Consider the circuits shown in the figure. Both the circuits are taking same current from battery but current through R in the second circuit is 
th of current through R in the first circuit. If R is 11 W, the value of R1
|
(a) 9.9 W |
(b) 11 W |
(c) 8.8 W |
(d) 7.7 W |
(a) 9.9 W
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20 μA current flows for 30 seconds in a wire, transfer of charge will be
|
(a) 2 |
(b) 4 |
(c) 6 |
(d) 8 |
If the distance between parallel plates of a capacitor is halved and dielectric constant is doubled then the capacitance
|
(a) Decreases two times |
(b) Increases two times |
|
(c) Increases four times |
(d) Remain the same |
A LC circuit is in the state of resonance. If C = 0.1μF and L = 0.25 henry. Neglecting ohmic resistance of circuit what is the frequency of oscillations
|
(a) 1007 Hz |
(b) 100 Hz |
(c) 109 Hz |
(d) 500 Hz |
A manufacturer uses a concave lens instead of a convex lens in a magnifying glass by mistake. What will be the effect on the working of the lens?
In N-type semiconductors, majority charge carriers are
|
(a) Holes |
(b) Protons |
(c) Neutrons |
(d) Electrons |
Which of the following has negative temperature coefficient of resistance
|
(a) Copper |
(b) Aluminium |
(c) Iron |
(d) Germanium |
A hydrogen like atom of atomic number Z is in an excited state of quantum number 2n. It can emit a maximum energy photon of 204 eV. If it makes a transition to quantum state n, a photon of energy 40.8 eV is emitted. The value of n will be
|
(a) 1 |
(b) 2 |
(c) 3 |
(d) 4 |
If a glass prism is dipped in water, its dispersive power:
