Physics Test - ...

Two parallel wires PQ and ST, placed a distance w apart, are connected by a resistor R as shown in the figure and placed in a magnetic field B which is perpendicular to the plane containing the wires. A rod CD connects the two wires. The power spent to slide the rod CD with a velocity v along the wires is (neglect the resistance of the wires and that of the rod):

The initial mass of a rocket is \(1000 \mathrm{~kg}\). Calculate at what rate the fuel should be burnt, so that the rocket is given an acceleration of \(20 \mathrm{~ms}^{-1}\). The gases come out at a relative speed of \(500 \mathrm{~ms}^{-1}\) with respect to the rocket [Use, \(\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2\) ]

Which of the following statements is true/false?

A. An ion is a charged particle and can be negatively or positively charged. A negatively charged ion is called an anion and a positively charged ion, a cation

B. An ion is a charged particle and can be negative or positively charged. A negatively charged ion is called a cation. And a positively charged ion, an anion.

Two identical metal wires of thermal conductivities \(\mathrm{K}_1\) and \(\mathrm{K}_2\) respectively are connected in series. The effective thermal conductivity of the combination is

The moment of inertia of the hollow sphere and solid sphere is equal then what is the ratio between their radius?

If the kinetic energy of a body is increased nine times then the momentum of the body will be increased by:

What did Archimedes determine after discovering the Archimedes principle?

Human eye ____________.

Four particles each of mass M, move along a circle of radius R under the action of their mutual gravitational attraction as shown in figur. The speed of each particle is