Q226. Limbs of frog, lizard, bird and human are example of ______ organs.
(a) Homogenous
(b) Heterogeneous
(c) Analogous
(d) Homologous
Answer
Ans.(d)
Sol. A homologous structure is an organ, system, or body part that shares a common ancestry in multiple organisms. Limbs of frog, lizard, bird and human are example of Homologous organs.
Q227. Pepsin is an enzyme that digests ______.
(a) Proteins
(b) Starch
(c) Carbohydrate
(d) Fats
Answer
Ans.(a)
Sol. Pepsin is an endopeptidase that breaks down proteins into smaller peptides (protease). It is produced in the stomach and is one of the main digestive enzymes in the digestive systems of humans and many other animals, where it helps digest the proteins in food.
Q228. Any body kept in a fluid experiences an upward force called ______.
(a) Torque
(b) Moment
(c) Pressure
(d) Upthrust
Answer
Ans.(d)
Sol. The upward force exerted by the water on the bottle is known as upthrust or buoyant force. In fact, all objects experience a force of buoyancy when they are immersed in a fluid.
Q229. As an object falls freely its ___.
(a) Kinetic energy gets converted into potential energy
(b) Potential energy gets converted into kinetic energy
(c) Momentum gets converted into gravitational force
(d) Gravitational force gets converted into momentum
Answer
Ans.(b)
Sol. Before the object begins falling, it has gravitational potential energy which can be calculated by mgh, So the initial potential energy will equal the kinetic energy of the object right before it hits the ground. The potential energy has been converted into kinetic energy.
Q230. Which of the following statement is INCORRECT regarding Sodium?
(a) Sodium reacts vigorously with oxygen and water
(b) A lot of heat is generated when sodium reacts with water and oxygen
(c) It is stored in kerosene
(d) It is a non-metal
Answer
Ans.(d)
Sol. Sodium is an alkali metal. It reacts quickly with water and oxygen and produces a lot of heat when it reacts with water and oxygen. So, it is kept in kerosene oil.
Q231.In which part of the human body fat is completely digested?
(a) Small Intestine
(b) Lever
(c) Stomach
(d) Large Intestine
Answer
Ans.(a)
Sol. Digestion of some fats can begin in the mouth where lingual lipase breaks down some short chain lipids into diglycerides. However fats are mainly digested in the small intestine.
Q232.Which of the following statement(s) is/are INCORRECT regarding Phosphorus?
(a) Phosphorus reacts vigorously with water.
(b) It is a non-metal.
(c) It catches fire on reacting with air.
(d) It is found in group 15 of the modern periodic table.
Answer
Ans.(a)
Sol. Phosphorus (P) is a nonmetallic chemical element of the nitrogen family (Group 15 of the periodic table) that at room temperature is a colorless, semitransparent, soft, waxy solid that glows in the dark. Phosphorus can be stored under water. It catches fire on reacting with air.
Q233.The transport of soluble products of photosynthesis is called ______.
(a) transpiration
(b) translocation
(c) transportation
(d) concentration
Answer
Ans.(b)
Sol. The transport of soluble products of photosynthesis is called translocation and it occurs in the part of the vascular tissue.
Q234.Which feature of the cell allows or permits the entry and exit of some materials in and out of the cell?
(a) Cytoplasm
(b) Protoplasm
(c) Cell wall
(d) Plasma membrane
Answer
Ans.(d)
Sol. Plasma membrane allows or permits the entry and exit of some materials in and out of the cell.
Q235.The skin, the lining of the mouth, the lining of the blood vessels, lung alveoli and kidney tubules are all made of which type of tissue?
(a) Epithelial tissue
(b) Connective tissue
(c) Muscular tissue
(d) Nervous tissue
Answer
Ans.(a)
Sol. The skin, the lining of the mouth, the lining of blood vessels, lung alveoli and kidney tubules are all made of epithelial tissue. Epithelial tissue cells are tightly packed and form a continuous sheet.
Q236. An object at rest will remain at rest and an object in motion will remain in motion until and unless it is acted upon by an external force. This is Newton's
(a) First law
(b) Second law
(c) Third law
(d) Fourth law
Answer
Ans.(a)
Sol. Newton's First Law of Motion states that a body at rest will remain at rest unless an outside force acts on it, and a body in motion at a constant velocity will remain in motion in a straight line unless acted upon by an outside force.
Q237. What will happen if an object is dropped from a height and there is no air resistance?
(a) It will fall with a constant speed and acceleration
(b) Its acceleration will increase
(c) Both speed and acceleration will increase
(d) Its speed will increase
Answer
Ans.(d)
Sol. When an Object is dropped from height and when there is no air resistance the speed of object will increase.
Q238. The reflection formed by the plane mirror is _____.
(a) Vertical inversion
(b) A real image
(c) Lateral inversion
(d) An Enlarged image
Answer
Ans.(c)
Sol. The reflection formed by the plane mirror is Lateral inversion.
Q239. In nuclear reactor, cadmium rods are used as which of the following?
(a) Fuel
(b) Moderator
(c) Controller
(d) Lubricant
Answer
Ans.(c)
Sol. Control rods are used in nuclear reactors to control the fission rate of uranium and plutonium. They are composed of chemical elements such as boron, silver, indium and cadmium that are capable of absorbing many neutrons without themselves fissioning.
Q240. Which of the following is used in gunpowder?
(a) Potassium bromide
(b) Potassium nitrate
(c) Monopotassium tartarate
(d) Potassium sulphate
Answer
Ans.(b)
Sol. Gunpowder, also known as black powder to distinguish it from modern smokeless powder, is the earliest known chemical explosive. It consists of a mixture of sulfur (S), charcoal (C), and potassium nitrate (saltpeter, KNO3). The sulfur and charcoal act as fuels while the saltpeter is an oxidizer.
Q241.Isobars are atoms of different chemical elements that have ______.
(a) Same atomic number but different mass number
(b) Same mass number but different atomic number
(c) Same mass number and same atomic number
(d) Different mass number and different atomic number
Answer
Ans.(b)
Sol. Atoms of chemical elements having same atomic mass but a different atomic number are called Isobars.
Q242. Which type of pathogen causes the water-borne disease Dysentery?
(a) Algal
(b) Parasitic
(c) Protozoan
(d) Bacterial
Answer
Ans.(d)
Sol. Bacteria are one type of microorganism that can cause disease and can be found virtually everywhere, including in the soil and water. In general, the most common symptoms from a bacterial infection are diarrhea, which may be bloody, and fever.
Q243. The process in which the organism can be cut into any number of pieces and each piece grows into a complete organism is called ______.
(a) Regeneration
(b) Budding
(c) Spore formation
(d) No option is correct
Answer
Ans.(a)
Sol. The process in which the organism can be cut into any number of pieces and each piece grows into a complete organism is called Regeneration.
Q244. Which meristem increases the length of the stems and the roots?
(a) Apical meristem
(b) Lateral meristem
(c) Intercalary meristem
(d) Nodal meristem
Answer
Ans.(a)
Sol. The apical meristem is the growth region in plants found within the root tips and the tips of the new shoots and leaves. Apical meristem is one of three types of meristem, or tissue which can differentiate into different cell types. Meristem is the tissue in which growth occurs in plants.
Q245. The unit of which physical quantity is not pascal?
(a) Moment of inertia
(b) Pressure
(c) Stress
(d) Young's modulus
Answer
Ans.(a)
Sol. Pascal is not unit of Moment of Inertia. Moment of inertia may be expressed in units of kilogram metre squared (kg. m2) in SI units.
Q246. Atmospheric pressure is measured by _____.
(a) Barometer
(b) Hexameter
(c) Nanometer
(d) Glaxometer
Answer
Ans.(a)
Sol. Atmospheric pressure is measured by a Barometer
Q247.Who invented the electrocardiogram (ECG)?
(a) Willem Einthoven
(b) Edward Jenner
(c) Antonio de Ulloa and Charles Wood
(d) Karl Benz
Answer
Ans.(a)
Sol. Willem Einthoven invented the electrocardiogram (ECG).
Q248. The primary function of RNA is -
(a) Photosynthesis
(b) Protein Synthesis
(c) Replication
(d) Translation
Answer
Ans.(b)
Sol. The main function of RNA is to carry information of amino acid sequence from the genes to where proteins are assembled on ribosomes in the cytoplasm. This is done by messenger RNA (mRNA). In other words, primary function of RNA is protein synthesis.
Q249. ______ is the movement of molecules across a cell membrane from a region of their lower concentration to a region of their higher concentration.
(a) Diffusion
(b) Osmosis
(c) Active Transport
(d) Passive Transport
Answer
Ans.(c)
Sol. Active transport is the movement of dissolved solutes across a membrane against a concentration gradient (moving from low to high concentration). This process requires a carrier protein, and energy in the form of ATP is required.
Q250. Which of the following bonds are weakest in nature?
(a) Single bond
(b) Double bond
(c) Triple bond
(d) Hydrogen bond
Answer
Ans.(d)
Sol. Hydrogen Bond is weakest bond between atoms. Occur in molecules that have covelent bonds. Sometimes the electrons are not equally shared; one atom tends to have an electron more often than the other atom. In this situation one atom of the molecule becomes partly negative and the other then becomes partly positive. This is especially common between water molecules.
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