Observe the picture given in figure. Water is being boiled in a pan of wide base.
$(i)$. Which position P or T will feel warmer?
$(ii)$. Fill up the boxes P and T to indicate the mode of flow of heat to the hand."
$(i)$ As the hot air is rising up, $P$ will feel warmer.
$(ii)$. $P\rightarrow$Convection, which is the heat transfer taking place in fluids and gases by bulk movement of molecules.
$T\rightarrow$Radiation, which is the heat transfer through any medium.
Related Articles
- Find \( p(0), p(1) \) and \( p(2) \) for each of the following polynomials:(i) \( p(y)=y^{2}-y+1 \)(ii) \( p(t)=2+t+2 t^{2}-t^{3} \)(iii) \( p(x)=x^{3} \)(iv) \( p(x)=(x-1)(x+1) \)
- The graphs of $y = p(x)$ are given in figure below, for some polynomials $p(x)$. Find the number of zeroes of $p(x)$, in each case.(i)(ii)(iii)(iv)(v)(vi)"
- How to extract the p-value from t test in R?
- A triangle \( P Q R \) is drawn to circumscribe a circle of radius \( 8 \mathrm{~cm} \) such that the segments \( Q T \) and \( T R \), into which \( Q R \) is divided by the point of contact \( T \), are of lengths \( 14 \mathrm{~cm} \) and \( 16 \mathrm{~cm} \) respectively. If area of \( \Delta P Q R \) is \( 336 \mathrm{~cm}^{2} \), find the sides \( P Q \) and \( P R \).
- When we touch a hot plate unknowingly, then this heat is sensed by a receptor P present in our fingers. The receptor triggers an impulse in neuron Q which transmits the message to an organ R which is a part of the central nervous system. Here the impulse is passed on to a neuron S which in turn passes it to a yet another neuron T. The neuron T passes the impulse to a issue U in our arm. The tissue U then contracts and pulls our hand away from the hot plate.(a) What is the name of (i) receptor P (ii) neuron Q, and (iii) organ R?(b) What is (i) neuron S, and (ii) neuron T?(c) Name the tissue U.(d) What name is given to the phenomenon in which hand is pulled away quickly from the hot plate?(e) Name the effector in this whole process.
- In an ecosystem :(i) the flow of energy is unidirectional(ii) the flow of materials is unidirectional(iii) the flow of materials is cyclic(iv) the flow of energy is cyclic.(a) (i) and (ii) (b) (ii) and (iii) (c) (i) and (iv) (d) (i) and (iii)
- Figure A and B, show a bulb connected to a cell in two different ways.$(i)$. What will be the direction of the current through the bulb in both the cases $(Q\ to\ P\ or\ P\ to\ Q)$?$(ii)$. Will the bulb glow in both cases?$(iii)$. Does the brightness of the glowing bulb depend on the direction of current through it?"
- What is the cause of heat generation in the following situations:\na. We apply brakes on a fast moving car.\nb. People often jump up and down to feel warmer in cold weather.
- In which of the following circuits A, B, and C given in figure, the cell will be used up very rapidly?"
- The chemical substance P is made and secreted by the meristematic tissue at the tip of stem (or shoot) of a plant. The chemical substance P is responsible for a phenomenon Q in plants in which the stem bends towards a source of light. The same chemical substance P has an opposite effect on the root of a plant. It causes the root of a plant to bend away from the source of light in a process called R.(a) What is the chemical substance P ?(b) State whether P prefers to remains in the sunlit side of a stem or in shade.(c) What is the effect of substance P on the rate of growth (i) a root, and (ii) a stem ?(d) What is the name of process (i) Q, and (ii) R ?(e) What is the general name of chemical substances like P ? Name another substance which belongs to this class of chemical substances.
- Why can't we connect a positive and a positive terminal? Will the electricity flow or not?
Kickstart Your Career
Get certified by completing the course
Get Started