Atoms — Physics STD 12 Science — Question

An electric dipole placed in a non-uniform electric field can experience

Which of the following gates will have an output of 1

(a) (a)

(b)

(c)

(d)

A 5.0 amp current is setup in an external circuit by a 6.0 volt storage battery for 6.0 minutes. The chemical energy of the battery is reduced by

(a) 1.08 × 104 J

(b) 1.08 × 10-4 volt

(c) 1.8 × 104 J

(d) 1.8 × 104 volt

NPN transistor are preferred to PNP transistor because they have

(a) Low cost

(b) Low dissipation energy

(c) Capability of handing large power

(d) Electrons having high mobility than holes

A potential difference of 2V is applied between the opposite faces of a Ge crystal plate of area 1 cm² and thickness 0.5 mm. If the concentration of electrons in Ge is 2 × 10¹⁹/m³ and mobilities of electrons and holes are 0.36   and 0.14   respectively, then the current flowing through the plate will be

(a) 0.25 A

(b) 0.45 A

(c) 0.56 A

(d) 0.64 A

The inability of a lens to bring all the rays coming from a point object to focus at one single point is called:

When a hole is produced in P-type semiconductor, there is:

Retina of eye acts like ........ of camera

(a) Shutter

(b) Film

(c) Lens

(d) None of these

Consider a capacitor-charging circuit. Let Q₁ be the charge given to the capacitor in a time interval of 10ms and Q₂ be the charge given in the next time interval of 10ms. Let 10mC charge be deposited in time interval t₁ and another 10mC charge be deposited in the next time interval t₂.