If light ray is reflected from the denser medium, the path difference produced in the reflected ray will be :

(1) λ/4

(2) λ/2

(3) λ

(4) zero

A block of mass m is connected to another block of mass M by a spring (massless) of spring constant k. The block are kept on a smooth horizontal plane. Initially the blocks are at rest and the spring is unstretched. Then a constant force F starts acting on the block of mass M to pull it. Find the force of the block of mass m.

1) MF /(m + M) 
2) mF / M
3) (M+m )F / m 
4) mF /(m + M)

IIn a series L−C−R circuit, current in the circuit is 11A when the applied voltage is 220V. Voltage across the capacitor is 200V. If value of resistor 20Ω, then the voltage across the unknown inductor is

1) Zero
2) 200V
3) 20V
4) None of these

Equal potentials are applied on an iron and a copper wire of same length. In order to have the same current flow in the two wires, the ratio r(iron) / r(copper) of their radii must be: [specific resistance of iron = 1.0 ]

1) 2.4 : 1
2) 1 : 2.4
3) 1.2 : 1
4) 1 : 1.2

The electric field in a region of space is given by E^→ = E_oî + 2E_oj^ E where Eo=100N/C. The flux of this field through a circular surface of radius 0.02 m parallel to the Y-Z plane is nearly :

1) 0.125Nm²/C
2) 0.02Nm²/C
3)  0.005Nm²/C
4) 3.14Nm²/C

.If the escape velocity of a rocket from the surface of the Earth is ve , then the escape velocity of the same rocket from the surface of a planet whose acceleration due to gravity as well as radius are 3 times that of the Earth is
 
 1) v_e
 2) v_e / 3
 3) 3 v_e
 4) 9 v_e

In Young's double slit experiment,the angular position of a point on the central maxima whose intensity is one fourth of maximum intensity

1) sin⁻¹(λ/d)    
2) sin⁻¹(λ/2d)  
3) sin⁻¹(λ/3d)    
4) sin⁻¹(λ/4d)

A projectile is fired into the air and 12.6 seconds later hits the ground. With what speed was the projectile fired into the air?
 1) 97.5 m/s
 2) 14.6 m/s
 3) 61.7 m/s
 4) 38.6 m/s

A thin prism P₁ with angle 4o4o and made from glass of refractive index is 1.54 is combined with another thin prism P2 made from glass of refractive index 1.72 to produce dispersion without deviation. The angle of the prism P₂ is:

1) 5.33^o
2) 3^o
3) 4^o
4) 2.6^o 

A plane electromagnetic wave of frequency $$25\ MHz$$ travels in free space along the x-direction. At a particular point in space and time, $$\vec { E } =6.3\hat { j } { V }/{ m }$$. What is $$\vec {B}$$ at this point?

1) 4.1×10−8k
2) 2.1×10⁻⁸k
3) 0.21×10⁻⁸k
4) 20.1×10⁻⁸k