Tag: universe and space

Quizzes (13) Questions (114)

Questions Related to universe and space

Multiple choice physics universe and space xx radio telescope and space telescopes optical instruments : telescope

The Hubble Space Telescope is designed with ____________  hyperbolic mirrors is known for good imaging performance over a wide field of view. 

  1. two

  2. four

  3. three

  4. many
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hubble space telescope is reflecting telescope it is designed with TWO hyperbolic mirrors. A curved primary mirror is the basic optical element that creates an image at the focal plane. And secondary mirror was added to modify the optical characteristics for visual observation.

Multiple choice physics universe and space xx radio telescope and space telescopes optical instruments : telescope

Which among the following is not true for Hubble ST?

  1. Hubbles observations found that black holes are common to the centers of all galaxies.

  2. Hubble's Telescope was first to found the traces of water on Earth.

  3. Hubble Deep field and Hubble Ultra Deep Field images reveal galaxies that are billions of light-years away.

  4. Astronauts used the telescope to observe distant supernovae.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

We know that Earth has water, blue planet, 71% of Earth's surface is covered in water. Hubble telescope was definitely not the first to found the traces of water on Earth. 

Multiple choice physics universe and space heliocentric model introduction to gravitation introduction to gravity

Let $F _{1}$ be the magnitude of the gravitational force exerted on the Sun by Earth and $F _{2}$ be the magnitude of the force exerted on Earth by the Sun. Then.

  1. $F _{1}$ is much greater than $F _{2}$
  2. $F _{1}$ is slightly greater than $F _{2}$
  3. $F _{1}$ is equal to $F _{2}$
  4. $F _{1}$ is slightly less than $F _{2}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

According to Newton's Third Law of Motion, for every action, there is an equal and opposite reaction. Therefore, the gravitational force exerted by the Sun on the Earth is equal in magnitude to the force exerted by the Earth on the Sun.

Multiple choice physics universe and space heliocentric model introduction to gravitation introduction to gravity

------------ is the force of attraction between any two bodies in the universe.

  1. Gravitation

  2. Polarity

  3. Induction

  4. Joule
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Any two objects attract each other with a force $F _g=\dfrac{GMm}{R^2}$ where $G$ is the gravitational constant, $M$ and $m$ the masses of the two bodies and $R$ is the distance along the line joining their centre of mass

Multiple choice physics universe and space heliocentric model introduction to gravitation introduction to gravity

State whether the given statement is True or False :

All objects attract each other along the line joining their centre of mass.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Any two objects attract each other with a force $F _g=\dfrac{GMm}{R^2}$ where $G$ is the gravitational constant, $M$ and $m$ the masses of the two bodies and $R$ is the distance along the line joining their centre of mass

Multiple choice physics universe and space heliocentric model introduction to gravitation introduction to gravity

The horizontal component of the weight of a body of mass $m$ is

  1. $mg$
  2. $\displaystyle \dfrac{\mathrm{m}\mathrm{g}}{2}$
  3. $0$

  4. Infinity
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The force of gravity is the force with which the earth, moon, or other massively large object attracts another object towards itself. By definition, this is the weight of the object. All objects upon earth experience a force of gravity that is directed "downward" towards the center of the earth. So, the horizontal component of the weight of body of mass $m$ will be $0$. $Option$ $C$ is correct.

Multiple choice physics universe and space heliocentric model introduction to gravitation introduction to gravity

An Earth's satellite is moving in a circular orbit with a uniform speed $v$. If the gravitational force of the Earth suddenly disappears, the satellite will

  1. vanish into outer space.
  2. continue to move with velocity $v$ in original orbit.

  3. fall down with increasing velocity.
  4. fly off tangentially from the orbit with velocity $v$.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The satellite revolves around the Earth in a circular orbit when centrifugal force acting outward on the satellite is balanced by the gravitational force of the Earth. Thus, when gravitational force suddenly disappears, then only centrifugal force will be acting and velocity is tangential to the orbit and hence, the satellite will fly off tangentially. It is similar to an object tied with a string, fly off when string suddenly breaks.