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11th Physics Weekly Test - 1 ( Gravitation )

MABS Institution

11th Physics Weekly Test - 1 ( Gravitation )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

The work done by Sun on Earth at any finite interval of time is

Positive, negative or zero
Strictly positive
Strictly negative
It is always zero

There is a small hole near the bottom of an open tank filled with a liquid the speed of water ejected does not depend on

area ofthe hole
density of liquid
acceleration due to gravity
both a & b

If a person moves from Chennai to Trichy, his weight

increases
decreases
remains same
increases and then decreases

A satellite is launched into a circular orbit of radius R around the earth. A second satellite is launched into an orbit of radius 4R. The ratio of their respective periods is

4:1
1:8
8:1
1:4

If the acceleration due to gravity at the surface of the earth is g, the work done in slowly lifting a body of mass in from the earth's surface to a height R equal to the radius of the earth is

\(\frac { 1 }{ 2 } \) mgR
2 mgR
mgR
\(\frac { 1 }{ 4 } \) mgR

If the density of small planet is that of the same as that of the earth while the radius of the planet is 0.2 times that of the Earth, the gravitational acceleration on the surface for the planet is __________.

0.2g
0.4g
2g
4g

A solid is completely immersed in a liquid the force exerted by the liquid on the solid will

increase if it is P used deeper inside the liquid
change if its orientation is changed
increase if it is taken partially out of liquid
be in the vertically upward direction

Air is pushed into a soap bubble of radius r to double its radius, of the surface tension of the soap solution is S, the work done in process is

8\(\pi\)r²S
12\(\pi\)r²S
16\(\pi\)r²S
24\(\pi\)r²S

If more air is pushed in a soap bubble, the pressure in it will

decreases
increases
remains same
becomes zero

An artificial satellite is revolving round the Earth in a circular orbit, its velocity is half the eacape velocity. Its height from the Earth surface is _________ km.

6400
12800
3200
1600

Part - B

Generic 2 - Answer All Question

A satellite moves in a circle around the Earth, the radius of this circle is equal to one half of the radius of the Moon's orbit. The satellite completes one revolution in lunar month.

The time period of a satellite of Earth is 5 hours. Hthe separation between the Earth and the satellite is increased to four times the previous value, the new time period will become.

Why does the gravitational potential energy U(r) is always negative
A body of mass 'm' kg starts falling from a point 2R above the Earth's surface. What is its K.E. When it has fallen to a point 'R' above the Earth's surface.

What is the gravitational potential energy of the Earth and Sun? The Earth to Sun distance is around 150 million km. The mass of the Earth is 5.9 × 10²⁴ kg and mass of the Sun is 1.9 × 10³⁰ kg.

Part - C

Generic 3 - Answer All Question

Why the gravitational force between the Earth and the Sun is so great while the same force between two small objects is negligible?

The following photographs are taken from the recent lunar eclipse which occurred on January 31, 2018. Is it possible to prove that Earth is a sphere from these photographs?

A Geo-stationary satellite bits around the earth in a circular but of radius 36,000 m then what will be the time period of a specially satellite orbiting a few hundred km above the earth's surface (R_earth = 6400 km)
Determine gravitational potential from gravitational potential energy?

What will be the potential energy of a body of mass 67kg at a distance of 6.6x 10¹⁰m from the centre of the earth? Find gravitational potential at this distance

Part - D

Generic 5 - Answer All Question

1. Calculate the value of g in the following two cases:
(a) If a mango of mass ½ kg falls from a tree from a height of 15 meters, what is the acceleration due to gravity when it begins to fall?
(b) Consider a satellite orbiting the Earth in a circular orbit of radius 1600 km above the surface of the Earth. What is the acceleration experienced by the satellite due to Earth’s gravitational force?

Qualitatively indicate the gravitational field of Sun on Mercury, Earth, and Jupiter shown in figure.

Two particles of masses mandm12 are placed along the x and y axes respectively at a distance ‘a’ from the origin. Calculate the gravitational field at a point P shown in figure below.
Explain how geocentric theory is replaced by heliocentric theory using the idea of retrograde motion of planets.

Water falls from the top of a hill to the ground. Why?This is because the top of the hill is a point of higher gravitational potential than the surface of the Earth i.e.
VV

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