Physics Test-3...

An object is said to be in uniform motion in a straight line if its displacement:

The energy of electron in the ground state of hydrogen atom is \(−13.6~ eV\). The energy required for the transition from n = 2 to n = 3 will be

Electroplating prevents:

\(2 \mathrm{Ag}^{+}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s}) \rightleftharpoons \mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{Ag}(\mathrm{s})\)

The standard potential \(\mathrm{E}^{\circ}\) for this reaction is \(0.46 \mathrm{~V}\). Which change will increase the potential the most?

Which of the following statements are correct acording to Biot – Savart’s law?

(i) According to Biot – Savart’s law magnetic field is directly proportional to the length of the element.

(ii) Biot – Savart’s law deals with electric field.

(iii) Magnetic field is directly proportional to current through the conductor.

What is the direction of the angular velocity vector for an object rotating counter clockwise?

Which of the following conditions is used to determine the stable equilibrium of all partially submerged floating bodies?

An electrolyte is:

The current in the rectangular loop of area \(A\) is I. If this loop is placed in the uniform magnetic field of intensity \(B\) and the angle between the magnetic field and the area is \(\theta\), then how much torque on loop will be?

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):