MEASUREMENT/UNIT

11. Light year is the unit of _ [U.P.U.D.A /L.D.A. (PRE) 2013 ,R.A.S/R.T.S (PRE)1997 ,M.P.P.C.S.(PRE) 2008 ,Jharkhand P.C.S. (PRE)2013,2023,66th B.P.S.C.(PRE)2020]

(a) Distance
(b) Time
(c) Speed of light
(d) Intensity of light

Correct Answer: (a) Distance

Solution:Light year is a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.46×10¹⁵ meters.

12. A light year is the - [U.P.Lower Sub.(mains)2013]

(a) Year which had maximum sunlight.
(b) Year which have workload was very low.
(c) Distance travelled by the light in one year.
(d) Mean distance between Sun and Earth.

Correct Answer: (c) Distance travelled by the light in one year.

Solution:Light year is a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.46×10¹⁵ meters.

13. Light year is - [U.P.U.D.A./L.D.A.(PRE)2010]

(a) Year which have February has 29 days.
(b) The distance travelled by light in one year.
(c) The time which sun rays take to reach the Earth.
(d) The time in which a spacecraft reaches moon from the earth.

Correct Answer: (b) The distance travelled by light in one year.

Solution:Light year is a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.46×10¹⁵ meters.

14. Which one of the following is a reason why astronomical distance are measured in light year? [I.A.S.(PRE)2021]

(a) Distance among stellar bodies do not change.
(b) Gravity of stellar bodies does not change.
(c) Light always travels in straight line.
(d) Speed of light is always is same .

Correct Answer: (d) Speed of light is always is same .

Solution:A light year is the distance a beam of light travels in a single earth year. The speed of light is constant in a vacuum. And that is where all the stellar bodies are present in a vacuum. The speed of light is constant throughout the universe and is known to high precision. That is why all astronomical distances are measured in light-year.

15. A parsec, a unit of distance used to measure the distance related to the stars in the sky, is equal to - [R.A.S/R.T.S.(PRE)1999]

(a) 4.25 light years
(b) 3.25 light years
(c) 3.05 light years
(d) 4.50 light years

Correct Answer: (b) 3.25 light years

Solution:A parsec is a unit of length used to measure the astronomical large distance of object beyond our solar system.
1 parsec=3.0857×10¹⁶m
1 Light year=9.461×10¹⁵m
so 1 parsec=3.262 light year
only b is close to the exact answer

16. PARSEC is the unit of : [U.P.P.C.S.(PRE)1997]

(a) Distance
(b) Time
(c) Light intensity
(d) Magnetic force

Correct Answer: (a) Distance

Solution:

A parsec is a unit of length used to measure the astronomical large distance of object beyond our solar system.
1 parsec=3.0857×10¹⁶m.

17. Which unit of measurement is multiplied by 0.39 to convert it to 'inches'? [U.P.U.D.A/L.D.A.(PRE)2010]

(a) Milimetre
(b) Centimetre
(c) Metre
(d) Decimetre

Correct Answer: (b) Centimetre

Solution:1 Centimetre=0.39 inch, so we can multiply centimetre by 0.39 to convert it to inches.

18. How can the height of a person who is 6 feet tall, be expressed in nanometre? [I.A.S.(PRE)2008]

(a) 234×10⁶nm
(b) 183×10⁶nm
(c) 183×10⁷nm
(d) 181×10⁷nm

Correct Answer: (c) 183×10⁷nm

Solution:1 nanometre =10⁻⁹m
1 feet=0.305 metre
1 feet=30.5×10⁷nm
1 feet=6×30.5×10⁷nm=183×10⁷nm

19. One nanometre is equal to - [U.P.U.D.A/L.D.A.(PRE)2013, Uttrakhand P.C.S.(PRE)2016]

(a) 10⁻⁶cm
(b) 10⁻⁷cm
(c) 10⁻⁸cm
(d) 10⁻⁹cm

Correct Answer: (b) 10⁻⁷cm

Solution:1 Nanometre=1.0×10⁻⁹m
since 1 metre = 100 cm
so 10⁻⁹m=100×10⁻⁹cm=10⁻⁷cm

20. Ampere is the unit of - [Chhattisgarh P.C.S.(pre)2005]

(a) Power
(b) Electric current
(c) Voltage
(d) Resistance

Correct Answer: (b) Electric current

Solution:Ampere is the SI unit to measure the electric current. If one ampere current is flowing in any conducting device wire, it means 6.25×10¹⁸ electrons are entering per second from one direction and same amount of current flows from the other end per second.

MEASUREMENT/UNIT

11. Light year is the unit of _ [U.P.U.D.A /L.D.A. (PRE) 2013 ,R.A.S/R.T.S (PRE)1997 ,M.P.P.C.S.(PRE) 2008 ,Jharkhand P.C.S. (PRE)2013,2023,66th B.P.S.C.(PRE)2020]

12. A light year is the - [U.P.Lower Sub.(mains)2013]

13. Light year is - [U.P.U.D.A./L.D.A.(PRE)2010]

14. Which one of the following is a reason why astronomical distance are measured in light year? [I.A.S.(PRE)2021]

15. A parsec, a unit of distance used to measure the distance related to the stars in the sky, is equal to - [R.A.S/R.T.S.(PRE)1999]

16. PARSEC is the unit of : [U.P.P.C.S.(PRE)1997]

17. Which unit of measurement is multiplied by 0.39 to convert it to 'inches'? [U.P.U.D.A/L.D.A.(PRE)2010]

18. How can the height of a person who is 6 feet tall, be expressed in nanometre? [I.A.S.(PRE)2008]

19. One nanometre is equal to - [U.P.U.D.A/L.D.A.(PRE)2013, Uttrakhand P.C.S.(PRE)2016]

20. Ampere is the unit of - [Chhattisgarh P.C.S.(pre)2005]

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