Download App

STD 11 - 7. gravitation — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 7. gravitation4 Marks
MCQ
A satellite revolves around the earth in an elliptical orbit. Its speed
  • A
    Is the same at all points in the orbit
  • ✓
    Is greatest when it is closest to the earth
  • C
    Is greatest when it is farthest from the earth
  • D
    Goes on increasing or decreasing continuously depending upon the mass of the satellite
✓

Answer

Correct option: B.
Is greatest when it is closest to the earth
b
(b) Speed of satellite is greatest when it is closest to earth as near earth surface $r$

$\approx \mathrm{R}, \mathrm{V}_{0}=\sqrt{(\mathrm{GM} / \mathrm{r})}=7.9 \mathrm{kms}^{-1}$

This is maximum speed of satellite

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

A circular ring carries a uniformly distributed positive charge. The electric field $(E) $ and potential $ (V) $ varies with distance $(r)$ from the centre of the ring along its axis as
→
A piece of semiconductor is connected in series in an electric circuit. On increasing the temperature, the current in the circuit will
→
Which of the following atoms has the lowest ionization potential
→
A lift of mass $M =500\,kg$ is descending with speed of $2\,ms ^{-1}$. Its supporting cable begins to slip thus allowing it to fall with a constant acceleration of $2\,ms ^{-2}$. The kinetic energy of the lift at the end of fall through to a distance of $6 m$ will be $...........kJ.$
→
A bullet of mass $ a$  and velocity $b$ is fired into a large block of mass $c$. The final velocity of the system is
→
Two identical coils of radius $R$ and number of turns $N$ are placed perpendicular to each others in such a way that they have common centre. The current through them are $I$ and $I\sqrt 3$ . The resultant intensity of magnetic field at the centre of the coil will be  (in $weber/m^2)2$
→
A solid substance is at $30°C$. To this substance heat energy is supplied at a constant rate. Then temperature versus time graph is as shown in the figure. The substance is in liquid state for the portion (of the graph)
→
A metal wire has a resistance of $35 \,\Omega$. If its length is increased to double by drawing it, then its new resistance will be (in $\Omega$)
→
Two uniform solid balls of same density and of radii $r$ and $2r$ are dropped in air and fall vertically downwards. The terminal velocity of the ball with radius $r$ is $1\,cm\,s^{-1}$ , then find the terminal velocity of the ball of radius $2r$ (neglect bouyant force on the balls.) ........... $cm\,s^{-1}$
→
A thin uniform rod of length $l$ and mass $m$ is swinging freely about a horizontal axis passing through its end. Its maximum angular speed is $\omega $. Its centre of mass rises to a maximum height of
→