MEASUREMENT/UNIT

Total Questions: 52

21. Megawatt is the measuring unit of power which is - [U.P.Lower Sub.(pre)1998]

(a) Generated
(b) Consumed
(c) Saved
(d) Lost in transmission

Correct Answer: (a) Generated

Solution:Megawatt is the measuring unit of power, which is generated in power station or power plant.

1 Megawatt is equal to 10⁶ (1 million) watt.

22. Match List-1 with List-2 and select the correct answer from the code given below : [U.P.P.S.C. (PRE)2005, U.P.U.D.A./L.D.A(PRE)2001]

List-1	List-2
Acceleration	Joule
Force	Newton per second
Work done	Newton
Impulse	Metre/seconds²

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

Correct Answer: (d)

Solution:Acceleration is the rate of change of velocity of an object, with respect to time. The SI unit of acceleration is metre per second square (m/s²). Unit of force is Newton (N).Unit of impulse is newton metre (Nm).Unit of work is joule.

23. Which of one of the following SI unit is not correctly matched? [U.P.Lower Sub.(pre)2013]

(a) Work-Joule
(b) Mass-kg
(c) Force-newton
(d) Pressure-Dyne

Correct Answer: (d) Pressure-Dyne

Solution:Pascal is the unit of of pressure or stress in the international system of the units(SI).

Dyne is the unit of force in CGS System.

24. Match List-1 with List-2 and select the correct answer using the codes given below : [U.P.U.D.A/L.D.A. (PRE)2002]

List-1(Units)	List-2(Parametric quantities)
A. Watt	1. Heat
B. Knot	2. Navigation
C. Nautical mile	3. Speed of ship
D. Calorie	4. Power

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

Correct Answer: (c)

Solution:

The unit of power is watt, which is equal to one joule per second.
Knot is the unit of measuring of speed of a ship.
Nautical mile is unit of distance used by navigators in the sea.
Calorie is unit of heat and energy. Thus option (c) correctly matched.

25. Match the following : [U.P.P.C.S.(PRE)1990]

List-1	List-2
joule	current
Ampere	power
Watt	work
Volt	electric potential

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

Correct Answer: a)

Solution:Joule is the unit work. Ampere, watt and volt are the units of current ,power and electric potential respectively.

26. How many watt are there in a horsepower? [M.P.P.SC.S]

(a) 1000w
(b) 750w
(c) 746w
(c) 748w

Correct Answer: (c) 746w

Solution:Horsepower is the unit of measurement of power( the rate at which work is done)
1 watt=1 joule
1 Horse power =746 watt

27. Which one is the following is not correctly matched [U.P.P.S.C.(Mains)2010]

(a) Angstrom - unit of wavelength of light.
(b) Nautical mile - unit of distance used in navigation.
(c) Knot - measure of speed of ship.
(d) Light year - unit of measurement of time.

Correct Answer: (d) Light year - unit of measurement of time.

Solution:Light year is not a unit of measurement of time, but a unit of measuring the distance.The remaining pairs are correctly matched.

28. Angstrom is a unit of : [64th B.P.C.S. (PRE)2018]

(a) wavelength
(b) frequency
(c) energy
(d) velocity

Correct Answer: (a) wavelength

Solution:Angstrom is the unit of length used in mainly in measuring the wavelength of electromagnetic wave which is equal to 10⁻¹⁰ metre or 0.1 nanometre.

29. Match List-1 with List-2 and select the correct answer using the following code given below in the lists: [U.P.P.S.C (PRE)2006, I.A.S.(PRE)1999]

List-1	List-2
High speed	mach
wavelength	angstrom
pressure	pascal
energy	joule

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