A thin paper cup filled with water does not catch fire when place… - Vidyadip

MCQ

A thin paper cup filled with water does not catch fire when placed over a flame. This is because

A
the water cuts off oxygen supply to the paper cup
B
water is an excellent conductor of heat
✓
the paper cup does not become appreciably hotter than the water it contains
D
paper is a poor conductor of heat

✓

Answer

Correct option: C.

the paper cup does not become appreciably hotter than the water it contains

c
(c)

Thermal resistance of thin layer of paper is quite less, so heat reaches across the paper and water absorbs that heat. Temperature of paper does not rises beyond $100^{\circ} C$ and upto its burning temperature.

$\therefore$ Paper cup does not catches fire.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 10.2 , transmission of heat→10.2 , transmission of heat — all question types→Physics STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Two satellite $A$ and $B$ go round a planet in circular orbits having radii $4 R$ and $R$ respectively. If the speed of $\mathrm{A}$ is $3 v$, the speed of $\mathrm{B}$ will be :

When an electron strikes the target in a Coolidge tube, its entire kinetic energy:

The radius of a disc is $1.2\; cm$. Its area according to the concept of significant figures will be given by

A body of mass $2 \,kg$ is projected vertically upwards with a velocity of $2\,m\,{\sec ^{ - 1}}$. The K.E. of the body just before striking the ground is ............. $\mathrm{J}$

A body of mass $m_1$ exerts a force on another body of mass $m_2$. If the magnitude of acceleration of $m_2$ is $a_2$, then the magnitude of the acceleration of $m_1$ is (considering only two bodies in space)

A planet is revolving ground the sun in an elliptical orbit. Its closest distance from the sun is $r_{min}$ , the farthest distance from the sun is $r_{max}$ . If the orbital angular velocity of the planet when it is the nearest to the sun is $\omega $, then the orbital angular velocity at the point when it is at the farthest distance from the sun is

A particle performs simple harmonic motion with amplitude $A$. Its speed is trebled at the instant that it is at a distance $\frac{{2A}}{3}$ from equilibrium position. The new amplitude of the motion is

What is the number of significant figures in $11.118 \times 10^{ - 6}\,V$

A polyatomic gas $\left( {\gamma = \frac{4}{3}} \right)$ is compressed to $\frac{1}{8}$ of its volume adiabatically. If its initial pressure is ${P_o}$, its new pressure will be

$Assertion$ : On a rainy day it is difficult to drive a car or bus at high speed.
$Reason$ : The value of coefficient of friction is lowered due to wetting of the surface