Question
Cathode rays consist of(a) Photons(b) Electrons(c) Protons(d) α -particles
       

Answer

(b) 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

Two parallel wires are carrying electric currents of equal magnitude and in the same direction. They exert(a) An attractive force on each other(b) A repulsive force on each other(c) No force on each other(d) A rotational torque on each other
   
   
Which of the following is used to investigate the structure of solids?
The relative permeability is represented by $m_r$ and the susceptibility is denoted by $c$ for a magnetic substance. Then for a paramagnetic substance
What is the coefficient of mutual inductance when the magnetic flux changes by $2 \times 10^{-2}\ Wb$ and change in current is $0.01 A$
Two equally charged, identical metal spheres A and B repel each other with a force 'F'. The spheres are kept fixed with a distance 'r' between them. A third identical, but uncharged sphere C is brought in contact with A and then placed at the mid-point of the line joining A and B. The magnitude of the net electric force on C is (a) F(b) 3F/4(c) F/2     (d) F/4
       
The electric field inside a conductor.
A bulb rated at $(100 \mathrm{W}-200 \mathrm{V})$ is used on a $100 \ce{V}$ line. The current in the bulb is
Assertion  :   Electric lines of force cross each other.
Reason      : Electric field at a point superimpose to give one resultant electric field.(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 assertion is false but reason is true.
 
 
 
 
Peltier co$-$efficient of a thermo couple is $2$ nano volts. How much heat is developed at a junction if $2.5 \ \text{amp}$ current flows for $2$ minute
An electric lamp is marked 60 W, 230 V. The cost of a 1 kWh of energy is Rs. 1.25. The cost of using this lamp 8 hrs a day for 30 day is(a) Rs. 10 (b) Rs. 16(c) Rs. 18 (d) Rs. 20