. Destruction C. Ignoring D. Weakening

70. Read the passage: "Traveling exposes people to new cultures, cuisines, and perspectives. It broadens the mind, reduces stress, and creates lasting memories. Whether domestic or international, travel encourages personal growth and helps people appreciate diversity. Even short trips can have a positive impact on mental health." What is the main idea?

A. Travel has positive effects on personal growth and mental well-being B. Travel is only for the wealthy C. Travel is a waste of time D. Travel causes stress

Maths 30 MCQs

71. Solve: |x - 3| = 5

A. 8 and -2 B. 8 and 2 C. -8 and 2 D. 8 and -2

72. What is the value of (2x)° when x=3?

A. 6 B. 8 C. 9 D. 27

73. Simplify: (3x²y)³

A. 27x⁶y³ B. 9x⁶y³ C. 27x⁵y³ D. 9x⁵y³

74. What is the value of sin²θ + cos²θ?

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

75. What is the decimal equivalent of 3/5?

A. 0.6 B. 0.3 C. 0.5 D. 0.75

76. If x% of 200 is 40, then x = ?

A. 20 B. 10 C. 30 D. 40

77. What is the exponential form of log₃ 81 = 4?

A. 3⁴ = 81 B. 81⁴ = 3 C. 4³ = 81 D. 3⁸¹ = 4

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

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

79. What is the derivative of f(x) = 7x?

A. 7 B. 0 C. 7x D. x

80. What is the derivative of f(x) = ln(5x)?

A. 1/x B. 5/x C. 1/(5x) D. ln 5

81. What is ∫ sec x tan x dx?

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

82. What is ∫ cos(3x) dx?

A. 1/3 sin(3x) + C B. sin(3x) + C C. -1/3 sin(3x) + C D. 3 sin(3x) + C

83. What is ∫ (1/x) dx from 1 to e?

A. 1 B. ln e = 1 C. ln e - ln 1 = 1 D. e

84. The power set of A={a,b} has how many elements?

A. 4 B. 2 C. 3 D. 8

85. Which of the following is an irrational number?

A. √4 B. 3/4 C. √2 D. 0.5

86. Which of the following intervals is correct for x ≥ 3?

A. [3,∞) B. (3,∞) C. (-∞,3] D. (-∞,3)

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

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

88. What is the sum of 1+3+5+... up to 10 terms?

A. 100 B. 90 C. 110 D. 80

89. Find the sum of the series 2+4+6+...+20.

A. 110 B. 90 C. 100 D. 120

90. What is the sum of 1^2+2^2+3^2+4^2?

A. 30 B. 20 C. 40 D. 25

91. What is the probability of rolling a 3 on a fair dice?

A. 1/6 B. 1/2 C. 1/3 D. 1

92. Which identity is true for all θ?

A. sin²θ + cos²θ = 1 B. tan²θ + 1 = sec²θ C. 1 + cot²θ = csc²θ D. All of the above

93. What is the value of cos(π/2)?

A. 0 B. 1 C. 1/2 D. √2/2

94. What is the value of tan(π/6)?

A. 1/√3 B. √3 C. 1 D. 0

95. What is the magnitude of vector A = (3,4)?

A. 5 B. 7 C. 1 D. 12

96. What is the unit vector in the direction of (3,4)?

A. (3/5, 4/5) B. (3,4) C. (5/3, 5/4) D. (4/5, 3/5)

97. What is the angle between vectors (1,1) and (1,0)?

A. 45° B. 90° C. 0° D. 60°

98. What is the resultant of A=(2,1) and B=(1,3)?

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

99. What is the cross product of (1,2,0) and (3,4,0)?

A. (0,0,-2) B. (0,0,2) C. (2,0,0) D. (0,2,0)

100. What is the magnitude of 3i + 4j?

A. 5 B. 7 C. 3 D. 4

Physics 30 MCQs

101. The resistance of a conductor depends on all EXCEPT:

A. Applied voltage B. Length C. Cross-sectional area D. Material

102. The magnetic field at the centre of a circular coil carrying current I, radius R, with N turns is:

A. B = μ₀ N I / (2R) B. B = μ₀ I / (2R) C. B = μ₀ N I / R D. B = μ₀ N I / (4πR)

103. The torque on a coil is given by:

A. τ = N I A B sin θ B. τ = N I A B C. τ = N I A B cos θ D. τ = N I A / B

104. The Biot-Savart law gives the magnetic field due to a:

A. Current element B. Point charge C. Magnetic dipole D. Electric dipole

105. The electric field intensity at a point is defined as the force per unit:

A. Positive test charge B. Negative test charge C. Area D. Volume

106. The electric potential at infinity is taken as:

A. Zero B. Infinite C. One D. Undefined

107. Kepler's second law (law of areas) implies that a planet moves faster when:

A. Closer to the Sun B. Farther from the Sun C. At the maximum distance D. At the mean distance

108. The gravitational force between two masses is an example of:

A. Action at a distance B. Contact force C. Tension D. Friction

109. The SI unit of heat energy is:

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

110. The molar specific heat at constant volume C_v is related to C_p by:

A. C_p - C_v = R B. C_v - C_p = R C. C_p + C_v = R D. C_p / C_v = R

111. In a free expansion of an ideal gas into vacuum, the temperature:

A. Remains constant B. Increases C. Decreases D. Becomes zero

112. In a perfectly inelastic collision, the objects:

A. Stick together after collision B. Bounce apart C. Move separately D. Lose all momentum

113. Kinetic energy is given by:

A. K = ½mv² B. K = mv² C. K = ½mv D. K = mgh

114. Power is defined as:

A. Work done per unit time B. Force per unit time C. Energy per unit distance D. Force × velocity

115. The resultant of two equal vectors of magnitude F acting at 90° has magnitude:

A. F√2 B. 2F C. F/√2 D. F

116. The scalar (dot) product of two vectors is:

A. AB cosθ B. AB sinθ C. AB D. A/B

117. Which instrument is used to measure length accurately up to 0.01 mm?

A. Micrometer screw gauge B. Vernier calipers C. Meter rule D. Measuring tape

118. The least count of a Vernier calipers is typically:

A. 0.01 cm B. 0.001 cm C. 0.1 cm D. 0.01 mm

119. The energy of a photon is given by:

A. E = hf B. E = h/f C. E = hλ D. E = c/λ

120. Planck's constant has the value:

A. 6.63 × 10⁻³⁴ Js B. 6.63 × 10⁻³⁴ eV s C. 6.63 × 10⁻³⁴ J/Hz D. All of the above

121. The photoelectric effect proves the:

A. Particle nature of light B. Wave nature of light C. Both D. Neither

122. The angular magnification of a simple microscope (magnifying glass) is:

A. D/f (where D is near point distance) B. f/D C. 1/f D. D/f + 1

123. The centripetal force is given by:

A. F_c = m v²/r B. F_c = m ω²r C. Both A and B D. F_c = m 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. The angular momentum L of a rotating rigid body is given by:

A. L = I ω B. L = m v C. L = I α D. L = r × F

126. The angular acceleration is related to the tangential acceleration a_t by:

A. a_t = α r B. a_t = α/r C. a_t = r/α D. a_t = α r²

127. The maximum displacement of a particle from its equilibrium position is called:

A. Amplitude B. Wavelength C. Frequency D. Period

128. The gravitational potential energy near Earth's surface is given by:

A. U = mgh B. U = ½ mgh C. U = mg/h D. U = gh

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

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

130. If the mass of a body is doubled and speed is halved, the kinetic energy becomes:

A. Half the original B. Same C. Double D. One quarter

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