MEASUREMENT/UNIT

31. One micron is equal to - [39th B.P.S.C. (PRE)1994]

(a) 1/10mm
(b) 1/100mm
(c) 1/1000mm
(d) 1/10000mm

Correct Answer: (c) 1/1000mm

Solution:1 Micron =10⁻⁶
=10⁻⁶×10³mm
=1/10³mm
=1/1000mm.

32. One micron represent a length of - [U.P.P.C.S (Mains) 2011]

(a) 10⁻⁶ cm
(b) 10⁻⁴cm
(c) 1 mm
(d) 1 m

Correct Answer: (b) 10⁻⁴cm

Solution:One micron represents a length of 10⁻⁶ m. It is represented by µ sign
1 micron = 0.000001 m=0.0001 cm

33. Which one of the following is not correctly matched? [U.P.P.S.C.S.(SPL) (MAINS) 2004 ,U.P.P.S.C. (PRE) 2001]

List-1	List-2
Decibel	Unit of sound intensity
Horse	Unit of power
Nautical miles	Unit of naval distance
Celsius	Unit of heat

Correct Answer: d)

Solution:Celsius is a scale and unit of measurement for temperature. Heat is measured in calories. Nautical mile is measured the distance at sea and equal to 1.852 km. Horse power is measured by power, 1 horse power is equal to 746 watts. Decibel is used to measure the sound intensity.

34. Which one of the following is not the unit of heat? [M.P.P.S.C.S.(PRE)2016]

(a) Calorie
(b) Kilojoule
(c) Kilocalorie
(d) Watt

Correct Answer: (d) Watt

Solution:The watt is a derived unit of power in the international system of units ( SI). Rest of all are the units of heat.

35. Which one of the following is not the unit of heat? [U.P.R.O/A.R.O. (PRE)2017]

(a) Centigrade
(b) Calorie
(c) Joule
(d) Erg

Correct Answer: (a) Centigrade

Solution:The most commonly used scales temperature are Centigrade scale ,Fahrenheit scale and Kelvin scale. While the calorie ,erg and joule are the units of heat energy. Heat is a form of energy.

36. A distance of 1 km means - [45th B.P.S.C. (PRE) 2001]

(a) 100 m
(b) 1000 cm
(c) 1000 m
(d) 100 cm

Correct Answer: (c) 1000 m

Solution:The SI unit of distance is metre.

1 km is equal to 1000 m.

1 m equal to 100 cm.

37. One pikogram is equal to - [42th B.P.S.C. (PRE) 1997]

(a) 10⁻⁶ gram
(b) 10⁻ ¹⁵ gram
(c) 10⁻¹² gram
(d) 10⁻⁹ gram

Correct Answer: (c) 10⁻¹² gram

Solution:The smallest unit of measuring the mass are Pikogram, Femtogram, Milligram, Microgram.

1 pikogram is equal to 10⁻¹² gram.

38. Pascal is the unit of measuring : [Uttarakhand P.C.S. (PRE)2002]

(a) Humidity
(b) Pressure
(c) Rainfall
(d) Temperature

Correct Answer: (b) Pressure

Solution:The pascal is the unit of pressure in the international unit (SI).
1(Pa)=1newton/metre²=1kgm⁻¹s⁻².

39. What is the unit of pressure ? [64th B.P.S.C.(PRE) 2018]

(a) Newton/metre.sq
(b) Newton-metre
(c) Newton
(d) Newton/metre

Correct Answer: (a) Newton/metre.sq