Current Electricity — Physics STD 12 Science — Question

The tangent galvanometer, when connected in series with a standard resistance can be used as

(a) An ammeter	(b) A voltmeter
(c) A wattmeter	(d) Both an ammeter and a voltmeter

When a hydrogen bomb explodes, which of the following is used?

In Young's interference experiment, if the slits are of unequal width, then:

S.I. unit of power of a lens is :

Assertion :  If an electron is not deflected while passing through a certain region of space, then only possibility is that there is no magnetic region.

Reason    : Force is directly proportional to the magnetic field applied.

(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 assertion is false but reason is true.

The binding energy of deuteron  is 1.112 MeV per nucleon and an α - particle  has a binding energy of 7.047 MeV per nucleon. Then in the fusion reaction  the energy Q released is

(a) 1 MeV

(b) 11.9 MeV

(c) 23.8 MeV

(d) 931 MeV

An ammeter whose resistance is 180 Ω gives full scale deflection when current is 2 mA. The shunt required to convert it into an ammeter reading 20 mA (in ohms) is

(a) 18

(b) 20

(c) 0.1

(d) 10

Four plates of the same area of cross-section are joined as shown in the figure. The distance between each plate is d. The equivalent capacity across A and B will be

(a)

(b)

(c)

(d)

A nucleus  emits one α  and one β  particles. The resulting nucleus is

(a)

(b)

(c)

(d)