Practice free NEET NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
What was a significant application of the H$_{2}$-O$_{2}$ fuel cell mentioned in the context?
The NCERT text highlights, 'One of the most successful fuel cells uses the reaction of hydrogen with oxygen to form water (Fig. 2.12). The cell was used for providing electrical power in the Apollo space programme.'
What happens to the water produced in the H$_{2}$-O$_{2}$ fuel cell used in the Apollo space programme?
The NCERT text states: 'The water vapours produced during the reaction were condensed and added to the drinking water supply for the astronauts.'
What catalysts are typically incorporated into the electrodes of a H$_{2}$-O$_{2}$ fuel cell to increase the rate of reactions?
The NCERT text mentions: 'Catalysts like finely divided platinum or palladium metal are incorporated into the electrodes for increasing the rate of electrode reactions' in a fuel cell.
What is the overall reaction for the H$_{2}$-O$_{2}$ fuel cell?
The NCERT text explicitly states the 'Overall reaction being: 2H$_{2}$(g) + O$_{2}$(g) $\rightarrow$ 2H$_{2}$O(l)' for the fuel cell using H$_{2}$ and O$_{2}$.
Which of the following is a characteristic of a primary battery?
The NCERT text defines primary batteries: 'In the primary batteries, the reaction occurs only once and after use over a period of time battery becomes dead and cannot be reused again.'
In a dry cell, what materials constitute the anode and cathode?
The NCERT text states for the dry cell: 'The cell consists of a zinc container that also acts as anode and the cathode is a carbon (graphite) rod surrounded by powdered manganese dioxide and carbon.'
What is the main reason why fuel cells are considered highly efficient compared to thermal power plants for electricity production?
The NCERT text explains: 'Production of electricity by thermal plants is not a very efficient method and is a major source of pollution. In such plants, the chemical energy (heat of combustion) of fossil fuels... is first used for converting water into high pressure steam... This is then used to run a turbine to produce electricity. We know that a galvanic cell directly converts chemical energy into electricity and is highly efficient.' This direct conversion minimizes energy losses.
Which of the following describes the ploidy of cells produced by mitosis in animal somatic cells?
According to the NCERT text, 'In animals, mitotic cell division is only seen in the diploid somatic cells.' This implies that the resulting daughter cells will also be diploid, maintaining the chromosome number. Therefore, mitosis in animal somatic cells always produces diploid cells.
Mitosis is essential for restoring the nucleo-cytoplasmic ratio. Why does this ratio become disturbed during cell growth?
The NCERT states, 'Cell growth results in disturbing the ratio between the nucleus and the cytoplasm. It therefore becomes essential for the cell to divide to restore the nucleo-cytoplasmic ratio.' This disturbance occurs because cell growth (in terms of cytoplasmic increase) is a continuous process, leading to a larger cytoplasmic volume relative to the nucleus. Mitosis then divides the cell, restoring the optimal ratio.
Which of the following is a key characteristic of cells in the quiescent stage ($G_0$) of the cell cycle?
The context mentions, 'These cells that do not divide further exit $G_1$ phase to enter an inactive stage called quiescent stage ($G_0$) of the cell cycle. Cells in this stage remain metabolically active but no longer proliferate unless called on to do so depending on the requirement of the organism.'
Ready to ace NEET?
Free access · No credit card required
Yes. You can attempt every NEET question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.
No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.
The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.