MCQ
$Assertion$ : The length of the day is slowly increasing.
$Reason$ : The dominant effect causing a slowdown in the rotation of the earth is the gravitational pull of other planets in the solar system.
  • 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.
  • If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.

Answer

Correct option: C.
If the Assertion is correct but Reason is incorrect.
c
The length of the day is slowly increasing not due to gravitational pull of other planets in the solar system but due to viscous force between the earth and the atmosphere around it. So Assertion is correct but Reason is 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

Similar questions

The binding energies of nuclei $X$ and $Y$ are $E_1$ and $E_2$ respectively. Two atoms of $X$ fuse to give one atom of $Y$ and an energy $Q$ is released. Then :
A steel rod $100 \,cm$ long is clamped at its middle. The fundamental frequency of longitudinal vibrations of the rod are given to be $2.53\,kHz$. What is the speed of sound in steel ..... $km/sec$
The wavelength of maximum energy, released during an atomic explosion, was $2.93 × 10$$^{-{10}}$ m. Given that the Wien's constant is $2.93 × 10$$^{-{3}}$ m K, the maximum temperature attained must be of the order of
Equal charges are given to two spheres of different radii. The potential will
In a $PN-$junction diode
An electron is projected along the axis of a circular conductor carrying some current. Electron will experience force
For the given combination of gates, if the logic states of inputs $ A, B, C$ are as follows $A = B = C = 0$ and $A = B = 1, C = 0$ then the logic states of output $D $ are
In the given reaction :

 $\begin{array}{*{20}{c}}
  {{C_6}{H_5} - C - H} \\ 
  {\,\,\,\,\,\,\,\,\,\,||} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,\,O} 
\end{array}\xrightarrow{{N{H_2}OH/{H^ \oplus }}}[X]$

$[X] $ will be :

Two satellites $S _{1}$ and $S _{2}$ are revolving in circular orbits around a planet with radius $R _{1}=3200 \,km$ and $R _{2}=800\, km$ respectively. The ratio of speed of satellite $S_{1}$ to the speed of satellite $S_{2}$ in their respective orbits would be $\frac{1}{ x }$ where $x =$
Flux $\phi $ (in weber) in a closed circuit of resistance $10\, ohm$ varies with time $t$ (in $sec$) according to the equation $\phi  = 6t^2 - 5t +1$ . What is the magnitude of the induced current at $t = 0.25\, s$ ?.....$A$