- Acm
- B$cm^{2}$
- ✓$cm^{-1}$
- D$cm^{-2}$
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A battery of e.m.f. 3 volt and internal resistance 1.0 ohm is connected in series with copper voltameter. The current flowing in the circuit is 1.5 amperes. The resistance of voltameter will be
|
(a) Zero |
(b) 1.0 ohm |
(c) 1.5 ohm |
(d) 2.0 ohm |
1 g of hydrogen is converted into 0.993 g of helium in a thermonuclear reaction. The energy released is
|
(a) 63 |
(b) 63 |
(c) 63 |
(d) 63 |
If 20 gm of a radioactive substance due to radioactive decay reduces to 10 gm in 4 minutes, then in what time 80 gm of the same substance will reduce to 10 gm
|
(a) In 8 minutes |
(b) In 12 minutes |
(c) In 16 minutes |
(d) In 20 minutes |
When the speed of electrons increases, then the value of its specific charge
|
(a) Increases |
|
(b) Decreases |
|
(c) Remains unchanged |
|
(d) Increases upto some velocity and then begins to decrease |
For which of the following colour, the magnifying power of a microscope will be maximum
|
(a) White colour |
(b) Red colour |
(c) Violet colour |
(d) Yellow colour |