**Q: The C.G. of a right circular cone lies on its axis of symmetry at a height of**

**(a) :**h/2

**(b) :**h/3

**(c) :**h/4

**(d) :**h/5

**(e) :**h/6

*h/4*Explanation:

**Q: μ is coefficient of friction. A wheeled vehicle travelling on a circular level track will slip and overturn simultaneously if the ratio of its wheel distance to the height of its centroid, is**

**(a) :**μ

**(b) :**2μ

**(c) :**3μ

**(d) :**0.5U

**(e) :**None of these

*2μ*Explanation:

**Q: A bullet weighing 200 g is fired horizontally with a velocity of 25 m/sec from a gun carried on a carriage which together with the gun weighs 100 kg. The velocity of recoil of the gun, will be**

**(a) :**0.01m/sec

**(b) :**0.05m/sec

**(c) :**1m/sec

**(d) :**1.5m/sec

**(e) :**None of these

*.05 m/sec*Explanation:

**Q: One end of a light string 4 m in length is fixed to a point on a smooth wall and the other end fastened to a point on the surface of a smooth sphere of diameter 2.25 m and of weight 100 kg. The tension in the string is**

**(a) :**17.5 kg

**(b) :**19.5 kg

**(c) :**22.5 kg

**(d) :**25 kg.

**(e) :**None of these

*22.5 kg*Explanation: