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Quiz
CBSE
/
Class 11
/
Physics
/
Chapter 8 Gravitation
1.
The value of g at a particular point is 9.8 m/sec² suppose the earth suddenly shrink uniformly to half its present size without losing any mass. The value of g at the same point (assuming that the distance of the point from the centre of the earth does not shrink) will become
9.8 m/sec²
4.9 m/sec²
19.6 m/sec²
2.45 m/sec²
2.
A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energy is
Positive
Negative
Zero
may be positive or negative
3.
If the radius of the earth were to be raise by 1% its mass remaining the same, the acceleration due to gravity on the surface of the earth will
increase by 1%
decrease by 2%
decrease by 1%
increase by 2%
4.
A body is projected vertically from the surface of the earth of radius R with velocity equal to half of the escape velocity. The maximum height reached by the body is
R
R/2
R/3
R/4
5.
The escape velocity of projection from the earth is approximately (R = 6400 km)
7 km/sec
112 km/sec
12.2 km/sec
1.1 km/sec
6.
Who among the following first gave the experimental velocity of G?
Cavendish
Copernicus
Brook Taylor
none of these
7.
A satellite S is move in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of the earth .
The acceleration of S is always directed towards the centre of the earth.
The angular momentum of S about the centre of the earth changes in direction, but its magnitude remains constant.
The total mechanical energy of S varies periodically with time.
The linear momentum of S remains constant in magnitude.
8.
The mean radius of the earth is R, its angular speed on its own axis is w and the acceleration due to gravity at earths surface is g. The cube of the radius of the orbit of a geo-stationary satellite will be
r²g / w
R²w²/ g
RG w²
R²g / w²
9.
If the distance between the earth and the sun were half its present value, the number of day in a year would have been
64.5
129
182.5
730
10.
The masses of two planets are in the ratio 1 : 2. Their radii are in the ratio 1 : 2. The acceleration due to gravity on the planets are in the ratio.
1 : 2
2 : 1
3 : 5
5 : 3
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