Newton’s First Law — Inertia 1. A passenger in a moving bus falls forward when the bus suddenly stops. This is due to: (A) Inertia of rest(B) Inertia of motion(C) Centripetal force(D) Gravitational force Answer: (B) Inertia of motionExplanation: The passenger’s body tends to continue moving forward even after the bus stops. 2. When a … Read more

1. In a hydroelectric power plant, the energy of stored water is first converted mainly into: (A) Nuclear energy(B) Kinetic energy(C) Chemical energy(D) Sound energyAnswer: (B) Kinetic energyExplanation: Water stored at a height has gravitational potential energy. As it falls, this is converted into kinetic energy, which ultimately helps generate electrical energy. 2. The ultimate … Read more

Below is a competitive-exam focused MCQ set based directly on the applications you listed, with emphasis on the type of “device/phenomenon → principle” questions commonly asked in General Science. 1. Sea breeze generally occurs during the day because: (A) Sea heats faster than land(B) Land heats faster than sea(C) Both land and sea heat equally(D) … Read more

1. A sharp knife cuts vegetables more easily than a blunt knife because a sharp knife: (A) Applies less force(B) Has a smaller contact area and produces greater pressure(C) Has greater mass(D) Produces less pressure Answer: (B) Has a smaller contact area and produces greater pressureExplanation: Pressure is force per unit area. For the same … Read more

Below is a competitive-exam focused set on Sound, emphasizing everyday applications such as echo, SONAR, ultrasound, echolocation, noise control, megaphones, stethoscopes and Doppler effect. 1. An echo is produced mainly due to: (A) Refraction of sound(B) Reflection of sound(C) Absorption of sound(D) Diffraction of sound Answer: (B) Reflection of soundExplanation: An echo is the repetition … Read more

1. The angle of incidence is equal to the angle of reflection when light is reflected from a plane mirror. This is known as: (A) Law of refraction(B) Law of reflection(C) Law of dispersion(D) Law of diffractionAnswer: (B) Law of reflectionExplanation: According to the law of reflection, the angle of incidence equals the angle of … Read more

Five-Kingdom Classification 1. The five-kingdom classification was proposed by: (A) Carl Linnaeus(B) R.H. Whittaker(C) Charles Darwin(D) Gregor MendelAnswer: (B) R.H. Whittaker 2. Which of the following is not one of the five kingdoms? (A) Monera(B) Protista(C) Fungi(D) ArchaeaAnswer: (D) Archaea 3. Bacteria are generally placed in the kingdom: (A) Protista(B) Monera(C) Fungi(D) PlantaeAnswer: (B) Monera … Read more

1. Genetic engineering involves: (A) Natural selection of organisms(B) Direct manipulation of an organism’s genetic material(C) Only the study of fossils(D) Production of energy from foodAnswer: (B) Direct manipulation of an organism’s genetic material 2. Which molecule is usually manipulated in genetic engineering to introduce a desired trait? (A) DNA(B) Lipid(C) Starch(D) WaterAnswer: (A) DNA … Read more

Natural Selection & Darwin’s Theory 1. Who is most closely associated with the theory of evolution by natural selection? (A) Gregor Mendel(B) Charles Darwin(C) Louis Pasteur(D) Robert HookeAnswer: (B) Charles Darwin 2. Darwin proposed that organisms evolve primarily through: (A) Natural selection(B) Photosynthesis(C) Artificial fertilization(D) Binary fissionAnswer: (A) Natural selection 3. Natural selection occurs because: … Read more

Ecosystem 1. An ecosystem consists of: (A) Only living organisms(B) Only non-living components(C) Living organisms and their physical environment(D) Only plants and animalsAnswer: (C) Living organisms and their physical environmentExplanation: An ecosystem includes biotic components and abiotic factors such as water, soil, air, light and temperature. 2. Which of the following is an abiotic component … Read more