NEET 2023 PAPER

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NEET 2023 PAPER

( PART 1 )

1. The work functions of Cesium (Cs), Potassium (K) and Sodium (Na) are 2.14 eV, 2.30 eV and 2.75 eV respectively. If incident electromagnetic radiation has an incident energy of 2.20 eV, which of these photosensitive surfaces may emit photoelectrons

 Both Na and K

 K only

 Na only

 Cs only

2. The net magnetic flux through any closed surface is :

 Positive

 Zero

 Infinity

 Negative

3. If the galvanometer G does not show any deflection in the circuit shown, the value of R is given by :

 50 Ω

 100 Ω

 200 Ω

 400 Ω

4. 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

 3.7 A

 0.27 A

 2.7 A

 0.37 A

5. 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

 Load resistance

  Capacitor

 P-n junction diodes

 A centre-tapped transformer

6. In a plane electromagnetic wave travelling in fire space, the electric field component oscillates sinusoidally at a frequency of 2.0×10^10 Hz and amplitude 48 Vm^-1. Then the amplitude of oscillating magnetic field is: ( Speed of light in free space is = 3 × 10^8 ms^-1 )

 1.6 × 10^-9 T

 1.6 × 10^-8 T

 1.6 × 10^-6 T

 1.6 × 10^-7 T

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