MEASUREMENT/UNIT

41. What is the unit of atmospheric pressure? [Chhattisgarh P.C.S.(PRE) 2008]

(a) Bar
(b) Knot
(c) Ohm
(d) Joule

Correct Answer: (a) Bar

Solution:Bar is metric but not SI unit of pressure. It is equal to 10⁵ newton/metre². Pascal is the SI unit of pressure.1 bar =10⁵ pascal.

42. 1 kg/cm² pressure is equivalent to : [Uttarakhand P.C.S (PRE) 2002]

(a) 0.1 bar
(b) 1.0 bar
(c) 100.0 bar
(d) 10.0 bar

Correct Answer: (b) 1.0 bar

Solution:In this question 1 kg/cm² refer to 1 kgf/cm²
1 dyne =1.02×10⁻⁶kgf
and 1 bar=10⁶ dyne/cm²
By substituting the value we get
1 bar=10⁶ dyne/cm²=1.02×10⁻⁶×10⁶ kgf/cm²=1.02 kgf/cm².

43. Which one of the following quantities does not have the unit? [65th B.P.S.C. (PRE) 2019]

(a) Stress
(b) Force
(c) Strain
(d) Pressure

Correct Answer: (c) Strain

Solution:

Strain is a dimensionless quantity. It is defined as the ratio of the change in length (or volume or shape) to the original length (or volume or shape). Since it's a ratio of two quantities with the same units, the units cancel out.

44. 1 barrel of oil equals to which of the following ? [U.P.P.S.C. (PRE)2009]

(a) 201 litre
(b) 159 litre
(c) 131 litre
(d) 179 litre

Correct Answer: (b) 159 litre

Solution:The amount of oil is measured in cubic metres.
1 barrel=158.9873 litre
1 barrel=0.158987 cubic metre
1 barrel=42 U.S. gallon
1 barrel=34.9723 U.K. gallons

45. The smallest unit of length is - [U.P.P.S.C. (PRE)2005]

(a) Nanometre
(b) Micron
(c) Angstrom
(d) Fermimetre

Correct Answer: (d) Fermimetre

Solution:1 Fermimetre =10⁻¹⁵m
1 Nanometre =10⁻⁹m
1 Angstrom =10⁻¹⁰m
1 Micron =10⁻⁶m

46. Match List-1 with List-2 and select the correct answer from the code given below : [U.P. Lower Sub.(spl) (pre)2008]

List-1	List-2
Cusec	pressure
Byte	Intensity of earthquake
Richer	Rate of flow
Bar	computer

-	A	B	C	D
a)	1	2	3	4
b)	3	4	2	1
c)	4	3	2	1
d)	3	4	1	2

Correct Answer: (b)

Solution:Cusec is the measure of flow of rate of water and its abbreviation of cubic feet per second (28.317 litres per second). Byte is a unit of digital information in computing and communications that consists of right bits. The Richter magnitude scale assigns a magnitude number to qualify the energy released by an earthquake.

47. What is measured in cusec ? [Uttarakhand P.C.S. (PRE) 2006]

(a) Purity of water
(b) Depth of water
(c) Flow of water
(d) Quantity of water

Correct Answer: (c) Flow of water

Solution:Cusec is the measure of flow of rate of water and its abbreviation of cubic feet per second (28.317 litres per second).

48. NTU is the unit for measuring : [Rajasthan P.C.S. (PRE) 2023]

(a) Pressure of water
(b) Temperature of water
(c) Acidity of water
(d) Turbidity of water

Correct Answer: (d) Turbidity of water

Solution:

Turbidity is described as the opaqueness of a fluid due to the presence of suspended solids and is measured in terms of nephelometric turbidity unit (NTC).The higher the concentration of suspended solids in the water is the dirtier it looks and the higher the turbidity is.

49. Which one of the following is the unit of measure of the thickness of the ozone layer of the atmosphere ? [Uttarakhand P.C.S. (PRE) 2010]

(a) Knot
(b) Dobson
(c) Maxewell
(d) Poise

Correct Answer: (b) Dobson

Solution:Ozone layer thickness is expressed in terms of Dobson units which is measure what is physical thickness would be if compressed in earth atmosphere. 1 Dobson unit is defined to be 0.01 mm thickness at STP (standard temperature and pressure) . The unit is named after G.M.B Dobson , one of the first scientist to investigate atmospheric ozone. 1 Dobson is equal to 2.687×10²⁰ molecules of ozone per square metre.

50. The thickness of the ozone layer in a column of air from the ground to the top of the atmosphere is measured in the terms of : [Chhattisgarh P.C.S.(PRE) 2023]

(a) Ozone unit
(b) Thomson unit
(c) Dobson unit
(d) None of the above

Correct Answer: (c) Dobson unit

Solution:

Ozone layer thickness is expressed in terms of Dobson units which is measure what is physical thickness would be if compressed in earth atmosphere. 1 Dobson unit is defined to be 0.01 mm thickness at STP (standard temperature and pressure) . The unit is named after G.M.B Dobson , one of the first scientist to investigate atmospheric ozone. 1 Dobson is equal to 2.687×10²⁰ molecules of ozone per square metre.

MEASUREMENT/UNIT

41. What is the unit of atmospheric pressure? [Chhattisgarh P.C.S.(PRE) 2008]

42. 1 kg/cm² pressure is equivalent to : [Uttarakhand P.C.S (PRE) 2002]

43. Which one of the following quantities does not have the unit? [65th B.P.S.C. (PRE) 2019]

44. 1 barrel of oil equals to which of the following ? [U.P.P.S.C. (PRE)2009]

45. The smallest unit of length is - [U.P.P.S.C. (PRE)2005]

46. Match List-1 with List-2 and select the correct answer from the code given below : [U.P. Lower Sub.(spl) (pre)2008]

47. What is measured in cusec ? [Uttarakhand P.C.S. (PRE) 2006]

48. NTU is the unit for measuring : [Rajasthan P.C.S. (PRE) 2023]

49. Which one of the following is the unit of measure of the thickness of the ozone layer of the atmosphere ? [Uttarakhand P.C.S. (PRE) 2010]

50. The thickness of the ozone layer in a column of air from the ground to the top of the atmosphere is measured in the terms of : [Chhattisgarh P.C.S.(PRE) 2023]

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