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Q1. Two identical charged spheres... Dielectric constant K of the liquid is:
(1) ρ / (ρ−σ)
(2) (ρ−σ) / ρ
(3) ρ / (ρ+σ)
(4) (ρ+σ) / p
Q2. Four electric point charges +q,+q,−q and −q at corners of square side 2L. Electric potential at point A midway between +q and +q is:
(1) 1/4πε₀ · 2q/L (1 + 1/√5)
(2) 1/4πε₀ · 2q/L (1 − 1/√5)
(3) Zero
(4) 1/4πε₀ · 2q/L (1 + √5)
Q3. Three resistances P, Q, R each of 2Ω and unknown resistance S form Wheatstone bridge. When 6Ω connected in parallel to S, bridge balances. Value of S is:
(1) 2 Ω
(2) 3 Ω
(3) 6 Ω
(4) 1 Ω
Q4. The induced emf can be produced in a coil by — Choose the correct answer: (A) Moving coil with uniform speed inside magnetic field (B) Moving coil with non uniform speed inside uniform magnetic field (C) Rotating coil inside uniform magnetic field (D) Changing area of coil inside uniform magnetic field
(1) B and D only
(2) B and C only
(3) A and C only
(4) C and D only
Q5. The frequencies of X-rays, γ-rays and ultraviolet rays are respectively p, q and r, then:
(1) p > q, q > r
(2) p < q, q > r
(3) p < q, q < r
(4) p > q, q < r
Q6. Two plane mirrors are inclined at 60° to each other. If an object is placed in between them, the number of images will be:
(1) 5
(2) 8
(3) 6
(4) 9
Q7. An object is placed 30 cm away from a convex lens of focal length 10 cm, sharp image formed on screen. A concave lens is placed in contact with convex lens. Screen moved by 45 cm for sharp image. Focal length of concave lens (in cm) is:
(1) 72
(2) 60
(3) 36
(4) 20
Q8. In Young's double slit experiment, intensity of each slit is I₀. Minimum separation between two points on screen where intensities are 2I₀ and I₀ (fringe width = α) is:
(1) α/4
(2) α/3
(3) α/12
(4) α/8
