JEE PHYSICS UNIT 06
QUIZ NO 3
TOTAL QUESTIONS = 20
1. The gravitational force between two objects is proportional to
A. Product of their masses
B. Sum of their masses
C. Difference of their masses
D. Square of their masses
2. The escape velocity from the surface of a planet depends on
A. Mass of the planet only
B. Radius of the planet only
C. Mass and radius of the planet
D. Density of the planet
3. The value of acceleration due to gravity decreases with
A. Increase in height above the surface of Earth
B. Increase in depth below the surface of Earth
C. Both a and b
D. None of these
4. If the radius of Earth decreases by 1% while its mass remains constant, the acceleration due to gravity at its surface will
A. Increase by 2%
B. Decrease by 2%
C. Increase by 1%
D. Remain unchanged
5. Kepler’s third law states that the square of the time period of a planet is proportional to
A. Cube of the semi-major axis
B. Square of the semi-major axis
C. Semi-major axis
D. Cube root of the semi-major axis
6. The gravitational potential at a point is defined as
A. Work done in moving a unit mass from infinity to that point
B. Work done in moving a unit mass from the center to that point
C. Force experienced by a unit mass at that point
D. Work done in moving a unit mass from that point to infinity
7. The time period of a satellite in a circular orbit of radius R around Earth is proportional to
A. R
B. R²
C. √R
D. R³/2
8. A satellite is revolving around Earth in a circular orbit. The energy required to move the satellite to a higher orbit will be
A. Positive
B. Negative
C. Zero
D. Infinity
9. The variation of acceleration due to gravity with height h above the Earth’s surface is approximately given by
A. g(1 - 2h/R)
B. g(1 - h/R)
C. g(1 - 2R/h)
D. g(1 - R/h)
10. The escape velocity from Earth is 11.2 km/s. If the mass of Earth were halved while its radius remained the same, the escape velocity would be
A. 5.6 km/s
B. 11.2 km/s
C. 22.4 km/s
D. 7.9 km/s
11. The value of gravitational potential at a point inside a uniform spherical shell is
A. Zero
B. Constant and non-zero
C. Varies linearly with distance from the center
D. Varies as the square of the distance from the center
12. The ratio of gravitational acceleration on the surface of the Moon to that on the Earth is approximately
A. 1/6
B. 1/2
C. 1/4
D. 1/8
13. A geostationary satellite revolves around the Earth from
A. East to west
B. West to east
C. North to south
D. South to north
14. The total energy of a satellite in a circular orbit is equal to
A. Its kinetic energy
B. Twice its potential energy
C. Half of its potential energy
D. Its potential energy
15. The acceleration due to gravity on the Moon’s surface is one-sixth that of Earth. If the time period of a simple pendulum on Earth is T, its time period on the Moon will be
A. T/√6
B. T
C. T√6
D. 6T
16. A particle is thrown vertically upwards with a velocity less than escape velocity. The sum of its kinetic and potential energy is
A. Zero
B. Positive
C. Negative
D. Infinity
17. A satellite revolving around the Earth is in a stable orbit. If its speed increases slightly, the radius of its orbit will
A. Increase
B. Decrease
C. Remain unchanged
D. Becomes infinity
18. The work done by the gravitational force on a satellite moving around Earth in a circular orbit is
A. Positive
B. Negative
C. Zero
D. Infinity
19. The ratio of escape velocity to orbital velocity for a planet is
A. 1:√2
B. √2:1
C. 1:1
D. 2:1
20. If the Earth were to rotate faster, the value of g at the equator would
A. Increase
B. Decrease
C. Remain unchanged
D. Depend on latitude
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