If p: Ashok works hard: q: Ashok gets good grade The verbal form for `(~ p->q)` is
(a) If Ashok works hard then gets good grade
(b) If Ashok does not work hard then he gets good grade
(c) If Ashok does not work hard then he does not get good grade
(d) Ashok works hard if and only if he gets good grade

P: he studies hard, q: he will get good marks. The symbolic form of " If he studies hard then he will get good marks "is_____

p: He is hard working. q: He will win. The symbolic form of "He is hard working then he will win", is

p: I am topper. q: I worked hard. The symbolic form of the statement : "I am topper or I worked hard", formed from statements p,q can be

A multiple - choice question has 5 options of which only one is correct. If a student does home work, then he is sure to identify the correct answer, otherwise the answer is chosen at random. Let A ne the event that the student does his home work and B be the event that the student answers correctly. If P(A)=(2)/(3) , then P((A)/(B)) is euqal to

Avneet buys 9 square paving slabs, each with a side of 1/2 m. He lays them in the form of a square. (a) What is the perimeter of his arrangement [Fig 10.7(i)]? (b) Shari does not like his arrangement. She gets him to lay them out like a cross. What is the perimeter of her arrangement [(Fig 10.7 (ii)]? (c) Which has greater perimeter? (d) Avneet wonders if there is a way of getting an even greater perimeter. Can you find a way of doing this? (The paving slabs must meet along complete edges i.e they cannot be broken.)

Figures (a) and (b) show the field lines of a positive and negative point charge respectively. (a) Give the signs of the potential difference V_(P)-V_(Q), V_(B)-V_(A) . (b) Give the sign of the potential energy difference of a small negative charge between the points Q and P, A and B. (c) Give the sign of the work done by the field in moving a small positive charge from Q to P. (d) Give the sign of the work done by the external agency in moving a small negative charge from B to A. (e) Does the kinetic energy of a small negative charge increase or decrease in going from B to A?