NCERT Solutions Class 10 Science Chapter 14 Sources of Energy
Question : What is a good source of energy? Answer: A good source of energy fulfils the following criteria: (I)It produces a lot of heat per unit mass. (II) It does a huge amount of work per unit mass. (III) It is easily accessible. (IV) It is easy to store and transport…
NCERT Solutions Class 10 Science Chapter 5 Periodic Classification of Elements
Question : Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out. Answer: Only one triad of Dobereiner’s triads exists in the columns of Newlands’ octaves. The triad formed by the elements Li, Na, and K of Dobereiner’s…
NCERT Solutions Class 10 Science Chapter 15 Our Environment
Question : What would be the electron dot structure of carbon dioxide which has the formula CO2? Answer: Electron dot structure of CO2 is Question : What would be the electron dot structure of a molecule of sulphur which is made up of eight atoms of…
NCERT Solutions Class 10 Science Chapter 3 Metals and Non metals
Question : Explain the meanings of malleable and ductile. Answer: Malleable: Substances that can be beaten into thin sheets are called malleable. For example, most of the metals are malleable. Ductile: Substances that can be drawn into thin wires are called ductile.…
NCERT Solutions Class 10 Science Chapter 16 Management of Natural Resources
Question : What changes can you make in your habits to become more environment-friendly? Answer: We should switch off the electrical appliances when not in use. Water and food should not be wasted. Close the tap when not in use. Dump the objects made of plastic and glass…
NCERT Solutions Class 10 Science Chapter 13 Magnetic Effects of Electric current
Question : Why does a compass needle get deflected when brought near a bar magnet? Answer: A compass needle is a small bar magnet. When it is brought near a bar magnet, its magnetic field lines interact with that of the bar magnet. Hence, a compass needle shows a…
NCERT Solutions Class 10 Science Chapter 10 Light Reflection and Refraction
Question : Define the principal focus of a concave mirror. Answer: Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the principal focus of the…
NCERT Solutions Class 10 Science Chapter 6 Life Processes
Question : Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans? Answer: Multicellular organisms such as humans possess complex body designs. They have specialised cells and tissues for performing various…
NCERT Solutions Class 10 Science Chapter 11 Human Eye and Colourful World
Question : What is meant by power of accommodation of the eye? Answer: When the ciliary muscles are relaxed, the eye lens becomes thin, the focal length increases, and the distant objects are clearly visible to the eyes. To see the nearby objects clearly, the ciliary…
NCERT Solutions Class 10 Science Chapter 8 How do Organisms Reproduce
Question : What is the importance of DNA copying in reproduction? Answer: DNA (Deoxyribonucleic acid) is the genetic material found in the chromosomes, which are present in the nucleus of a cell. The DNA is the information site for making proteins and each specific type…
NCERT Solutions Class 10 Science Chapter 9 Heredity and Evolution
Question : If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier? Answer: In asexual reproduction, the reproducing cells produce a copy of…
NCERT Solutions Class 10 Science Chapter 12 Electricity
Question : What does an electric circuit mean? Answer: An electric circuit consists of electric devices, switching devices, source of electricity, etc. that are connected by conducting wires. Question : Define the unit of current. Answer: The unit of electric…
NCERT Solutions Class 10 Science Chapter 7 Control and Coordination
Question : What is the difference between a reflex action and walking? Answer: A reflex action is a rapid, automatic response to a stimulus. It does not involve any thinking. For example, we close our eyes immediately when the bright light is focused. …
NCERT Solutions Class 10 Science Chapter 4 Carbon and its Compounds
Question. Which of the following is not an use of graphite ? (A) dry lubricant (B) electrodes (C) black paints (D) high precision thermometers Answer : D Question. Which of the following is the chemically inactive allotropic form of carbon ? (A) diamond (B) coal (C) charcoal…