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11th Physics Weekly Test - 3 ( Gravitation )

MABS Institution

11th Physics Weekly Test - 3 ( Gravitation )-Aug 2020

Time : 1.00 Hours

Part - A

Multiple Choice Question - Answer All Question

The gravitational potential energy of the Moon with respect to Earth is

always positive
always negative
can be positive or negative
always 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

The acceleration of a body due to the attraction of the Earth (radius R) at a distance 2R from the surface of the Earth is __________.

\(\frac{g}{9}\)
\(\frac{g}{3}\)
\(\frac{g}{4}\)
9

Water flows throw 2 identical tubes A & B, A volume V₀ of water posses throw the tube A & 2Vo throw B in a given time. Which of the following may be correct?

Flow in both the tubes are steady
Flow in both the tubes are turbulent
Flow is steady in A but turbulent in B
All the above

Water is flowing through a long horizontal tube. Let P_A & P_B be the pressure at two points A &B of the tube

P_A must be equal to P_B
P_A must be greater than P_B
P_A must be smaller than P_B
P_A =P_B only of the cross - sectional area at A & B are equal

Two spherical balls of mass 10hg are placed 10cm apart. Find gravitational force of attraction between them

the earth does not attract the objects in a satellite
the normal force by chair on the person balances the earth attraction
the normal force is zero
the person in sattelite is not accelerated

An object of mass 10 kg is hanging on a spring scale which is attached to the roof of a lift. If the lift is in free fall, the reading in the spring scale is

98 N
zero
49 N
9.8 N

A particle falls towards earth from infinity. It's velocity reaching the Earth would be _________

Cinfinity
\(\sqrt{2gR}\)
\(2\sqrt{gR}\)
Zero

Rockets are launched in eastward direction to take advantage of _________.

the clear sky on eastern side
Earth's rotation
the thinner atmosphere on this side
Earth's tilt

The kinetic energies of a planet in an elliptical orbit about the Sun, at positions A, B and C are K_A, K_B and K_C respectively. AC is the major axis and SB is perpendicular to AC at the position of the Sun S as shown in the figure. Then

K_A > K_B >K_C
K_B < K_A < K_C
K_A < K_B < K_C
K_B > K_A > K_C

The excess pressure inside a soap bubble is twice the excess pressure inside a second soap bubble, the volume of the first bubble is n times the volume of the second where n is

4
2
1
0.125

The magnitude of the Sun’s gravitational field as experienced by Earth is

same over the year
decreases in the month of January and increases in the month of July
decreases in the month of July and increases in the month of January
increases during day time and decreases during night time

If the Earth is at one-fourth of its present distance from the sun the duration of year will be:

half the present year
one-eight the present year
one-fourth the present year
one-sixth the present year

The value of g on the Earth surface is 980 cm/sec². Its value at a height of 64 km from the Earth surface is ________ cms^-2

960.40
984.90
982.45
977.55

Which of the following statement about the gravitational constant is true?

It is a force
It has same value in all system of unit
It has not unit
It depends on the value of the masses

Water rises in a vertical capillary tube upto a length of 10 cm if the tube is inclined at 45^o, the length of water risen will be

10cm
10\(\sqrt { 2 } \)cm
\(\frac { 10 }{ \sqrt { 2 } cm } \)
none of these

When a metal wire is stretched by a .load, the fractional change in its volume ΔV/V is proportional to

\(\frac { \triangle l }{ l } \)
\(\left( \frac { \triangle l }{ l } \right) ^{ 2 }\)
\(\sqrt { \frac { \triangle l }{ l } } \)
none of these

A liquid can easily change its shape but a solid can not because

the density of a liquid is smaller than that of a solid
the forces between the molecules is stronger in solid than in liquids
the atoms combine to form bigger molecules in a solid
the average separation between the molecules is larger in solids

The force of viscosity is

electro magnetic
gravitational
nuclear
weak

A satellite is moving around the Earth with speed v in a circular orbit of radius r. If the orbit radius is decreased by 1% its speed will _______.

increase by 1%
increase by 0.5%
decrease by 1%
decrease by 0.5%

The properties of a surface are different from those of the bulk liquid because the surface molecules are

are smaller than other molecules
acquire charge due to collision from airmolecules
find different type of molecules in their range of influence
feel a net force in different direction

A geostationary satellite orbits around the earth in a circular orbit of radius 3600 km the time period of a satellite orbiting a few hundred kilometers above the earth's surface (RE = 6400 km) will be approximately be _______ hours.

1/2
1
2
4

If a person moves from Chennai to Trichy, his weight

increases
decreases
remains same
increases and then decreases

If the masses of the Earth and Sun suddenly double, the gravitational force between them will

remain the same
increase 2 times
increase 4 times
decrease 2 times

The work done by the Sun’s gravitational force on the Earth is

always zero
always positive
can be positive or negative
always negative

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

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

What does not change in the field of central force?

Potential energy
kinetic energy
linear momentum
Angular momentum

When a capillary tube is dipped into a liquid the liquid neither rises nor falls in the capillary

the surface tension ofliquid must be zero
contact angle must be 90^o
surface tension may be one
contact angle may be 90° (or) zero

A planet moving along an elliptical orbit is closest to the Sun at distance r₁ and farthest away at a distance of r₂. If v₁ and v₂ are linear speeds at these points respectively. Then the ratio \({v_1\over v_2}\) is

\({r_2\over r_1}\)
\(({r_2\over r_1})^2\)
\({r_1\over r_2}\)
\(({r_1\over r_2})^2\)

When water droplets merge to form a bigger drop

energy is liberated
energy is absorbed
energy is neither liberated nor absorbed
energy may either be .liberated or abosorbed depending on the nature of the liquid

The contact angle between a solid & a liquid is a property of

the material of solid & liquid
material of container
shape of solid
mass of solid

If density of Earth increased 4 times and its radius becomes half of then out weight will be ________.

four times its present value
doubled
remains same
halved

The radius of orbit of a planet is two times that of Earth. The time period of planet is _________years.

4.2
2.8
5.6
8.4

A satellite is orbiting around the Earth in a circular orbit with velocity v. If m is the mass of the satellite, its total energy is_______.

mv²
\(\frac{1}{2}\)mv²
-\(\frac{1}{2}\)mv²
\(\frac{3}{4}\)mv²

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