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XI Physics New Chap 7 Gravitation 77 Profound True Statements.
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XI Physics New Chap 7 Gravitation 77 Profound True Statements.
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XI Physics_New Chapter-7_GRAVITATION_[True or False Statement Questions]Sl # Statements [7.1 Intro; 7.2 Kepler's Laws; 7.3 1 Universal Law of Gravitation] True/False
Aryabhatta, in the 5th century A.D., mentioned the heliocentric model, where the Sun is the
1 TRUE
center around which the planets revolve.
For a hollow spherical shell of uniform density, the force of attraction on a point mass
2 TRUE
outside the shell is as if all the shell's mass were concentrated at its center.
Galileo recognized that all objects are accelerated toward the Earth with a constant
3 TRUE
acceleration, irrespective of their masses.
Gravitational force between a hollow spherical shell and a point mass outside is as if the
4 TRUE
entire shell's mass is concentrated at its center.
Inside a hollow spherical shell of uniform density, the gravitational force on a point mass is
5 TRUE
zero.
Kepler's first law states that all planets move in elliptical orbits with the Sun situated at one
6 TRUE
of the foci.
Kepler's laws describe planetary motion, including the law of orbits, law of areas, and law of
7 TRUE
periods.
Kepler's second law states that a line joining any planet to the Sun sweeps equal areas in
8 TRUE
equal intervals of time, indicating that planets move faster when closer to the Sun.
Kepler's Third Law of Planetary Motion states that the square of a planet's time period is
9 TRUE
proportional to the cube of its semi-major axis.
Newton's Law of Gravitation: Objects in the universe attract each other with force
10 TRUE
proportional to masses and inversely proportional to distance squared.
Ptolemy's geocentric model suggested that all celestial objects, including stars, the Sun, and
11 TRUE
planets, revolved around the Earth in circular orbits.
The gravitational force on a point mass due to another point mass can be calculated using
12 TRUE
the formula F = G * (m1 * m2) / r^2.
The Law of Areas in Kepler's Laws states that planets sweep equal areas in equal intervals of
13 TRUE
time, related to their motion.
Tycho Brahe's observations of planets were analyzed by Johannes Kepler, who formulated
14 TRUE
three laws known as Kepler's laws.
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, XI Physics_New Chapter-7_GRAVITATION_[True or False Statement Questions]
Statements [7.4 THE GRAVITATIONAL CONSTANT; 7.5 ACCELERATION DUE TO GRAVITY OF
Sl # THE EARTH; 7.6 ACCELERATION DUE TO GRAVITY BELOW AND ABOVE THE SURFACE OF True/False
EARTH; 7.7 GRAVITATIONAL POTENTIAL ENERGY]
Cavendish's experiment involved two large spheres, Si and S2, which were used to measure
1 TRUE
the gravitational constant by observing the rotation of a bar AB.
English scientist Henry Cavendish determined the gravitational constant G experimentally in
2 TRUE
1798.
Gravitational forces between objects follow an inverse square law, and the gravitational
3 TRUE
potential energy between two objects is given by -GMm/r.
Gravitational potential decreases as one moves further from the Earth's surface, following a
4 TRUE
1/r relationship.
Gravitational potential energy between two masses is U = -G * (m1 * m2) / r, with U, G, m1,
5 TRUE
m2, and r defined.
Gravitational potential energy depends on the mass of the body and its distance from the
6 TRUE
center of the Earth.
Gravitational potential energy is a scalar quantity and does not have a direction associated
7 TRUE
with it.
Gravitational potential energy measures work to move an object from infinity to a distance
8 TRUE
from a massive body, relative to zero potential energy at infinity.
The acceleration due to gravity, g, on the surface of the Earth is approximately 9.81 m/s^2.
9 TRUE
The gravitational constant G is responsible for the gravitational force between masses and
10 TRUE
has the value of approximately 6.67 x 10^-11 N m^2/kg^2.
The gravitational constant G is used to calculate the gravitational force between two masses
11 TRUE
and is essential for understanding gravitation.
The gravitational potential at a point is the potential energy of a unit mass placed at that
12 TRUE
point in a gravitational field.
The gravitational potential at the center of a square formed by four particles at its vertices is
13 -5.41 times the gravitational potential at a distance of one unit from one of the particles. TRUE
The gravitational potential energy of a system of particles can be calculated by summing the
14 TRUE
potential energies of all possible pairs of particles in the system.
The universal law of gravitation applies to all masses, stating gravity force is proportional to
15 TRUE
mass product and inversely proportional to distance squared.
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