In Boolean expression, if every OR(+) is changed to AND(.) and all 1's to 0's and vice versa, the Boolean expression so obtained: (i)still remains true (ii)changes (tick the correct option)

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if assertion is true, but reason if false, (D) if both assertion and reason are false Assertion : A transformer can be used to increase/ decrease both voltage and the current. Reason : In a transformer, e_p I_p = e_sI_s and accordingly, if we gain in voltage, we lose in current and vice-versa.

A constant force acting on a body of mass 3.0 kg changes its speed from 2.0 m s^-1 to 3.5 m s^-1 in 25 s. The direction of the motion of the body remains unchanged. What is the magnitude and direction of the force ?

Let n_1, and n_2 , be the number of red and black balls, respectively, in box I. Let n_3 and n_4 ,be the number one red and b of red and black balls, respectively, in box II. A ball is drawn at random from box 1 and transferred to box II. If the probability of drawing a red ball from box I, after this transfer, is 1/3 then the correct option(s) with the possible values of n_1 and n_2 , is(are)

Define magnetic field. Write an expression for force on a charge q moving with velocity vecv in a region having uniform magnetic field strength vecB . How does the speed change as the charge moves? Under what circumstances the force vecF will be zero and maximum? also obtain S.I. unit of the strength of magnetic field. Also give dimensional formula of B.

Let n_1 and n_2 be the number of red and black balls respectively, in box I. Let n_3 and n_4 be the number of red and black ball respctively, in box II.: One of the two boxes , box I andbox II, was selected at random and a ball was drawn randomly out of this box. The ball was found to be red. If the probability that this red ball was drawn from box II is 1/3 , then the correct option(s) with the possible values of n_1, n_2, n_3 and n_4 is (are):

In a p-n junction diode, the current I can be expressed as I = I_0 (exp ((eV)/(2k_BT))-1) where I_0 is called the reverse saturation current, V is the voltage across the diode and is positive for forward bias and negative for reverse bias, and I is the current through the diode, k_B is th Boltzmann constant (8.6xx 10^-5 eV/K) and T is the absolute temperature. If for a given diode I_0 = 5 xx 10^ -12 A and T = 300 K, then - What will be the current if reverse bias voltage changes from 1 V to 2 V?

In a square matrix A of order 3 the elements a_(ii) 's are the sum of the roots of the equation x^(2) - (a+b) x + ab =0, a_(i,i+1) 's are the product of the roots, a_(i,i-1) 's are all unity and the rest of the elements are all zero. The value of the det (A) is equal to