Name and symbol of the prefixes used with SI units to indicate multiplication by the following exact quantities 103, 10-2, 10-1 and 10-3 respectively are:
k, c, d, m
m, d, c, k
d, k, c, m
k, m, d, c
Average velocity =( 8RT of O2gas
(M
at 100C in m s-1 is:
(8x0.0821 x 10
32(
(8x8.314 x 10
32 (
(8 x 8.314 x 283
32(
(8x8314 x 283
32 (
Variation of concentration (in mol L-1) with time (in second) is given by:
(dx/dt) = k [A]n
where k is rate constant and n the order of the reaction. If n=2 then k is expressed in the unit of:
L mol-1 s-1
Mol L-1 s-1
L2 mol-2 s-1
s-1
x0 is the same is 0F and 0C. x0 is:
1800
-2730
-400
-320
The density of silver is 10.5 g/cm3. This value is kg/m3 would be:
1.05 x 104 kg/m3
10.5 x 104 kg/m3
1.05 x 103 kg/m3
10.5 x 102 kg/m3
Helium has the lowest boiling point of all the elements at –4520F. This value in degree celsius is:
-2190C
-1890C
-2690C
-2260C
The greatest length of the following group is:
4.0 m
140 in
12 ft
0.001 km
The highest temperature of the following group is:
217 K
273 K
2170F
1050C
The largest volume of the following group is that of:
445 g of water at 40C (density = ag/cm3)
600 g of chloroform at 200C (density=1.5g/cm3)
155 cm3 of steel
0.50 L milk
Rate law of a given equation of nth order
A ( Product
Is given by dx = k [A]n
dt
A straight line is inclined at 450 when a graph between log dx
dt
and og [A] is plotted. Hence, n is:
0
1
2
0.5
Consider following unit values of energy
A: 1 l atm B: 1 erg C: 1 joule
D: 1 kcal
Increasing order of thee values is:
A = B = C = D
A < B < D < D
B < C < A < D
D < A < C < B
The metric unit to measure volume is:
Litre
mL
m3
cm3
The abbreviation for the metric unit used to measure mass is:
k
m
g
s
The SI unit for volume is .. and the metric unit for volume is …
L, m3
m3, L
mL, m3
cm3, m3
Which of the following represents the largest unit?
Deciliter
Dekalitre
Kilolitre
Megalitre
Which measurement represents the largest quantity?
47.3 mg
4730 ng
4.73 x 10-4 g
4.73 x 103 (g
Which measurement represents the smallest quantity?
2950 ng
2.95 x 10-4 g
2.95 x 103 (g
2.95 x 10-6 kg
When the prefix milli is used in the metric or SI system, a fundamental unit of measurement is multiplied by what factor?
103
10-3
10-6
10-2
When the prefix centi is used in the metric system a fundamental unit of measurement is multiplied by what factor?
102
10-3
10-2
103
Which choice best describes the degree of uncertainty in the measurement 16.30 g?
The uncertainty cannot be determined without additional information
The quantity is exact
( 0.10 g
( 0.01 g
Which choice best describes the degree of uncertainty in the measurement 4.0032 g?
The uncertainty cannot be determined with additional information
The quantity is exact
The measurement is between 4.002 and 4.004 g
The measurement is between 4.0031 and 4.0033 g
What is 0.0970 written inn scientific notation?
970 x 10-4
97 x 10-3
9.70 x 10-2
97.0 x 10-2
If 75.0 g of water of 300C absorbs 900 calories, the new temperature will be:
42.00C
105.00C
70.00C
160.00C