Alternating Current — Physics STD 12 Science — Question

If A and B are two inputs in AND gate, then AND gate has an output of 1 when the values of A and B are

(a) A = 0, B = 0

(b) A = 1, B = 1

(c) A = 1, B = 0

(d) A = 0, B = 1

Two identical batteries, each of e.m.f. 2 volt and internal resistance 1.0 ohm are available to produce heat in an external resistance R = 0.5 ohm by passing a current through it. The maximum Joulean power that can be developed across R using these batteries is

(a) 1.28 watt

(b) 2.0 watt

(c)  watt

(d) 3.2 watt

When a thin mica sheet is placed between the plates of a condenser then the amount of charge, so compared to its previous value, on its plates will become:

Which one statement is correct ? A parallel plate air condenser is connected with a battery. Its charge, potential, electric field and energy are  and respectively. In order to fill the complete space between the plates a dielectric slab is inserted, the battery is still connected. Now the corresponding values Q, V, E  and U are in relation with the initially stated as 

(a) Q >

(b)

(c) V >

(d)

An oil flowing on water seems coloured due to interference. For observing this effect, the approximate thickness of the oil film should be

(a) 100 Å

(b) 10000 Å

(c) 1 mm

(d) 1 cm

Gravitational force has only on sign but coulomb force has:

A cube of a metal is given a positive charge Question: For this system, which of the following statements is true?