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Mdcat-past-papers - UHS Quiz

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441. The induced current will flow in a direction so as to oppose the cause that produces it is statement of:



442. In an AC generator the emf will be maximum when factor sin ωt is equal to:



443. In an ideal transformer:



444. Output voltage of rectifier is not smooth; it can be made smooth by a circuit known as:



445. What happens in positive cycle of AC input?



446. In case of half wave rectification the resistance of diode during negative half of A.C is:



447. The direction of current through the load resistance of a full wave rectification circuit:



448. For the positive half cycle i.e. 0 → T/2, the diode D:



449. The conversion of A.C into D.C is called rectification and circuit is called rectifier. Which component of electronics acts as a rectifier?



450. Full wave rectification is given by:



451. A diode characteristic curve is a plot between:



452. Calculate the half-life of bismuth-214 which has a decay constant of 4.3 x 10^-1.



453. Calculate the activity decaying atom per unit time of radioactive strontium-90 having 6.7 x 10^21 atoms at t=0. Decay constant of strontium-90 is 8.3 x 10^-10 s^-1.



454. In relation λT1/2 = 0.693, which quantity is represented by λ?



455. The half-life of Strontium (Sr) is 8.7 hours. Its decay constant is:



456. The decay rate of radioactive substance is:



457. An artificial radioactive element can be made by bombarding:



458. If we have "No" number of any radioactive element then after a period of "n" half lives the number of atoms left behind is:



459. The unit of decay constant is;



460. Heavy nuclei of atoms go through fission so that they can:



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