Wave Optics — Physics STD 12 Science — Question

Which of the following quantities do not change when a resistor connected to a battery is heated due to the current?

In the series combination of two or more than two resistances:

The earth’s magnetic field always has a vertical component except at the:

Two parallel conductors A and B of equal lengths carry currents I and 10 I, respectively, in the same direction. Then(a) A and B will repel each other with same force(b) A and B will attract each other with same force(c) A will attract B, but B will repel A(d) A and B will attract each other with different forces

A step up transformer has transformation ration 5 : 3. What is voltage in secondary if voltage in primary is 60 V(a) 20 V(b) 60 V(c) 100 V(d) 180 V

Assertion  :   A direct current flows through a metallic rod, produced magnetic field only outside the rod.
Reason     : There is no flow of charge carriers inside the rod.(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.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.

The energy band gap is maximum in (a) Metals(b) Superconductors(c) Insulators(d) Semiconductors

If eight identical drops are joined to form a bigger drop, the potential on bigger as compared to that on smaller drop will be(a) Double(b) Four times(c) Eight times(d) One time