= 1 – 2 = – 1 equation = x2 – sx + p = 0 = x2 – 2x – 1 = 0 If force is always perpendicular to motion : (A) Kinetic energy remains constant (B) Work done is zero (C) Speed is constant (D*) All are correct
3.
The alkaline earth metal hydroxide which is amphoteric in character is : (A*) Be(OH)2. (B) Ca(OH)2. (C) Sr(OH)2. (D) Ba(OH)2.
4.
Pacemaker is situated in which part of human heart : (A*) In the wall of right atrium (B) On interventricular septum (C) On interventricular interventricular septum (D) In the wall of left atrium