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# GRAVITATION

Encircle the most appropriate answer from the following options

(a) Galileo

(b) Newton

(c) Einstein

2.         Unit of gravitational field strength is:

(a) N

(b) N kg-1

(c) J

(d) Nm

3.         Distance of the moon from Earth is?

(a) 38, 000 km

(b) 3, 80, 000 km

(c) 3, 000, 000 km

(d) 30, 000 km

4.         Speed of GPS satellite is:

(a) 7.9 kms1

(b) 3.87 kms1

(c) 5.6 kms1

(d) 5.0 kms1

5.         If the distance between two masses is half then what will be the force of gravitation becomes:

(a) One fourth

(b) Four times

(c) Doubled

(d) Half

6.         In SI , the value of G is:

(a) 6.4 x 106Nm2kg2

(b) 6.4 x 10-11Nm2kg2

(c) 6.67 x 1011Nm2kg2

(d) 6.67 x 10– 11Nm2kg2

7.         What is the Radius of earth :

(a) 6.4 x 106 km

(b) 6.4 x 106m

(c) 6 x 106m

(d) 6 x 106 km

8.         The System International unit of gravitational force is:

(a) Nm2kg2

(b) Newton

(c) ms2

(d) both “a” and b

9.         What will be the value of G if mass of the earth becomes four times will be:

(a) No change

(b) Four times

(c) One fourth

(d) Doubled

10.       The mass of Earth is approximately:

(a) 6.9 x 1024 kg

(b) 6.0 x 1024 kg

(c) 6.0 x 1024 kg

(d) 5500 x 1024 kg

11.       As we move to top the value of G becomes:

(a) Unchanged

(b) Increases

(c) Decreases

(d) Doubled

12.       The force which pulls the object towards the center of circle is known as ——-—- force:

(a) Frictional

(b) Coulomb

(c) Centripetal

(d) Gravitational

13.       When a body is at a height equal to radius of earth above the surface of the earth. What will be the value of gh?

(a) 4g

(b) 2g

(c) g/2

(d) g/4

14.       What is not true about g?

(a) g is different at different places

(b) g is greater at poles

(c) g is less at poles

(d) g decrease as go higher

15.       If the weight of a body on the surface of earth is W. Then what will weight on the surface of moon  be:

(a) 6W

(b) W/6

(c) W/4

(d) W/8

16.       Our weight on mountain as compared to weight on the surface of earth.

(a) Equal

(b) Greater

(c) Less

(d) None of above

17.       If mass of both the objects is 1kg and distance between their centers is 1m then the gravitational force is equal to:

(a) G

(b) g

(c) V

(d) None of above

19.       An artificial satellite continuously revolving around the earth in different orbits with uniform speed due to what?

(a) Gravitational force

(b) Frictional force

(c) Coulomb force

(d) Electromagnetic force

20.       The Relative velocity of Geostationary satellite with respect to earth will be:

(a) 7.9 kms1

(b) 11.2 kms1

(c) 9.8 ms1

(d) zero

21.       If a rocket is fired vertically in what speed that, it will start revolving around the earth:

(a) 8 ms1

(b) 8 kms1

(c) 9.8 ms1

(d) 11.2 kms1

22.       The Height of the Geostationary satellite above the surface of earth is:

(a) 1000 km

(b) 3600 km

(c) 36000 km

(d) 42300 km

23.       Gravitational force on the surface of earth will be equals to:

(a) G

(b) g

(c) W

(d) All of above

24.       Weight of the body of mass 10 kg on the surface of moon will be:

(a) 160 N

(b) 16N

(c) 1.62 N

(d) None of above

25.      Earth’s gravitational force of attraction vanishes at:

(a) 6400 km

(b) infinity

(c) 42300 km

(d) 1000 km

26.       Value of g increases with the:

(a) Increase in mass of body

(b) increase in altitude

(c) decrease in altitude

(d) none of the above

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

(a) 2 g

(b)1/2 g

(c) 1/3 g

(d) 1/4 g

28.    The value of g on the moon’s surface is 1.6 ms. Then What will the weight of a 100 kg body on the surface of the moon be?

(a) 100 N

(b) 160 N

(c) 1000 N

(d) 1600 N

29.       The altitude of geostationary orbits in which communications satellites are launched above the surface of Earth is:

(a) 850 km

(b) 1000 km

(c) 6400 km

(d) 42300 km

30.       The orbital speed of a low orbit satellite is:

(a) zero

(b) 8 ms

(c) 800 ms

(d) 8000 ms’

31.       Earth’s gravitational force vanishes at:

(A) 6400 km

(B) Infinity

(C) 42300 Km

(D) 1000 km

32.        Moon completes its one revolution around the earth in:

(A) One day

(B) 17.3 days

(C) 22.3 days

(D) 27.3 days

33.         What will be the orbital speed of a low orbit satellite :

(A) Zero

(B) 8 Km/s

(C) 800 ms-¹

(D) 8000 ms-¹

34.         The value of “g” at the moon is:

(A) 1.7 ms-²

(B) 1.6 ms-²

(C) 10 ms-²

(D) 9.8 ms-²

35.         A force which is inversely proportional to the square the distance between the centers of bodies is:

(A)Frictional force

(B) Centrifugal force

(C) Centripetal force

(D) Gravitational force

36.        The centre of gravity of an irregular shaped object can be found with the help of:

(A) Screw gauge

(B) Plumbline

(C) Meter rod

(D) Wedge