Physics Test - 1

Resistances n each of r ohm, when connected in parallel combination, give an equivalent resistance of R. If these resistances are connected in series, then the new combination would have a resistance equal to

A bullet of mass m is fired into a block of wood of mass M which hangs on the end of a pendulum and gets embedded in it. When the bullet strikes the wooden block, the pendulum starts to swing with a maximum rise R. The velocity of the bullet is given by

The power factor of LCR circuit at resonance is

Which of the following is a correct statement?

Equivalent energy of mass equal to 1 a.m.u. is

If the radii of circular paths of two particles of same masses are in the ratio of 1:2, then to have a constant centripetal force their velocities should be in the ratio of

A nibble is equal to

A charged particle accelerated through a potential difference of 100V passes through the uniform electric and magnetic fields so as to experience no deflection. E = 15 x 10⁶ V / m and B = 5 x 10³ T. The specific charge e/m is

A wheel having metal spokes of 1m long between its axle and rim is rotating in a magnetic field of flux density 5 x 10⁻⁵ T normal to the plane of the wheel. An e.m.f of 22/7 m V is produced between the rim and the axle of the wheel. The rate of rotation of the wheel in radians per second is

The ratio of the lengths of two wires A and B of same material is 1:2 and the ratio of their diameter is 2:1. They are stretched by the same force, then the ratio of increase in length will be