MCQ
Assertion : A disc-shaped magnet is deviated above a superconducting material that has been cooled by liquid nitrogen.

Reason : Superconductors repel a magnet.

  • 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.
  • D
    If both the Assertion and Reason are incorrect.

Answer

Correct option: A.
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
a
Superconductors are actually diamagnetic in nature so when it is placed above a magnet it will be repelled by magnet or it will tend to move from higher field to lower field. This is  the principle behind leviation of a superconducting material above magnet.

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

Similar questions

Two electric bulbs, rated at $(25\, W, 220\, V)$ and $(100\, W, 220\, V)$, are connected in series acroos a $220\, V$ voltage source. If the $25\, W$ and $100\, W$ bulbs draw powers $P_1$ and $P_2$ respectively, then
A dip circle lies initially in the magnetic meridian, it shows an angle of dip $\delta$ at a place. The dip circle is rotated through an angle $\alpha$ in the horizontal plane and then it shows an angle of dip $\delta^{\prime}$. Hence $\frac{\tan \delta^{\prime}}{\tan \delta}$ is
A player kicks a football of mass $0.5\, kg$ and the football begins to move with a velocity of 10 m/s. If the contact between the leg and the football lasts for $\frac{1}{{50}}$ sec, then the force acted on the football should be ........... $N$
A man on a rectilinearly moving cart, facing the direction of motion, throws a ball straight up with respect to himself
The magnifying power of a telescope is $9.$ When it is adjusted for parallel rays the distance between the objective and eyepiece is $20\; cm.$ The focal length of lenses are 
A tangent galvanometer has $80$ turns of wire. The internal and external diameters of the coil are $19 \,cm$ and $21 \,cm$ respectively. The reduction factor of the galvanometer at a place where $H=0.32$ oersted will be $(1$ oersted $=80 \,A / m )$
A block of mass $m$ is at rest on an another block of same mass as shown in figure. Lower block is attached to the spring, then the maximum amplitude of motion so that both the block will remain in contact is
The centre of a wheel rolling on a plane surface moves with a speed $v_{0} .$ A particle on the rim of the wheel at the same level as the centre will be moving at a speed $\sqrt{x}\, v_{0}$. Then the value of $x$ is ...... .
The volume of an ideal gas $(\gamma=1.5)$ is changed adiabatically from $5$ litres to $4$ litres. The ratio of initial pressure to final pressure is:
$A$ particle is moving in a circular orbit of radius $r_1$ with an angular velocity $\omega_1$ . It jumps to another circular orbit of radius $r_2$ and attains an angular velocity $\omega_2$ . If $r_2 = 0.5\, r_1$ and assuming that no external torque is applied to the system, then the angular velocity $\omega_2$, is given by :