Given below are two statements: one is labelled as Assertion A an… - Vidyadip

MCQ

Given below are two statements: one is labelled as

Assertion $A$ and the other is labelled as Reason $R$.

Assertion $A :$ Earth has atmosphere whereas moon doesn't have any atmosphere.

Reason $R$ : The escape velocity on moon is very small as compared to that on earth.

In the light of the above statement, choose the correct answer from the options given below :

A
$A$ is true but $R$ is false
B
$A$ is false but $R$ is true
C
Both $A$ and $R$ are correct but $R$ is $NOT$ the correct explanation of $A$
✓
Both $A$ and $R$ are correct and $R$ is correct explanation of $A$

✓

Answer

Correct option: D.

Both $A$ and $R$ are correct and $R$ is correct explanation of $A$

d
At Moon, due to low escape velocity, the rms velocity of molecules is greater than escape velocity. Hence molecules escape and there is no atmosphere at Moon.

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

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

Similar questions

In a semiconductor, the number density of intrinsic charge carriers at $27^{\circ} {C}$ is $1.5 \times 10^{16} \,/ {m}^{3}$. If the semiconductor is doped with impurity atom, the hole density increase to $4.5 \times 10^{22}\, / {m}^{3}$. The electron density in the doped semiconductor is $.....\,\times 10^{9} / {m}^{3}$

A neutron makes a head-on elastic collision with a stationary deuteron. The fractional energy loss of the neutron in the collision is

The resistivity of a potentiometer wire is $40 \times {10^{ - 8}}\,ohm - m$ and its area of cross-section is $8 \times {10^{ - 6}}\,{m^2}$. If $0.2\, amp$ current is flowing through the wire, the potential gradient will be

A simple pendulum is attached to the roof of a lift. If time period of oscillation, when the lift is stationary is $T$. Then frequency of oscillation, when the lift falls freely, will be

The identical metal plates with large surface areas are kept parallel to each other as shown in figure. The left most plate is given a charge $Q$ , the rightmost a charge $-2Q$ and the middle one remains neutral. Find the charge appearing on the outer surface of the rightmost plate

A small pin fixed on a table top is viewed from above from a distance of $50\, cm$. By what distance would the pin appear to be raised if it is viewed from the same point through a $15\, cm$ thick glass slab held parallel to the table? Refractive index of glass $= 1.5$ ?......$cm$

Consider a sphere of radius $R$ having charge $q$ uniformly distributed inside it. At what minimum distance from its surface the electric potential is half of the electric potential at its centre?

The angle of a prism is $A$. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence $2A$ on the first surface returns back through the same path after suffering reflection at the silvered surface. The refractive index $\mu$, of the prism is

$A$ and $B$ possess unequal dimensional formula then following operation is not possible in any case:-

The distance of a geo-stationary satellite from the centre of the earth (Radius $R = 6400\, km$) is nearest to