MCQ
For a perfectly black body, its absorptive power is
- ✓$1$
- B$0.5$
- C$0$
- DInfinity
✓
Answer
Correct option: A.
$1$
a
(a)A perfectly black body is a good absorber of radiations falls on it. So it’s absorptive power is $1$ .
(a)A perfectly black body is a good absorber of radiations falls on it. So it’s absorptive power is $1$ .
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A bar is subjected to axial forces as shown. If $E$ is the modulus of elasticity of the bar and $A$ is its crosssection area. Its elongation will be
→The average acceleration vector for a particle having a uniform circular motion is
The velocity of a particle is $v=v_0 +gt+ft^2$. If its position is $x= 0$ at $t= 0 $, then its displacement after unit time ($t= 1$) is
→If the string of a conical pendulum makes an angle $\theta$ with horizontal, then square of its time period is proportional to
→A ball is dropped from a height of $20\,m$. If the coefficient of restitution for the collision between ball and floor is $0.5$, after hitting the floor, the ball rebounds to a height of $.............m$.
→A ball of mass $( m )=0.5 \ kg$ is attached to the end of a string having length $(L)$ $=0.5 m$. The ball is rotated on a horizontal circular path about vertical axis. The maximum tension that the string can bear is $324 \ N$. The maximum possible value of angular velocity of ball (in radian/s) is
→Which of the following $($referred to a spherical mirror$)$ do $($does$)$ not depend on whether the rays are paraxial or not?
→A gas is enclosed in a vessel at a constant temperature at a pressure of $5$ atmosphere and volume $4$ litre. Due to a leakage in the vessel, after some time, the pressure is reduced to $4$ atmosphere. As a result, the
→In the three states of matter, the elastic coefficient can be
The maximum velocity (in $ms^{-1}$) with which a car driver must traverse a flat curve of radius $150 \,m$ and coefficient of friction $0.6$ to avoid skidding is
→