# HSEB NEB Model Questions Physics 2076

HSEB NEB Model Questions Physics 2076 is the collection of all the important questions of Physics subject for Class 12. These questions are prepared by the expert teachers of reputed school/colleges. The main objective of HSEB NEB Model Questions Physics 2076 is to provide best questions to prepare their board exam.

## Group  A

### 1. Answer, in brief, any FOUR questions (4×2=8)

a. Which one of the two has greater resistance: a two kilowatt heater or a 100 watt bulb, both marked for 220 V?

b. On which principle is Kirchhoff’s second law depend?

c. What is meant by the retentivity of magnetic material is high?

d. Does the thermoelectric effect obey the law of conservation of energy? explain how.

e. Why is a series LCR circuit called as accepter circuit?

f. As soon as current is switched on in a high voltage wire, the birds sitting on it fly away, why?

### 2. Answer, in brief, any FOUR questions (4×2=8)

a. How does the quantum theory of radiation explain the photoelectric effect?

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b. In the production of X rays, how will you control the penetrating power of it?

c. What is the physical significance of half-life period?

d. What difference is the quark model of a meson and a baryon?

e. Why is an extrinsic semiconductor electrically neutral even if it has a large number of charge carriers, holes or electrons?

f. Why Helium gas is used in He-Ne LASER, however only Neon is responsible to produce the LASER?

### 3. Answer, in brief, any ONE questions (1×2=2)

a. Why don’t we hear the sound of oscillation of second pendulum?

b. Why does the flash of light reach the earth before the sound coming from the same thunder?

### 4. Answer, in brief, any ONE questions (1×2=2)

a. What is the resolving power of our eye?

b. How does light polarize in reflection?

## Group B

### 5. Answer, in brief, any THREE questions (3×4=12)

a. Define shunt of an electric circuit. How do you convert galvanometer into an ammeter? Also find the total resistance of the ammeter.

b. Define Seebeck effect. Explain how thermo-emf varies with temperature of two junctions in a thermocouple.

c. Show that magnetic force per unit length experienced by two straight conductors held parallel at finite distance is same, although the amount of current is different in these wires.

d. An a.c. passes through a circuit containing a resonance and an inductor. Derive an expression for the impedance of the circuit. Also draw the phase diagram.

### 6. Answer, in brief, any THREE questions (3×4=12)

a. Describe the mechanism of discharging phenomena in gases at various pressures.

b. Write main postulates of Bohr’s atom model. Derive the expression for the total energy of an electron of the hydrogen gas.

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c. Define rectifier. Describe the working of full wave rectifier.

d. Write the laws of radioactivity. State and describe the radioactive decay law.

### 7. Answer, in brief, any ONE questions (1×4=4)

a. How velocity of sound and end correction of the resonance tube are determined experimentally?

b. How does the frequency of sound change when sound source is moving

(i) towards the stationary listener and (ii) away from the stationary listener?

### 8. Answer, in brief, any ONE questions (1×4=4)

a. Describe  Michelson’s method of determination of velocity of light.

b. Deduce the conditions of maxima and minima in the Fraunhoffer diffraction method.

## Group C

### 9. Answer, in brief, any TWO numerical questions (2×4=8)

a. A silver wire 2.6 mm in diameter transfers a charge of 420 C in 80 min. Silver contains 5.8 x 1028 electrons per cubic meter. What is the current in the wire? What is the magnitude of the drift velocity of the electrons in the wire?

b. A cast iron sample exhibits a magnetic field of 0.5 T when the magnetic intensity H is 10 Am-1. Find the permeability of the cast iron at this value of H. What would be the field in air at this value of H?

c. The wiring of a refrigerator contains a starter capacitor. A voltage of amplitude 170 V and frequency 60Hz is applied across the capacitor to produce a current amplitude of 0.85 A. What capacitance C is required?

### 10. Answer, in brief, any TWO numerical questions (2×4=8)

a. An electron moves in a circular path of radius 20 cm in a magnetic field of 2 x 10-3 T. What is the speed of the electron? What is the p.d. through which the electron must be accelerated to acquire this speed? (e=1.6 x 10-19 C, m=9.11 x 10-31 kg)

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b. Calculate the de Broglie wavelength of a 5 g moving away from at 340 m/s. Will the bullet exhibit wavelike properties?

c. The galaxy at a distance 6.2 x 106 light years is moving away from the earth with a speed of 86 x 105 m/s. Calculate the age of the universe.

11. An 80 m long brass rod is struck at one end. A person at the other end hears two sounds as a result of two longitudinal waves, one travelling in metal rod and the other travelling in the air. What is the time interval between the two sounds?

(the speed of sound in air is 344 m/s And Young’s modulus of brass=9 x 1010 Nm-2, density of brass 8.6 x 103 kgm-3)

12. In Michelson rotating prism method, the distance between, the rotating prism and the distant mirror is measured to be 45 km. A minimum speed of 416.7 rev/s for the rotation of the prism is needed to view the source in the same position as when the prism is at rest. Calculate the speed of light.

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