The transformation ratio in he step-up transformer is

The cyclotron frequency of an electron grating in a magnetic feild of 1 T is approximately

A mass m is moving with a constant velocity along a line parallel to x-axis. Its angular momentum with respect to origin on z-axis is

The length, breadth and thickness of a bloc are given by l=12 cm, b=6 cm,and t=2.45 cm.
The volume of the block according to he idea of significant  figure should be

10000 small ball ,each weighing 1 g, strike one square centimetre  of area per second with a velocity 100 m/s in a normal direction and rebound with the same velocity. The value of pressure on the same velocity. The value of pressure on the surface will be

The optical path of a monochromatic light is came if it goes through 4.0 cm if glass of 4.5 cm of water . It the refractive index  of glass is 1.53, the refractive index if the water is

In a second pendulum ,mass of bob is 30g. If it is replaced by 90 g mass ,then its time period will be

In the absence of intermolecular force of attraction, the observed pressure p will be

A and B are two radioactive substances whose half-lives are 1 and 2 years respectively. Initially 1 g of A and 1 g of B  is taken. The time (approximate) after which they will have same quantity remaining is

A current carrying small loop behaves like a small magnet. If A be its area and M its magnetic moment ,the current in the loop will be