Moving Charges and Magnetism — Physics STD 12 Science — Question

Assertion  :   If different gases are filled turn by turn at the same pressure in the discharge tube the discharge in them takes place at the same potential.
Reason      : The discharge depends only on the pressure of discharge tube and not on the ionisation potential of gas.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.

Liquids and gases never exhibit:

Which of the following is NOT a postulate of Bohr's model of the hydrogen atom? 

The carrier frequency generated by a tank circuit containing 1 nF capacitor and 10 mH inductor is(a) 1592 Hz(b) 1592 MHz(c) 1592 kHz(d) 159.2 Hz

Einstein got Nobel prize on which of the following works(a) Mass-energy relation(b) Special theory of relativity(c) Photoelectric equation(d)  (a) and (b) both

When a resistance of 2ohm is connected across the terminals of a cell, the current is 0.5 amperes. When the resistance is increased to 5 ohm, the current is 0.25 amperes. The internal resistance of the cell is(a) 0.5 ohm (b) 1.0 ohm(c) 1.5 ohm (d) 2.0 ohm

An object is placed at a distance of 20 cm from a convex lens of focal length 10 cm. The image is formed on the other side of the lens at a distance (a) 20 cm (b) 10 cm(c) 40 cm (d) 30 cm

In which of the following ionic bond is present(a) NaCl(b) Ar(c) Si (d) Ge

An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of 4/3 and 2/3, then the ratio of the currents passing through the wire will be(a) 3 (b) 1/3(c) 8/9(d) 2