Question

One carat is equal to _______________
1. 300 × 10 ^{- 3} gm
2. 400 × 10 ^{- 3} gm
3. 200  × 10 - 3 gm
4. 250  × 10 - 3 gm

Answer 1

Correct Answer - Option 3 : 200  × 10 - 3 gm

• Carat is a unit for the measurement of the weight of gemstones. 
• 1 Carat is equal to 1/5 of a gram or 0.200 grams.
•  5 carat = 1gm

 This explains 1 carat is equal to 200  × 10 - 3 gm

Some quantities are used in daily life.

QUANTITY NAME	SYMBOL	VALUES IN SI UNIT
Minute	min	60 s
Hour	hr	60 min = 3600 s
Day	d	24 hr = 86400 s
Year	y	365.25 d = 3.165 x 107 s
Degree	º	1º = (\(\Pi \)/180) rad
Litre	L	1 dm3 = 10-3 m3
Tonne	t	103 kg
Bar	c	0.1 MPa = 105 Pa
Curie	bar	3.7 x 1010 s-1
Roentgen	Ci	2.58 x 10-4 C/kg
Quintal	R	100 kg
Barn	b	10 fm2 = 10-28 m2
Acre	a	1 dam2 = 102 m2
Hector	ha	1 hm2 = 104 m2
Standard Atmospheric Pressure	atm	1.013 x 105 pa