Download App

STD 11 - 10.2 , transmission of heat — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 10.2 , transmission of heat4 Marks
MCQ
$Assertion :$ A hollow metallic closed container maintained at a uniform temperature can act as a source of black body radiation.
$Reason :$ All metals act as black bodies.
  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • ✓
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: D.
If both the Assertion and Reason are incorrect.
d
A perfect black body is one which absorbs all heat radiations (whatever be the
wavelength) incident on it. No natural object is a perfect black body. Best approximations are lamp black and platinum black. Fery's black body is a double walled metallic sphere coated with lamp black on the inside and nickel on outside. It has a narrow opening opposite a conical projection inside.

$\therefore $ Both Assertion and Reason are incorrect

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

JEE STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

A hydrogen atom (ionisation potential $ 13.6\, eV$) makes a transition from third excited state to first excited state. The energy of the photon emitted in the process is.......$eV$
→
Volt/metre is the unit of
→
A $p-n$ photodiode is made of a material with a band gap of $2.0\, eV$. The minimum frequency of the radiation that can be absorbed by the material is nearly
→
The frequency of $1^{st}$ line of Balmer series in ${H_2}$ atom is ${\nu _0}$. The frequency of line emitted by singly ionised He atom is
→
A block of mass $m$ is stationary on a rough plane of mass $M$ inclined at an angle $\theta$ to the horizontal, while the whole set up is accelerating upwards at an acceleration $\alpha$. If the coefficient of friction between the block and the plane is $\mu$, then the force that the plane exerts on the block is
→
A monochromatic light is incident on a hydrogen sample in ground state. Hydrogen atoms absorb a fraction of light and subsequently emit radiation of six different wavelengths. The frequency of incident light is $x \times 10^{15}\,Hz$. The value of $x$ is (Given $h =4.25 \times 10^{-15}\,eVs$ )
→
A wire is stretched by $0.01$ $m$ by a certain force $F.$ Another wire of same material whose diameter and length are double to the original wire is stretched by the same force. Then its elongation will be
→
A man runs towards mirror at a speed of $15\,m/s.$What is the speed of his image.....$m/s$
→
Three particles each of mass $M$ are placed at the three corners of an equilateral triangle of side $l$ . What is the force due to this system of particles on another particle of mass $m$ placed at the mid -point of any side?
→
Which of the diagrams shown in figure represents variation of total mechanical energy of a pendulum oscillating in water as function of time ?
→