1) Which subatomic particle has a negative charge? a) Proton b) Nucleus c) Neutron d) Electron 2) The atomic model that introduces the concept of atomic shells in which electrons move is... a) Dalton b) Rutherford c) Thomson d) Bohr 3) Which of the following pairs are isotopes? a) ³⁵Cl and ³⁵Ar b) ¹⁶O and ¹⁸O c) ¹H and ²He d) ¹²C and ¹⁴N 4) Which statement is true about isotopes? a) They have different atomic numbers b) They have the same number of protons, different number of neutrons c) They have different numbers of electrons d) D.They have the same number of neutrons 5) An atom has 6 protons and 8 neutrons. What is its mass number? a) 12 b) 6 c) 14 d) 8 6) Which of the following is an SI base unit? a) Ampere b) Coulomb c) Newton d) Joule 7) The ion has a charge of –1, has 18 electrons, and a mass number of 35. Which element is it? a) Chlorine b) Argon c) Sulfur d) Potassium 8) What is the relative formula mass of Ethanoic Acid, C₂H₄O₂? a) 62 b) 60 c) 58 d) 64 e) 0.8 9) The marks of stuudents are: 70, 65, 60, 75, 80, 90, 95, 75, 85, 90. Find the mean score... a) 78.5 b) 80 c) 79 d) 79.5 10) The following are the marks of 5 students in a test: 60, 80, 85, 70, 100. a) 78.5m b) 80 c) 79 d) 79.5 11) Determine the base units of density. (density=mass/volume) a) kgs-1 b) kgm-3 c) ms-2 d) ms-1 e) kgm-2 12) Find the roots of the quadratic equation: x² - 5x + 6 = 0 a) x = 2, 3 b) x = 1, 6 c) x = -2, -3 d) x = 5, 6 13) Solve for x: x² - 8x + 15 = 0 a) x = 3, 5 b) x = 2, 6 c) x = 1, 15 d) x = 5, 8 14) Find the roots: x² - 9x + 20 = 0 a) x = 4, 5 b) x = 2, 10 c) x = -4, -5 d) x = 1, 20 15) Solve: x² - 4x - 5 = 0 a) x = 5, -1 b) x = 4, -5 c) x = 1, -5 d) x = 5, -4 16) Solve for x: 2x² - 7x + 3 = 0 a) x = 3, 1/2 b) x = 7, -3 c) x = 3/2, 2 d) x = 1, 3 17) Find the roots of: 3x² - 12x + 9 = 0 a) x = 1, 3 b) x = 3/2, 3 c) x = 9, -3 d) x = 2, 3/2 18) A quadratic equation has roots x₁ and x₂. If x₁ + x₂ = 7 and x₁·x₂ = 12, which quadratic equation is correct? a) x² - 7x + 12 = 0 b) x² + 7x + 12 = 0 c) x² - 12x + 7 = 0 d) x² + 12x - 7 = 0 19) A quadratic equation is given by: x² - (k+1)x + k = 0. If one root is x = 2, find the other root. a) x = 3 b) x = 4 c) x = 1 d) x = -2 20) The roots of a quadratic equation differ by 5. If the sum of the roots is 9, which quadratic equation is correct? a) x² - 9x + 10 = 0 b) x² - 9x + 14 = 0 c) x² - 9x + 20 = 0 d) x² - 9x + 12 = 0 21) A quadratic equation has roots x₁ and x₂. If x₁² + x₂² = 58 and x₁ + x₂ = 10, what is the quadratic equation? a) x² - 10x + 21 = 0 b) x² - 10x + 29 = 0 c) x² - 29x + 10 = 0 d) x² - 21x + 10 = 0 22) Which of the following is a vector quantity? a) Speed b) Distance c) Displacement d) Mass 23) The SI unit of acceleration is: a) m/s b) m/s² c) km/h d) N/kg 24) A square has an area of . Find the length of its side a) 15 cm b) 13 cm c) 14 cm d) 13.5 cm 25) A ladder is placed against a wall. The ladder is 13 m long, and its foot is 5 m away from the wall. How high does the ladder reach on the wall? a) 12 m b) 14 cm c) 13 m d) 15 cm 26) Which of the following is NOT a base quantity in SI? a) Length b) Time c) Mass d) Force 27) The displacement-time graph of a moving car is a curve bending upward. Which statement is correct? a) The car moves with constant velocity b) The car moves with increasing velocity c) The car moves with decreasing velocity d) The car is at rest 28) Two objects A and B are released from the same height. A is dropped freely, B is thrown downward with 5 m/s. Which reaches the ground first? a) A b) B c) Both at the same time d) Cannot be determined 29) A body moves such that its acceleration decreases with time but is never zero. Which graph best represents velocity-time relation? a) Straight line through origin b) Upward curve with increasing slope c) Upward curve with decreasing slope d) Horizontal straight line 30) The velocity of a particle is given by v = 6 – 2t (m/s). At what time will the particle momentarily stop? a) 1 s b) 2 s c) 3 s d) 6 s 31) A train moves with speed 20 m/s. The driver sees an obstacle 200 m ahead and applies brakes, producing uniform deceleration of 2 m/s². Will the train stop before hitting the obstacle? a) Yes, it stops 20 m before b) Yes, it stops exactly at the obstacle c) No, it will pass 10 m beyond d) No, it will pass 20 m beyond 32) Which of the following is true about bacteria? a) They are eukaryotic organisms b) They have no nucleus c) They contain membrane-bound organelles d) They reproduce only sexually 33) Which structure is present in viruses but absent in bacteria? a) Ribosome b) Cell wall c) Protein coat (capsid) d) Cytoplasm 34) Bacteria reproduce asexually through: a) Budding b) Binary fission c) Conjugation d) Fragmentation 35) Which disease is caused by bacteria? a) Influenza b) Tuberculosis c) COVID-19 d) Dengue fever 36) Which of the following is NOT a characteristic of viruses? a) They are obligate intracellular parasites b) They have genetic material either DNA or RNA c) They can reproduce independently outside a host d) They are smaller than bacteria 37) Why are antibiotics ineffective against viruses? a) Viruses have no cell wall b) Viruses are resistant to all chemicals c) Viruses are larger than bacteria d) Viruses do not contain DNA or RNA 38) The circular DNA found in bacteria that can replicate independently is called: a) Nucleus b) Plasmid c) Chromosome d) Ribosome 39) A particle moves in a straight line with displacement s = 10t – 2t² (s in m, t in s). At what time does the particle come to rest? a) 2.5 s b) 5 s c) 10 s d) 20 s 40) Choose the odd one out: a) Circle b) Triangle c) Square d) Cube 41) If 5 workers can build a wall in 12 days, how many workers are needed to build it in 4 days? a) 10 b) 12 c) 15 d) 20 42) Three pens cost as much as two pencils. One pencil costs $6. How much is one pen? a) $4 b) $6 c) $9 d) $12 43) If the day before yesterday was Wednesday, what day will it be two days from now? a) Friday b) Saturday c) Sunday d) Monday 44) Find the next number in the sequence: 2, 6, 12, 20,..... ? a) 28 b) 30 c) 32 d) 34 45) If all roses are flowers, and some flowers fade quickly, which statement must be true? a) All roses fade quickly b) Some roses fade quickly c) Some flowers that fade quickly are not roses d) All flowers are roses 46) Which of the following compounds is held together by ionic bonds? a) H₂O b) NaCl c) CH₄ d) O₂ 47) Covalent bonds are formed by: a) Transfer of electrons b) Sharing of electrons c) Attraction between ions d) Movement of protons 48) Which of the following molecules has a double covalent bond? a) H₂ b) Cl₂ c) O₂ d) NaCl 49) Which of the following is a polar covalent molecule? a) CO₂ b) HCl c) N₂ d) CH₄ 50) In metallic bonding, the positive ions are surrounded by: a) Fixed electrons b) Shared electron pairs c) Delocalized electrons d) Protons only

Ladders War

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