A rod of length L is hinged from one end. It is brought to a horizontal position and released. The angular velocity of the rod, when it is in vertical position is

 

1.  

2.  

3.  

4.  

 

A weight w is suspended from the midpoint of a rope, whose ends are at the same level. In other to make the rope perfectly horizontal, the force applied to each of its ends must be

 

A particle moves along a curve of unknown shape but magnitude of force F is constant and always acts along tangent to the curve. Then,

 

1.  F may be conservative
2.  F must be conservative
3.  F may be non-conservative
4.  F must be non-conservative

A block has been placed on an inclined plane with the slope angle θ, block slide down the plane at constant speed. The coefficient of kinetic friction is equal to

 

A charge q is located at the centre of a cube. The electric flux through any face is

 

1.  

During SHM, a particle has displacement x from mean position. If acceleration. Kinetic energy and excess potential energy are represented by a K and U respectively, then choose the appropriate graph

1.  

The root mean square velocity of hydrogen molecule at 27 ° C is and that of oxygen at 402 ° C is , then

 

1.  

A charged spherical conductor of radius a and charge q, is surrounded by another charged concentric sphere of radius b (b > a) . The potential difference between conductors is V. When, the spherical conductor of radius b is discharged completely, then the potential difference between conductor will be

 

1.  V

The current-voltage graph for a device is shown in figure. The resistance is negative in region. 

Silver and copper voltmeters are connected in parallel with a battery of emf 12 V. In 30 min 1 g of silver and 1.8 g of copper are liberated. The energy supplied by the battery is