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NEET Physics : Gravitation

Multiple Choice Questions

41.

Radius of orbit of satellite of earth is R. Its kinetic energy is proportional to

$\frac{1}{R}$
$\frac{1}{\sqrt{R}}$
R
$\frac{1}{R^{\frac{3}{2}}}$

42.

The earth of mass =6×10²⁴ kg revolves around the sun with an angular velocity of 2×10^-7 rad/s in a circular orbit of radius 1.5×10⁸ km. The force exerted by the sun on earth is

6×10¹⁹ N
18×10²⁵ N
36×10²¹ N
27×10³⁹ N

43.

Two planets are revolving around the earth with velocities v₁ and v₂ and in radii r₁ and r₂ ( r₁ > r₂ ) respectively. Then :

v₁ = v₂
v₁ > v₂
v₁ < v₂
$\frac{v_{1}}{r_{1}} = \frac{v_{2}}{r_{2}}$

44.

The ratio of electrostatic and gravitational forces acting between electron and proton separated by a distance 5×10¹¹m will be (charge on electron =1.6×10^-19 C, mass of electron =9.1×10^-31 kg, mass of proton =1.6×10^-27 kg, G=6.7×10^-11 Nm²/kg² )

2.36×10³⁹
2.36×10⁴⁰
2.36×10⁴¹
2.34×10⁴²

45.

A ball is thrown upwards, it takes 4sec to reach back to the ground. Find its initial velocity

30ms^-1
10ms^-1
40ms^-1
20ms^-1

46.

Acceleration due to gravity at earth's surface is 'g'ms^-2 . Find the effective value of gravity at a height of 32 km from sea level (R_e=6400km)

0.5 gms^-2
0.99 gms^-2
1.01 gms^-2
0.90 gms^-2

47.

Near earth's surface, time period of a satelliteis 4 hrs. Find its time period at height '4R' from the centre of earth

32 hrs
$(\frac{1}{8 \sqrt[3]{2}}) hrs$
8 $\sqrt[3]{2}$ hrs
16hrs

48.

The dimensions of gravitational constant are

$[{ML}^{3} T^{- 2}]$
$[M^{- 1} L^{2} T^{- 2}]$
$[{ML}^{- 2} T^{2}]$
$[M^{- 1} L^{3} T^{- 2}]$

49.

Dimension of relative density is

kgm^-3
ML^-³
dimensionless
M²L^-6

50.

A ball is thrown from height 'h' and another from '2h'. The ratio of time taken by the two balls to reach ground is

$1 : \sqrt{2}$
$\sqrt{2} : 1$
2:1
1:2

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Subject

NEET Physics : Gravitation

Multiple Choice Questions