wbjee 2013 Question paper

Q. 1 – Q. 45 carry one mark each, for which only one option is correct. Any wrong answer will be lead to deduction of 1/3 mark.

1.  a এবং b প্রত্যেকটির মান 1 এবং 2 হওয়ার সম্ভাবনা সমান । ax² + bx + 1 = 0 সমীকরণের বীজদ্বয় বাস্তব হওয়ার সম্ভাবনা হল

(A) [tex]{1 \over 2}[/tex]      (B) [tex]{1 \over 4}[/tex]      (C) [tex]{1 \over 8}[/tex]      (D) [tex] {1 \over {16}}[/tex]

1.  X যৌগটির IUPAC নামটি হল -

(A) 4-সায়ানো-4-মিথাইল-2-অক্সোপেন্টেন

(B) 2-সায়ানো-2-মিথাইল-4-অক্সোপেন্টেন

Q. 1 – Q. 45 carry one mark each, for which only one option is correct. Any wrong answer will lead to deduction of 1/3 mark.

1.   In diborane, the number of electrons that account for bonding in the bridges is

Q. 1 – Q. 45 carry one mark each, for which only one option is correct. Any wrong answer will be lead to deduction of 1/3 mark.

1.  A point P lies on the circle [tex]x^2+y^2=169[/tex]. If Q = (5, 12) and R = (-12, 5), then the angle [tex]\angle QPR[/tex] is

(A) [tex]\frac{\pi}{6}[/tex]       (B) [tex]\frac{\pi}{4}[/tex]       (C) [tex]\frac{\pi}{3}[/tex]       (D) [tex]\frac{\pi}{2}[/tex]

Ans: (B)