Agniveer CEE 2026 — General Science
20 free Science MCQs · Physics, Chemistry, Biology — Class 10 NCERT level
Physics
Motion, Force, Light, Sound, Electricity, Magnetism, Simple Machines
Chemistry
Acids & Bases, Metals & Non-metals, Carbon, Chemical Reactions, Periodic Table
Biology
Cell, Human Body Systems, Nutrition, Diseases & Prevention, Vitamins, Ecology
Showing 20 questions · Correct answer highlighted
Which of the following statements correctly describes the role of the placenta during human pregnancy?
Explanation: The placenta is a temporary organ that develops in the uterus during pregnancy. Its primary functions are to facilitate the exchange of nutrients, oxygen, and waste products between the mother's blood and the fetal blood, and to provide hormonal support for pregnancy maintenance. The placenta does N…
A man pushes a box horizontally across a frictionless floor with a force of 50 N. The box moves a distance of 8 m in the direction of the applied force. How much work is done on the box?
Explanation: Work is defined as the product of force and displacement in the direction of the force. Using the formula W = F × s × cos(θ), where θ is the angle between force and displacement. Since the force is applied horizontally and the box moves horizontally, θ = 0°, so cos(0°) = 1. Therefore, W = 50 N × 8 m…
Which of the following is a functional group present in ethanol (C₂H₅OH)?
Explanation: Ethanol has the molecular formula C₂H₅OH. The -OH group attached to a carbon atom is called a hydroxyl group or alcohol functional group. This is the defining characteristic of alcohols in organic chemistry. According to NCERT Class 10, alcohols contain the -OH functional group bonded to a saturated…
During photosynthesis in green plants, which of the following is the primary function of chlorophyll?
Explanation: Chlorophyll is the green pigment present in chloroplasts that absorbs light energy from the sun. According to NCERT Class 10 Biology, chlorophyll's primary role is to capture light energy (photons) during the light-dependent reactions of photosynthesis. This absorbed light energy is then converted i…
Which of the following blood vessels carries oxygenated blood from the lungs to the heart?
Explanation: The pulmonary veins are the only veins in the human body that carry oxygenated blood. After gas exchange occurs in the lungs, oxygenated blood returns to the left atrium of the heart via four pulmonary veins (two from each lung). This is a fundamental concept in the circulatory system taught in NCER…
Copper is extracted from its ore by reduction with carbon monoxide in a blast furnace. Which of the following best describes why copper cannot be extracted by direct reduction with carbon at high temperature in the same way as iron?
Explanation: Copper is less reactive than carbon in the reactivity series of metals. According to the NCERT Class 10 Chemistry principle, a metal can only be displaced from its ore by a reducing agent (non-metal or another metal) that is more reactive than the metal itself. Since carbon is more reactive than cop…
When a few drops of phenolphthalein indicator are added to a solution, the solution turns pink. What can be concluded about the nature of the solution?
Explanation: Phenolphthalein is a pH indicator that remains colourless in acidic and neutral solutions (pH < 8.3) but turns pink/magenta in basic solutions (pH ≥ 8.3). Since the solution turned pink upon addition of phenolphthalein, the solution must be basic in nature. This is a standard NCERT Class 10 indicato…
When zinc metal reacts with dilute sulfuric acid, hydrogen gas is produced. Which type of chemical reaction is this?
Explanation: This reaction is a displacement reaction (also called single displacement). Zinc is more reactive than hydrogen and displaces hydrogen from the acid. The balanced equation is: Zn(s) + H₂SO₄(aq) → ZnSO₄(aq) + H₂(g). In a displacement reaction, a more reactive element replaces a less reactive element …
An atom of an element has 8 protons and 8 neutrons. What is its mass number?
Explanation: The mass number (A) is the sum of the number of protons (Z) and neutrons (N) in the nucleus of an atom. This is a fundamental concept in atomic structure taught in NCERT Class 9. Given: Protons (Z) = 8, Neutrons (N) = 8. Therefore, Mass number (A) = Z + N = 8 + 8 = 16. The element with 8 protons is …
Which of the following elements is located in Period 3, Group 13 of the periodic table?
Explanation: The periodic table is organized by periods (horizontal rows) and groups (vertical columns). Period 3 contains elements with 3 electron shells (atomic numbers 11–18). Group 13 (or IIIA in older notation) contains elements with 3 valence electrons in their outermost shell. The element at the intersect…
In a monohybrid cross between a homozygous dominant plant (TT) and a homozygous recessive plant (tt), what will be the genotypic ratio of the F₁ generation?
Explanation: This question tests understanding of Mendel's Law of Segregation and basic Punnett square analysis. When a homozygous dominant parent (TT) is crossed with a homozygous recessive parent (tt), all gametes from TT are T and all gametes from tt are t. The F₁ generation receives one T allele from each pa…
A car accelerates uniformly from rest and reaches a velocity of 20 m/s in 5 seconds. What is the acceleration of the car?
Explanation: This question tests the first equation of motion: v = u + at. Here, initial velocity (u) = 0 m/s (starts from rest), final velocity (v) = 20 m/s, and time (t) = 5 s. Rearranging: a = (v − u) / t = (20 − 0) / 5 = 4 m/s². This is a direct application of Newton's second law in kinematic form. Therefore…
Which of the following is the primary function of mitochondria in animal cells?
Explanation: Mitochondria are membrane-bound organelles responsible for aerobic respiration and ATP (adenosine triphosphate) production. During cellular respiration, glucose and other nutrients are oxidized to release energy, which is captured in the form of ATP molecules. This ATP serves as the universal energy…
In an ecosystem, plants are eaten by herbivores, which are then eaten by carnivores. What percentage of energy from plants is typically available to the carnivores in this food chain?
Explanation: This question tests understanding of the 10% Law (or Law of Energy Transfer) in ecosystems, a core NCERT Class 10 concept. According to this principle, only approximately 10% of energy is transferred from one trophic level to the next; the remaining 90% is lost through respiration, heat, and other m…
A concave mirror has a focal length of 15 cm. An object is placed at a distance of 30 cm from the mirror. What is the nature of the image formed?
Explanation: This question tests the application of the mirror formula and understanding of image formation in concave mirrors. The mirror formula is 1/f = 1/u + 1/v, where f is focal length, u is object distance, and v is image distance. Given: f = 15 cm (concave, so positive), u = 30 cm (object distance, posit…
A thermometer shows a reading of 30°C. What is this temperature in Kelvin (K)?
Explanation: Temperature conversion from Celsius to Kelvin uses the formula: T(K) = T(°C) + 273.15. For practical purposes in Class 10 NCERT, this is rounded to T(K) = T(°C) + 273. Therefore, 30°C = 30 + 273 = 303 K. Option B is correct.
A wire of resistance 5 Ω is connected to a 10 V battery. What is the current flowing through the wire?
Explanation: This question tests Ohm's Law (V = IR), a fundamental principle in Class 9–10 electricity. Using Ohm's Law: I = V ÷ R = 10 V ÷ 5 Ω = 2 A. Therefore, the answer is B.
A concave mirror has a focal length of 15 cm. An object is placed at a distance of 30 cm from the mirror. What is the nature and position of the image formed?
Explanation: This question tests the application of the mirror formula and understanding of image formation in concave mirrors. Using the mirror formula: 1/f = 1/u + 1/v, where f = focal length, u = object distance, v = image distance. Given: f = 15 cm (concave, so positive), u = 30 cm (object distance, positive…
A concave mirror has a focal length of 15 cm. An object is placed 30 cm in front of it. What is the nature of the image formed?
Explanation: Using the mirror formula: 1/v + 1/u = 1/f. With u = -30 cm and f = -15 cm, we get 1/v = 1/f - 1/u = -1/15 + 1/30 = -1/30, so v = -30 cm. Since v is negative (same side as object), the image is real and inverted. As |v| = |u|, the image is the same size as the object. This occurs when the object is p…
A movable pulley system is used to lift a load of 1200 N. If the effort applied is 400 N, what is the mechanical advantage of this pulley system?
Explanation: Mechanical Advantage (MA) is defined as the ratio of Load to Effort. MA = Load ÷ Effort = 1200 N ÷ 400 N = 3. A movable pulley typically provides an MA of 2 or more because the load is supported by multiple segments of the rope. In this case, the MA of 3 indicates a system with three supporting rope…
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