Tag: physics

Questions Related to physics

1 light year is equal to 

  1. $\displaystyle 6.3\times { 10 }^{ 5 }\overset { o }{ A } $

  2. $\displaystyle 6.3\times { 10 }^{ 4 }$$AU$

  3. $\displaystyle 3.0\times { 10 }^{ 16 }{ ms }^{ -1 }$

  4. $\displaystyle 6.3\times { 10 }^{ 4 }\overset { o }{ A } $


Correct Option: B
Explanation:
We know that   $1 \ light year  = 9.46\times 10^{15} \ m$
Also,   $1 \ AU = 1.5\times 10^{11} \ m$
Thus   $1 \ light year  = \dfrac{9.46\times 10^{15}}{1.5\times 10^{11}}  \ AU= 6.3\times 10^4 \ AU$

Pound is the unit of ________ in the F.P.S. system.

  1. mass

  2. length

  3. time

  4. temperature


Correct Option: A
Explanation:

Pound is a unit of mass in the F.P.S. system.

1 parsec is equal to

  1. $\displaystyle 3.1\times { 10 }^{ 15 }m$

  2. $\displaystyle 3.1\times { 10 }^{ -15 }m$

  3. $\displaystyle 3.1\times { 10 }^{ 16 }m$

  4. $\displaystyle 3.1\times { 10 }^{ -16 }m$


Correct Option: C
Explanation:
Parsec is the unit of distance.
$1 \ $ parsec $ = 3.1\times 10^{16} \ m$

1 light year is equal to

  1. $\displaystyle 9.46\times { 10 }^{ -15 }m$

  2. $\displaystyle 9.46\times { 10 }^{ 15 }m$

  3. $\displaystyle 9.46\times { 10 }^{ -13 }m$

  4. $\displaystyle 9.46\times { 10 }^{ 13 }m$


Correct Option: B
Explanation:
One light-year is defined as the distance traveled by light in a vacuum in one year.

Number of seconds in 1 year is:
$1 year=365\times24\times\times60\times60\\=3.15\times10^7\ sec$

So,
$1 \ light \ year =3\times10^8\times3.15\times10^7\\= 9.46\times 10^{15} \ m$

1 AU is equal to

  1. $\displaystyle 1.5\times { 10 }^{ 11 }m$

  2. $\displaystyle 1.5\times { 10 }^{ 10 }m$

  3. $\displaystyle 1.5\times { 10 }^{ 9 }m$

  4. $\displaystyle 1.5\times { 10 }^{ -11 }m$


Correct Option: A
Explanation:
One astronomical unit is defined as the distance between the sun and the earth.
$ 1 \ AU = 1.5\times 10^{11} \ m$

1 ton =

  1. 100 kg

  2. 1000 kg

  3. 10 kg

  4. 10000 kg


Correct Option: B
Explanation:

$1\ quintal (qt) = 100\ kg$
$1\ tonne (t) = 1000\ kg$

The average distance between the earth and the sun is termed as a/an

  1. astronomical unit

  2. light year

  3. parallactic second

  4. none of these


Correct Option: A
Explanation:
One astronomical unit is defined as the average distance between the earth and the sun.
$1 \ AU = 1.5\times 10^{11} \ m$

The unit of length in the F.P.S. system is 

  1. foot

  2. pound

  3. metre

  4. none of these


Correct Option: A
Explanation:

Foot is the unit of length in the F.P.S. system.

Parsec is a unit of time.

  1. True

  2. False


Correct Option: B
Explanation:

Parsec is a unit of distance used in astronomy. $1\ Parsec $$=3.086\times 10^{13}\ km$

Thus, the given statement will be false.

How many light year away, the Sun is located from the galatic centre?

  1. 250

  2. 30,000

  3. 22.5

  4. 15,000


Correct Option: B
Explanation:

The sun is located 30,000 Light-years away from the galactic centre.