Tag: universe and space

Quizzes (13) Questions (114)

Questions Related to universe and space

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

A force which produces an acceleration in a body equal to acceleration due to gravity on earth, when the body has a unit mass is called

  1. Gravitational unit of force

  2. Gravity force

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Definition of gravitational unit of force: A force which produces an acceleration in a body equal to acceleration due to gravity on earth, when the body has a unit mass is called gravitational unit of force.

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

Gravitational unit of force produce an acceleration in a body equal to 

  1. $g$
  2. $0$
  3. $2g$

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

Acceleration due to gravity is denoted by '$g$'.
A force which produces an acceleration in a body equal to acceleration due to gravity on earth, when the body has a unit mass is called gravitational unit of force.

Multiple choice physics universe and space heliocentric model introduction to gravitation introduction to gravity
State whether true or false.
The universal gravitational constant is independent of the intervening medium.

  1. True

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

Gravity is unipolar, attractive. So when it goes through a medium, there is no polarizing effect or polarizing forces. Thus the gravitational constant is independent of the intervening medium.

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

If the gravitational force of earth suddenly disappears, then which of the following is correct?

  1. weight of the body is zero

  2. mass of the body is zero

  3. both mass and weight become zero

  4. neither the weight nor the mass is zero
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mass = $m$

Acceleration due to gravity = $g$
Weight of a body is given by, $(W) = m\times g$
When gravitational force disappears $g$ becomes zero, but the mass remains the same.
So, $W = m\times g=m\times 0$ 
Hence, $W = 0$
Correct option will be $(A)$

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

The orbit of the earth is an ellipse is an and not a circle. The distance between earth sun thus varies. On January 3, earth is closet to the sun (Perihelion). Similarly, earth is said to be at Aphelion, when it is farthest from the sun on ________.

  1. March, 23

  2. July, 4

  3. December, 23

  4. April, 21
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Earth is about 147.1 million kilometres (91.4 million miles) from the Sun at perihelion around January 3, in contrast to about 152.1 million kilometres (94.5 million miles) at aphelion around July 4, a difference of about 5.0 million kilometres (3.1 million miles).