- A$ML ^2 T^{-3} A^{-2}$
- B$M ^2 LT ^{-2} A^{-2}$
- C$M ^0 L^2 T^{-3} A^{-2}$
- ✓$ML ^2 T^{-2} A^{-2}$
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In Millikan's oil drop experiment an oil drop carrying a charge Q is held stationary by a potential difference 2400 V between the plates. To keep a drop of half the radius stationary the potential difference had to be made 600 V. What is the charge on the second drop
|
(a) |
(b) |
(c) Q |
(d) |
$\text{f}=\frac{\text{R}}{2}$
$\text{f}=\text{R}$
$\text{f}=-\text{R}$
$\text{f}=2\text{R}$
In the circuit shown here, E1 = E2 = E3 = 2 V and R1 = R2 = 4 ohms. The current flowing between points A and B through battery E2 is
|
(a) Zero |
(b) 2 amp from A to B |
|
(c) 2 amp from B to A |
(d) None of the above |
The count rate of 10g of radioactive material was measured at different times and this has been shown in the figure. The half life of material and the total counts (approximately) in the first half life period, respectively are

|
(a) 4h, 9000 |
(b) 3h, 14000 |
(c) 3h, 235 |
(d) 3h, 50 |
A hot electric iron has a resistance of 80 Ω and is used on a 200 V source. The electrical energy spent, if it is used for two hours, will be
|
(a) 8000 Wh |
(b) 2000 Wh |
(c) 1000 Wh |
(d) 800 Wh |
The graph between wave number (
) and angular frequency (w) is
|
(a)
|
(b)
|
(c)
|
(d)
|
Fermi level of energy of an intrinsic semiconductor lies
|
(a) In the middle of forbidden gap |
(b) Below the middle of forbidden gap |
|
(c) Above the middle of forbidden gap |
(d) Outside the forbidden gap |