Important question for class 12th physics

( Important question for class 12th physics )

Question (1)— Define potentiometer and explain its principal ?

Question (2)— What is lenz's law. How it can be used to determine the direction of induced current?

Question (3)— Explain Kirchhoff's law ?

Question (4)— Write principal of Wheatstone bridge ?

Question (5)— Write law of reflection ?

Question (6)— Derive Biot-Savart law ?

Question (7)— Explain the following
(i) Blue colour of sky
(ii) Red colour of sun during sunrise and Sunset

Question (8)— Write the reason for twinkling of stars?

Question (9)— By drawing the energy level diagram, show the spectral lines of Lyman, Balmer and paschen series of hydrogen spectrum ?

Question (10)— Write the difference between electric and magnetic force ?

Question (11)— Differentiate between potentiometer and voltmeter ?

Question (12)— What is electromagnetic induction and Write Faraday law of electromagnetic induction ?

Question (13)— How Galvanometer is converted into Ammeter. Explain it ?

Question (14)— How Galvanometer is converted into voltmeter ?

Question (15)— Describe Rutherford's atomic model. Give reasons why did it fail.

Question (16)— State the postulates of BohrsB atomic model ?

Question (17)— What is meant by logic gates ? What are OR and AND gates ? Draw their symbol and electrical equivalent circuit ?

Question (18)— Describe wan-de-graff generator order the following points (i) principal (ii) Labbele diagram (iii) Construction (iv) working (v) uses

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NIAMEY, Dec 13 (AFP) The Islamic state group has claimed responsibility for an attack on an Army camp in Niger which left 71 military personnel dead, the SITE Intelligence group said on Thursday. Hundreds of jihadists attacked the camp, near the border with Mali with shells and mortars on Tuesday, killed 71, injuring 122 and leaving other missing' according to the Defence Ministry. The attack in Inates in the western Tillaberi region was the deadliest on Nigers military since Islamist militant violence began to spill over from neighbouring Mali in 2015. "The Islamic States West Africa Province (ISWAP) claimed credit for the deadly raid on the Inates military base in Niger, "SITE, which monitors jihadist media, said.

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