D.
12.67 m
3
E.
Cannot be determined
Correct Answer: A
Explanation:
This question can be solved by applying Charles’s law, which is given as
V
1
/ T
1
= V
2
/ T
2
-------------- (1)
Putting the values in equation 1 we get
10/313 = V
2
/373
V
2
= 11.92 m
3
Therefore, A is the correct answer option.
Question 11
What is the dipole moment between an electron and a proton separated by a distance of 1 nm?
A.
3.8 × 10
-28
Cm
B.
4.5 × 10
-28
Cm
C.
4.5 × 10
-26
Cm
D.
1.6 × 10
-28
Cm
E.
3.2 × 10
-28
Cm
Correct Answer: D
Explanation:
Electric dipole moment between two charges of opposite polarity is given as
p = Qd ----------- (1)
The distance is in nm so we need to convert it into m.
1 nm = 10
-9
m
Putting the values in equation 1 we get
P = 1.6 × 10
-19
× 10
-9
Or, 1.6 × 10
-28
Cm
Hence, D is the correct answer option.
Question 12
For a conductor having a cross section of 2 × 10
-4
m
2
, average drift velocity of the electrons
flowing through it is 10
-3
m/s . If the density of free electrons in the conductor is 6 × 10
-24
m
-3
,
what is the current flowing through the conductor? (Charge on electron = 1.6 × 10
-19
C)
A.
0.45 A
B.
0.045 A
C.
0.27 A
D.
0.31 A
E.
0.19 A
