Question 9] what is the disadvantages of half wave rectifier?
Answer: - 1] The current passing through the transformer is unidirectional; hence there is possibility of
core saturation. To avoid this we have to increase size of a transformer.
2] Ripple fac

Question 10] A soap of radius 10 cm is blown. Surface tension of soap solution is 20 dyne/cm. Calculate
the work done in blowing the bubble.
Data: r = 10 cm
T = 20dyne/cm
Solution: soap bubble has two surfaces, one outer and the other inner.
Total new sur

Question 8 ] What is the properties of ferromagnetic substance ?
Answer: - 1] These materials when placed in an external uniform magnetic field, get strongly magnetized
in the direction of the external magnetic field.
2] These materials when placed in an

Question 1] what is the statement formula for Newtons law of gravitation?
Answer: - Newtons law of gravitation states that, Every particle of matter attract every other particle of
matter with a force which is directly proportional product of their masses

Question 4] what is the advantages of bridge rectifier?
Answer: - 1] Bridge rectifier requires small transformer instead of centre tapped used on full-wave
rectifier. This reduces cost of the bridge rectifier.
2] This circuit is most suitable for high vol

Question 3] Define the term Transformer, Rectifier & Filter?
Answer: - Transformer-It is a device which convert input a.c.voltage into desired a.c voltage.It may be
step up or step down to the electronic devices and circuit requiring a.c. power. It also p

Question 2] Calculate the binding energy of an artificial satellite of mass 2000 kg orbiting at height of
1800 Km above the earths surface. Also find the kinetic energy, potential energy and total energy of the
satellite. (R=6400 km, M = 6 * 1024 kg, G =

Question 6] Calculate the kinetic energy of Hydrogen in 1 litre of volume, at a pressure of 1 atmosphere.
Answer: - Solution:
k.E. =3/2 PV
=3/2*1.013*105*10-3
=1.5195*102
=151.91 J

Question 7] A capacitor carries a charge of 5 uc at a potential 400 V. How much electrostatics energy is
stored in condenser?
Answer:- Data: Q= 5 uc=5*10^-6 C
V=500 V
Electrostatic energy stored in condenser, U =?
U = *5 * 10-6* 4* 102
U= 10*10-4 J

Question5] what is the application of resonance?
Answer:-1] By using principle of resonance, unknown frequency of vibrating tuning fork can be
determined.
2] Radio receiver can be tunned to a desired frequency by using principle of resonance.
3] To increa