2nd year Physics Important MCQs

1. The number of electrons in one coulomb charge is equal to

a) 6.2×10¹⁸ Eloctrons
b) Zero Electorns
c) 1.6×10^-22 Electorns
d) 6.2×10²¹ Electorns

Answer

a)6.2×10¹⁸ Eloctrons

2. The photo copying process is called

a) Xerography
b) Inkjet Printer
c) printing
d) photoediting

Answer

a) Xerography

3. Electric intensity due to an infinite sheet of charge is

a) ∂/2ε∘
b) ∂/rε∘
c) ∂/r2ε∘
d) none of these

Answer

c) ∂/r2ε∘

4. Electric flux is a:

a) Scalar quantity
b) Vector quantity
c) Vector quantity
d) All of these

Answer

a) Scalar quantity

5. Electric potential at a distance ”r” from ”q” is

a) V_r= 1/54πε∘q/r₂
b) V_r= 1/4πε_o²q/r₂
c) V_r= 1/4πε_o2q/r d) V_r= 1/4πε_oq²/r

Answer

c) V_r= 1/4πε_o2q/r

6. The relative permitivity of air is

a) 79.9
b) 1.006
c) 1.06
d) 1.0006

Answer

c) 1.06

7. The “toner” of photocopier is given:

a) Positive charge
b) Negative charge
c) Remains neutral
d) All of above

Answer

b) Negative charge

8. The electric intensity at infinite distance from the point charge is

a) infinte
b) zero
c) Positive
d) Negative

Answer

b) zero

9. Who introduced the concept of electric field

a) Coulomb
b) Newton
c) Faraday
d) Millikan

Answer

c) Faraday

10. Net charge enclosed by Gaussian surface is:

a) zero
b) maximum
c) depend on intensity
d) Depend upon size of shape

Answer

a) zero

11. Maximum power output is

a) I²R
b) VI
c) E/2R
d) E² /4r

Answer

d) E² /4r

12. The algebraic sum of potential changes for a closed loop is

a) Kirchhoff’s 1st law
b) Kirchhoff’s 2nd law
c) Joule’s Law
d) Fleming’s Rule

Answer

b) Kirchhoff’s 2nd law

13. Internal resistance is the resistance offered by

a) Source of emf
b) The conductor
c) The resister
d) The Circuit

Answer

a) Source of emf

14. The wire of resistance 3.0 Ω is stretched to twice its original length. The resistance of the new wire will be

a) 1.5 Ω
b) 6.0 Ω
c) 12 Ω
d) 3.0 Ω

Answer

b) 6.0 Ω

15. Electrolytes conduct charges due to

a) protons
b) electrons
c) holes
d) ions

Answer

d) ions

16. The unit of electromotive force is

a) Newton
b) Pascal
c) Ampere
d) Volt

Answer

d) Volt

17. Drift velocity of electrons is

a) 10^-1m/s
b) 10^-2m/s
c) m^-3/s
d) m^-4/s

Answer

c) m^-3/s

18. Which of the following is non Ohmic device

a) Inductor
b) Diode
c) Capacitor
d) None of these

Answer

b) Diode

19. Specific resistance of materials depend upon

a) Length
b) Area
c) Density
d) Temperature

Answer

d) Temperature

20. For a closed circuit

a) E = V_t
b) E > V_t
c) E = V_t-Ir

Answer

b) E > V_t

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