Find the sum of reciprocals of the zeros of x2 + 6x + 2 (a) 3 (b) -3 (c) 12 (d) -12
Answers
Step-by-step explanation:
Friction is a
(a) non-contact force (b) contact force
(c) magnetic force (d) electrostatic force
Answer: (b) contact force
Q 2.Which of the following produces least friction?
(a) Sliding friction (b) Rolling friction
(c) Composite friction (d) Static friction
Answer: (b) Rolling friction
Q 3.Friction always
(a) opposes the motion (b) helps the motion
(c) both (a) and (b) (d) none of these
Answer: (a) opposes the motion
Q4.Friction can be reduced by using
(a) oil (b) grease
(c) powder (d) all of these
Answer: (d) all of these
Q 5.Static friction is less than
(a) sliding friction (b) rolling friction
(c) both (a) and (b) (d) none of these
Answer: (d) none of these
Q 6.Whenever the surfaces in contact tend to