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Navratri 2020 date, muhurt, puja timing: Shardiya Navratri from today, know the auspicious time of worship and worship method Navratri (Navratri 2020) starts from Ashwin Shukla Paksha in the autumn and lasts for a full nine days. This time Sharadiya Navaratri starts from 17 October i.e. till 25 October. Vijayadashami or Dussehra will be celebrated on 26 October. Kalash installation has special significance with many customs associated with Navratri. Kalash Sthapana is also known as Ghat Establishment. The beginning of Navratri begins with the establishment of Ghat. Ghat establishment is the call of the goddess of power. Kalash installation auspicious time The most auspicious time of Ghat establishment is after one-third of Pratipada has passed. If for some reason you are not able to install the Kalash at that time, then you can also install it in Abhijeet Muhurta. The eighth Muhurta of each day is called Abhijeet Muhurta. It is 40 minutes long. However, this time Abhijeet Muhurta is no...

Durga Puja in Bengal: Durga Puja is the most important socio-cultural and religious event in the Bengali festival calendar. It is celebrated during the autumn season and is observed for four days, from Saptami to Dashami. The festival is dedicated to the worship of Goddess Durga, who is believed to have defeated the demon Mahishasur. The festival is celebrated not only in West Bengal but also in other regions such as Bihar, Odisha, and Assam, as well as in other states of India where the Bengali community resides. The festival involves worshipping the nine aspects of Durga, pandal hopping, and enjoying food. The festival is also a great social event where people come together to celebrate the victory of good over evil  Durga Puja is one of the most significant and widely celebrated festivals in the Indian state of West Bengal, especially in the capital city, Kolkata. The festival is dedicated to Goddess Durga, the divine mother, and it holds immense cultural, social, and religious ...

TRP Scam: BARC's big action on fake TRP case, ban on news channels' ratings The ratings agency Broadcast Audience Research Council has taken a big decision amidst the uproar over fake TRPs. BARC has currently banned weekly release ratings of news channels. The ban has been temporarily imposed on the ratings of news channels in all languages ​​for 12 weeks. BARC has stated that the current system of measuring TRP data will be reviewed. It will be improved further. Let me tell you that this case of fake TRPs came to the fore when BARC had lodged a complaint through Hans Research Group to the effect that some TV channels were tampering with TRPs. It was alleged that some such families were being bribed to run a particular channel, which had TRP data collecting devices in their homes. The police has arrested at least five people in this case. Those arrested include news channel employees. Apart from this, police are also questioning officials of Republic TV led by Arnab Goswami. At...

10 Question-Answer on electromagnetic spectrum 1.        The wavelength of X-rays is of the order of: (a)     1 metre (b)    1 cm (c)     1 micron (d)    1 angstrom Ans: ( d) 2.        Which of the following is the largest wave? (a)     X-rays (b)    ϒ – rays (c)     Microwaves (d)    Radio waves Ans : (d) 3.        In which of the following, emission of electrons does not take place (a)     Thermionic emission (b)    X-ray emission (c)     Photoelectric emission (d)    Secondary emission Ans: ( b) 4.        Molybedenum is used as a target element for the production of X-xrays because it is (a)     Light and can easily deflect electrons (b)    Light and can ...

10 Question-Answer on displacement current  1.        The displacement current was first postulated by: (a)     Maxwell (b)    Marconi (c)     Ampere (d)    Hertz Ans: ( a) 2.        Which of the following type of radiations are radiated by an oscillating electric charge (a)     Electric (b)    Magnetic (c)     Thermoelectric (d)    Electromagnetic Ans: ( d) 3.        The theory of electromagnetic waves predict-ted by Maxwell in 1888 was confirmed experimentally first by (a)     Maxwell (b)    Hertz (c)     Marconi (d)    J.C. Bose. Ans: ( b) 4.        The electromagnetic waves (a)     Travel with the speed of sound (b)    Travel with the same speed in ...

Example of electromagnetic waves Example 1 :   A parallel plate capacitor with plate area A and separation between the plates d is charged by a constant current I. consider a plane surface of area A/3 parallel to the plates and drawn symmetrically between the plates. Find the displacement current through this area. Solution :   Let Q be the charge on the capacitor at time t. The electric field intensity at a point in between the plates of the capacitor is: E = Q/ϵ 0 A The electric flux through the area considered is ɸ E =(Q/ϵ 0 A)A/3=Q/3 ϵ 0 The displacement current is I D= ϵ 0 ( dɸ E /dt) = ϵ 0 d/dt(Q/3 ϵ 0 ) = ϵ 0 × i/3 ϵ 0 ( dQ/dt)= i/3 Example 2 : find the energy stored in a 120 cm length of a laser beam operating at 6m W. Solution : time taken by laser beam to move through a distance 120 cm is T= 120/c=120/(3 × 10 10 ) = 4 × 10 -9 s The energy contained in the 60 cm length of laser beam is U = P × t=6 m W × (4 × 10 -9 s ) =( 6 × 10 -3   j/s) ...

10 Question-answer on transformer 1.        If the number of turns in primary and secondary coil is increased to two times each, the mutual inductance (a)     Become 4 time (b)    Become 2 time (c)     Become 1/4 time (d)    Remains unchanged. Ans: ( a) 2.        A transformer is used to light 140 W, 24 V lamp from 240 V a.c. mains. The current in the main is 0.7 A. the efficiency of transformer is nearest to (a)     90% (b)    80% (c)     70% (d)    60% Ans: ( b) 3.        In a step down transformer, use of 120 V line, provides a pot. Diff. of 2400 V. if the primary coil has 75 turns, number of turns in secondary coil is: (a)     150 (b)    1500 (c)     1200 (d)    1575 Ans: (b) 4.      ...

10 Question-Answer on alternating current 1.        A voltmeter reads V volt in an A.C. circuit. Then V is: (a)     Peak value of voltage (b)    Peak value of current (c)     R.m.s. value of current (d)    R.m.s. value of voltage. Ans: ( d) 2.        If an alternating current of frequency 50 Hz is flowing through a conducting wire; then how many times does the current become zero in one second? (a)     125 times (b)    100 times (c)     75 times (d)    25 times Ans: (b) 3.        A coil has an inductance of 0.7 henry and is joined in series with a resistance of 220Ω. When an alternating e.m.f. of 220 V at 50 cycles per second, is applied to it, then wattles component of current in the circuit is: (a)     7 A (b)    5 A (c)     0.7 ...