Satellite Launch Vehicle and Jounney to PSLV

Q.

Calculate the force of gravitation between the earth and the Sun, given that the mass of the earth $=6\times {10}^{24}\mathrm{kg}$ and of the Sun $=2\times {10}^{30}\mathrm{kg}$. The average distance between the two is $1.5\times {10}^{11}\mathrm{m}$.

Q.

Two bodies of masses $\mathrm{m}$ and $4\mathrm{m}$ are placed at a distance of $\mathrm{r}$. The gravitational potential at a point on the line joining them where the gravitational field is zero is

1. $-\frac{4\mathrm{Gm}}{\mathrm{r}}$

2. $-\frac{6\mathrm{Gm}}{\mathrm{r}}$

3. $-\frac{9\mathrm{Gm}}{\mathrm{r}}$

4. Zero

Q.

A geostationary satellite is orbiting the earth at a height of $6R$ above the surface of the earth, $R$ being the radius of the earth. What will be the time period of another satellite at a height $2.5R$ from the surface of the earth?

1. $6\sqrt{2}h$

2. $6\sqrt{2.5}h$

3. $6\sqrt{3}h$

4. $12h$

Q.

A geostationary satellite is orbiting around an arbitrary planet ‘$P$’ at a height of $11R$ above the surface of ‘$P$’, $R$ being the radius of ‘$P$’. The time period of another satellite in hours at a height of $2R$ from the surface of ‘$P$’ is _____. ‘$P$’ has a time period of rotation of $24hours$.

1. $6\sqrt{2}h$

2. $3h$

3. $5h$

4. $6\sqrt{3}h$

Q.

What is the importance of the universal law of gravitation?

Q.

The acceleration due to gravity at the surface of the moon is 1.67 $\frac{m}{{sec}^2}$. If the radius of the moon is 1.74 $\times$ ${10}^6$ m. Find the mass of the moon. ( Given: G = 6.67 $\times$ ${10}^{-11}$ $\frac{N{m}^2}{{kg}^2}$)

Q.

Two bodies A and B of masses of 1 kg and 2 kg, respectively, are dropped near the earths surface. Let the acceleration of A and B be a₁ and a_2, respectively, then

1. $a_1=a_2$

2. $a_1<a_2$

3. $a_1>a_2$

4. $a_1\ne a_2$

Q. Find the escape velocity on the surface of the moon, if the mass and radius of the moon are $7.34\times {10}^{22}kg$ and $1.74\times {10}^{6}m$ respectively.

1. 2.37

Q.

How do you measure the weight of an object?

Q.

Which fuel is used in rocket propulsion?

Q.

Escape velocity does not depend on ________ .

Q. Why is it difficult to shoot a fish swimming in water ?

Q.

How does the weight of an object change as one goes from the equator to the north pole of the earth?

Q.

Law of gravitation gives the gravitational force between

1. the earth and a point mass only

2. the earth and Sun only

3. any two bodies having some mass

4. two charged bodies only

Q.

Which of the following is mainly used as rocket fuel?

1. Liquid nitrogen

2. Liquid hydrogen

3. Liquid helium

4. Liquid chlorine

Q.

What is the value of escape velocity of the Earth?

1. $11.2m/s$

2. $1000km/s$

3. $0m/s$

4. $11.2km/s$

Q.

What force must be applied to a body through a distance of $10m$, such that it does a work of $4000J$? If the mass of the body is $20kg$, what is the acceleration of the body?

Q.

What is the mass of an object whose weight is 196 N?

Q.

You buy a bag of sugar of weight W at a place on the equator. You take this to Antarctica. Would its weight be the same there? If not, would it increase or decrease? why?

Q.

Weight of an object is 100 newton. Calculate the mass of an object? $\left(g=10m/s^2\right)$

Q. Indian Space Research Organisation (ISRO) was formed in the year.

1. 1957
2. 1964
3. 1969
4. 1972

Q.

Newtons Law of Universal gravitation is valid only on the earth.

1. True
2. False

Q.

Two satellites are orbiting around the earth in circular orbits of the same radii. One of them is $10\mathrm{times}$ greater in mass than the other. Their period of revolutions are in the ratio:

1. 1:100

2. 100:1

3. 1:10

4. 1:1

Q.

The minimum speed needed for an object to escape from the gravitational influence of the earth is:

1. Orbital velocity

2. Escape velocity

3. $v_e=\sqrt{\frac{2gM}{R}}$

4. $v_0=\sqrt{\frac{gM}{R}}$

Q. State one factor on which the magnitude of a non- contact force depends. How does it depend on the factor stated by you?

Q.

Calculate the value of gravitational force between two objects of mass of 40 kg each, separated by a distance of 0.4 m. Take G = 6.7 x 10^-11 Nm² kg^-2.

Q.

State Einsteins mass-energy equivalence relation.

Q.

A stone and a piece of paper are dropped simultaneously from the first floor of a building. Which of the two reaches the ground earlier, and why?

Q. State the universal law of gravitation. Write the mathematical expression of this law.

Q.

Which satellite is used specifically for managing the natural resources of the nation?

1. EDUSAT

2. INSAT

3. IRS

4. GSAT