Three objects colored black, gray and white can withstand hostile… - Vidyadip

MCQ

Three objects colored black, gray and white can withstand hostile conditions upto $2800\,^oC$. These objects are thrown into a furnace where each of them attains a temperature of $2000\,^oC$. Which object will glow brightest?

A
the white object
✓
the black object
C
all glow with equal brightness
D
gray object

✓

Answer

Correct option: B.

the black object

b
Black has greatest emissivity and greatest absorbtivity as compared with other colours. At $2000\,^oC$ it will have greatest emissivity so it will glow brightest.

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

A particle of mass $m$ is driven by a machine that delivers a constant power $k$ watts. If the particle starts from rest the force on the particle at time $t$ is

Two cars are moving in the same direction with the same speed $30 \,km/hr$. They are separated by a distance of $5\, km$, the speed of a car moving in the opposite direction if it meets these two cars at an interval of $4$ minutes, will be.......$km/hr$

A simple pendulum is vibrating in an evacuated chamber, it will oscillate with

A boy prevents fall of his book on the ground by pressing it against a vertical wall. If weight of his book is $10\ kg$ and us of the wall is $0.2.$ Find the minimum force needed by him in his attempt.

A student is performing the experiment of resonance column. The diameter of the column tube is $6 \,cm$. The frequency of the tuning fork is $504\, Hz$. Speed of the sound at the given temperature is $336\, m / s$. The zero of the meter scale coincides with the top end of the resonance column tube. The reading of the water level in the column when the first resonance occurs is..........$cm$

The pressure of an ideal gas varies with volume as $P = \alpha V,$ where $\alpha $ is a constant. One mole of the gas is allowed to undergo expansion such that its volume becomes $'m'$ times its initial volume. The work done by the gas in the process is

Planck's constant $h$, speed of light $c$ and gravitational constant $G$ are used to form a unit of length $L$ and a unit of mass $M$. Then the correct option$(s)$ is(are)

$(A)$ $M \propto \sqrt{ c }$ $(B)$ $M \propto \sqrt{ G }$ $(C)$ $L \propto \sqrt{ h }$ $(D)$ $L \propto \sqrt{G}$

Select the correct statement regarding stream line flow

If the particle repeats its motion after a fixed time interval of $8 \,s$ then after how much time its maximum value of $PE$ will be attained after attaining its minimum value is ........... $s$

In a projectile motion, velocity at maximum height is