NEET-UG 2023 · Code E1

Let a wire be suspended from the ceiling (rigid support) and stretched by a weight W attached at its free end. The longitudinal stress at any point of cross-sectional area A of the wire is :

1. A2W/A
2. BW/A
3. CW/2A
4. DZero

The ratio of radius of gyration of a solid sphere of mass M and radius R about its own axis to the radius of gyration of the thin hollow sphere of same mass and radius about its axis is :

1. A3 : 5
2. B5 : 3
3. C2 : 5
4. D5 : 2

A football player is moving southward and suddenly turns eastward with the same speed to avoid an opponent. The force that acts on the player while turning is :

1. Aalong eastward
2. Balong northward
3. Calong north-east
4. Dalong south-west

If ∮ₛ E⃗ · dS⃗ = 0 over a surface, then :

1. Athe number of flux lines entering the surface must be equal to the number of flux lines leaving it.
2. Bthe magnitude of electric field on the surface is constant.
3. Call the charges must necessarily be inside the surface.
4. Dthe electric field inside the surface is necessarily uniform.

The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 cm, potential energy stored in it will be :

1. A2U
2. B4U
3. C8U
4. D16U

A 12 V, 60 W lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of 220 V. Assuming the transformer to be ideal, what is the current in the primary winding?

1. A0.27 A
2. B2.7 A
3. C3.7 A
4. D0.37 A

A full wave rectifier circuit consists of two p-n junction diodes, a centre-tapped transformer, capacitor and a load resistance. Which of these components remove the ac ripple from the rectified output?

1. AA centre-tapped transformer
2. Bp-n junction diodes
3. CCapacitor
4. DLoad resistance

Light travels a distance x in time t₁ in air and 10x in time t₂ in another denser medium. What is the critical angle for this medium?

1. Asin⁻¹(t₂/t₁)
2. Bsin⁻¹(10t₂/t₁)
3. Csin⁻¹(t₁/10t₂)
4. Dsin⁻¹(10t₁/t₂)