Practice free Physics NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Convection primarily occurs in which states of matter?
The NCERT text specifies, 'It is possible only in fluids.' Fluids include both liquids and gases because their particles are free to move and can undergo bulk transport required for convection.
Which of the following is an example of natural convection?
The NCERT text states, 'Natural convection is responsible for many familiar phenomena... creating a sea breeze near a large body of water.' The other options are explicitly mentioned as examples of forced convection.
In natural convection, when a fluid is heated from below, why does the heated part rise?
The NCERT text explains, 'When a fluid is heated from below, the hot part expands and, therefore, becomes less dense. Because of buoyancy, it rises and the upper colder part replaces it.'
Which of the following processes primarily involves forced convection?
The NCERT text explicitly states, 'In the human body, the heart acts as the pump that circulates blood through different parts of the body, transferring heat by forced convection and maintaining it at a uniform temperature.'
What role does gravity play in natural convection?
The NCERT text says, 'In natural convection, gravity plays an important part.' This is because density differences due to heating lead to buoyant forces, and gravity acts on these density differences, causing the less dense (hotter) fluid to rise and denser (colder) fluid to sink.
Convection involves what type of heat transport?
The NCERT text clarifies, 'Convection involves bulk transport of different parts of the fluid.' This contrasts with conduction (molecular collisions) and radiation (electromagnetic waves).
Why does the ground heat up more quickly than large bodies of water during the day, contributing to sea breezes?
The NCERT text explains, 'During the day, the ground heats up more quickly than large bodies of water do. This occurs both because water has a greater specific heat capacity and because mixing currents disperse the absorbed heat throughout the great volume of water.'
Which mode of heat transfer is essentially characterized by the movement of heated material itself?
Convection is defined as the mode of heat transfer by the actual motion of matter, which is the movement of the heated material itself. Conduction involves molecular vibrations without bulk movement, and radiation involves electromagnetic waves.
Which of the following statements about convection is INCORRECT?
The NCERT text states, 'Conduction and convection require some material as a transport medium. These modes of heat transfer cannot operate between bodies separated by a distance in vacuum.' Radiation, not convection, can occur in a vacuum.
A transverse wave is incident on a rigid boundary. What is the phase change experienced by the reflected wave?
According to the provided text, 'A travelling wave, at a rigid boundary or a closed end, is reflected with a phase reversal but the reflection at an open boundary takes place without any phase change.' A phase reversal corresponds to a phase change of $\pi$ or $180^\circ$.
Ready to ace NEET?
Free access · No credit card required
Yes. You can attempt every Physics 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.