71. The center of gravity of a uniform lamina lies at A. The center of heavy portion B. The bottom surface C. The mid point of its axis D. All of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
72. The center of gravity of a triangle lies at the point of A. Concurrence of the medians B. Intersection of its altitudes C. Intersection of bisector of angles D. Intersection of diagonals Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
73. A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to A. 25 B. 50 C. 100 D. 250 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
74. A particle inside a hollow sphere of radius r, having coefficient of friction $$\frac{1}{{\sqrt 3 }}$$ can rest upto height of A. $$\frac{{\text{r}}}{4}$$ B. $$\frac{{\text{r}}}{8}$$ C. $$0.134{\text{ r}}$$ D. $$\frac{{3{\text{r}}}}{8}$$ Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
75. The center of percussion of the homogeneous rod of length L suspended at the top will be A. $$\frac{{\text{L}}}{2}$$ B. $$\frac{{\text{L}}}{3}$$ C. $$\frac{{3{\text{L}}}}{4}$$ D. $$\frac{{2{\text{L}}}}{3}$$ Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
76. The necessary condition for forces to be in equilibrium is that these should be A. Coplanar B. Meet at one point C. Both (A) and (B) above D. All be equal Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
77. The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be A. $$\frac{{\text{r}}}{2}$$ B. $$\frac{{2{\text{r}}}}{3}$$ C. $$\frac{{\text{r}}}{{\text{A}}}$$ D. $$\frac{{3{\text{r}}}}{2}$$ Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
78. Dynamic friction as compared to static friction is A. Same B. More C. Less D. May be less of more depending on nature of surfaces and velocity Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
79. Which of the following do not have identical dimensions? A. Momentum and impulse B. Torque and energy C. Torque and work D. Moment of a force and angular momentum Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
80. The co-efficient of friction depends upon A. Nature of surfaces B. Area of contact C. Shape of the surfaces D. All of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
