- AThe total charge of the universe is constant.
- BThe total positive charge of the universe is constant.
- CThe total negative charge of the universe is constant.
- DThe total number of charged particles in the universe is constant.
The total charge of the universe is constant.
Explanation:
The total charge (Positive + negative) oif the universe is constant.
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In circuit shown below, the resistances are given in ohms and the battery is assumed ideal with emf equal to 3 volt. The voltage across the resistance R4 is
|
(a) 0.4 V |
(b) 0.6 V |
(c) 1.2 V |
(d) 1.5 V |
A long wire AB is placed on a table. Another wire PQ of mass 1.0 g and length 50 cm is set to slide on two rails PS and QR. A current of 50A is passed through the wires. At what distance above AB, will the wire PQ be in equilibrium

|
(a) 25 mm |
(b) 50 mm |
(c) 75 mm |
(d) 100 mm |
In P-N junction, the barrier potential offers resistance to
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(a) Free electrons in N region and holes in P region |
|
(b) Free electrons in P region and holes in N region |
|
(c) Only free electrons in N region |
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(d) Only holes in P region |
The voltage V and current I graph for a conductor at two different temperatures and
are shown in the figure. The relation between
and
is
|
(a) |
(b) |
(c) |
(d) |
Assertion : To protect any instrument from external magnetic field, it is put inside an iron body.
Reason : Iron is a magnetic substance.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Which radiation in sunlight, causes heating effect
|
(a) Ultraviolet |
(b) Infrared |
(c) Visible light |
(d) All of these |