MCQ
The current conduction in a discharged tube is due to
  • A
    Electrons only
  • B
    +ve ions and electrons
  • C
    - ve ions and electrons
  • + ve ions, $-v e$ ions and electrons

Answer

Correct option: D.
+ ve ions, $-v e$ ions and electrons

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

A man measures the period of a simple pendulum inside a stationary lift and finds it to be $T$ sec. If the lift accelerates upwards with an acceleration $g / 4$, then the period of the pendulum will be
Image
Carbon, silicon and Germanium atoms have four valence electrons each. Their valence and conduction band are separated by energy band gaps represented by $(E) .(E)$ and $(E)$ respectively. Which one of the following relationship is true in their case
Specific rotation of sugar solution is $0.01 Sl$ units. $200 kgm ^{-3}$ of impure sugar solution is taken in a polarimeter tube of length $0.25 m$ and an optical rotation of $0.4 rad$ is observed. The percentage of purity of sugar is the sample is
At the top of the trajectory of a projectile, the acceleration is
A coil of inductance $L$ has an inductive reactance of $X_L$ in an $AC$ circuit in which the effective current is $l$. The coil is made from a super$-$conducting material and has no resistance. The rate at which power is dissipated in the coil is
The mass of the moon is $7.34 \times 10^{22} \mathrm{~kg}$ and the radius is $1.74 \times 10^6 \mathrm{~m}$. The value of gravitation force will be
Three blocks of masses $2 kg , 3 kg$ and $5 kg$ are connected to each other with light string and are then placed on a frictionless surface as shown in the figure. The system is pulled by a force $F=10 N$, then tension $Q_1=$
Image
A source and listener are both moving towards each other with speed $v / 10$, where $v$ is the speed of sound. If the frequency of the note emitted by the source is $f$, the frequency heard by the listener would be nearly
If $\gamma$ denotes the ratio of two specific heats of a gas, the ratio of slopes of adiabatic and isothermal $P V$ curves at their point of intersection is
In extrinsic $P$ and $N$-type, semiconductor materials, the ratio of the impurity atoms to the pure semiconductor atoms is about