Physics Important Question Answer Download PDF:भौतिकी 2 फरवरी क्वेश्चन पेपर यहाँ से देखें
Physics Important Question Answer Download PDF
हेलो दोस्तों आज आप सभी को फिजिक्स का अर्थात भौतिकी का कुछ महत्वपूर्ण ऑब्जेक्टिव और सब्जेक्टिव क्वेश्चन देने वाले हैं जो कि आपके परीक्षा में सीधे पूछा जाएगा मैथ अर्थात गणित का भी पेपर बहुत अच्छा गया आशा करते हैं कि आपका भी बहुत अच्छा गया होगा दोस्तों बहुत ही विज्ञान का क्वेश्चन पेपर साथ ही साथ उत्तर सब्जेक्ट इकोलॉजिस्टिक्स दोनों क्वेश्चन का इस आर्टिकल में दिया गया है इस आर्टिकल को आप सभी अच्छे तरीके से अंत तक जरूर पढ़ें।
(B)1.6×10⁻¹⁹
(C) 2.99×10⁹
(D) -1.6×10⁻¹⁹
Ans:- (A)
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Q.2. Permittivity of free space is
(A) 9×10⁹ mF⁻¹
(B) 1.6×10⁻¹⁹C
(C) 8.85×10⁻¹²Fm⁻¹
(D) 8.85×10⁻⁹Fm⁻¹
Ans:- (C)
Q.3. The unit of electric field intensity is
(A) NC (Newton Coloumb)
(B) NC⁻¹ (Newton/Coloumb)
(C) Vm (Volt m)
(D) CN⁻¹ (Coloumb/Newton)
Ans:- (B)
Q.4. 1 Statcoulomb equals….coulomb.
A.3×10⁹
B.3×10⁻⁹
C.1/3×10⁹
D.1/3×10⁻⁹
Ans:- (D)
Q.5.The number of electrons that should be removed from an uncharged body to have a charge of one coloumb is
A.6.25×10¹⁸
B.6.25×10⁸
C.6.023×10²³
D.None of these
Ans:- (A)
Q.6. Electrostatic field is
(A) conservative
(B) non-conservative
(C) somewhere conservative and somewhere non-conservative
(D) None of these
Ans:- (A)
Q.7. Charges A and B attract each other. Charges B and C attract each other. Then A and C.
(A) will attract each other
(B) repel each other
(C) will not effect each other
(D) A , B and C
Ans:- (D)
Q.8. 1 Coulomb charge is equal to
A.3×10⁹ e.s.u.
B.9×10⁹ e.s.u.
C.8.85×10⁻¹² e.s.u.
D.None of these
Ans:- (A)
Q.9. The charge on a body is written as Q=ne whose e=1.6×10⁻¹⁹ C. The value n will be
A.0,1,2,3….
B.0, ±1, ±2, ±3 , ….
C.0,-1,-2,-3,…
D.None of these
Ans:- (B)
Q.10.Force between two charged particles situated at a distance is r. If distance between the two is made half, then the value of electric force will be
(A) 4 F
(B) 2 F
(C) 1/4 F
(D) 1/2
Ans:- (A)
Q.11. Coloumbian force is
(A) Central force
(B) Electric force
(C) Both a and b
(D) None of these
Ans:- (C)
Q.12. The charge on any substance can not be less than
(A) 1.6×10⁻¹⁹C
(B) 3.2×10⁻¹⁹C
(C) 4.8×10⁻¹⁹
(D) 1C
Ans:- (A)
Q.13. When a body is charged ,its mass
(A) Increases
(B) Decreases
(C) Remains same
(D) May increase or decrease
Ans:- (D)
Q.14. The dimensional formula of electric field intensity is
(A) [MLT⁻²A⁻¹]
(B) [MLT⁻³A⁻¹]
(C)ML²T⁻³A⁻²]
(D) [ML²T²A²]
Ans:- (B)
Q.15. Which of the laws gives the force between two charges at rest ?
(A) Gauss theorem
(B) Kirchhoff’s rules
(C) Coulomb’s law
(D) Faraday’s laws
Ans:- (C)
Q.16. The value of 1/4πε₀ is
(A) 9×10⁹ Nm²C⁻²
(B) 8.85×10⁻¹² Nm²C⁻²
(C) 9×10⁻⁹ Nm²C⁻²
(D) zero
Ans:- (B)
Q.17. There are two identical spheres A and B. A is given +Q charge and B is given -Q charge
(A) Mass of A increases
(B) Mass of B increases
(C) No effect on Mass
(D) None
Ans:- (B)
Q.18. The S.I. unit of electric flux is
(A) Weber
(B) Nm²C⁻¹
(C) Newton/m
(D) m²/s
Ans:- (B)
Q.19. The total charge on a electric dipole is
(A) Zero
(B) Negative
(C) Positive
(D) Infinite
Ans:- (A)
Q.20. The electric field intensity at infinite distance from an electric charge is
(A) Infinite
(B) Zero
(C) 9×10⁹V/m
(D) None of these
Ans:- (B)
Q.21. Unit of surface density of charge is
(A) Coulomb/meter²
(B) Newton meter⁻¹
(C) Coulomb Volt⁻¹
(D) Coulomb meter
Ans:- (A)
Q.22. The electric field at a point near an infinite thin sheet of charged conductor is
(A) ∈₀σ
(B) σ/∈₀
(C) σ/2∈₀
(D) σ∈₀/2
Ans:- (C)
Q.23. A surface encloses an electric dipole. The total electric flux over the surface is
(A) Infinite
(B) Zero
(C) q/∈₀
(D) None of these
Ans:- (B)
Q.24. When a soap bubble is charged, its radius
(A) Increases
(B) Decreases
(C) Remains the same
(D) Becomes zero
Ans:- (A)
Q.25. The electric field intensity inside a hollow spherical charged conductor is
(A) Infinite
(B) Zero
(C) Positive and greater than 1
(D) None
Ans:- (B)
Q.26. When a body becomes negatively charged, its mass
(A) Decreases
(B) Increases
(C) Remains the same
(D) None of these
Ans:- (B)
Q.27. The value of electric field inside a charged spherical conductor is
(A) σ/∈₀
(B) zero
(C) ∈₀σ
(D) σ²/∈₀
Ans:- (B)
Q.28. Minimum number of capacitors of 2μF each required to obtain a capacitance of 5μF will be
(A) 4
(B) 3
(C) 5
(D) 6
Ans:- (A)
Q.29. Surface charge density of a conductor is σ. Electric field near it is
(A) σ/2∈₀
(B) σ/∈₀
(C) 2σ/∈₀
(D) σ/3∈₀
Ans:- (B)
Q.30. Force of attraction between the plates of a parallel plate capacitor is
(A) -q²/2∈₀Ak
(B) q³/2∈₀A
(C) q/∈₀Ak
(D) q²/2∈₀A²k
Ans:- (A)
Q.1. What is the importance of radial magnetic field in a moving coil gqlvanometer ?
Ans – 1. The plane of the coil remains parallel to the direction of magnetic field. So, the galvanometer is linear.
2. it is a stronger magnetic field as compared to the magnetic field produced by theflat pieces of a field magnet.
Q.2. Write two differences between electromagnet and permanent magnet.
Ans- The difference between electromagnet and permanent magnet.
Electromagnet:-
1. It is shows temporary magnetism.It produces the magnetic field as long as currents flows in its coil.
2. The polarity of a electromagnetic can be changed by reversing the direction of the current.
Permanent magnet:-
1. It shows permanent magnetism that is it retain magnetism in it even when the current is swiched off.
2. The polarity of a permanent magnet cannot be changed.