+2 (Subjective)
Mock Test – 3
Time 2 hour
M.M. -70
Section – A
10 Question of 1 marks each
Q1. Which rule gives you the direction of torque?
Q2. What is the difference between electromotive force and terminal voltage of a cell? How are they
related with each other.
Q3. Where is the vertical component of earth’s magnetic field zero?
Q4. A small d.c. motor operates at 110 V d.c. What is back e.m.f. When its efficiency is maximum?
Q5. Arrange the following radiations in the descending order of frequency: - rays, infra- red rays,
microwaves, yellow light, ultraviolet rays.
Q6. What is the ratio of speed of IR rays and UV rays in vacuum?
Q7. A source of light is placed at a distance of 1m. from a photocell and the cut off potential is found to
be . If the distance is doubled what will be the cut off potential?
Q8. Express 1 a.m.u. in kg.
Q9. Give the Boolean expression for NOR gate.
Q10. Which of the two – AM or FM is preferred for high fidelity reception?
Section – B
8 Question of marks 2 each
Q11. Two point charges of +2 C and + 6 C repel each other with a force of 12 N. If each is given an
additional charge of -4 C, what will be the new force?
Q12. Prove that in series combination of electrical appliances, the reciprocal of total power consumption
is equal to the sum of the reciprocal of the powers of the individual appliances.
Q13. In what ways electric and magnetic fields are different?
Q14. A lamp is connected in series with a capacitor. Predict your observations for dc and ac connections.
What happens in each case if capacitance of the capacitor is reduced?
Q15. What is intensity of electromagnetic wave? Give its relation in terms of electric field E and
magnetic field B.
Q16. What are anastigmatic lenses?
Q17. An increase in the intensity of the incident light does not change the maximum velocity of the
emitted photo – electron. Why?
Q18. Compare the gravitational force and Coulomb’s force between two charged nucleons (say protons).
Section – C
8 Question of 3 marks each
Q19. The input resistance, in the common emitter amplifier circuit of a given transistor, has a value of
1.5 k Ω. The output of this circuit, is obtained across a collector resistance of 7.5 k Ω. What would
be the output voltage corresponding to an input voltage of 5 mV, if the current amplification factor,
of this transistor has a value of 60?
Q20. A T.V. tower has a height of 150 m. How much population is covered by the T.V. broadcast if the
average population density around the tower is 1000 k? Radius of the earth is 6.4 m.
Q21. The electric field in a certain region of space is
an area of (2 - ) .
N/C. Calculate electric flux due to this field over
Q22. Find the magnitude of the current supplied by the battery in the circuit shown in Fig. Also, find the
potential difference between the points A and B.
Q23. A toroid has 2000 turns. The inner & outer radii of its core are 11 cm and 12 cm respectively. The
magnetic field in the core for a current of 0.7 A is 2.5 T. What is relative permeability of core?
Q24. What is the magnetic flux through each turn of a solenoid of self inductance 8.0 H, when a current
of 3.0 A flows through it? Assume that the solenoid has 1000 turns and is wound from wire of
diameter 1.0 mm. What is the cross sectional area of the solenoid?
Q25. Calculate the frequency of a photon whose energy is 50 eV. Given, h = 6.63 Js and e =1.6 C.
Q26. A T.V. tower has a height of 150 m. How much population is covered by the T.V. broadcast if the
average population density around the tower is 1000 ? Radius of the earth is 6.4 m.
Section – D
4 Question of 5 marks each
Q27. Derive an expression for fringe width in interference pattern?
Or
Experimental setup, observation and conclusion of Davison – Germer experiment.
Q28. Draw circuit arrangement for CB (Common Base), CE (Common Emitter) and CC (Common
Collector) configuration.
Or
Explain propagation of Electromagnetic Waves i.e.
a) Ground Wave Propagation
b) Sky Wave Propagation
c) Space Wave propagation.
Q29. a) Prove for resistors in series = +
b) Prove for resistors in parallel = + .
Or
Find magnitude and phase of current in R –L- C series circuit when sine voltage is applied across
it.
Q30. Characteristics / Facts of em waves?
Or
Find between two infinite conductor carrying currents