Mcqs

Plz answer
1) A slab of certain dielectric is placed b/w two oppositely charged metal plates .Choose the correct option from the following :
A)the intensity of electric field between plates increases
B)The intensity b/w the plates descrease
C)the intensity b/w them become zero
D) none of these

2)PN junction diode works as a insulator if connected :

A)To AC source
B)In forward bias
C)In reverse Bias
D)Nobel of these

3) in treating localization cancerous tumor,we used a narrow beam of :
A)laser from Cobalt 60
B)alpha Ray's from Cobalt 60
C)Beta Ray's from Cobalt 60
D)Gamma Rays from Cobalt 60

4)The ratio between molar specific heat and common specific heat is equal to :
A)molar gas constant B) Avogadro's number C)Bolzmen constant D) Molecular weight

5) Negative space rate of variation of potential at a point is called
A) potential gradient
B) Potential difference
C) Electric intensity
D) Electric flux
I think it is potential gradient but plz confirm

6))An alternating current changes its direction ________times in Pakistan
A)0 B)25 C)50 D)100

7)Minimum work is done in
A)Isochoric B)Isoberic C) Isothermal D) Adiabatic

I think it is Isochoric because in it no. Work is done but plz confirm

8)Non inductive winding is used in :
ATransformer B)Toroid C)PO box D) Galvanometer

9)The mag of photoelectric current depends on _______ of light
A)speed B) Frequency C) Wavelength D) Intensity
10)Two photons traveling in the same direction ,the relative velocity of one with respect to the other is :
A) infinity B)0 C)c D)c^2
I think it is c but plz confirm

11)In parallel combination ,of three resistences ,the current divides into
A)two parts B)three parts C) four parts D)five parts
I think it is three parts but plz confirm

12)Two parallel conductor A and B carrying currents 2A and 7 A in same direction respectively ,then force on each conductor will be :

A)both exerts same force
B)A exerts more force than B
C)B exerts more than A
D)do not exert any force on each other

I think it is option. D but I am still confused in it so plz confirm
13)The diameter of a 2 m copper wire is gradually increased from one end to other .The resistivity :

A)of the thick end is greater
B)of the thin End is greater
C) of both the ends are equal
D)varies gradually with diameter

I think it is C but plz confirm .
14)The temperature of one end A of metallic rod is 32F while that of the other end B is 273 K ,heat will flow
A)From A to B
B)From B to A
C)first from B to A and then from A to B
D) neither from A to B nor from B to A
15). total energy of the election (or atom )become more negative as the election closer to the nucleus because

A) election gains P.E. as it is pulled closer to nucleus
B) Election loses P.E . as it is pulled closer to nucleus
C)the total energy is zero
D) election neither gains nor loses P.E.

I think it is option B but plz confirm

16)Tyroid Cancer is carried by the radiation of :
A)Cobalt 60 B)Carbon 12 C)Iodine 131 D)Nickel 63

17)Two current carrying conductors placed parallel to each other then
A)they attract each other for the same direction of current
B)they attract each other for opposite direction of current
C)They repel each other for the same direction if current
D)no force is present between them

18)A charge 'q' is placed stationary in a region where both electric and magnetic field .The net force experience by charge is :
A)electric force B) magnetic force
C)zero D)Both electric and magnetic force

19)If the permeability of a material is Uo" and it's relative permeability is "Ur",then
A)Uo=U.Ur B)Uo=U+Uo
C) U=Ur D)U=UoUr
20)this quantity remains unchanged in transformer
A)Voltage B) Current C) Frequency
D)Charge
21)Which radioactive element is used for radiotherapy
A)iodine 131 B)Thallium (TI)201
C)Fluorine 18 D)Cobalt 60
22)The motional emf developed in a conductor depends on :
A)mass B) Orientation C) diameter D)Area
I think it is C but plz confirm

23)The equivalent resistance of an ameter is :

A)RgRs/Rg-Rs B)Rg+Rs C)RgRs/Rg-Rs
D)Rg +Rs/RgRs

24)the state whose life is 10^-8x10^-5sec is called
A)excited state B)ground state C)Meta state D)none of these

21)X Ray's give the phenomena of :
A)interference B) Diffraction C) polarization D)All of them

I think it is Deffraction but plz confirm

Mcqs

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