In the Young’s double slit experiment both the slits are similar. If the length of one of the slits is halved, which of the following is true? (a) Bright fringes become narrower. (b) Bright fringes become wider. (c) Dark fringes become darker (d) Dark fringes become brighter.

Instead of using two slits as in Young’s experiment, if we use two separate but identical sodium lamps, which of the following occur? (a) general illumination. (b) widely separate interference. (c) very bright maximum. (d) very dark minimum.

Magnetic field lines form continuous closed loops a) magnet is always a dipole b) magnet is always a monopole c) magnetic material is permeable d) none of the above

Ratio of intensities of two waves are given by 4 :1. Then the ratio of the amplitudes of the two waves. (a) 2 : 1 (b) 1 : 2 (c) 4 : 1 (d) 1 : 4

The dimensional representation of \(ε_0\) will be A. [\(MLT^2\)\(A^2\)] B. [\(M^{-1}\) \(L^{-3}\) \(T^4\) \(A^2\)] C. [\(ML^{-2}\)\(T^2\) \(A^{-2}\)] D. none of these

The direction of magnetic dipole moment is always from a) North pole to south pole b)Away from North pole outside magnet c) South pole to North Pole d) all of the above

The figure below shows a 2.0 V potentiometer used for the determination of internal resistance of a 1.5 V cell. The balance point of the cell in open circuit is 76.3 cm. When a resistor of 9.5 Ω is used in the external circuit of the cell, the balance point shifts to 64.8 cm length of the potentiometer wire. Determine the internal resistance of the cell. (a) 1.7 Ω (b) 2.7 Ω (c) 3.7 Ω (d) 1.1 Ω

The figure below shows a potentiometer with a cell of 2.0 V and internal resistance 0.40 Ω maintaining a potential drop across the resistor wire AB. A standard cell which maintains a constant emf of 1.04 V (for very moderate currents up to a few mA) gives a balance point at 67.3 cm length of the wire. To ensure very low currents drawn from the standard cell, a very high resistance of 600 KΩ is put in series with it, which is shorted close to the balance point. The standard cell is then replaced by a cell of unknown emf Ꜫ and the balance point, found similarly, turns out to be at 82.3 cm length of the wire. What is the value Ꜫ? (a) 0.25 V (b) 2.25 V (c) 3.25 V (d) 1.25 V

The following figure shows the top view of a rod that can slide without friction. The resistance is 5.0Ω and a 2.5 T magnetic field is directed perpendicularly downwards into the paper. Length of the rod is 1.0 m.

The given figure shows tracks of three charged particles in a uniform electrostatic field. Which of them is probably an α-particle? (A) 1 (B) 2 (C) 3 (D) None of the above

The magnetic flux linked with a coil is given by the equation Ø = 2t² + 2t + 4 weber. The magnitude of induced emf at time t=2s will be (a) 16 V (b) 10V (c) 12V (d) 8V

The ratio of magnetic length to geometric length of a magnet is a) 0.084 b) 8.4 c) 80.4 d) 0.84

Two-point charges 2μC and 4μC are placed 2 cm apart. The ratio of the Coulomb’s force experienced by them is (A) 1: 2 (B) 2: 1 (C) 1: 1 (D) 4: 1

In the figure the net electric flux through the area... when the system is in air. On immersing the system in water,the net electric flux through the area

15 joule of work has to be done against an existing electric field to take charge of 0.01C from A to B . Then potential difference ( \(V_B\) –\(V_A\))is 1. 1500 volts 2. -1500 V 3 .0.15 Volt 4 .15 Volt