Physics MCQs for Class 9 with Answers Chapter 4

The orbital velocity of a satellite revolving at height ‘h’ above the surface of Earth is given by

________ is the height of an object or place above sea level.

Altitude

Depth

Sun

Moon

The force exerted by earth on moon is :

2.01× 1020 N

2.01× 1020 Kg

2.01× 1021 N

2.01× 1022 Kg m/s2

A body is placed at height ‘h’ above the surface of the Earth.The value of ‘g’ is given by

gh = Me/(R + h)2

gh = GMe/(R +h)2

gh = GMe/R2h

The velocity of geostationary satellites with respect to the Earth is:

Maximum

Zero

Minimum

100 ms-1

The value of G is __________ Nm2 kg-2.

6.67 x 10-11 Nm2 kg-1

6.67 x 10-11Nm2kg

6.67 x 10-11Nm2kg-2

6.67 x 10-11Nm kg-1

The speed of satellites in GPS is:

8.73 kms-1

3.87 ms-1

32 ms-1

3.87 kms-1

The altitude of geostationary orbits in which communication satellites are launched above the surface of the Earth is

850 km

1000 km

6400 km

42,300 km

The value of g at a height one Earth’s radius above the surface of the Earth is:

2 g

1/2 g

1/3 g1

1/4 g

Weight of the body when we increase its height from earth’s surface.

Increase

Decrease

Remain constant

None