NEET UG PHYSICS MCQ: GRAVITATION

1 Easy

1 of 1

Analyzing +4 | -1

Assertion: Satellite is put in an orbit at a height where air resistance is present, then orbital velocity of the satellite will decrease.
Reason: Due to air resistance a lot of heat will be produced which may burn satellite

View answer and explanation

Correct option: B

Assertion is True, Reason is True; Reason is NOT a correct explanation for Assertion

Option B is correct because the assertion is true (orbital velocity decreases due to air resistance), the reason is also true (heat is produced), but the reason doesn't correctly explain the assertion. The decrease in velocity is due to energy loss from friction, not directly from the heat produced.

More Questions from GRAVITATION

Practice All Chapter MCQs →

If a particle of mass m is moving in a horizontal circle of radius r with a centripetal force

\left( { - K/{r^2}} \right)

the total energy is Suppose the law of gravitational attraction suddenly changes and becomes an inverse cube law i.e.

F \propto \frac{1}{r^3}

, but still remaining a central force. Then Two satellites A and B go round a planet P is circular orbits having radii 16 R and 2 R respectively. If the speed of satellite A is

6\,m{s^{ - 1}}

the speed of the satellite B will be [in m/s] nearly The total energy of satellite moving with an orbital velocity

v

around the earth is Two satellites of same mass are launched in the same orbit of radius

r

around the earth so as to rotate opposite to each other. If they collide inelastically and stick together as wreckage, the total energy of the system just after collision is Statement-1: There is almost no effect of rotation of earth at poles.
Statement-2: Because rotation of earth is about polar axis.